Principle of human body sensing module

The human body sensing module is a device that can perceive the dynamics of the human body, Mainly used in the field of smart home and security. Its working principle is mainly based on infrared sensing technology and microwave radar technology.
Infrared sensing technology is a widely used non-contact measurement technique that detects the presence of objects by sensing infrared radiation. The human body sensing module usually adopts an active passive dual element infrared sensing structure, mainly composed of an infrared transmitter and an infrared receiver.

When an object (such as a human body) passes through the sensing area, the infrared transmitter will emit infrared radiation, and the receiver will receive this radiation. The human body sensing module analyzes the received reflection signals to determine whether the object is a human body, and further obtains dynamic information of the object, such as motion speed and direction. During this process, the human body sensing module will convert the received infrared signal into a digital signal and process it through an internal signal processing circuit. This processing circuit typically includes processes such as filtering, amplification, and digitization to extract effective human dynamic signals. Next, by comparing with the preset human body features, determine whether the human body is detected and trigger the corresponding operation.
Microwave radar technology detects the presence of objects by sending microwave signals and receiving their reflected signals. Compared with infrared sensing technology, microwave radar technology has a longer effective detection distance and stronger adaptability, and is not affected by environmental factors such as light and temperature.
The microwave radar technology used in the human body sensing module is usually continuous wave radar, which works by emitting continuous microwave signals and detecting their interaction with the human body.
When an object (such as a human body) approaches the sensing area, microwave signals will interact with the object, some of which will be absorbed by the object, and some of which will be reflected back. The human body sensing module analyzes the frequency and amplitude changes of the received reflection signal to achieve the purpose of detecting human body dynamics.
In practical applications, human body sensing modules are usually optimized and improved according to actual needs. For example, parameters such as sensing range, sensing sensitivity, and sensing duration can be set to meet the needs of different scenarios.

In summary, the human body sensing module can achieve sensing and detection of human body dynamics through infrared sensing technology and microwave radar technology. By analyzing and processing the sensed signals
Number can be used to determine whether a human body has been detected and further implement corresponding operations. The human body sensing module has broad application prospects in smart homes, security and other fields