CN111227848B - Skin resistance measuring device based on multiple channels - Google Patents
Skin resistance measuring device based on multiple channels Download PDFInfo
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- CN111227848B CN111227848B CN202010066013.4A CN202010066013A CN111227848B CN 111227848 B CN111227848 B CN 111227848B CN 202010066013 A CN202010066013 A CN 202010066013A CN 111227848 B CN111227848 B CN 111227848B
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- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/16—Devices for psychotechnics; Testing reaction times ; Devices for evaluating the psychological state
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- A—HUMAN NECESSITIES
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- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
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Abstract
The invention provides a skin resistance measuring device based on multiple channels, which comprises: the device comprises a plurality of electrode groups, a plurality of sensors and a plurality of sensors, wherein each electrode group comprises a plurality of electrodes and is used for forming a plurality of skin resistance measuring channels so as to acquire signals of skin resistance changes of different parts of a human body; a path selector connected to the plurality of electrode groups, for selecting one of the plurality of electrode groups to be selected and turned on; the proportional operation circuit is used for receiving a skin resistance change signal measured by one electrode group selected by the path selector and amplifying the received signal; the proportional operation circuit comprises a first branch circuit and a second branch circuit, wherein the first branch circuit is connected with the skin resistance measurement channels in series, the second branch circuit is connected with the first branch circuit in parallel, the first branch circuit comprises a first input impedance, the second branch circuit comprises two second resistors, and the voltage value between the two second input impedances is half of the driving voltage between the resistance measurement channels. The invention can improve the accuracy of data sampling.
Description
Technical Field
The invention relates to the technical field of skin resistance measurement, in particular to a skin resistance measuring device based on multiple channels.
Background
With the rapid development of social economy, social pressure causes psychological troubles to people in different degrees, the research on the relationship between skin resistance signals and emotion of people can help people to better improve the psychological state of people and intervene and correct the psychological problems of people in time, and meanwhile, the research can be applied to the aspects of researching the driving state of a driver, understanding of a merchant on the points of interest of a shopper and the like, and has very important value for promoting the research of human factors engineering.
At present, all the methods for measuring the skin resistance in the prior art are based on two points of the finger or palm, that is, a pair of electrodes is placed on the surface of the skin, a voltage is applied, and the skin resistance between the two electrodes is measured. The measurement mode has strict requirements on parts, the measurement precision is not accurate enough, and particularly in some scientific research fields, when the tested finger or palm part is occupied by other equipment, the skin resistance cannot be measured. In addition, some devices in the prior art adopt skin resistance acquisition of two points at the wrist part, and the measurement accuracy is far lower than that of the devices on the fingers, because the sweat glands of the wrist part of a human body are not developed compared with the sweat glands of the finger parts, and when the emotion fluctuates, the skin impedance of the finger parts is more obvious.
Therefore, how to realize higher-precision skin resistance measurement is a problem to be solved.
Disclosure of Invention
The invention aims to provide a skin resistance measuring device based on multiple channels so as to realize skin resistance measurement with higher precision.
The technical scheme of the invention is as follows:
a multi-channel based skin resistance measurement device, the device comprising:
the device comprises a plurality of electrode groups, a plurality of sensors and a plurality of sensors, wherein each electrode group comprises a plurality of electrodes and is used for forming a plurality of skin resistance measuring channels so as to acquire signals of skin resistance changes of different parts of a human body;
a path selector connected to the plurality of electrode groups, for selecting one of the plurality of electrode groups to be selected and turned on;
the proportional operation circuit is used for receiving a skin resistance change signal measured by one electrode group selected by the path selector and amplifying the received signal; the proportional operation circuit comprises a first branch circuit and a second branch circuit, wherein the first branch circuit is connected with the skin resistance measurement channels in series, the second branch circuit is connected with the first branch circuit in parallel, the first branch circuit comprises a first input impedance, the second branch circuit comprises two second input impedances, and the voltage value between the two second input impedances is half of the driving voltage between the resistance measurement channels.
