What is the principle of an infrared detector?
An infrared detector is a radiant energy converter that converts infrared radiation energy into electrical energy, heat, and other forms of energy that are easily measured or observed
According to the mode of energy conversion, infrared detectors can be divided into two categories: thermal detectors and photon detectorsThe working mechanism of thermal detector is based on the thermal effect of incident radiation caused by the change of electrical characteristics of a detector, and the photon detector is the photoelectric effect and incident photon flux detection materials based on the interaction, the specific performance of the detector response element free carrier (i.e., electronic and / or change the number of holes). Because of this change is caused by by the change of the incident photon, photon detector response is proportional to the photon absorption. The thermal detector response is proportional with the absorbed energy.
Thermal detector energy exchange process includes: thermal effect, heat effect and heat effect of V, pyroelectric effect. Photon detector can change the process including: photovoltaic effect, photoconductive effect, photoelectric magnetic effect and light emission effect.
