The penetrating function of thermal imaging is mainly reflected in the fact that the infrared thermal imager is not affected by weather conditions, and can clearly penetrate severe weather conditions such as rain, snow and smog.

Principles and classification

Infrared thermal imager has two different principles: photon detection and thermal detection. The former mainly uses the electrical effect of photons on semiconductor materials to image with 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 classified according to the working band of the thermal imager and the photosensitive materials used.

The common thermal imager works at 3 to 5 microns or 8 to 12 microns, and the common photosensitive materials are lead sulfide, lead selenide, indium telluride, lead tin telluride, mercury cadmium telluride, doped germanium and doped silicon. According to the number and movement mode of photosensitive elements, there are two types: mechanical scanning and staring imaging.

Extended data:

Thermal imaging inspection

First, comprehensive system.

Professional 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. The application of far-infrared thermal imaging technology has been able to detect inflammation, tumors, stones, vascular diseases, nervous system, sub-health and other diseases 100, involving common and frequently-occurring diseases in various systems of human body.

Second, "green" is non-invasive.

Many imaging instruments are more or less harmful to human body. Far-infrared thermal imaging diagnosis will not produce any rays, and there is no need to label drugs. Therefore, it will not cause any harm to human body and 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".

Third, it is conducive to the early detection of diseases.

Compared with X-ray, B-ultrasound, CT and other imaging technologies, one of the most important advantages of far-infrared thermal imaging detection is early warning.

Although X-ray, B-ultrasound, CT and other techniques have their own characteristics, they can only be found after the disease is formed. Before the tissue structure and morphology change, the cell metabolism will be abnormal, and the temperature of the human body will also change. The level of temperature, the shape of temperature field and the size of temperature difference can reflect the location, nature and degree of disease.

Far-infrared thermal imaging technology can find diseases according to the abnormal temperature of human body, so it can interpret potential hidden dangers and find problems earlier without obvious signs of human body. Some data show that far infrared thermal imaging can find lesions half a year or even earlier than structural imaging, which has won valuable time for early detection and prevention of diseases.

References:

Baidu encyclopedia-thermal imaging