In an alternative embodiment, the set of electrodes comprises n electrodes, the n electrodes forming n-1 channels.
In an optional embodiment, the apparatus further comprises: and a control unit connected with the path selector and used for controlling the path selector based on the measurement signal of the proportional operation circuit.
In an alternative embodiment, the apparatus further comprises an a/D converter, interposed between the proportional operation circuit and the control unit, for converting the analog signal output from the proportional operation circuit into a digital signal and indicating it to the control unit.
In an alternative embodiment, the number of electrodes in the plurality of electrode sets is the same or different.
In an optional embodiment, the apparatus further comprises a signal processor for performing data superposition on the signals acquired by the channels.
In an alternative embodiment, the skin resistance of the signals acquired by the n channels after data superposition is increased to 2 of the skin resistance acquired by a single channelnAnd (4) doubling.
In an alternative embodiment, the apparatus further comprises a constant voltage power supply for voltage driving each electrode of each electrode group.
The skin resistance measuring device based on multiple channels provided by the invention has the advantage that when the skin resistance is measured by creating the multiple compensation single channels on the basis of the single channel, the measurement accuracy of the human body part where the electrode is located is inaccurate due to the undeveloped sweat glands.
According to the skin resistance measuring device based on multiple channels, signal data acquired by multiple channels are superposed to be used as the skin resistance value of the test point, so that the accuracy of data sampling can be improved to the greatest extent by the multi-channel measurement.
The skin resistance measuring device based on multiple channels provided by the invention has the advantages that an operation circuit is constructed for each channel in the multiple channels formed by the electrode group, the data of each channel is collected, the data of the multiple channels are overlapped, the impedance change of measured skin electrons is maximized, and the accuracy of data sampling is improved to the maximum extent.
According to the skin resistance measuring device based on multiple channels, an operation circuit is constructed for each channel in multiple channels formed by the electrode group, negative feedback is introduced into the operation circuit, the sensitivity of the detection circuit is improved, and the precision and the sensitivity of the skin resistance measuring circuit are greatly improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
Further objects, features and advantages of the present invention will become apparent from the following description of embodiments of the invention, with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural diagram of a skin resistance measuring device based on multiple channels in one embodiment of the invention.
FIG. 2 is a multi-channel schematic of a multi-channel based skin resistance measurement device in one embodiment of the invention.
FIG. 3 is a schematic diagram of an operational circuit of one of multiple channels of a multi-channel based skin resistance measurement device according to an embodiment of the present invention.
FIG. 4 is a block flow diagram of a multi-channel based skin resistance measurement method in one embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following embodiments and accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the scheme according to the present invention are shown in the drawings, and other details not so relevant to the present invention are omitted.
It should be emphasized that the term "comprises/comprising/comprises/having" when used herein, is taken to specify the presence of stated features, elements, steps or components, but does not preclude the presence or addition of one or more other features, elements, steps or components.
The invention provides a skin resistance measuring device based on multiple channels, which utilizes a multiple-channel skin resistance compensation method to realize high-precision measurement on different parts of a human body, such as the wrist and other parts of the body, such as the forehead, the cheek or the arm.
A detailed explanation of the multi-channel based skin resistance measurement device provided by the present invention is given below by way of specific examples. As shown in fig. 1, a schematic structural diagram of a multi-channel based skin resistance measuring apparatus according to an embodiment of the present invention includes: the plurality of electrode groups 100, the plurality of electrode groups 100 are respectively connected with the path selector 200, the path selector 200 is connected with the proportional operation circuit 300, the proportional operation circuit 300 is connected with the A/D converter 400, and the A/D converter 400 is connected with the control unit 500.
The plurality of electrode groups 100 are each 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 of the plurality of electrode groups 100 to be turned on and used.
