What are the types of infrared sensor detectors?
What are the types of infrared sensor detectors?
Infrared sensor detectors can usually be divided into two categories based on their detection mechanisms: thermal detectors and photon detectors.
Thermal detectors utilize the thermal effect of infrared radiation being absorbed by objects and converted into heat energy. When the sensitive element of a heat detector absorbs infrared radiation, it will cause a temperature rise, resulting in changes in the relevant physical parameters of the sensitive element. By measuring these physical parameters and their changes, the infrared radiation absorbed by the detector can be determined.
2) Photon detector
Photon detector type infrared sensors work by utilizing the photon effectsensor. The photon effect is when infrared radiation is incident on certain semiconductor materials, and the photon flow in the infrared radiation interacts with the electrons in the semiconductor material, changing the energy state of the electrons and causing various electrical phenomena. By measuring the changes in electronic properties in semiconductor materials, the strength of infrared radiation can be determined. Photon detectors are mainly divided into two types: internal photodetectors and external photodetectors. Internal photodetectors are further divided into three types: photoconductive, photovoltaic, and magneto electric detectors.
The high transmittance bands where electromagnetic waves are less reflected, absorbed, and scattered through the atmosphere are called atmospheric windows. yesinfra-redThe influence of line propagation mainly manifests as absorption and reflection.
