KR102496569B1 - A method and a device for determining impedance characteristics - Google Patents

Abstract

According to an embodiment, a method for determining impedance characteristics includes determining a test signal in a frequency domain representing an energy level for a frequency range of interest; acquiring an impulse signal representing the test signal in the time domain; applying the impulse signal to a first electrode attached to an electrolyte; obtaining a response magnitude for the frequency range of interest based on a response signal obtained from a second electrode attached to the electrolyte; And determining the impedance characteristics between the first electrode and the electrolyte based on the magnitude of the response; including, a method is provided.

Description

Method and device for determining impedance characteristics {A METHOD AND A DEVICE FOR DETERMINING IMPEDANCE CHARACTERISTICS}

The present disclosure relates to a method and device for determining impedance characteristics, and more particularly, by determining a test signal in a frequency domain representing an energy level for a frequency range of interest and using an impulse signal representing the test signal in a time domain. A method and device capable of improving efficiency in terms of cost and time by determining impedance characteristics for a frequency region of interest.

According to the prior art, there is a method of comparing signal-to-noise ratios of biological signals as a method of obtaining electrical characteristics of an electrode. However, this prior art has a limitation in that the performance of the electrode may not be accurately reflected according to the characteristics of the human body of the measurer, so that a large difference occurs depending on the individual measurer. In addition, there are also differences in the method of defining the signal-to-noise ratio. A large difference occurred.

Among the conventional technologies, EIS (Electrochemical Impedance Spectroscopy) technology is the most representative method for quantitatively extracting the electrical characteristics of the electrode surface. Since it usually uses a 3-electrode system, the working electrode to be measured for the extraction of characteristics of the electrode In addition, a separate reference and counter electrode are essentially required, and there is a limitation that measurement is possible only in a static situation in which all three electrodes are immersed in electrolyte.

In addition, EIS technology has the advantage of high accuracy because it generates individual signals for each frequency to be measured and then goes through the process of analyzing each signal, but has the disadvantage that it takes a long time for measurement and analysis, and accordingly the equipment price increases. It is inevitable to be implemented at a high price, such as tens of thousands of won, and has a disadvantage of low efficiency in terms of cost.

Accordingly, there is a growing demand for an analysis technology capable of solving the above problems and improving efficiency in terms of cost and time.

An embodiment of the present disclosure is to solve the above-described problems of the prior art, by determining a test signal in the frequency domain representing the energy level for a frequency range of interest, and using an impulse signal representing the test signal in the time domain. It is possible to provide a method and device capable of improving efficiency in terms of cost and time by determining impedance characteristics for a frequency region of interest.

The purpose of the present disclosure is not limited to the purpose mentioned above, and other objects not mentioned will be clearly understood from the description below.

An impedance characteristic determination method according to a first aspect of the present disclosure includes determining a test signal in a frequency domain representing an energy level for a frequency range of interest; acquiring an impulse signal representing the test signal in the time domain; applying the impulse signal to a first electrode attached to an electrolyte; obtaining a response magnitude for the frequency range of interest based on a response signal obtained from a second electrode attached to the electrolyte; and determining an impedance characteristic between the first electrode and the electrolyte based on the magnitude of the response.

Also, the determining of the impedance characteristics may include determining a magnitude of impedance according to a frequency.

Also, the determining of the impedance characteristics may include determining a magnitude of capacitance or reactance according to the frequency.

The determining of the impedance characteristics may include obtaining a comparison result between a first function determined through analysis of the magnitude of the response and a preset second function; and determining magnitudes of capacitance, reactance, and resistance according to the frequency based on the comparison result.

The method may further include determining a noise quantification index representing a degree of occurrence of motion-induced noise based on a response level for a preset low frequency range among the frequency range of interest.

In addition, the obtaining of the response size for the frequency range of interest may include a first response signal obtained from the second electrode when the electrolyte is in a static state and a response signal obtained from the second electrode when the electrolyte is in a dynamic state. Based on each second response signal, obtaining a first response magnitude and a second response magnitude for the frequency range of interest, respectively, wherein the determining of the quantification index determines the first response magnitude in the low frequency range. The method may include determining the noise quantification index based on a comparison result between the magnitude and the second response magnitude.

The method may further include outputting a message warning of generation of noise due to the motion when the noise quantification index is greater than or equal to a preset value.

Also, the frequency range of interest may be between a preset number of hertz (Hz) and several hundred kilohertz (kHz) or several megahertz (MHz).

In addition, the impulse signal may be applied to the first electrode by a signal generator, and the response signal may be obtained from the second electrode by an oscilloscope.

A device for determining impedance characteristics according to a second aspect of the present disclosure includes a transmitter for outputting an impulse signal representing a test signal in the time domain to a first electrode attached to an electrolyte; a receiver for obtaining a response level for a frequency range of interest based on a response signal obtained from a second electrode attached to the electrolyte; and a processor determining the test signal in a frequency domain representing an energy level for the frequency range of interest and determining an impedance characteristic between the first electrode and the electrolyte based on the response level.