The proportional operation circuit 300 is used for receiving a signal measured by one electrode group 100 selected by the path selector and amplifying the received signal, and the proportional operation circuit 300 will be described in detail later. In one embodiment, the proportional operation circuit comprises a first branch connected in series with the plurality of skin resistance measurement channels and a second branch connected in parallel with the first branch, the first branch comprises a first input impedance, the second branch comprises two second input impedances, and the voltage value between the two second input impedances is half of the driving voltage between the resistance measurement channels.
The a/D converter 400 is used for converting 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 and is used 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 digital signal received from the a/D converter 400.
In an embodiment of the present invention, the measuring apparatus may further include a signal processor, the a/D converter converts the acquired signals into data signals, and transmits the data signals to the signal processor, and the signal processor performs data superposition on the signals acquired by each channel.
According to the embodiment of the invention, each electrode group comprises a plurality of electrodes, and the plurality of electrodes are used for forming a plurality of channels and acquiring signals of skin resistance changes of different parts of a human body.
According to an embodiment of the present invention, each electrode group may include n electrodes, for example, the n electrodes form n-1 channels, n is an integer greater than or equal to 3, and the value of n may be different for different electrode groups. One electrode of the n electrodes is a public electrode, the other n-1 electrodes are driving electrodes, and the public electrode and each driving electrode are used as a pair of electrodes to form a channel for measuring and be used for collecting voltage signals. Fig. 2 is a multi-channel schematic diagram of a multi-channel-based skin resistance measuring device according to an embodiment of the present invention, in which the number of electrode groups is 5, that is, the electrode group is composed of an electrode 101, an electrode 102, an electrode 103, an electrode 104, and an electrode 105, the electrode 105 is a common electrode, and the 5 electrode groups form 4 channels. The 4 channels respectively acquire signals of resistance changes of different skin parts of a human body, for example, the 4 channels respectively acquire signals of resistance changes of a first skin resistor Rskin1, a second skin resistor Rskin2, a third skin resistor Rskin3 and a fourth skin resistor Rskin 4. In the embodiment of the invention, a constant voltage is applied between the drive electrode and the common electrode of the electrode group selected by the path selector. Thus, in one embodiment, the measuring device further comprises a constant voltage power supply for applying a drive voltage between the electrodes. As shown in fig. 2, in one electrode group, the driving electrodes 101, 102, 103, 104, and the common electrode 105 are all voltage-driven by a constant voltage power supply.
During measurement, 5 electrodes are respectively attached to the epidermis of a human body, and signals of skin resistance changes of all channels are measured and collected at the same time. By superposing the measured multi-channel data after the arithmetic circuit, the impedance change value is larger when the skin electricity is measured, and the acquired data waveform is enlarged and becomes steep after the multi-channel data are superposed. The multichannel test can improve the accuracy of data sampling to the greatest extent.
The proportional operation circuit is used for amplifying the signal detected by the conducting electrode group 100, in the embodiment of the present invention, a resistance value between two points of the skin contact electrode is used to establish a circuit model related to the resistance, and the proportional operation circuit is established on the basis of the resistance model. FIG. 3 is a diagram illustrating a resistance-related circuit model of a proportional operation circuit according to an embodiment of the present invention. Figure 3 shows only a single channel measurement of the skin current, the skin resistance being only a fraction of the total circuit. The circuit principle of the single channel is applied to each of the multiple channels shown in fig. 2. Therefore, the single channel will be described as the first channel in fig. 2.
The proportional operation circuit in fig. 3 includes a first branch (branch of R1) connected in series with the skin resistance measurement channels and a second branch (branch where the second input impedance R2 is located) connected in parallel with the first branch, the first branch includes a first input impedance R1, the second branch includes two second input impedances R2, and the voltage value between the two second input impedances is half of the driving voltage between the resistance measurement channels, that is, Xs 1/2.
The circuit model is constructed, the known quantities are Xs1, R1 and R2, and Xs3 can be obtained at the output end, wherein Xs3 is the value measured by the proportional operation circuit and is the known quantity. R1 and R2 are fixed resistances of the proportional operation circuit, wherein the first input impedance R1 is an input impedance of the amplifying circuit.
