Shop Best Rj45 Rj11 Cable Tester in NOYAFA

Shop Best Rj45 Rj11 Cable Tester in NOYAFA

2021-10-21
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How to Select a Good Cable Fault Tester
How to Select a Good Cable Fault Tester
In recent years, cables have been widely used in various industries. More and more equipment are used to detect cable faults, and their types and models are increasing. At present, there are a variety of instrument types and instrument names in the domestic cable fault detection instrument market. In addition to the common cable fault testers in China, they also appear in the market one after another. So, how to choose so many cable fault detection equipment? 1、 When you choose a cable fault tester, you need to know its own quality, such as whether its parts are compact and whether its whole shell is solid. These aspects can let you know what the cable fault tester you choose is, whether it has very solid quality and whether it has very strict production process, To determine whether it's worth your choice. But then again, the manufacturers still have a good guarantee for all aspects of the cable fault tester produced by themselves. Although the process is rigorous and other aspects are outstanding, it can indeed have a good test effect in testing the problems of the power system of the power grid. 2、 When choosing the cable fault tester, we should also understand its operation performance and simplicity, whether the performance is stable and whether it will be disturbed by electromagnetic field. These aspects also determine whether the cable fault tester we choose has very accurate test data, whether the operation is simple and whether it takes a long time.
Why You Want a Cable Length Testers
Why You Want a Cable Length Testers
Today there are many different manufacturers and types of network cable testers on the market. Standard testers are used by those who want to check the quality of their cables. Bridge cables are a one-piece technology and are often used by certification testers as they can perform a greater variety of tests and there are short training videos on how to use them.Professional network testers are used in commercial environments and by certified professional cable installers at work. Professional testers have more skills when it comes to troubleshooting cables while maintaining a high level of accuracy. As an added bonus, professional testers allow you to track and archive your test results for future references.Some verification tools contain additional features such as a Time Domain Reflectometer (TDR) to determine the length of the cable and the distance between interruptions and short circuits. Some test tools do not provide information about bandwidth or suitability for high-speed data communication.There are many different types of network testers on the market today. LinkIQ cable network testers are easy to use, as explains Eric Webb, Fluke Network Product Manager in the video below. It shows how the settings can be used to perform a cable test with a network cable tester, save the results and upload them to link ware where they are available.To help you find the best network or cable tester for your use, I have compiled a list of test products that work well. The most obvious difference between a generic or standard tester and a professional tester is the brand cost, where professional network testers are more expensive than other testers.I came across the Elegiant Network Cable Tester while working on establishing a LAN connection for a local company. With my extensive experience as an electrician, I can say that this is the best tool for testing cable connections.Selecting, selecting and purchasing a suitable network cable tester can be a complicated and challenging task. However, there are some essential factors that consumers should consider when purchasing a good network cable tester and absolutely should consider, as they can make or break the tester you are buying.For example, suppose you are looking for a good Ethernet cable tester or Ethernet cable speed tester. Network cable testers are sensitive products that are exposed to various extreme elements, suggesting that you should get a tester with a long warranty. In this case, you should look at the reviews of the Ethernet cable testers from previous buyers, who can confirm the star rating of the products.These three basic tests are performed in accordance with the EIA standards for twisted pair cables, wire mapping and cable length for high-speed performance. Check that the signal is strong and fast enough to meet network performance requirements. If you are testing the cable length with a calibrated capacitive tester it is better to test with a time domain reflector tester, as it can measure the distance to the location where the error is displayed.Make sure that the two ends of the cable you want to test are not connected to a TV, cable distributor, or any other related device. Find the right cable and touch the cable to one or the other so that a beep is generated. Connect one end of the coaxial cable tester to the wall plate on your coaxial cable wall and point the other end to the tester so that the entire cable can be assembled.This situation is indistinguishable from a real insulation break when the triggering current is exceeded. As the length of the cable increases, its capacity is limited by the rise time. The shorter the rise time, the higher the voltage, and the larger the DV / DT, the greater the amount of current required to charge the cable (parasitic capacity). Increasing the wire resistance of a longer cable helps to slow the charging current but requires a minimum dwell time of 10 s to ensure that the full cable length is reached before the test voltage is performed (leak measurements).Dirty contacts, bad bruising, cable damage and poor quality can provide strange and wonderful reading results. In order to reach the test voltage without damaging the traction