In 1800, the British physicist FW Husserl discovered infrared, and since then opened a broad road for humans to use infrared technology. In the Second World War, the Germans used infrared image converters as photoelectric conversion devices and developed active night vision and infrared communication equipment, which laid the foundation for the development of infrared technology.
After World War II, the United States, after nearly a year of exploration, developed the first-generation infrared imaging device used in the military field, called the infrared viewing system (FLIR). It uses an optical mechanical system to measure the target. Infrared radiation scan. The photon detector receives two-dimensional infrared radiation signs, which are processed by photoelectric conversion and a series of instruments to form a video image signal. The original form of this system is a non-real-time automatic temperature distribution recorder. Later, with the development of indium antimonide and germanium mercury-doped photon detectors in the 1950s, high-speed scanning and real-time display of target thermal images began to appear. system.
In the early 1960s, Sweden successfully developed the second-generation infrared imaging device. It is based on the infrared viewing system to increase the temperature measurement function. It is called an infrared thermometer .
At first, due to confidentiality reasons, it was limited to military use in other developed countries. Thermal imaging devices that were put into use could detect each other's targets in the dark or thick curtain clouds, detect camouflage targets and high-speed moving targets. Supported by funds from other countries, the investment in research and development is very high, and the cost of the instrument is also high. In the future, considering the practicability in the development of industrial production, combined with the characteristics of industrial infrared detection, the cost of compression instruments was adopted. According to the requirements of civilians, measures such as reducing scanning speed and improving image resolution have gradually developed into the civilian sector.
In the mid-1960s, the first industrial real-time imaging system (THV) was developed. The system was cooled by liquid nitrogen, powered by a 110V power supply, and weighed about 35 kg. Therefore, it was poor in portability during use. After several generations of the instrument Improved. The infrared thermometer developed in 1986 no longer needs liquid nitrogen or high pressure gas. It can be cooled by thermoelectricity and can be powered by batteries. It is a full-featured thermal imager introduced in 1988 that measures temperature, modifies, analyzes, and collects images. The storage and storage are integrated into a whole, the weight is less than 7 kg, and the function, accuracy and reliability of the instrument have been significantly improved.
In the mid-1990s, the United States successfully developed a new infrared thermometer (CCD) from military technology (FPA) to civilian use and commercialization. It is a condensing imaging device with a focal plane array structure. It has more advanced technical functions and on-site temperature measurement. Just aim at the target to take the image, and store the above information on the PC card inside the machine, and all operations are completed. The settings of various parameters can be returned to the room for software modification and analysis of the data, and the detection can be directly obtained later. It is reported that due to technological improvements and structural changes, instead of complex mechanical scanning, the weight of the instrument has been less than two kilograms, and it can be easily operated with one hand in the same way as a handheld camera in use.
Today, infrared thermal imaging systems have been widely used in power, fire protection, petrochemical, and medical fields. Infrared thermometer is playing a pivotal role in the development of the world economy.
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