Classification of thermal imagers
Infrared thermal imagers are generally divided into spectral scanning imaging systems and non-scanning imaging systems. Optomechanical scanning imaging systems use single-unit or multi-element (8, 10, 16, 23, 48, 55, 60, 120, 180 and even more) photoconductive or photovoltaic infrared detectors. Unit detectors are slow. Mainly because the frame response time is not fast enough, the multi-element array detector can be made into a high-speed real-time thermal imager. Non-scanning imaging thermal imagers, such as the array staring focal plane thermal imager introduced in recent years, are a new generation of thermal imaging equipment, far superior to optomechanical scanning thermal imagers in terms of performance. performance and gradually replace them. The development trend of optomechanical scanning thermal imager. The key technology is that the detector is composed of a monolithic integrated circuit, and the entire field of view of the measured target is concentrated on it, which makes the image clearer and more convenient to use. The instrument is very small and lightweight. Temperature, line temperature, isothermal, voice annotation image function, the instrument adopts PC card, the storage capacity can reach 500 images.
An infrared thermal imaging TV is a thermal imaging camera. Infrared thermal imaging TV is to receive infrared radiation from the surface of the target object to be measured through a pyroelectric video tube (PEV), and convert the invisible thermal image of the thermal radiation distribution in the target into a video signal. Therefore, the pyroelectric picture tube is a key optical device for infrared thermal television, and a medium-resolution thermal imaging device for real-time imaging and wide-spectrum imaging (good frequency response to 3-5μm and 8-14μm). It consists of three parts: lens, target surface and electron gun. Its technical function is to focus and image the infrared radiation of the measured target onto the pyroelectric camera tube through the lens, which is realized by using the normal temperature thermal TV detector, electron beam scanning and target surface imaging technology.
