Security alarm
Human infrared alarm, capable of detecting infrared radiation emitted by the human body.
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It consists of a pyroelectric infrared sensor, a signal amplification circuit, a Fresnel lens, a voltage comparator, a delay circuit, and an alarm indication circuit.
When a person enters the surveillance area of the alarm device, an alarm signal is triggered. This system is suitable for relatively important locations such as homes, offices, warehouses, and laboratories.
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