WO2021147902A1

WO2021147902A1 - Multi-channel based skin resistance measuring device and method

Info

Publication number: WO2021147902A1
Application number: PCT/CN2021/072878
Authority: WO
Inventors: 赵起超; 杨苒
Original assignee: 北京津发科技股份有限公司
Priority date: 2020-01-20
Filing date: 2021-01-20
Publication date: 2021-07-29

Abstract

A multi-channel based skin resistance measuring device, comprising: a plurality of electrode sets (100), each of which comprises a plurality of electrodes (101, 102, 103, 104, 105) used for forming a plurality of skin resistance measuring channels so as to acquire skin resistance change signals of different parts of a human body; a path selector (200), which is connected to the plurality of electrode sets (100) and is used for selecting and conducting one electrode set of the plurality of electrode sets (100); and a proportional operation circuit (300) used for receiving skin resistance change signals measured by the electrode set (100) selected by the path selector and amplifying the received signals. The proportional operation circuit (300) comprises a first branch connected in series with the plurality of skin resistance measuring channels and a second branch connected in parallel with the first branch, wherein the first branch comprises a first input impedance, and the second branch comprises two second resistances, a voltage value between two second input impedances being half of a driving voltage among the resistance measuring channels. The present invention further relates to a multi-channel based skin resistance measuring method.

Description

Multi-channel-based skin resistance measuring device and measuring method

Technical field

This application relates to the technical field of skin resistance measurement, and in particular to a multi-channel skin resistance measurement device and measurement method.

Background technique

With the rapid development of social economy, social pressure has caused different levels of psychological distress to people. Studying the relationship between human skin resistance signals and emotions can not only help people better improve their mental state, timely intervention and To correct one's own mental problems, at the same time, this research can also be used to study the driving state of the driver, the business's understanding of the shoppers' points of interest, etc. It has very important value for promoting the research of human factors engineering.

At present, all methods of measuring skin resistance in the prior art are based on two-point measurement of fingers or palms, that is, a pair of electrodes are placed on the skin surface, a voltage is applied, and the skin resistance between the two electrodes is measured. This measurement method has very strict requirements on the part, and the measurement accuracy is not accurate enough. Especially in some scientific research fields, when the subject's finger or palm is occupied by other equipment, the skin resistance measurement cannot be performed. In addition, some devices in the prior art use the skin resistance collection at two points on the wrist, and their measurement accuracy is far less than that on the fingers. This is because the sweat glands on the human wrist are better than the sweat glands on the fingers. Underdeveloped, when the mood fluctuates, the skin impedance of the finger part is more obvious.

Therefore, how to achieve higher-precision skin resistance measurement is a problem to be solved.

Summary of the invention

In order to solve the problems in the prior art, the purpose of this application is to provide a multi-channel-based skin resistance measurement device and a measurement method, so as to achieve a higher-precision skin resistance measurement.

According to an aspect of the present application, a multi-channel-based skin resistance measurement device is provided, the device comprising:

Multiple electrode groups, each electrode group including multiple electrodes for forming multiple skin resistance measurement channels to obtain signals of changes in skin resistance in different parts of the human body;

Path selector, connected to multiple electrode groups, used to select one of the multiple electrode groups for selection and conduction;

A proportional calculation circuit for receiving a skin resistance change signal measured by an electrode group selected by the path selector, and amplifying the received signal; the proportional calculation circuit includes a first one connected in series with a plurality of skin resistance measurement channels And the second branch connected in parallel with the first branch, the first branch contains the first input impedance, the second branch contains two second input impedances, and the voltage value between the two second input impedances It is half of the driving voltage between the resistance measurement channels.

In an optional embodiment, the electrode group includes n electrodes, and the n electrodes form n-1 channels.

In an optional embodiment, the device further includes: a control unit connected to the path selector and configured to control the path selector based on the measurement signal of the proportional operation circuit.

In an optional embodiment, the device further includes an A/D converter, which is placed between the proportional arithmetic circuit and the control unit, and is used to convert the analog signal output by the proportional arithmetic circuit into a digital signal and indicate To the control unit.

In an optional embodiment, the number of electrodes in the plurality of electrode groups is the same or different.

