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Infrared Alarm

The infrared alarm to prevent human intrusion is composed of pyroelectric infrared sensor and alarm controller. When someone enters the range to be protected, the sensor generates an electrical signal and transmits it to the controller, and the controller sends the alarm signal to the terminal through signal processing.

The core of the infrared alarm is the infrared pyroelectric sensor, also known as the human body induction sensor, which is a sensor that can detect the infrared rays emitted by the human body and convert it into an electrical signal output. Any object above absolute temperature produces electromagnetic radiation—infrared, but the wavelengths and energy of infrared rays radiated by objects of various different temperatures are different. The higher the surface temperature of an object, the more energy it radiates. Through the filter in the rectangular window at the top of the sensor, the wavelength of the strongest infrared rays radiated by the human body just falls in the center of the response wavelength (7~14μm) of the filter window, and its peak wavelength is about 9.4 μm, so that to sense the presence of the human body.

Infrared Alarm ZRD-09 sensor

It can be seen from the above analysis that as long as there is someone within a certain distance, the sensor can respond accordingly.This is exactly what the anti-theft system aims to achieve, that is, to detect an intrusion into the guarded area.

Winsen Technology pyroelectric sensor module ZRD-09 has large viewing angle and stable performance, which is very suitable for infrared alarms

With the development of science and technology, many products combine smart doorbells with infrared alarms. Combining infrared human body sensing and AI face recognition technology, when someone stops abnormally at the door, the smart doorbell will take a photo, and if necessary, the infrared alarm will sound an alarm and send a message to remind the owner of the house in time.

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