To acquire a first skin resistance Rskin1The input voltage of the input end of the proportional operation circuit is the voltage Xs2 of the output side of the skin resistor, and the output end of the proportional operation circuit outputs the measurement voltage Xs 3. By applying a driving voltage Xs1 between the electrode 105 and the electrode 101 as a first skin resistance Rskin1The voltage applied across the two terminals, and at the same time, a voltage of Xs1/2 is applied between the two R2.
In the embodiment of the invention, Xs1, R1 and R2 are all known quantities, and Xs3 measured at the output end is also known quantity.
The model satisfies the following equation:
(Xs1-Xs2)/RSkin1＝(Xs2-Xs3)/R1 (1)
(Xs2-Xs1/2)/R2＝(Xs1/2-Xs3)/R2 (2)
the above equation sets are combined to obtain RSkin1And Xs2Value, thereby solving for the first skin resistance RSkin1The variation value of (c).
Based on the principle, the embodiment of the invention creates multiple channels on the single-channel model, and compensates the situation of inaccurate measurement precision of the human body part where the electrode is located due to the undeveloped sweat glands and the like when the skin electricity is measured by the single channel through the superposition of the multiple channels of data.
Under the condition of multiple channels, signals of skin resistance changes in one channel are measured when the emotion of a tested person fluctuates, the signals of the skin resistance changes are collected through the multiple channels, and the accuracy of collecting the skin resistance is improved in the mode of overlapping the multiple channels of data.
According to the embodiment of the invention, a proportional operational circuit is built by using an operational amplifier, and in the circuit example shown in FIG. 3, the operational amplifier is integrally formed except Rskin 1. At the same time, negative feedback is introduced in the circuit. For example, negative feedback of the measured voltage is introduced into the arithmetic circuit, and in the example of fig. 3, the measured voltage Xs3 is fed back to R1The front input realizes negative feedback and is used for improving the sensitivity of the detection circuit, and simultaneously, the self impedance of the operation circuit is close to infinity, so that the precision and the sensitivity of the skin resistance measurement circuit are greatly improved.
According to the embodiment of the invention, the skin resistance obtained by data superposition of the signals acquired by the n channels is used as the skin resistance value of the test point, and compared with the skin resistance measurement acquired by a single channel, the obtained skin resistance data is improved to 2nAnd (4) doubling. For example, if the skin resistance of one of the 4 channels is 1 ohm, and the change value of the impedance is 1 ohm when the emotion of the subject fluctuates, the skin resistance is changed from 1 ohm to 2 ohm when the channel is collected. The skin resistance of signals acquired by a plurality of channels after data superposition is increased to 2 of the skin resistance of a single channelnAnd n is the number of channels, the resistance of the skin resistance of the 4-channel acquisition is increased to 16 ohms according to the embodiment of the invention. Therefore, in areas with undeveloped sweat glands or poor contact of contact points, the multichannel test can improve the accuracy of data sampling to the greatest extent.
Further, in the embodiment of the present invention, 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 one of a plurality of sets of electrode groups.
According to the skin resistance measuring device based on multiple channels, the impedance change value is larger when the skin electricity is measured through the data superposition of the multiple channels, the multiple channels of data are superposed, the waveform of the acquired data is enlarged, the waveform is steep, and the accuracy of data sampling can be improved to the greatest extent through the multi-channel test. In the areas with undeveloped sweat glands or poor contact of contact points, the multichannel test can improve the accuracy of data sampling to the greatest extent.
In some embodiments, the plurality of electrode sets may be different in form and shape for portability and use at different locations, such as one electrode set comprising a plurality of electrodes attached to the skin in a patch fashion, another electrode set comprising a plurality of electrodes wrapped around a finger in a finger-snap fashion, or another electrode set comprising a plurality of electrodes measured by pressing a finger against a metal sheet in a longer metal sheet.