In an optional embodiment, the device further includes a signal processor, which performs data superposition on the signals collected by each channel.

In an optional embodiment, the skin resistance after data superposition of the signals collected by n channels is increased to 2n times the skin resistance collected by a single channel.

In an optional embodiment, the device further includes a constant voltage power supply for voltage driving each electrode in each electrode group.

The multi-channel skin resistance measurement device provided in the present application creates a multi-channel compensation single-channel measurement of skin resistance on the basis of a single channel, the problem of inaccurate measurement accuracy caused by the underdeveloped sweat glands of the body part where the electrode is located.

The multi-channel-based skin resistance measurement device provided by the present application is used as the skin resistance value of the test point after the signal data collected by the multi-channel is superimposed, so that the multi-channel measurement can maximize the accuracy of data sampling.

This application provides a multi-channel skin resistance measurement device, which constructs an arithmetic circuit for each of the multiple channels formed by the electrode group, collects the data of each channel, and superimposes the data of the multiple channels to make the measured skin electronic The impedance changes the most, which improves the accuracy of data sampling to the greatest extent.

This application provides a multi-channel skin resistance measurement device, which constructs an arithmetic circuit for each of the multiple channels formed by an electrode group, introduces negative feedback in the arithmetic circuit, improves the sensitivity of the detection circuit, and makes the skin resistance The accuracy and sensitivity of the measuring circuit are greatly improved.

According to another aspect of the present application, there is provided a skin resistance measurement method based on a multi-channel skin resistance device. The device includes a plurality of electrode groups and a path selector, and each electrode group of the plurality of electrode groups includes a plurality of Electrodes are used to form multiple skin resistance measurement channels to obtain signals of skin resistance changes in different parts of the human body; the path selector is connected to multiple electrode groups and is used to select one of the multiple electrode groups for selection and conduction; ratio The arithmetic circuit is used to receive the skin resistance change signal measured by an electrode group selected by the path selector, and amplify the received signal; the proportional arithmetic circuit includes a first branch connected in series with a plurality of skin resistance measurement channels, and A second branch connected in parallel with the first branch, the first branch contains the first input impedance, the second branch contains two second input impedances, and the voltage between the two second input impedances is a resistance Half of the driving voltage between measurement channels;

The method includes the following steps:

Use the path selector to select an electrode group to obtain the signals of skin resistance changes in different parts of the human body;

For the signals measured by the multiple channels in the electrode group selected by the path selector, the data of the skin resistance change signals calculated by each channel are superimposed, and the proportional operation circuit is used for amplification.

In an optional embodiment, the constructed arithmetic circuit includes a first input impedance and two second input impedances connected in series;

The resistance values of the two second input impedances are the same, and the first input impedance is connected in parallel with the two second input impedances connected in series.

In an optional embodiment, the method further includes converting the analog signal output by the proportional operation circuit into a digital signal.

In an optional embodiment, the number of electrodes in the multiple electrode groups is the same or different.

In an optional embodiment, the plurality of electrode groups have different shapes and contact modes with human skin.

In an optional embodiment, after the path selector selects an electrode group, a constant voltage power supply is used to drive each channel of the electrode group.

In an optional embodiment, the skin resistance after data superposition of the signals collected by n channels is increased to 2 ⁿ times the skin resistance collected by a single channel.

This application provides a method for measuring skin resistance based on multiple channels. When a single channel is created based on a single channel to compensate the single channel for measuring skin resistance, the problem of inaccurate measurement accuracy due to underdeveloped sweat glands on the body part where the electrode is located.

This application provides a method for measuring skin resistance based on multi-channels. After the signal data collected by the multi-channels are superimposed, they are used as the skin resistance value of the test point, so that the multi-channel measurement can maximize the accuracy of data sampling.

This application provides a multi-channel skin resistance measurement method, which constructs an arithmetic circuit for each of the multiple channels formed by the electrode group, collects the data of each channel, and superimposes the data of the multiple channels to make the measured skin electronic The impedance changes the most, which improves the accuracy of data sampling to the greatest extent.

This application provides a multi-channel skin resistance measurement method. An arithmetic circuit is constructed for each of the multiple channels formed by an electrode group, and negative feedback is introduced in the arithmetic circuit to improve the sensitivity of the detection circuit and make the skin resistance The accuracy and sensitivity of the measuring circuit are greatly improved.

It should be understood that the foregoing general description and the subsequent detailed description are exemplary descriptions and explanations, and should not be used as a limitation on the content claimed in this application.

Description of the drawings

With reference to the accompanying drawings, more purposes, functions and advantages of this application will be clarified by the following description of the implementation of this application, in which:

Fig. 1 is a schematic structural diagram of a multi-channel skin resistance measuring device in an embodiment of the present application.

Fig. 2 is a schematic diagram of multiple channels of a multi-channel skin resistance measurement device in an embodiment of the present application.

Fig. 3 is a schematic diagram of an arithmetic circuit of one of the multiple channels of the multi-channel-based skin resistance measurement device in an embodiment of the present application.

Fig. 4 is a flowchart of a method for measuring skin resistance based on multi-channels in an embodiment of the present application.

Detailed ways

Please give further details. Here, the exemplary embodiments of the application and the description thereof are used to explain the application, but are not intended to limit the application.

Here, it should also be noted that, in order to avoid obscuring the application due to unnecessary details, only the structure and/or processing steps closely related to the solution according to the application are shown in the drawings, and the Other details that are not relevant to this application.

It should be emphasized that the term "include/include/have" when used herein refers to the existence of features, elements, steps or components, but does not exclude the existence or addition of one or more other features, elements, steps or components.

This application provides a method and device for measuring skin resistance based on multi-channels, which use multi-channel galvanic compensation methods to achieve high-precision measurements on different parts of the human body, such as the wrist and other parts of the body, such as the forehead. High-precision electrical skin measurement of cheeks, arms and other parts.

The following provides a detailed explanation of the multi-channel-based skin resistance measurement device and measurement method provided in the present application through specific examples. As shown in FIG. 1, a schematic diagram of the structure of a multi-channel-based skin resistance measurement device in an embodiment of the present application. According to an embodiment of the present application, the multi-channel-based skin resistance measurement device includes: a plurality of electrode groups 100, and a plurality of electrodes The group 100 is respectively connected to the path selector 200, the path selector 200 is connected to the proportional calculation circuit 300, the proportional calculation circuit 300 is connected to the A/D converter 400, and the A/D converter 400 is connected to the control unit 500.

The plurality of electrode groups 100 are all connected to the path selector 200, and the path selector 300 is used to select the plurality of electrode groups 100, that is, to select one electrode group of the plurality of electrode groups 100 to conduct conduction and use.

The proportional arithmetic circuit 300 is used to receive a signal measured by an electrode group 100 selected by the path selector, and amplify the received signal. The proportional arithmetic circuit 300 will be described in detail later. In one embodiment, the proportional operation circuit includes a first branch connected in series with a plurality of skin resistance measurement channels and a second branch connected in parallel with the first branch. The first branch includes a first input impedance, and the second branch The circuit contains two second input impedances, and the voltage between the two second input impedances is half of the driving voltage between the resistance measurement channels.

The A/D converter 400 is used to convert the analog signal output by the proportional operation circuit 300 into a digital signal, and the A/D converter 400 is connected to the control unit 500 for outputting the output digital signal to the control unit.

The control unit 500 is used to control the path selector 200 based on the received digital signal from the A/D converter 400.

In an embodiment of the present application, the measurement device may further include a signal processor. The A/D converter converts the collected signal into a data signal and transmits it to the signal processor. The signal processor performs data superposition on the signals collected by each channel.

According to an embodiment of the present application, each electrode group includes a plurality of electrodes, and the plurality of electrodes are used to form multiple channels to obtain signals of changes in skin resistance of different parts of the human body.

According to the embodiment of the present application, each electrode group may include, for example, n electrodes. The n electrodes form n-1 channels, and n is an integer greater than or equal to 3. For different electrode groups, the value of n may be different. Among the n electrodes, one electric level is a common electric level, and the other n-1 electrodes are driving electrodes. The common electrode and each driving electrode are used as a pair of electrodes to form a measurement channel for collecting voltage signals. Figure 2 is a schematic diagram of a multi-channel skin resistance measurement device based on a multi-channel in an embodiment of the application. There are a total of 5 electrodes in an electrode group, namely, the electrode 101, the electrode 102, the electrode 103, the electrode 104, and the electrode 105. The electrode 105 is a common electrical level, and 5 electrode groups form 4 channels. The 4 channels respectively collect the signals of the resistance changes of different skin parts of the human body. For example, the 4 channels respectively collect the signals of the resistance changes of the first skin resistance Rskin1, the second skin resistance Rskin2, the third skin resistance Rskin3, and the fourth skin resistance Rskin4. In the embodiment of the present application, a constant voltage is applied between the driving electrode and the common electrode of the electrode group selected by the path selector. Therefore, in one embodiment, the measuring device further includes a constant voltage power supply for applying a driving voltage between the electrodes. As shown in FIG. 2, in an electrode group, the driving electrodes 101, the electrodes 102, the electrodes 103, the electrodes 104 and the common electrode 105 are all driven by a constant voltage power supply.

During the measurement, five electrodes are attached to the human skin, and the signals of the skin resistance changes of each channel are measured and collected at the same time. By superimposing the measured multi-channel data after the arithmetic circuit, the impedance change value can be larger when measuring the skin voltage. After the multi-channel data is superimposed, the collected data waveform is enlarged and the waveform becomes steep. Multi-channel testing can maximize the accuracy of data sampling.

The proportional arithmetic circuit is used to amplify the signal detected by the conductive electrode group 100. In the embodiment of the present application, a circuit model related to the resistance is established for the resistance between the two points where the skin contacts the electrode. Based on the resistance model, a proportional arithmetic circuit is constructed. FIG. 3 is a schematic diagram of a circuit model embodying related resistances of a proportional operation circuit in an embodiment of the application. Figure 3 only shows a single-channel measurement of skin electricity, and skin resistance is only a part of the entire circuit. This single-channel circuit principle is applicable to each of the multiple channels shown in FIG. 2. Therefore, the description will be made by taking a single channel as the first channel in FIG. 2 as an example.

The proportional operation circuit in Figure 3 includes a first branch (branch of R1) connected in series with multiple skin resistance measurement channels and a second branch (branch where the second input impedance R2 is located) in parallel with the first branch. , The first branch contains a first input impedance R1, the second branch contains two second input impedances R2, and the voltage between the two second input impedances is half of the driving voltage between the resistance measurement channels , Which is Xs1/2.

In the constructed circuit model, the known quantities are Xs1, R1, R2, and Xs3 can be obtained at the output, where Xs3 is the value measured by the proportional operation circuit, which is a known quantity. R1 and R2 are fixed resistance values in the proportional operation circuit, and the first input impedance R1 is the input impedance of an amplifier circuit.

In order to collect _{the resistance signal of the first skin resistance R skin1} , the input voltage at the input terminal of the proportional operation circuit is the voltage Xs2 at the output side of the skin resistance, and the output terminal of the proportional operation circuit outputs the measured voltage Xs3. The driving voltage Xs1 is applied between the electrode 105 and the electrode 101 as the voltage applied across the first skin resistor R skin1, and at the same time, a voltage of _{Xs 1/2 is applied between the two R2s.}

In the embodiment of the present application, Xs1, R1, and R2 are all known quantities, and Xs3 measured at the output end is also a known quantity.

The model satisfies the following equations:

(Xs1-Xs2)/R _Skin1 = (Xs2-Xs3)/R1 (1)

(Xs2-Xs1/2)/R2=(Xs1/2-Xs3)/R2 (2)

The above equations can be _{combined to} obtain the values of R Skin1 and Xs2, so as to solve the change value _{of the first skin resistance R Skin1.}

Based on the above principles, the embodiment of the present application creates multiple channels on a single-channel model, and superimposes the multi-channel data to compensate for inaccurate measurement accuracy caused by underdeveloped sweat glands on the part of the human body where the electrodes are located when the single-channel skin is measured. .

In the case of multiple channels, the skin resistance change signal in one channel is measured when the subject’s mood fluctuates, and multiple skin resistance change signals are collected through multiple channels. The above multi-channel data superimposition method improves the collection The accuracy of skin resistance.

