In 1800, the British physicist F. W. Heusl discovered the infrared ray, thus opening up a vast road to human application of infrared technology. In the Second World War, the German used infrared image tube as a photoelectric conversion device, developed an active night vision and infrared communications equipment, which laid the foundation for the development of infrared technology.
After the Second World War, first of all, after nearly a year's exploration by the United States, the first infrared imaging device developed for the military field was called the Infrared Vision System (FLIR), which is based on the optical mechanical system Measure the target's infrared radiation scan. The photon detector receives two-dimensional infrared radiation signs, the photoelectric conversion and a series of instrument processing, the formation of video image signals. This system, in its original form, was a non-real-time, automatic temperature profiler that began to show high-speed scanning and real-time display of target thermal images with the development of indium antimonide and germanium doped mercury photons in the 1950s system.
In the early sixties, Sweden successfully developed the second generation of infrared imaging device, which is based on infrared search system to increase the temperature measurement function, called the infrared camera.
Initially due to confidentiality reasons, in developed countries is also limited to the military, the application of thermal imaging devices can detect each other in the dark night or thick clouds, detect camouflage targets and high-speed movement of the target. Owing to the support of state funds, the cost of R & D is greatly increased, and the cost of instruments is also very high. After taking into account the practicality in the development of industrial production, combined with the characteristics of industrial infrared detection, compression equipment to take the cost. Measures to reduce production costs and increase image resolution by reducing scanning speed are gradually evolving into the civilian domain, according to civilian requirements.
In the mid-1960s, the first real-time imaging system (THV) for industrial use was developed. It was cooled by liquid nitrogen and supplied with a voltage of 110V and weighs about 35 kg. As a result, its portability was poor. Several generations of improvement,
Developed in 1986, the infrared camera has no liquid nitrogen or high pressure gas, while the thermoelectric cooling, battery-powered;
The all-in-one thermal imaging camera introduced in 1988 combines temperature measurement, modification, analysis, image acquisition and storage with a weight of less than 7 kg. The function, accuracy and reliability of the instrument have been significantly improved.
In the mid-1990s, the United States first developed a coagulation imaging device that succeeded in transitioning from commercial technology (FPA) to commercialization and was commercialized with a focal plane array (CCD) structure. The technology was more advanced in function and field measurements Only need to aim at the temperature when the intake of images, and the above information stored in the machine's PC card, that is to complete all operations, the setting of various parameters can be returned to the indoor software to modify and analyze the data, the final direct Test reports, due to technical improvements and structural changes, replaced the complex mechanical scanning, the weight of the instrument has been less than two kilograms, using the same as the handheld camera, one hand can be easily operated.
Nowadays, infrared thermal imaging systems have been widely used in electric power, fire fighting, petrochemical and medical fields. Infrared cameras are playing a decisive role in the development of the world economy.
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