How Thermal Infrared Body Sensors Work

[ Pacific Security Network News ]
Do you know how the body sensor works? The following is a brief introduction to the Pacific Security Network. The thermal infrared human body sensor is developed according to the principle of infrared reflection. It belongs to a kind of intelligent water-saving and energy-saving equipment, which is commonly used in induction faucets, automatic hand dryers, medical hand washing machines, etc. This paper mainly introduces the principle of thermal infrared human body sensors.
The principle of thermal infrared human body sensor is actually the principle of infrared reflection
The human body has a constant body temperature, generally at 37 degrees, so it emits infrared rays with a specific wavelength of about 10 UM. Passive infrared probes work by detecting infrared rays of about 10 UM emitted by the human body. The infrared light emitted by the human body of about 10 UM is enhanced by the Philippine filter and collected on the infrared sensing source. Infrared sensors usually use pyroelectric components, which lose charge balance when the temperature of the infrared radiation of the human body is received, and discharge the charge outward. The subsequent circuit can trigger the switching action after being detected and processed.
When the human hand or a part of the body is in the infrared region, the infrared rays emitted by the infrared emission tube are reflected to the infrared receiving tube by the human hand or the body, and the signal processed by the microcomputer in the integrated circuit is sent to the pulse solenoid valve, and the electromagnetic After the valve receives the signal, the valve core is opened according to the specified command to control; when the human hand or body leaves the infrared sensing range, the solenoid valve does not receive the signal, and the solenoid valve spool is reset controlled by the internal spring.
It can be seen from the principle of thermal infrared human body sensor that thermal infrared human body sensors play an increasingly important role in science and technology, industrial and agricultural production, and daily life. The increasing demands of human society on sensors are The powerful driving force of the development of thermal infrared human body sensor technology.

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