According to the embodiment of the present application, an operational amplifier is used to build a proportional operation circuit. In the circuit example shown in FIG. 3, except for Rskin1, an operational amplifier is formed as a whole. At the same time, negative feedback is introduced into the circuit. For example, the arithmetic circuit into the measurement voltage is a negative feedback, the example of FIG. 3, the measured voltage Xs3 back to the input before ₁ R negative feedback for improving the sensitivity of the detection circuit, and because the arithmetic circuit itself impedance approaching infinity Yes, the accuracy and sensitivity of the skin resistance measurement circuit have been greatly improved.

According to the embodiment of the present application, the skin resistance after data superposition of the signals collected by n channels is used as the skin resistance value of the test point. Compared with the skin resistance measurement collected by a single channel, the obtained skin resistance data will be increased to 2 ⁿ times . For example, suppose that the resistance value of the skin resistance of one of the 4 channels is 1 ohm, and the impedance change value is 1 ohm when the subject's mood fluctuates, then the skin resistance changes from 1 ohm to 2 when the channel is collected. Europe. The skin resistance of the signals collected by multiple channels after data superposition is increased to 2 ⁿ times that of the skin resistance of a single channel, where n is the number of channels. According to the embodiment of the present application, the resistance value of the skin resistance collected by the above 4 channels will be increased to 16 Europe. Therefore, in areas with underdeveloped sweat glands or poor contact, multi-channel testing can maximize the accuracy of data sampling.

In addition, in the embodiment of the present application, the controller controls the path selector 200 based on the output of the A/D converter 400, for example, controls the path selector 200 to select which group of a plurality of electrode groups.

In the multi-channel-based skin resistance measurement device and measurement method provided in this application, the multi-channel data is superimposed, so that the impedance change value is greater when measuring the electrical skin. The multi-channel data is superimposed, and the collected data waveform is enlarged. Steep, multi-channel testing can maximize the accuracy of data sampling. In areas with underdeveloped sweat glands or poor contact, multi-channel testing can maximize the accuracy of data sampling.

In some embodiments, in order to be portable and used in different parts, the multiple electrode groups can have different forms and shapes, for example, an electrode group composed of multiple electrodes is attached to the skin in a patch, or composed of multiple electrodes. Another electrode group is wrapped around the finger in a finger buckle style, or another electrode group composed of a plurality of electrodes presses the finger on the metal sheet in the form of a long metal sheet for measurement.

In the multi-channel-based skin resistance measurement device and measurement method provided in the present application, there are multiple electrodes in an electrode group, and the multiple electrodes form multiple channels, and the multiple electrodes are attached or contacted on the human skin in other forms. Because there are multiple electrodes, it is better to select multiple parts of the human body with more developed sweat glands for measurement, making the measurement of skin resistance changes more sensitive when the subject’s mood changes, and because multiple electrodes form multiple channels Therefore, more skin data are collected by measurement, which makes the detection result more accurate.

The multi-channel-based skin resistance measurement device and measurement method provided in this application can realize skin resistance collection in different parts and in different ways, and can also adapt the skin resistance measurement to the actual needs of the measurement at the time, such as when the subject needs to be liberated. When using both hands, you can choose not to perform skin resistance measurement on the subject’s finger, but to perform skin resistance measurement by attaching a patch to the body part other than the hand, which is convenient for the subject to use both hands for other tasks when performing skin resistance measurement. Interfere with skin resistance measurement.

In the multi-channel-based skin resistance measurement device and measurement method provided in the present application, when a multi-channel compensation single-channel measurement of skin resistance is created on the basis of a single channel, the measurement accuracy of the body part where the electrode is located is not accurate due to underdeveloped sweat glands. The problem.

In the multi-channel-based skin resistance measurement device and measurement method provided by the present application, the signal data collected through the multi-channels is superimposed and used as the skin resistance value of the test point, so that the multi-channel measurement can maximize the data sampling performance. accuracy.

The following describes a multi-channel skin resistance measurement method based on specific embodiments. FIG. 4 is a flow chart of the multi-channel skin resistance measurement method in an embodiment of this application. The skin resistance measurement method includes the following method steps:

Step S101: Set up a multi-channel skin resistance measurement device.