A third aspect of the present disclosure may provide a computer readable recording medium recording a program for executing the method according to the first aspect in a computer. Alternatively, the fourth aspect of the present disclosure may provide a computer program stored in a recording medium to implement the method according to the first aspect.

According to an embodiment of the present disclosure, it is possible to accurately and quickly determine impedance characteristics of a frequency region of interest.

In addition, since an impulse signal can be applied through a signal generator and a response signal can be measured through an oscilloscope, efficiency can be significantly improved in terms of cost and time.

In addition, in the case of measuring the human body, as the measurement is quickly completed, the influence of inhomogeneous characteristics of the human body changing over time can be minimized.

In addition, impedance characteristics can be accurately measured even in a moving state, and the degree of noise caused by the movement can be quantified.

The effects of the present disclosure are not limited to the above effects, and should be understood to include all effects that can be inferred from the configuration of the invention described in the detailed description or claims of the present disclosure.

1 is a conceptual diagram illustrating an operation of a device 100 according to an exemplary embodiment.
2 is a block diagram illustrating an example of a configuration of a device 100 according to an exemplary embodiment.
3 is a flowchart illustrating a method for the device 100 to determine impedance characteristics according to an exemplary embodiment.
4 is a diagram for explaining an operation of determining a test signal in the frequency domain by the device 100 according to an embodiment.
5 is a diagram for explaining an operation of acquiring an impulse signal in the time domain by the device 100 according to an embodiment.
6 is a diagram for explaining an operation of obtaining a response size for a frequency range of interest based on a response signal by the device 100 according to an embodiment.
7 is a diagram illustrating an example in which the device 100 operates according to an exemplary embodiment.
8 is a graph comparing a result of characterization of the surface of an electrode according to the prior art and a result of characterization of the electrode surface of the device 100 according to an embodiment.
FIG. 9 is a diagram for explaining an operation of analyzing a degree of noise caused by motion by the device 100 according to an exemplary embodiment.

The terms used in the embodiments have been selected as general terms that are currently widely used as much as possible while considering the functions in the present disclosure, but they may vary depending on the intention or precedent of a person skilled in the art, the emergence of new technologies, and the like. In addition, in a specific case, there is also a term arbitrarily selected by the applicant, and in this case, the meaning will be described in detail in the description of the invention. Therefore, terms used in the present disclosure should be defined based on the meaning of the term and the general content of the present disclosure, not simply the name of the term.

In the entire specification, when a part is said to "include" a certain component, it means that it may further include other components, not excluding other components unless otherwise stated. In addition, as described in the specification, "... wealth", "… A term such as “module” refers to a unit that processes at least one function or operation, and may be implemented as hardware or software or a combination of hardware and software.

Hereinafter, with reference to the accompanying drawings, embodiments of the present disclosure will be described in detail so that those skilled in the art can easily carry out the present disclosure. However, the present disclosure may be implemented in many different forms and is not limited to the embodiments described herein.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings.

1 is a conceptual diagram illustrating an operation of a device 100 according to an exemplary embodiment.

Referring to FIG. 1 , the device 100 may be electrically connected to a first electrode 10 and a second electrode 20 attached to an electrolyte 200, and the first electrode 10 And it is possible to determine the impedance characteristics of the measurement target based on the signal transmitted to and received from the electrolyte 200 through the second electrode 20 .

Here, the measurement target represents an interface between an electrode attached to the electrolyte 200 and the electrolyte 200, and in one embodiment, the impedance characteristics between the first electrode 10 and the electrolyte 200, for example, the first The impedance characteristics of one side or part of the electrolyte 200 positioned between the electrode 10 and the second electrode 20 may be shown.

In one embodiment, the electrolyte 200 may be an electrolyte included in a battery module, and may be, for example, a liquid electrolyte containing an organic solvent and a lithium salt, or a solid polymer electrolyte containing a polymer and a lithium salt. It is not limited to any one, and may be carried out through various other known electrolytes. In this case, for example, the first electrode 10 and the second electrode 20 may correspond to two electrodes (eg, an anode and a cathode) included in the battery module and dipped in the electrolyte 200, or the electrolyte ( 200) may be implemented as a separate electrode directly or indirectly connected. Impedance characteristics determined through these can be used to analyze the interface reaction occurring between the electrode and the electrolyte of the battery.

In another embodiment, the electrolyte 200 may be an electrolyte included in the human body, for example, it may mean a part of the body including sodium chloride (NaCl) locally. In this case, for example, the first electrode 10 and the second electrode 20 are positioned adjacently within a predetermined distance on the skin surface near a body part (eg, heart, eyeball, muscle, etc.) to be measured or analyzed. It can be attached and implemented as an electrode for skin (eg Ag/AgCl). Impedance characteristics determined through these can be used to measure or analyze the characteristics of various human body signals, such as an ECG (electrocardiogram) signal representing an electrocardiogram, an EOG (electrooculogram) signal representing an ocular electrogram, and an EMG (electromyography) signal representing an electromyogram. .

