Principle of infrared sensor lamp

What is an infrared sensor light? This is a new generation of lighting fixtures, we will see in some doorways, walkways or in front of the booth. When someone walks by or approaches, the lighting fixtures will turn on, after a delay After that, the lighting will turn off again. This is the application of infrared sensor light. So what is the working principle of the infrared sensor lamp?

When a person enters the sensing range, a part of the human body is in the infrared region of the infrared human body sensor, and the infrared emission tube will emit infrared rays. Due to the occlusion and reflection of the human body, it will be reflected to the infrared rays. The signal is processed by the microcomputer in the integrated circuit. Send to the pulse solenoid valve. After receiving the signal, the solenoid valve opens the spool according to the designated instruction to control the head water discharge. When the human 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 closing water.
As long as the human body does not leave the sensing area, the switch will continue to be turned on. After the human body leaves, the load will be automatically turned off after a delay. The lights are on when people arrive, and the lights are off when people leave.