A non-contact vital sign detection method based on phase comparison

Abstract

The invention proposes a non-contact vital sign detection method based on phase comparison, which includes: the signal source transmits two sinusoidal signals with the same amplitude, phase and frequency, and one of the signals is transmitted to the chest cavity through the transceiver antenna and then echoed to the amplitude and phase The comparison module, the other signal is directly input to the amplitude phase comparison module; the amplitude phase comparison module compares the phase difference and the amplitude difference of the two signals, and converts the change of the phase difference and the change of the amplitude difference into the change of the two voltages and outputs it; through The mathematical model obtains the relationship between the frequency and range of change of the two voltages and the frequency and intensity of respiration / heartbeat, and outputs the detected respiration / heartbeat.

Description

technical field [0001] The invention belongs to the field of non-contact vital sign monitoring, and in particular relates to a non-contact vital sign detection method based on phase comparison. Background technique [0002] Human vital signs detection is widely used in epidemic prevention and control, post-disaster search and rescue, smart home, vehicle safety and other fields. [0003] Traditional contact sensors have prominent problems in engineering, such as complex networking, inconvenient installation, and high cost. In the field of biosensing, wearable sensing technology is limited by wearable operations, and its practical use is also greatly restricted. On the other hand, visual perception technology is sensitive to light, so it is difficult to achieve high-precision micro-motion monitoring, and there are natural defects in dynamic monitoring; laser detection technology often requires scanning to achieve full-field perception, and has strict requirements on the use en...

AI Technical Summary

Problems solved by technology

In the field of general health and smart home, non-contact intelligent sensing provides a new way to solve aging and shortage of medical resources. At present, contact devices have certain safety hazards and wearing comfort for users. question

However, the traditional non-contact vital sign detection method is often costly and the equipment is relatively large, making it difficult to achieve miniaturization and light weight.

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