In a passive infrared detector, what event triggers an alarm?

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Multiple Choice

In a passive infrared detector, what event triggers an alarm?

Explanation:
Passive infrared detectors trigger when there is a change in infrared radiation within their sensing area. They don’t respond to a steady heat level; instead, they monitor the heat pattern in the field of view. When a warm object moves, the infrared energy reaching the detector changes over time, creating a signal that activates the alarm. Changes outside the field of view or humidity near the detector don’t alter the infrared pattern in the sensed area, so they don’t typically trigger the device.

Passive infrared detectors trigger when there is a change in infrared radiation within their sensing area. They don’t respond to a steady heat level; instead, they monitor the heat pattern in the field of view. When a warm object moves, the infrared energy reaching the detector changes over time, creating a signal that activates the alarm. Changes outside the field of view or humidity near the detector don’t alter the infrared pattern in the sensed area, so they don’t typically trigger the device.

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