current, it should be taken care to adjust the voltage ramp to the length of the cable so that it slows down. Cami Research ramp tester has a ramp which can be adjusted from 150 V / s to 5,000 V / s.The flagship cable tester VDV-II Pro uses a TDR to measure cable length and provide distance and error information. A TDR works by injecting a signal into the cable and measuring the time the signal reflects an impedance change caused by a short circuit.Standard testers are manual, while professional testers work automatically. Automatic testers allow you to apply contrasting IA- and ISO-testing methods and highlight many individual tests to verify conformity.The PocketHornet comes standard with a limited warranty of 1-2 years, depending on the region. Customers in the EU receive a 2-year warranty, while others only receive a 1-year warranty. It is not a cable certification device, but conducts cable qualification and verification.There are various types of cables on the market, but the most popular and widely used cable for modern technology is the coaxial cable. This article describes how to test a coaxial cable signal with a multimeter in situations where the transmitter does not work well. We may receive a small commission if you purchase a product through our selected links but the price of the product remains the same.In a house with a wired network connected to the TV, the cable coming from the family room should connect to a cable modem or router upstairs. There are 2 cables in the family rooms, the one marked "upstairs" is connected to the office upstairs and the other "downstairs" to the basement.
Cable Tracker Mapping Software
Cable Tracker Mapping Software
Cable Tracker is one of the most famous AI writing assistants. It is available for Windows and macOS. Cable Analyzer is available for Mac OS X.Cable Tracker comes with a built-in programming language, which allows developers to generate proper professional content through cable tracker. For example, it can be used to create informational articles on social media accounts or to explain the benefits of cable internet bundles over other types of internet services (i.e., satellite or fibre). Cable Analyzer can also give a report on technical issues around cable television services (cable modems, etc.).We all know that a cable company is a big part of our daily lives. It's a fact that we depend on them for almost everything. But what do you do if the company's website doesn't inform you about the prices? What price will you pay for getting connected to your cable provider? How much will it cost you for more channels? Where can I get all these information at once?You can use cable trackers to monitor your home business. You can view multiple meters at once. You can also see the data on a per-room basis.With the help of these tools, the cable company can give a more detailed overview of their customers' data.In a world with increasing data available on the internet, more and more companies are realizing that their cable streams can be tracked by third parties. This has created a great opportunity for them to sell their services to cable customers.The IPTV providers in the US have been exposed of selling their content through cable channels and paying huge amounts of fees to these third parties. The IPTV industry is growing rapidly in the U.S., which provides an attractive opportunity for these companies to sell premium viewing rights as well as create business models.Ultibox - a tool to help you find the best cable TV available in your region.This article explains how to use cable trackers and analyzers.In the short time that it has been in the market, cable TV apps have become a staple part of many households. But, with so many app options available, it seems that there is a lack of one-stop shopping.Cable Tracker provides an overview of current television and cable offers in a user friendly and interactive interface. Cable Analyzer allows you to get details about what channels are being viewed at any given moment using predictive analytics. App scheduler will let you set your schedule for watching the most popular shows and keep all of your favorite channels on hand at all times.For years, there were only two cable tracking devices available - the HubSpot and Adobe Pulse. Their prices were over $100 each.The problem with these devices was that they didn't have all features that were needed to run a successful cable plan. It had limited functionality and it required a lot of effort to set up.Cable Tracker helps you to make informed decision on whether or not you should invest in the latest technology for your home business. This app provides more than just cable plans: It also helps you to make informed decisions on network, internet service providers and other important aspects of home business services.The use of cable tracker software in the cable industry is expanding. There are several companies that make these applications for home users to track their TV and internet usage. These applications provide a way for the user to monitor how much time they spend watching TV or surfing the internet, how much time they save and other interesting statistics.New tools have been created to help you watch your cable service. One of them, called Cable Tracker, is a network traffic monitor that will detect sudden spikes in data usage and display the bandwidth used by your internet provider.The applications of the Cable Tracker are varied and have many different uses. The applications of the Cable Analyzer are widely used in telecommunications, cable television, and cable systems. The third application is cable tracker (also known as a subscriber list provider), which allows you to manage your customer’s account information conveniently from your computer or smartphone.The objective of this article is to give some insight into three of the most popular applications that can be found today: Cable Tracker, Cable Analyzer, and Cable Scheduler.
Brief Introduction of Cable Identification Instrument
Brief Introduction of Cable Identification Instrument
The working principle of the cable identification instrument needs to add a special signal to the identified cable, which should be received by a special receiver. Using this characteristic, the cable to be found can be identified. The cable identification instrument works according to the following principles: the cable identification instrument consists of a signal generator, a receiving clamp signal detector and an indicator. The signal generator mainly generates special pulse modulation signals, which are added to the stopped tested cable through the output line. The receiving clamp is used to find the tested cable on site. When the receiving clamp detector detects the special signal applied to the cable, The electric meter pointer on the signal detector swings synchronously with the frequency of the applied signal, while the signals detected on other cable lines are much smaller and in the opposite direction. It is easy to determine the tested cable by indicating the amplitude and direction of the electric meter. When the receiving clamp signal detector is used in combination with the signal generator, it can be used to distinguish the charged state of the cable, or assist in finding the short circuit position of the cable. When receiving clamp signal detector is used, clamp the cable with clamp. Dear customers: Hello, our company is a high-quality development group with strong technical force, providing users with high-quality products, complete solutions and superior technical services. The enterprise adheres to the tenet of building a business in good faith, keeping the business with quality and developing the business with enterprising. It continues to climb new peaks with a firmer pace and make contributions to the national automation industry. New and old customers are welcome to buy their favorite products at ease. We will serve you wholeheartedly!
Model Prototyping and OXO Electric Screwdriver
Model Prototyping and OXO Electric Screwdriver
This project is part of a UX Prototyping class that involves weekly prototyping challenge.ChallengeCreate a two model prototypes of an electric screw driver for OXO. First create a quick and rough cardboard model to visualize the placement of controls and functionality. The second prototype will be higher fidelity with a strong focus on ergonomics.The electric screw drivers must have the following variable speed control mechanism/interaction for changing between speeds screw-driver selection mechanism allows you to automatically select and switch between either Phillips or flathead shape and five different sizes of each shape. direction selection mechanism (non-digital) to either screw in or unscrew digital readout (monochromatic, non-touch sensitive) Displays number of screws screwed and screws unscrewed for tracking your progress as a handyman/handywoman. can be used right or left-handed product dimensions are a minimum of 6 inches long 2.5 inch x 2.5 inch battery with charge port attached product weight is between 11.5 poundsResearchBefore ideating, I researched the OXO company brand and their products. OXO is known for their signature non-slip and comfortable handles. They are advocates for universal and easy to use products for everyone.Looking closely at the product handles they have similar round rubber handles that are sized appropriately to the average grip. The paddle and plow handles in Figure 1 are good example of OXOs comfortable handles. The plow has curves that leverage a persons thrust. I took inspirations from these designs into the model prototypes handles. Design: 1st ModelThe priority of the screwdriver was the comfort of the grip, so I focused on the handle first and then designed the rest of the screw driver around it. I used a similar angled handle on the screw driver like the plow above. This angled handle fit the natural angle of the human hand. In this position users could comfortably hold the screw head level and apply weight without straining the wrist. Influenced by the OXOs ease of use I placed the majority of the functionality near the handle. I placed scroll wheels to change the speed and direction of the drill within comfortable reach of the thumb. The digital read out is also close the grip. I added a reset button for the read out right below the screen. Lastly, I used a screw-driver selection mechanism that can be changed by first pulling out the head of the screw driver and the twisting it to a different size and shape. Feedback: 1st ModelAfter completing the first model I received critique from two peers. I specifically asked for feedback on three criterions: comfort, ease of use, and ease of access to controls. The table below summarizes their feedback. This feedback guided redesigns for the second model.Design: 2nd ModelTo address the negative feedback I focused on fixing three things- Longer handle with added weight and better grip- Curved elbow between handle and base- Clear instructions for changing screw driver size and shapeBefore I drafted these changes, I visited the art store to look for materials that would give me freedom to form the grip well. I then drafted a redesigned screwdriver that addressed the feedback. I spent most of the time forming the foam that made up the grip and controls on the elbow. I then added clay to give the grip better shape and add weight to it. I used foam stickers and markings to emphasize buttons and functions of the screwdriver. ModelPrototype. mp4Edit descriptiondrive. google. comFeedback: 1st ModelAn in class critique session helped evaluate the usability and comfort of the screwdriver. I got good reviews from most of my class mates with suggestions on small design choices.IN/OUT for digital read out isnt as clear as Screwed/UnscrewedThe screw-driver selection mechanism is confusing. The large red arrow misleading because it is on the part of the screwdriver that doesnt moveThe prototype is balanced but too light to get a good sense of how it would be usedLessons LearnedI enjoyed the challenge making these two models out of random materials and learning a few lessons in process.Iterating and testing provides valuable feedback and a better product.Weight is important for testing how the real prototype would feelEveryone has different bodies so it is important to test ergonomics with many people. RELATED QUESTION Why are courier packaging bags so popular? Courier packaging bags also known as tamper proof courier bags or security bags are the packaging material of choice for a variety of reasons. A few of the most important reasons for their popularity is : Versatility - These bags work for almost every kind of industry, since they can be fabricated to any size required - big or small. Environment Proof - These bags are made of plastic and hence are protected from environmental factors such as dirt , moisture , dust, water etc. Easy to Use - All you have to do is place the item inside and close the bag, no advance machinery required :) Tamper proof features - These bags have mechanisms in built into the bag that help detect any kind of tampering or pilferage during transit. Easy to brand - These bags can be branded in low quantities and customised courier bags have become the staple for every eCommerce startup looking to scale quickly. Budget Friendly - Probable the biggest reason for their popularity. These bags are available for a very budget friendly price, that is a big lure for companies looking to improve their bottom line. I hope this quick list helps :)
Best High Voltage Detector Tester Reviews in 2021
Best High Voltage Detector Tester Reviews in 2021
A voltage detector is a power tool that tests the electric field presence of an electrical circuit. A voltage sensor is capable of detecting 12-1000V AC and can detect the voltage of electrical appliances, cables, switches, cables, lights, wires, sockets and circuit breakers. It is also able to detect the voltage of irrigation systems, doorbells, low voltage flashes and thermostats.The Sperry voltage tester is a durable, portable, lightweight and easy-to-use voltage sensor, which can detect AC voltages from 1.2 V to 1,000 V. Our love of the Greenlee Commercial Electric Voltage Tester is that it includes helpful design elements such as acoustic and visual clues that there is electricity in the output, such as the sound of the voice and additional echo sounder alarms. The Klein Tool ET40 voltage testers are ideal for checking regular electrical wiring, door bell sockets, lights and others.Due to the simple design described above, it is easy to use Klein Tools NCVT-3 voltage tester. The Fluke 1AC-II Non-Contact Voltage Meter has a red tip and a beep that sounds when voltage is detected. To use this non-contact voltage tester, all you need to do is touch the tip of the non-contact voltage meter to the wire on the outlet and then place it in a small slot on the front panel.If a voltage is detected, an LED lights up at the top and the circuit is interrupted. When electromagnetic waves come from a source and the voltage hits the tip of the ballpoint pen, the non-contact voltage tester reacts by sending a signal to the circuit, which activates a light and a sound to inform the user that a power cable has been tested. The FLK2AC can detect voltages from 90 to 1,000 volts, it lights up red and a beep indicates that it has detected voltage.The FLK2AC is powered by two AAA batteries and has an automatic shutdown to avoid draining the batteries. The NCVT 3P comes with a flashlight, which the NCVT 2P lacked, so I decided