Multiple electrodes constitute an electrode group, and multiple channels are formed between the multiple electrodes. A plurality of electrode groups are respectively connected to a path selector, and the plurality of electrode groups are selected by the path selector. The path selector is connected to the proportional calculation circuit, the proportional calculation circuit is connected to the A/D converter, and the A/D converter is connected to the control unit. The control unit is also connected to the path selector 200 for controlling the path selector.

According to the embodiment of the present application, the electrode group includes n electrodes, the n electrodes form n-1 channels, and each channel constructs an arithmetic circuit. In the embodiment, an electrode group composed of 5 electrodes is taken as an example, and the 5 electrode groups form 4 channels. The 4 channels respectively collect the signals of the resistance changes of different skin parts of the human body. For example, the 4 channels respectively collect the signals of the resistance changes of the first skin resistance Rskin1, the second skin resistance Rskin2, the third skin resistance Rskin3, and the fourth skin resistance Rskin4.

Step S102: Select an electrode group to obtain signals of skin resistance changes in different parts of the human body.

According to the embodiment of the present application, during the measurement, the five electrodes are attached to the epidermis of the human body, and the signals of the skin resistance change of each channel are measured and collected. According to the embodiment of the present application, the A/D converter converts the collected signal into a data signal and transmits it to the signal processor.

Step S103, each channel in the electrode group calculates a signal of skin resistance change by constructing an arithmetic circuit.

In the embodiment of the application, the arithmetic circuit constructed by measuring the channel of the first skin resistance Rskin1 as an example, the arithmetic circuit constructed includes a first input impedance R1, two second input impedances R2 connected in series, and two second input impedances R2. The resistances are the same, the first input impedance R1 is connected in parallel with the two second resistors R2 connected in series, and the first input impedance R1 is the input impedance of an amplifier circuit.

In order to collect the resistance signal of the first skin resistance Rskin1, the output voltage Xs2 of the skin resistance is input at the input terminal of the arithmetic circuit, and the measured voltage Xs3 is output at the output terminal of the arithmetic circuit. By applying the driving voltage Xs1 to the electrode 105 and the electrode 101, a voltage is applied across the first skin resistance Rskin1.

In the embodiment, Xs1 is the applied driving voltage, R1, R2 are fixed resistance values in the proportional operation circuit, Xs1, R1, R2 are all known quantities, and Xs3 measured at the output terminal is also a known quantity.

Xs1, Xs2, and Xs3 are the voltages in the arithmetic circuit, the input voltages applied by Xs1, and Xs2 and Xs3 are the output voltages.

Establish the following equation to calculate the change value of the first skin resistance:

(Xs1-Xs2)/RSkin1=(Xs2-Xs3)/R1 (1)

(Xs2-Xs1/2)/R2=(Xs1/2-Xs3)/R2 (2)

The above equations are combined to obtain the values of RSkin1 and Xs2, and the change value of the first skin resistance RSkin1 is solved.

Step S104: Use the signal processor to perform data superposition on the signals collected by each channel.

According to the embodiment of the present application, the skin resistance after data superposition of the signals collected by n channels is used as the skin resistance value of the test point, which is increased to 2 ⁿ times the skin resistance when collected by a single channel. For example, if the resistance value of the skin resistance of one of the 4 channels is 1 ohm, and the impedance change value is 1 ohm when the subject's mood fluctuates, then the skin resistance will change from 1 ohm to 2 when the channel is collected. Europe. The skin resistance of the signals collected by multiple channels after the data is added is increased to 2 ⁿ times the skin resistance of a single channel, where n is the number of channels. According to the embodiment of the present application, the resistance value of the skin resistance collected by the above 4 channels will be increased to 16 euros.

In the multi-channel-based skin resistance measurement device and measurement method provided by this application, an arithmetic circuit is constructed for each of the multiple channels formed by the electrode group, the data of each channel is collected, and the data of the multiple channels are superimposed to make the measurement The impedance of the skin electronics has the largest change, which maximizes the accuracy of data sampling.

In the multi-channel-based skin resistance measurement device and measurement method provided in the present application, an arithmetic circuit is constructed for each of the multiple channels formed by the electrode group, and negative feedback is introduced in the arithmetic circuit to improve the sensitivity of the detection circuit , So that the accuracy and sensitivity of the skin resistance measurement circuit are greatly improved.

