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Detector Infrared Radiation Photodetectors

An infrared detector is a device that reacts to infrared radiation. There are two main types - thermal detectors, which detect temperature changes from IR radiation through effects like resistance changes in bolometers and thermocouples, and photonic detectors, which are semiconductors that can detect electronic excitations from IR photons and must be cooled to reduce thermal noise.

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33 views1 page

Detector Infrared Radiation Photodetectors

An infrared detector is a device that reacts to infrared radiation. There are two main types - thermal detectors, which detect temperature changes from IR radiation through effects like resistance changes in bolometers and thermocouples, and photonic detectors, which are semiconductors that can detect electronic excitations from IR photons and must be cooled to reduce thermal noise.

Uploaded by

Debalina Panda
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© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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An infrared detector is a detector that reacts to infrared (IR) radiation.

The two main types of detectors are


thermal and photonic (photodetectors).
The thermal effects of the incident IR radiation can be followed through many temperature dependent
phenomena.

Bolometers and microbolometers are

based

on

changes

in

resistance. Thermocouples and thermopiles use the thermoelectric effect. Golay cells follow thermal
expansion. In IR spectrometers the pyroelectric detectors are the most widespread.
The response time and sensitivity of photonic detectors can be much higher, but usually these have to be
cooled to cut thermal noise. The materials in these are semiconductors with narrow band gaps. Incident IR
photons can cause electronic excitations. In photoconductive detectors, the resistivity of the detector element is
monitored. Photovoltaic detectors contain a p-n junction on which photoelectric current appears upon
illumination.

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