March 18, 2021
Infrared Sensor refers to the use of a detector to detect changes in the human body when someone enters the sensing range of the product. And this article will focus on the working principle of Infrared Sensor.
Infrared Sensor is an automatic control product based on infrared technology. When someone enters the sensing range, the dedicated sensor detects the change in the infrared spectrum of the human body, and automatically turns on the load. If the person does not leave the sensing range, it will continue to turn on; after the person leaves, the delay Automatically shut down the load. The lights are on when people arrive, and the lights are off when people leave. It is cordial and convenient, safe and energy-saving, and shows humane care.
The so-called Infrared Sensor refers to a switch that is automatically activated when someone passes through the infrared sensing detection area. The main component of the human body infrared sensor switch is the human body pyroelectric infrared sensor. The human body has a constant body temperature, generally 37 degrees, so it emits infrared rays with a specific wavelength of about 10μm. The passive infrared probe detects the infrared rays emitted by the human body at about 10μm and works.
The infrared light of about 10μm emitted by the human body is enhanced by the Fresnel filter and collected on the infrared sensor source. Infrared induction sources usually use pyroelectric elements. This element loses charge balance when the temperature of the infrared radiation of the human body changes, and discharges charges outward. The subsequent circuit can trigger the switch after the detection and processing. If the person does not leave the sensing range, the switch will continue to be turned on; after the person leaves or there is no action for a long time in the sensing area, the switch will automatically delay the shutdown of the load.
Automatic control products based on infrared technology. Zero-crossing detection function: non-contact electronic switch to extend the service life of the load. Application of photosensitive control, switch automatic metering, no induction when the light is strong. The above are some related introductions of the characteristics of the human body infrared sensor switch, I hope to provide a reference.
The automatic faucets in some public toilets use 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 light emitted by the infrared transmitting tube is reflected by the human hand or body to the infrared receiver. Tube, the signal processed by the microcomputer in the integrated circuit 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 accept Signal, the solenoid valve core is reset by the internal spring to control the shut-off.
Infrared Sensor has stable performance, and is truly energy-saving and environmentally friendly. It can be said to be a perfect substitute for sound and light control products. It is through human body radiation, can automatically quickly turn on various lamps, anti-theft alarms, automatic doors and other equipment. Infrared Sensor is especially suitable for medium and high-end hotels, apartments, enterprises and institutions, shopping malls, aisles, corridors, etc. The trigger mode is one-time trigger and continuous trigger.
