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Pyroelectric sensor - Coggle Diagram
Pyroelectric sensor
Operation Principle
Contains a piece of ferroelectric crystal material with electrodes on two sides. 
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The incident light is absorbed on the coating and causes some heating of the crystal, because the heat is conducted through the electrode into the crystal.
Belong to the thermal detectors because they do not directly respond to radiation, but only to the generated heat
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Optical Energy
Typically used to measure the energy of pulsed lasers where the pulses may vary in width from fs to ms and in energy from sub µJ to J.
The peak of the output voltage is a measure of the charge produced by the detector and therefore, of the pulse energy
Since it is the change in temperature that produces the current, pyroelectric detectors respond only to pulsed or modulated radiation.