The most popular human sixth sense black technolog

2022-07-30
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The "black technology" of human sixth sense - infrared thermal imager

if you still think that the thermal imager is a high-end professional equipment and a military equipment, it is still far away from us. Sorry, you are out! The thermal imager in our impression often appears in some military reconnaissance, navigation operations and other professional operations. Nowadays, the application of thermal imager is almost everywhere around us. In recent years, with the development and popularization of hand-held infrared thermal imagers, they have gradually transformed from military professional precision instruments to portable, intelligent and even self-contained wi fi/cloud thermal imagers. If you are worried about problems such as where the water pipe leaks, where the TV screen is bad, or where the body is inflamed, you can be pleasantly surprised to tell you that the handheld thermal imager can solve such problems in a one-stop manner, and can also be uploaded to the cloud for storage and big data management

similarly, many industries are changing due to the popularity of thermal imagers: for example, if a fireman has a handheld thermal imager, he can accurately judge the location of the fire and accurately find the location of the trapped people; For example, in the event of an earthquake, if the UAV is equipped with a thermal imager, it can rush through many obstacles at the first time, find out the situation in the disaster area, and immediately find the trapped people. It will not repeat the previous situation that the first batch of rescue workers could only "touch the stone to explore the way", delaying the best rescue time; For another example, from ordinary stores or families to countries, the security system can accurately judge whether there are unsafe factors by using thermal imagers; For example, in the process of producing and processing products, many tests that cannot be observed with the naked eye and are limited by the accuracy of ordinary instruments, if there is a thermal imager, all the problems will be "clear at a glance"

at present, the application of infrared thermal imager has spread all over every corner of our life, from common medical imaging to spectral detection right around us, from food detection we gradually understand to radar modeling for military use, from the most familiar daily safety inspection to the upcoming automatic driving and intelligent life

fluke visible infrared thermometer VT02 is a testing tool for electricians and maintenance technicians

industrial application scenario of infrared thermal imager

perhaps you are not familiar with the industrial application of infrared thermal imager. Here is a brief introduction to the application of infrared thermal imager in industrial automation: whether the infrared thermal imager is good in automation, simple and clear inspection, processing process control, condition monitoring, fire prevention and monitoring, And continuous optical gas imaging

food production line quality control automobile windshield defrosting inspection

control the positioning of pipes in automatic welding machines thermal inspection of high-voltage equipment

hot spots on ladle display possible faults continuous monitoring warehouse

detection of fire risk in waste warehouse transformer temperature is too high

infrared thermal imager has great development potential and has ushered in a golden period of development

the development of infrared thermal imaging was mainly driven by national defense applications, The latest products are also mainly used in military products. Ten years' development almost makes this phenomenon a thing of the past. Nowadays, the wide application of thermal imaging in fire fighting, PVS, maritime, UAV, robot, intelligent building, smart home and smart store has made the application prospect of infrared sensor in business very optimistic. Take FLIR, the leader in the thermal imaging market, for example. In the three years since 2015, FLIR has shipped 1million lepton movements, which are integrated into more than 20 products (lepton is a key infrared movement that brings great success to FLIR); At the same time, FLIR has opened up a strategy full of wisdom to introduce uncooled infrared imaging technology into a wide range of products for different applications, so that uncooled infrared imaging technology can be more widely used and win a larger market

domestically, as a high-tech industry, the infrared thermal imaging industry has broad prospects for development. According to incomplete statistics, the potential demand of China's infrared thermal imaging technology market can reach 50-60 billion yuan. However, the current market situation is only in its infancy. By 2020, the infrared imaging market will grow by more than 20%. Domestic leading enterprises such as Gaode infrared, Dali technology, satyr infrared and Hikvision have also developed rapidly in the past decade, and new products and applications keep up with the pace of the times

How does the infrared thermal imager work

infrared thermal imaging is a technology that can convert infrared images into thermal radiation images. This technology can read temperature values from images. It is a non-destructive testing technology

infrared thermal imager is a high-tech product that is used to detect the infrared radiation of the target object and convert the temperature distribution image of the target object into video image by means of photoelectric conversion and electric signal processing. It actively cultivates new consumer market technology products such as yachts and ice sports equipment

how does the infrared thermal imager work

1. Working range of infrared thermal imager

in nature, objects whose temperature is higher than absolute zero (-273 ℃) can radiate electromagnetic waves. Infrared ray is the most extensive form of electromagnetic wave in nature. It is a kind of energy, which is invisible to our naked eyes. Any object in the conventional environment will produce its own random movement of molecules and atoms, constantly radiating thermal infrared energy

working spectrum of infrared thermal imager γ Rays and radio waves together form a complete and continuous electromagnetic spectrum. As shown in the above figure, the wavelength range is 0.78 μ M to 1000 μ M, we call it infrared radiation

the propagation of infrared radiation electromagnetic wave in the air will be absorbed by the atmosphere, which will cause the energy of radiation to be attenuated. If the absorbed energy is too much, it cannot be observed with a thermal imager. The absorption of infrared rays by the atmosphere and smoke clouds is also related to the wavelength of infrared radiation. For 3~5 μ M and 8~14 μ M is transparent. Therefore, these two bands are called "atmospheric windows" of infrared ray. Using these two windows, the infrared thermal imager can observe in normal environment without infrared radiation attenuation