to replace the 2P with an NCVT 6 that uses a laser to determine the exact distance to the voltage source. I have also included the Neoteck Professional Non-Contact option as a low-end option and the Bside X1As as a high-end option.If you need a high-quality outdoor voltage tester, the waterproof IP67 housing of the Southwire mid-range non-contact voltage tester is appreciated. A voltage detector or LED tester not only provides maximum safety, but also removes the limitations of the type of voltage devices that can be tested. Not only is it the most reliable model in its price range but it is also equipped with new Voltbeat technology which enables self-testing, so that when something goes wrong, the problem can be detected by the sensor itself or by another device such as a nearby voltmeter or oscilloscope.This voltage detector with LED tester has a wide detection range from 1.2 to 1000V AC and is able to test the voltage of household appliances. In addition to detecting standard and low voltages, it can also identify nominal voltages. The quality voltage pin operates in a wide voltage range and gives visual and acoustic feedback when a voltage is detected.All these aspects must be taken into account when selecting the best voltage tester for daily use. Our ratings of the best voltages to test will help you choose the best one for your needs.Buy one from a trusted manufacturer if you are looking for a tool that will be part of your toolbox for years to come. You will want the best and you will be eager to find a lasting one. You can fix failed assets with the first tool you put your hands on.If you are looking for a non-contact tester with an outstanding feature, this will be your ideal choice. It has an auto function that automatically determines whether the device has been used in the last few minutes. My colleagues praised this product and the reviews reflect the satisfaction of the product buyers.Milwaukee is at the forefront of innovation, producing innovative products that help solve everyday problems, such as the 2203-20 voltage tester. This multimeter switches between AC and DC current to test resistance and amperage. As a trusted manufacturer in the power tool industry, specializing in the manufacture of electrical tools for professionals, their products are top notch, and many professionals have been using the meters they buy for decades.
Function of Cable Fault Locator
Function of Cable Fault Locator
The function of cable fault locator is in the power industry and some industries using cables, especially in some complex power systems. It is very difficult to find the fault of underground cable lines. However, in this regard, the continuous emergence of equipment with various functions and simple operation can not only reduce the high cost of fault detection, but also reduce the inevitable long-time power failure when difficult to find (cable fault locator) cable fault, which brings a lot of convenience to troubleshooting. Direct buried cable fault detection in underground direct buried cable and underground residential power distribution (URD) system is a very time-consuming thing, and will cause very inconvenient power failure to users. Some technologies may also damage the cable. For some equipment with high technical requirements, its operation is more complex, and only operators with strict training can use it, which brings a lot of inconvenience to the popularization and application of this kind of technical equipment. Therefore, the selection of appropriate technology depends partly on the knowledge of cable system design understood by the designer of fault detector, and also partly on the professional and technical knowledge of equipment and operators in this regard. With appropriate equipment and professional technology working on site, it is the first step to detect faults quickly and effectively. Hammering (pulse) method many power companies use hammering (pulse) method. This technique is effective in detecting high resistance faults in a simple (cable fault locator) cable system. The hammering method includes using a pulse or impulse voltage to impact the power cut cable. When an effective high voltage pulse strikes the fault area, the fault point flashover and produces a hammering sound that can be heard by the operator along the cable surface. However, detecting cable faults often requires several hammers, and repeated shocks may damage the cable. Dear customers: the company also has underground cable fault tester, cable fault tester, mining cable fault tester and other products. You can call the company's service phone through the web page to learn more product details. Perfect and beautiful service is our pursuit. New and old customers are welcome to buy their favorite products at ease. We will serve you wholeheartedly!
