Infrared Sensors FAQQHow about operating principle of Pyroelectric infrared sensor?

Pyro-electric effect is a phenomenon such as;
When the temperature of pyro-electric ceramic is changed, spontaneous polarization of ceramic is changed by the amount of temperature change. Then the amount of electric charge is varied depending on the change of spontaneous polarization. Pyro-electric infrared sensor generates signal output when it detect temperature change of ceramic.

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