2. Thermal imaging principle

generally speaking, infrared thermal imaging is to change invisible infrared radiation into visible thermal image. The radiation ability of different objects and even different parts of the same object and their reflection intensity of infrared ray are different. Using the radiation difference between the object and the background environment and the radiation difference of each part of the scene itself, the thermal image can show the radiation fluctuation of each part of the scene, so as to show the characteristics of the scene. The thermal image is actually the temperature distribution image of the target surface

3. Composition of the infrared thermal imager

the basic working principle of the infrared thermal imager is as follows: the infrared ray passes through a special optical lens and is absorbed by the infrared detector. The detector converts the infrared signals of different strengths into electrical signals, which are then amplified and video processed to form a thermal image that can be observed by the human eye and displayed on the screen. The thermal imager consists of two basic parts: optical system and detector

schematic diagram of working principle of infrared thermal imager

the thermal imager is very sensitive and can detect temperature difference less than 0.1 ° C. For example, the FLIR infrared thermal imager can recognize subtle temperature changes up to 0.02 ° C. with advanced detection technology and advanced mathematical algorithms, it can accurately measure the temperature of objects from -40 ° C to +2000 ° C

4. Classification of infrared thermal imagers

* according to the working temperature, it can be divided into refrigeration type/non refrigeration type

refrigeration type thermal imagers. A low-temperature cooler is integrated in the detector. This device can lower the temperature of the detector, so as to make the signal of thermal noise lower than the imaging signal and improve the imaging quality

the detector of uncooled thermal imager does not need low-temperature cooling. The detector used is usually based on micro bolometer, and there are mainly two kinds of detectors, polysilicon and vanadium oxide

cooling thermal imager (left) and uncooled thermal imager (right) imaging effect

* according to the function, it can be divided into temperature measuring type/non temperature measuring type

temperature measuring infrared thermal imager, which can directly read the temperature value of any point on the object surface from the thermal image. This system can be used as a nondestructive testing instrument, but the effective distance is relatively short

non temperature measuring infrared thermal imager can only observe the difference of thermal radiation on the surface of the object. This system can be used as an observation tool with a long effective distance

thermal image with temperature information thermal image without temperature information

heart of infrared thermal imager - infrared detector

infrared detector can be divided into infrared photon detector and infrared thermal detector from the detection mechanism

specific classification of infrared detectors

1. Photon detector: the basic working principle is that when the detector absorbs photons from the target or background radiation, the electrons in the outermost layer of the detector material transition to form free electrons in the crystal, resulting in photogenerated conductance or photogenerated volt effect. The intensity of photoconductivity and photovoltaic effect depends on the radiation intensity of the radiation source and the sensitivity of the detector. During the whole detection process, the temperature of the photon detector remains basically constant

2. Thermal detector: mainly by absorbing the energy of infrared radiation, the temperature of the detector changes, causing changes in the resistivity or polarity of the detector. The amount of change in the resistivity or polarity of the thermal detector also depends on the radiation intensity of the radiation source and the sensitivity of the detector

3. Comparison between the two types of infrared detectors: due to their different working mechanisms, these two types of detectors show different infrared response characteristics: photon detectors have the best response wavelength (peak wavelength), and the difference between blackbody response rate and peak response rate varies greatly with the different response bands of detectors; The response of the thermal detector is almost flat with the change of wavelength. Therefore, there is little difference between the blackbody response of the heat detector and the peak response of the then closed delivery valve. On the other hand, with the increase of the detector working at high temperature, the thermal detector can have higher sensitivity than the photoelectric detector. Therefore, it is usually widely used in occasions where the operating temperature is close to room temperature, which is called "uncooled" detector

examples of infrared detectors working at room temperature are HgCdTe semiconductor working at low temperature

4 and infrared thermopile detector

although compared with other infrared detectors, infrared thermopile detectors have low response sensitivity and long thermal response time, and do not have competitive advantages in device performance. However, the thermopile detector is easy to be made compatible with the integrated circuit process, and the signal post-processing circuit is also relatively simple. It has the potential of low cost. It has a certain application prospect in the fields of community security, safety monitoring and automobile assisted driving, which do not have high requirements for the quality of infrared imaging images. Therefore, the following is a specific introduction to the infrared thermopile detector

infrared thermopile detector is a kind of infrared thermal detector. Thermopile is composed of many thermocouples connected in series, which has greater output thermal potential than thermocouples. The previous infrared thermopile detectors were obtained by depositing thermocouple materials on plastic or ceramic substrates by means of mask vacuum coating, but the devices are large in size and difficult to mass produce. With the rapid development of microelectronics technology

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