The working principle of infrared body sensor
With the development of the Internet of Things, the application of infrared body sensors has become more and more popular in detecting whether someone has passed by, or detecting people’s actions.
Basic principle
Infrared body sensor refers to the use of a detector to detect changes in the human body after someone enters the sensing range of the product. This article will focus on the infrared body sensor working principle.
Infrared intelligent power saving switch is an automatic control product based on infrared technology. When someone enters the sensing range, the special sensor detects changes in the infrared spectrum of the human body, automatically switches on the load, and the person does not leave the sensing range, will continue to switch on; After the person leaves, the delay automatically closes the load. People to the light, people off the light, friendly and convenient, safety and energy saving, but also shows humanized care.
The so-called human infrared sensing switch refers to a switch that automatically starts when someone passes through the infrared sensing detection area. The main device of human body infrared sensor is pyroelectric infrared sensor. The human body has a constant body temperature, generally 37 degrees, so it will emit a specific wavelength of about 10μm infrared, passive infrared probe is to detect the infrared emitted by the human body about 10μm and work.
About 10μm infrared rays emitted by the human body are enhanced by the Fresnel filter and concentrated on the infrared sensor. The infrared sensor usually uses a pyroelectric element, which loses the charge balance when the infrared radiation temperature of the human body changes, releases the charge outward, and the subsequent circuit can trigger the switch action after detection and processing. People do not leave the sensing range, the switch will continue to be switched on; After the person leaves or does not act for a long time in the sensing area, the switch will automatically delay closing the load.
Automatic control products based on infrared technology. Zero crossing detection function: no contact electronic switch, prolong the load life. Application of light sensitive control, switch automatic metering, no induction when light is strong. The above is some relevant introduction to the characteristics of the human infrared induction switch, hoping to provide a reference.
The automatic faucet in some public toilets is based on the principle of infrared reflection. When the human hand or a part of the body is in the infrared region of the infrared human sensor, the infrared emitted by the infrared transmitting tube is reflected to the infrared receiving tube by the human hand or the product of the body, and the signal processed by the microcomputer in the integrated line is sent to the pulse solenoid valve. After receiving the signal, the solenoid valve opens the spool according to the specified instruction to control the head water; 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 by the internal spring to control the water off.
Infrared body sensor performance is stable, truly achieve both energy saving and environmental protection, can be said to be the perfect alternative to sound-light control products. It is through human body radiation, can automatically and quickly open a variety of lamps, anti-theft alarms, automatic doors and other equipment. Especially suitable for medium and senior hotels, apartments, enterprises and institutions, shopping malls, corridors, corridors and so on. The trigger mode can be one trigger or continuous trigger.
