Suppose a person (height of 1.8 m) walks in a room installed with a pyroelectric infrared (PIR) motion detector. The distance be

Question

3 years ago

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Suppose a person (height of 1.8 m) walks in a room installed with a pyroelectric infrared (PIR) motion detector. The distance be

tween the person and the PIR detector is 5 m. The PIR detector sensor is 3 cm x 1 cm in size.
Estimate the radiated power at the surface of the sensor from the person. Assume that emissivity of human skin/fabric and sensor cap is 0.9. Assume that the person’s body temperature is 37°C and the temperature at the surface of PIR detector is at 18°C. Also assume that there is no radiated power loss through air and Fresnel lens. You can roughly estimate surface area of the person.

Engineering

1 answer:

3241004551 [841] · Answer 1 · 2022-02-07T18:29:35+03:00

3241004551 [841]3 years ago

8 0

Answer: b is your best option

Explanation: