PIR sensor element detects motion by measuring infrared radiation changes in its field of view.
A passive infrared sensor element is a pyroelectric component that detects motion by sensing changes in infrared radiation emitted by objects within its detection range. It consists of a pyroelectric material that generates electrical signals when exposed to varying thermal radiation, typically configured with dual or quad sensing elements to differentiate between ambient temperature changes and moving heat sources.
诱因 → 失效模式 → 工程缓解
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PIR sensors detect infrared radiation from moving heat sources, while microwave sensors emit and detect reflected radio waves. PIR is more energy-efficient and less prone to false triggers from non-living objects, but microwave sensors can detect through non-metallic materials.
Extreme temperatures can reduce sensitivity. Most industrial PIR sensors include temperature compensation circuits and operate effectively between -20°C to +70°C. Sudden temperature changes may cause false triggers until the sensor stabilizes.
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