Infrared thermal imager has two different principles: photon detection and thermal detection. The former mainly uses photons to image the electrical effect of semiconductor materials, which has high sensitivity, but the temperature of the detector itself will affect it, so it needs to be cooled down. The latter converts the heat generated by light into electrical signals, which is not as sensitive as the former, but does not need refrigeration.
In addition, it is also classified according to the working band of the thermal imager and the photosensitive materials used. The common thermal imager works at 3-5 microns or 8- 12 microns, and the common photosensitive materials are lead sulfide, lead selenide, indium telluride, tin lead telluride, mercury cadmium telluride, doped germanium and doped silicon. According to the number and movement mode of photosensitive elements, there are mechanical scanning, staring imaging and so on.
Thermal imager is widely used, especially in the military. It can be used to find tank engines and soldiers who radiate heat at night. In industry, thermal imager can be used to quickly detect the temperature of the workpiece, so as to grasp the necessary information. Because the faults of electronic components such as motors and transistors are often accompanied by abnormal temperature rise, thermal imager can also be used to diagnose faults quickly.
In medicine, when influenza, pneumonia and other diseases are prevalent, a thermal imager can be used to quickly judge whether there is fever. Because of the high temperature of cancer cells, it can also be used to help diagnose diseases such as breast cancer. The frontier defense department can also use it to judge whether there are illegal immigrants hiding in vehicles or border areas.
Advantages of thermal imaging detection
1. Integrated system.
Doctors can comprehensively and systematically analyze the general situation of patients in combination with clinical practice, which overcomes the one-sidedness of other diagnostic techniques limited to a certain part. Far-infrared thermal imaging can detect inflammation, tumor, calculus, vascular disease, nervous system, sub-health and other diseases 100, involving common and frequently-occurring diseases in various systems of human body.
2. "Green" is non-invasive.
Many imaging instruments are more or less harmful to human body, but far infrared thermal imaging diagnosis will not produce any rays, so there is no need to label drugs. Therefore, it will not cause any harm to human body, nor will it cause any pollution to the environment, and it is simple and economical. Far-infrared thermal imaging technology has realized human's dream of pursuing green health, and people vividly call this technology "green physical examination".
3. Conducive to the early detection of diseases.
Compared with X-ray, B-ultrasound, CT and other imaging technologies, the most important advantage of far-infrared thermal imaging detection is early warning.
X-ray, B-ultrasound, CT and other techniques have their own characteristics, but they can only be found after the disease is formed. Before the tissue structure and morphology of the disease change, the cell metabolism will be abnormal and the temperature of the human body will also change. Temperature, the shape of temperature field and temperature difference can reflect the location, nature and degree of disease.
Far-infrared thermal imaging technology can detect diseases according to the abnormal temperature of human body, so it can interpret potential hidden dangers and find problems earlier without obvious signs.
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