Classification of infrared thermometers

Infrared thermal imager is generally divided into scanning imaging system and non-scanning imaging system. The photoelectric scanning imaging system adopts single-element or multi-element (the number of elements is 8, 10, 16, 23, 48, 55, 60, 120, 180 or even more) photoconductive or photovoltaic infrared detectors. When using a single detector, the speed is slow, mainly because the frame response time is not fast enough and the multi-element array. Non-scanning imaging thermal imager, such as array staring imaging focal plane thermal imager introduced in recent years, belongs to a new generation of thermal imaging devices, and its performance is far superior to that of optical scanning thermal imager, and it has a tendency to gradually replace optical scanning thermal imager. The key technology is that the detector is composed of a monolithic integrated circuit, and the whole field of view of the measured object is focused on it, which makes the image clearer and more convenient to use. The instrument is very small and light, and has the functions of auto-focusing image freeze-frame, continuous amplification, point temperature, line temperature, isothermal, voice labeling and so on. The instrument adopts PC card, and the storage capacity can be as high as 500 images.

Infrared thermal imager is a kind of infrared thermal imager. Infrared thermal TV receives infrared radiation from the surface of the target object to be measured through a pyroelectric camera tube (PEV), and converts the invisible thermal image of the thermal radiation distribution in the target into a video signal. Therefore, the pyroelectric camera tube is an optical key device of infrared thermal TV, which is a thermal imaging device with real-time imaging, wide spectrum imaging (good frequency response to 3 ~ 5 microns and 8 ~ 14 microns) and medium resolution, mainly composed of lenses. Its technical function is to focus the infrared radiation of the target on the pyroelectric camera tube through the lens, and realize it by using the technologies of constant temperature TV detector, electron beam scanning and target surface imaging. The main parameters of the thermal imager are:

1 working band; The working band refers to the response wavelength region of the infrared detector selected in the infrared thermal imager, which is generally 3 ~ 5 microns or 8 ~ 12 microns. ..

2 detector type; The detector type refers to the infrared equipment used. It is a photoconductive or photovoltaic infrared detector, which has one unit or multiple elements (element 8, 10, 16, 23, 48, 55, 60, 120, 180, etc.). ), its elements are lead sulfide (PbS), lead selenide (PnSe) and so on.

3 scanning system; Generally, it is China standard TV system and PAL system.

4 display mode; Refers to whether the screen display is black and white or false color.

5 temperature measuring range; Refers to the temperature range between the lower limit and the upper limit of the measured temperature.

6. Accuracy of temperature measurement; Refers to the percentage of the ratio of the maximum temperature error of infrared thermal imager to the instrument range.

7 Maximum working hours; Infrared thermal imager allows continuous working time.