In this application, the features described and/or exemplified for one embodiment can be used in the same way or in a similar way in one or more other embodiments, and/or be combined with the features of other embodiments or replace other embodiments. Features of the embodiment.

In combination with the description and practice of the application disclosed here, other embodiments of the application are easily thought of and understood by those skilled in the art. The descriptions and examples are only considered exemplary, and the true scope and spirit of the application are defined by the claims.

Claims

A multi-channel-based skin resistance measuring device, characterized in that, the device comprises:

Multiple electrode groups, each electrode group including multiple electrodes for forming multiple skin resistance measurement channels to obtain signals of changes in skin resistance in different parts of the human body;

Path selector, connected to multiple electrode groups, used to select one of the multiple electrode groups for selection and conduction;

A proportional calculation circuit for receiving a skin resistance change signal measured by an electrode group selected by the path selector, and amplifying the received signal; the proportional calculation circuit includes a first one connected in series with a plurality of skin resistance measurement channels And the second branch connected in parallel with the first branch, the first branch contains the first input impedance, the second branch contains two second input impedances, and the voltage value between the two second input impedances It is half of the driving voltage between the resistance measurement channels.
The device according to claim 1, wherein the electrode group includes n electrodes, and the n electrodes form n-1 channels.
The device according to claim 2, wherein the device further comprises:

The control unit is connected to the path selector, and is used to control the path selector based on the measurement signal of the proportional operation circuit.
The device according to claim 3, wherein the device further comprises an A/D converter, which is placed between the proportional operation circuit and the control unit, and is used to convert the analog signal output by the proportional operation circuit into The digital signal is also pointed to the control unit.
The device according to claim 1, wherein the number of electrodes in the multiple electrode groups is the same or different.
The device according to claim 1, wherein the plurality of electrode groups have different shapes and contact modes with human skin.
The device according to claim 1, wherein the device further comprises a signal processor, which performs data superposition on the signals collected by each channel.
The device according to claim 6, wherein the skin resistance after data superposition of the signals collected by n channels is increased to 2n times of the skin resistance collected by a single channel.
The device according to claim 1, wherein the device further comprises a constant voltage power supply for voltage driving a plurality of channels.
A method for measuring skin resistance based on multiple channels, characterized in that the device includes a plurality of electrode groups and a path selector, and each electrode group in the plurality of electrode groups includes a plurality of electrodes for forming a plurality of skin resistances Measurement channels to obtain signals of changes in skin resistance in different parts of the human body; the path selector is connected to multiple electrode groups, and is used to select one of the multiple electrode groups for selection and conduction; the proportional operation circuit is used to receive the signal of the path selector. The skin resistance change signal measured by a selected electrode group is amplified, and the received signal is amplified; the proportional operation circuit includes a first branch connected in series with a plurality of skin resistance measurement channels and a second branch connected in parallel with the first branch. Branch, the first branch contains the first input impedance, the second branch contains two second input impedances, and the voltage between the two second input impedances is half of the driving voltage between the resistance measurement channels ；

The method includes the following steps:

Use the path selector to select an electrode group to obtain the signals of the skin resistance changes in different parts of the human body;

For the signals measured by multiple channels in the electrode group selected by the path selector, the data of the skin resistance change signals calculated by each channel are superimposed, and the proportional operation circuit is used for amplification.
The method according to claim 10, wherein the method further comprises controlling the path selector based on the measurement signal of the proportional operation circuit.
The method according to claim 10, wherein the method further comprises: converting the analog signal output by the proportional operation circuit into a digital signal.
The method according to claim 10, wherein the electrode group includes n electrodes, and the n electrodes form n-1 channels.
The method according to claim 10, wherein the number of electrodes in the multiple electrode groups is the same or different.
The method according to claim 10, wherein the plurality of electrode groups have different shapes and contact modes with human skin.
The method according to claim 10, wherein after the path selector selects an electrode group, a constant voltage power supply is used to drive each channel of the electrode group.
The method according to claim 10, wherein the device further comprises a signal processor, which performs data superposition on the signals collected by each channel.
The method according to claim 13, wherein the skin resistance after data superposition of the signals collected by n channels is increased to 2 n times the skin resistance collected by a single channel.