The skin resistance measuring device based on multiple channels provided by the invention has the advantages that the multiple electrodes in one electrode group form multiple channels, the multiple electrodes are respectively attached to or contacted with the skin of a human body in other forms, the multiple electrodes are arranged, so that the parts with more developed sweat glands can be better selected for measurement at the local part of the human body, the measurement on the skin resistance change is more sensitive when the emotion of a tested person changes, and the skin resistance data acquired by measurement is more and the detection result is more accurate due to the multiple electrodes forming multiple channels.
The skin resistance measuring device based on multiple channels can realize skin resistance collection of different parts and different modes, and can also enable skin resistance measurement to be suitable for actual measurement needs at the time, for example, when the tested hands need to be liberated, skin resistance measurement can be carried out by attaching the skin resistance measuring device to human body parts except the hands in a surface mounting mode instead of carrying out skin resistance measurement on the tested fingers, so that the tested hands can be used for carrying out other work without interfering with skin resistance measurement when the skin resistance measurement is carried out.
The invention provides a skin resistance measuring device based on multiple channels, which solves the problem of inaccurate measuring precision of human body parts where electrodes are located due to undeveloped sweat glands when the skin resistance is measured by creating a multi-channel compensation single channel on the basis of a single channel.
According to the skin resistance measuring device based on multiple channels, signal data acquired by multiple channels are superposed to be used as the skin resistance value of the test point, so that the accuracy of data sampling can be improved to the greatest extent by the multi-channel measurement.
In the following, a skin resistance measurement method based on multiple channels is described with reference to specific embodiments, and as shown in fig. 4, a flow chart of the skin resistance measurement method based on multiple channels in an embodiment of the present invention is shown, and the skin resistance measurement method based on multiple channels includes the following steps:
and S101, building a skin resistance measuring device based on multiple channels.
A plurality of electrodes form an electrode group, and a plurality of channels are formed among the electrodes. The plurality of electrode groups are connected to a path selector, and the path selector selects the plurality of electrode groups. The path selector is connected with the proportional operation circuit, the proportional operation circuit is connected with the A/D converter, and the A/D converter is connected with the control unit. The control unit is also connected to a path selector 200 for controlling the path selector.
According to an embodiment of the invention, the set of electrodes comprises n electrodes forming n-1 channels, each channel building an operational circuit. In the embodiment, an electrode group consisting of 5 electrodes is taken as an example, and 4 passages are formed by the 5 electrode groups. The 4 channels respectively acquire signals of resistance changes of different skin parts of a human body, for example, the 4 channels respectively acquire signals of resistance changes of a first skin resistor Rskin1, a second skin resistor Rskin2, a third skin resistor Rskin3 and a fourth skin resistor Rskin 4.
Step S102, selecting an electrode group to obtain signals of skin resistance changes of different parts of a human body.
According to the embodiment of the invention, during measurement, 5 electrodes are respectively attached to the epidermis of a human body, and signals of skin resistance changes of all channels are measured and collected. According to the embodiment of the invention, the A/D converter converts the collected signals into data signals and transmits the data signals to the signal processor.
Step S103, calculating a skin resistance change signal through constructing an arithmetic circuit for each channel in the electrode group.
In the embodiment of the present invention, the arithmetic circuit is constructed by taking a channel for measuring the first skin resistance Rskin1 as an example, the constructed arithmetic circuit includes a first input impedance R1, two second input impedances R2 connected in series, the two second input impedances R2 have the same resistance value, 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 an input impedance of an amplifying circuit.
In order to acquire a resistance value signal of the first skin resistor Rskin1, the input end of the arithmetic circuit inputs the output voltage Xs2 of the skin resistor, and the output end of the arithmetic circuit outputs a measurement voltage Xs 3. The application of a voltage across the first skin resistance Rskin1 is achieved by applying a drive voltage Xs1 to electrodes 105 and 101.
In the embodiment, Xs1 is the applied driving voltage R1, R2 is the fixed resistance value of the proportional operation circuit, Xs1, R1 and R2 are all known quantities, and Xs3 measured at the output end is also known quantity.
Xs1, Xs2, and Xs3 calculate voltages in the circuit, an input voltage applied to Xs1, and Xs2 and Xs3 are output voltages.
