asurement and below freezing temperature measurement, this is also the trend of radiation thermometer. Commercially available infrared thermometer temperature is range from -30 ℃~3000 ℃, the middle is divided into several different specifications, you can select the appropriate model according to the need. Figure 3 shows the shape of the infrared radiation thermometer. 2) Pyroelectric sensor Pyroelectric infrared sensor can detect infrared light transmitted by person or animal and output corresponding electric signal. Pyroelectric infrared detection devices have been widely used in infrared spectroscopy, infrared remote sensing and radiation detectors. Fig. 3. The shape of the infrared radiation thermometer It is also used in human detection, alarm, which can produce farinfrared radiation,
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