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Thermal infrared life detector has night vision function, its principle is to judge different targets by sensing the temperature difference, so it can work as usual in the dark. Professor Wang said that this kind of instrument is a bit like the one that measures body temperature at the entrance of shopping malls, but it is bigger than that, and it has an image display.
The Sonic Vibration Life Detector relies on recognizing the sound of trapped persons. Humans have two ears, but this instrument has 3-6 ears. Its ears are called "vibrators", also called vibration sensors. It can judge the specificity of survivors based on the small differences in the sounds heard by each ear position. The sound of speech is the easiest to recognize because the designer has fully studied the frequency of human speech. If the survivor is no longer able to speak, as long as he taps gently with his finger, a small sound will be heard. The key is that the influence of noise cannot be too great.
Earthquake Rescue Equipment Manual-Life Detector
There are two other commonly used search instruments: thermal infrared life detector and sonic vibration life detector.