We all know that no matter what the object is emit electromagnetic radiation, and infrared sensor is in using this principle, once the temperature changes of the object, so it is the wavelength of the electromagnetic wave radiation of also change, and the change of the wavelength shift into the change of temperature, and realized the purpose of temperature measurement.

Mainly including the optical system, infrared sensor components and conversion circuit. And its optical system according to the different structure of which can be roughly divided into the transmission type and reflection type two kinds. The detecting element can be roughly divided into thermal detecting element and photoelectric detecting element. The most is a thermistor temperature sensor application. Thermistor it mainly by infrared radiation will lead to an elevated temperature, resistance will change at this time, then through conversion circuit and then into electrical signal output. The photoelectric detecting element is the most commonly used photosensitive element.

Then the basic principle of infrared sensors work is actually less complicated:

1, the target under test. We according to the infrared radiation characteristics of the target under test and infrared system setting.

2, atmospheric attenuation. Infrared radiation of the target under test can through earth's atmosphere, so at this time due to gas molecule and all sorts of all sorts of gas sol particle scattering and absorption, will cause the infrared source emits infrared radiation attenuation.

3, optical receiver. The goal of this receiver is is part of the infrared radiation and transmission to infrared sensor. Is also a significant one in radar antenna.

4, according to the mechanism of the sensor detection is different, it can be roughly divided into heat detector and the two photon detector.