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Reducing the influence of low temperature objects on PIR sensors? Answered

​Hello, can anybody please help me with this? I was wondering if there was some sort of filter/material that I could place in front of a pir module, that would filter out any low temperature objects and only allow high amounts of infrared radiation to pass through and trigger the sensor (body heat). I plan to mount the sensor on a rotating turret, and when it spins I don't want the sensors to be triggered by the moving background (walls, bookshelves, etc.) thanks.

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Downunder35m
Downunder35m

4 years ago

You can only use a high quality sensor that allows you to block certain areas.
Bush Jäger has some for example.
The sensor does not work by detecting how hot or cold something is but only by the temp difference compared to the next cell.
So you can only totally block these areas or use a different type of sensor.

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steveastrouk
steveastrouk

4 years ago

Look at the naked sensor output: High output = high rate of change of temperature, you need to set a threshold.