Basement  Businesses
Basement Businesses
So, you want to be your own boss. And you figure a business in your basement is a good way to set up something to be a boss of. Trouble is, you'll probably end up with more bosses than you ever had - every customer who gets you on the phone.Don't worry. Your own business has other benefits, and you'll get to remember a whole lot of them every April, when you find out how much of your money you're keeping out of the tax collector's hands.Your small business doesn't have to be in the basement, of course, but that location often gives people the biggest tax writeoff, says chartered accountant Sheldon Buchalter. If your home is a bungalow with a big full basement, you may well be able to claim half of many of the costs of your house. Buchalter shudders at the number of self-employed people who don't know they can claim the cost of a home office, or forget about it from one April to the next."I see it all the time," he says. "I had one guy who had been missing a tax deduction of five grand a year for the last four years. That's close to 10 grand he shouldn't have paid the government."Buchalter himself has an office in his home as well as his cheerfully cluttered, fountain-bedecked place of business at Tepperman Buchalter LLP. He doesn't try to claim the expenses at home, though."You know what they say. Pigs get fat. Hogs get slaughtered," he says. "I'm not using the office at home every day. I use it maybe 10, 15 times a year. It has to be regular, continuous use to be claimed. It's intended for when you have no other office or place to do business."What Buchalter does do, though, is claim for the mountains of clients' files he stores in his basement."If I rented a storage space, it would probably cost $300 a month. Instead, our company pays me $75 a month."The situation can be much more clear cut if your home office is the only place you have to do business. You may not, in that case, even have to set aside a room in the house that's used for nothing but business, although you're much safer with the tax collector if you do. Either way, you need to figure out how much of the expenses for your entire home could reasonably apply to the business.The Canada Revenue Agency prefers that you get a tape measure out of your tool drawer, but Buchalter will have none of that.He usually tells his clients to figure things out on the basis of one floor, say, in a three-floor house, or one room out of however many you have, not counting bathrooms or closets, no matter how big they are. So what's eligible? "You can claim your cleaning lady," Buchalter chortles, "or at least a part of her."Other claimable expenses are more obvious. They include mortgage interest (but not the part of the payments that goes toward the principal owing), property taxes, heat, hydro, water and home insurance. "Don't forget cutting the grass and shovelling the snow," Buchalter says. "You have to make the place attractive for the clients." Repairs and renovations come into the picture, too, but they're a tougher call in terms of what to claim, and tax advisers and collectors may have differing opinions on what's legitimate and what's not."I tell my clients not to claim any portion of general house repairs," Buchalter says. He points to a new roof as an example. Sure, your office won't be much good to you if the rain is as bad inside as out, but then the house won't be habitable either, and won't be worth anything when you go to sell it.Similarly, don't claim the cost of a major renovation - tearing down and putting up walls, and the like - to create your home office.Besides, that kind of work could easily cost $20,000 or more, and that's not the kind of money you can claim as an expense in any one year. Meanwhile, the courts have been pushing the tax collector into a kinder corner in recent years when it comes to expense claims for home offices."You can have a bit of personal use in a home office these days, and CRA still says okay," Buchalter says. "That's a big change in recent years."Buchalter doesn't like to go too far with the tax rules."I tell people they can't use their living rooms or dining rooms as a home office," he says. "But a bedroom or a den is okay."Getting back to the computer in your home office, if you bought the machine since March 2007, you can write off 55 per cent of the cost in the first year, with the rest to follow in later years. That's up from only 30 per cent to start - and may get a little closer to the speed with which computers collapse into the category of obsolete and worthless.All the deductions you do take, though, can add up, so it's not surprising that the tax collector has thrown a wrench into the works. You have to make enough of a profit on your business to cover the home-office expenses, or you don't get to claim them in the current year.The tax collector is giving you more latitude with your other expenses, producing a loss in your business even when you have a "day job" and are using the business loss to reduce the tax you owe on your regular employment income.Whether you're in a home office or an outside office, however, the Canada Revenue Agency may take exception to the kind of business you run and whether you're allowed to claim expenses against your revenue at all."It's the hobby issue," Buchalter says. If you start a mortgage lending business, even the tax collector isn't likely to accuse you of having so much fun that you shouldn't be allowed to deduct expenses. But if you love collecting stamps, and then decide to go into the business of buying and selling them, and you lose money ..."
