A capacitive electrode for detecting electrocardiographic signals of car drivers

Abstract

The invention discloses a capacitor electrode for detecting electrocardiogram signals of a motorist. The capacitor electrode for detecting the electrocardiogram signals of the motorist comprises a supporting component, a signal detecting component and a buffer component, wherein the supporting component is composed of a metal plate; the signal detecting component is composed of a double-sided PCB (printed circuit board) with a voltage snubber circuit, the voltage snubber circuit is arranged on the bottom surface of the PCB and comprises CMOS (Complementary Metal-Oxide-Semiconductor Transistor) type double precision operational amplifiers with high input impedance and low noise; and the buffer component is composed of springs and is used for connecting the supporting component and the signal detecting component. The capacitor electrode for detecting the electrocardiogram signals of the motorist utilizes the double-sided PCB as the signal detecting component so that the structure is simple and the cost is low; utilizes springs as the buffer component so that the motion artifact caused by the body movement of a detected object during a signal detecting process is effectively restrained; and utilizes the mental plate as the supporting component so that not only a supporting function is achieved, but also an electromagnetic shielding function for the signal detecting component is achieved.

Description

technical field [0001] The invention belongs to the technical field of bioelectric signal detection and relates to a capacitive electrode used for detecting electrocardiographic signals of automobile drivers. Background technique [0002] By monitoring the ECG signal of the car driver, the degree of fatigue can be detected, thereby preventing fatigue driving. Traditional ECG detection methods mostly use metal electrodes to directly contact the skin of the subject to obtain signals, but the particularity of the driving environment does not allow this traditional detection method. [0003] In recent years, non-contact ECG detection technology has begun to develop rapidly, so that ECG signals can be detected without touching the subject's skin. Non-contact ECG detection technology uses the principle of capacitive coupling to detect ECG signals in the form of displacement current. [0004] Such as figure 1 Shown is a schematic diagram of non-contact ECG detection. The capaci...

AI Technical Summary

Problems solved by technology

The first method greatly increases the production cost of the capacitor electrode; the second method makes the circuit structure of the capacitor electrode complicated, and too many electronic devices will introduce a lot of noise. If the design is unreasonable, it will reduce the impedance of the capacitor electrode. interference performance; the third method makes the mechanical structure of the capacitive electrode complicated, which greatly affects the application flexibility of the capacitive electrode

In addition, most of the existing capacitive electrode designs only include signal detection components without buffer components. When used for signal detection, the capacitive electrodes are fixed and cannot be moved, and slight movement of the measured object’s body will cause obvious motion artifacts. film

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