The change value of the first skin resistance is calculated by establishing the following equation:
(Xs1-Xs2)/RSkin1＝(Xs2-Xs3)/R1 (1)
(Xs2-Xs1/2)/R2＝(Xs1/2-Xs3)/R2 (2)
the values of RSkin1 and Xs2 are obtained by combining the above equations, so that the variation value of the first skin resistance RSkin1 is solved.
And step S104, performing data superposition on the signals acquired by each channel by using a signal processor.
According to the embodiment of the invention, the skin resistance of the signals acquired by the n channels after data superposition is used as the skin resistance of the test point and is improved to be singleResistance of skin at individual channel acquisition 2nAnd (4) doubling. For example, if the skin resistance of one of the 4 channels is 1 ohm, and the change value of the impedance is 1 ohm when the emotion of the subject fluctuates, then the skin resistance is changed from 1 ohm to 2 ohm when the channel is collected. The skin resistance of signals acquired by a plurality of channels after data addition is increased to 2 of the skin resistance of a single channelnAnd n is the number of channels, the resistance of the skin resistance of the 4-channel acquisition is increased to 16 ohms according to the embodiment of the invention.
The skin resistance measuring device based on multiple channels provided by the invention has the advantages that an operation circuit is constructed for each channel in the multiple channels formed by the electrode group, the data of each channel is collected, the data of the multiple channels are overlapped, the impedance change of measured skin electrons is maximized, and the accuracy of data sampling is improved to the maximum extent.
According to the skin resistance measuring device based on multiple channels, an operation circuit is constructed for each channel in multiple channels formed by the electrode group, negative feedback is introduced into the operation circuit, the sensitivity of the detection circuit is improved, and the precision and the sensitivity of the skin resistance measuring circuit are greatly improved.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
Claims (9)
1. A multi-channel based skin resistance measurement device, the device comprising:
the device comprises a plurality of electrode groups, a plurality of sensors and a plurality of sensors, wherein each electrode group comprises a plurality of electrodes and is used for forming a plurality of skin resistance measuring channels so as to acquire signals of skin resistance changes of different parts of a human body;
a path selector connected to the plurality of electrode groups, for selecting one of the plurality of electrode groups to be selected and turned on;
the proportional operation circuit is used for receiving a skin resistance change signal measured by one electrode group selected by the path selector and amplifying the received signal; the proportional operation circuit comprises a first branch circuit and a second branch circuit, wherein the first branch circuit is connected with the skin resistance measurement channels in series, the second branch circuit is connected with the first branch circuit in parallel, the first branch circuit comprises a first input impedance, the second branch circuit comprises two second input impedances, and the voltage value between the two second input impedances is half of the driving voltage between the resistance measurement channels.
2. The device of claim 1, wherein the set of electrodes comprises n electrodes, the n electrodes forming n-1 channels.
3. The apparatus of claim 2, further comprising:
and a control unit connected with the path selector and used for controlling the path selector based on the measurement signal of the proportional operation circuit.
4. The apparatus of claim 3, further comprising an a/D converter interposed between the proportional operating circuit and the control unit for converting the analog signal output from the proportional operating circuit into a digital signal and indicating it to the control unit.
5. The device of claim 1, wherein the number of electrodes in the plurality of electrode sets is the same or different.
6. The device of claim 1, wherein the plurality of electrode sets have different shapes and contact patterns with human skin.
7. The apparatus of claim 1, further comprising a signal processor for performing data superposition on the signals acquired by each channel.
8. The apparatus of claim 6, wherein the signals collected by the n channels are processedThe skin resistance after data superposition is improved to 2 of the skin resistance acquired by a single channelnAnd (4) doubling.
9. The apparatus of claim 1, further comprising a constant voltage power supply for voltage driving the plurality of channels.
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| PCT/CN2021/072878 WO2021147902A1 (en) | 2020-01-20 | 2021-01-20 | Multi-channel based skin resistance measuring device and method |
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