Design of Consumptive Optical Fiber High Temperature Measuring Instrument
Design of Consumptive Optical Fiber High Temperature Measuring Instrument
1 IntroductionHigh temperature measurement plays an important role in aerospace, materials, energy, chemical industry, metallurgy and other fields. At present, in high temperature measurement, according to whether the measuring probe is in contact with the measured object, the temperature measuring instruments are divided into contact and non-contact.With the emergence of optical fiber technology, it provides conditions for the realization of contact temperature measurement. The contact optical fiber temperature measurement adopts a long quartz optical fiber as the temperature measurement probe and transmission system to keep the instrument away from the site with bad environment. At the same time, the optical fiber optical path is not affected by the environmental atmosphere, which greatly improves the environmental adaptability of the temperature measurement system. However, because the probe adopts the general radiation receiving principle, it is still difficult to solve the problem of emissivity. In order to overcome this problem, the principle of ash body temperature measurement is proposed. The colorimetric method can greatly reduce the influence of emissivity on the temperature measurement results. Under the best conditions, the influence can be reduced to zero. The advantage of such temperature measurement is that the temperature measurement response speed is fast, and the response speed is about 10s [3].The consumable optical fiber high temperature measuring instrument developed in this paper overcomes the above shortcomings and is a new method to measure the temperature of molten metal. Its temperature measurement accuracy is the same as that of the consumption thermocouple, but the temperature measurement cost is greatly reduced, which has great economic benefits and can completely replace the consumption thermocouple.2 principle of colorimetric temperature measurementColorimetric temperature measurement is a method to determine the temperature of an object by measuring the ratio of the radiance of the object at two different wavelengths. Its characteristic is that it can eliminate the interference caused by atmospheric, smoke, dust, ambient temperature and other factors on the measurement path.3 selection of working wavelengthAs can be seen from equation (3), it is very important to correctly select the wavelength and wavelength. Generally, the spectral radiance of the measured object is related to wavelength and temperature, as shown in Figure 1. The ordinate in the figure represents the radiation brightness of the blackbody, the abscissa represents the wavelength, and the temperature of the curve is getting higher and higher from bottom to top.From the curve in the figure, we can see several characteristics of blackbody radiation: (1) the total radiance increases rapidly with the increase of temperature. The higher the temperature, the greater the spectral radiance; (2) When the temperature is constant, the spectral radiance changes according to a certain law with different wavelengths, and the curve has a maximum value. The wavelength here is defined as that when the wavelength is less than, the radiance increases with the increase of the wavelength, and when the wavelength is less than, the change law is opposite; (3) When the temperature increases, the peak wavelength of spectral radiance moves to the short wave direction, the radiance of the object increases, and the luminous color also changes.The wavelength range is preliminarily set at 800 1000 nm, and there is no main absorption band of water vapor in this range, which can reduce the measurement error. When it is 800nm and 1000nm respectively, the relative sensitivity curve is shown in Fig. 2. The relative sensitivity of curve 1 in the figure is high. Therefore, it can be seen that it should be near 800nm. According to the relationship between the spectral response of the photodetector and temperature, it is required to have a good linear relationship. According to the linear relationship, it is better to take it near 950nm.After the experiment, the final choice = 890nm, = 940nm, the colorimetric temperature measurement effect is better.Fig. 2 relation curve between relative sensitivity and temperature
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