2 is a block diagram illustrating an example of a configuration of a device 100 according to an exemplary embodiment, and FIG. 3 is a flowchart illustrating a method for determining impedance characteristics by the device 100 according to an exemplary embodiment.

Referring to FIGS. 2 and 3 , the device 100 may include a process 110 , a transmitter 120 and a receiver 130 .

At step S310, process 110 may determine a test signal in the frequency domain. Here, the test signal represents an energy level for a frequency range of interest. Also, the frequency range of interest represents a frequency range for which impedance characteristics are to be determined, and may be set by a user. In one embodiment, the frequency range of interest may be between a preset number of hertz (Hz) and several hundred kilohertz (kHz) or several megahertz (MHz), but is not limited thereto. For example, when the measurement target is the skin, It can be set to a frequency range of up to about 90 kHz, and if the measurement target is a lithium ion battery, it can be set to a frequency range of 4 Hz to 5 MHz, and in some cases, it can be set to a value between several megahertz and several tens of megahertz. A range of values may be used.

In one embodiment, process 110 may obtain a frequency range of interest and an energy level, respectively, based on a user input, and determine a test signal representing an energy level for the frequency range of interest in the frequency domain. In another embodiment, process 110 obtains information about a function used to determine a test signal based on a user input, and calculates a distribution of energy per unit frequency through a Fourier transform of the obtained function. It is possible to determine the test signal in the frequency domain by determining

Process 110 according to one embodiment may determine a test signal in the frequency domain as shown in FIG. 4 . For example, FIG. 4(a) shows a test signal in the case where the frequency range of interest is greater than or equal to 0 and less than or equal to f ₀ and the size of power spectral density (PSD) corresponding to the size of energy is E ₀ , and the X-axis and energy for frequency (F) It is a diagram conceptually shown on the Y-axis for (PSD), and FIG. 4 (b) shows the test signal in the case where the frequency range of interest is 0 or more and f ₁ or less and the size of the PSD is E ₁ as X for frequency (F). It is a conceptual diagram on the Y axis for Axis and Energy (PSD).

In step S320, process 110 may obtain an impulse signal representing the test signal in the time domain. In an embodiment, the waveform of the impulse signal having a frequency component within the frequency range of interest and the magnitude of the output voltage may be determined from the frequency range of interest and the magnitude of energy appearing in the test signal.

In one embodiment, process 110 may determine an impulse signal that outputs a voltage of infinite magnitude in the time domain, as shown in FIG. 5(a). For example, FIG. 5(a) shows an impulse having all frequency components determined from a test signal whose frequency range of interest is infinite (eg, when f ₀ is infinite in FIG. 4(a)) and whose PSD size is E ₀ . It is a diagram conceptually showing the signal on the X-axis for time (T) and the Y-axis for the magnitude (V) of the output voltage, and based on Equation 1, the unit impulse function δ (0) = ∞ (t ₀ = 0), the waveform of the impulse signal and the size of the output voltage may be determined.

[Equation 1]

In one embodiment, process 110 may determine an impulse signal that outputs a voltage of finite magnitude in the time domain, as shown in FIG. 5(b). For example, FIG. 5(b) shows an impulse signal having a finite frequency component of 0 or more f ₁ or less determined from a test signal having a frequency range of interest of 0 or more f ₁ or less and a PSD size E ₁ at a time (T) It is a diagram conceptually shown on the X-axis for and the Y-axis for the magnitude (V) of the output voltage. That is, the process 110 determines the voltage magnitude (V ₁ ) and time width of the impulse signal using the frequency range of interest from 0 to less than f ₁ and the energy magnitude of E ₁ , for example, the maximum value of the frequency of interest (f ₁ ), determine the time width (“t ₁ ~ (t ₁ + t ₀ )” or “-t ₀ /2 ~ t ₀ /2”) of the impulse signal, and It is possible to determine the waveform of the impulse signal having

As such, the impulse signal according to an embodiment is not a general impulse signal that theoretically has all frequency components and outputs an infinitely large voltage, but has only frequency components within the frequency range of interest to be measured and has a finite size (e.g., It represents an impulse signal outputting a voltage of V ₁ ). Even if you want to generate an impulse signal with an infinite size theoretically, there is a limit to the impulse that can be practically created, and the frequency range of interest that designers want to measure is in most cases from hundreds of kilohertz to several megahertz, so the part to be measured By generating an impulse signal having a positive frequency component and using it for signal analysis, efficiency can be remarkably improved in terms of cost and required time.

In step S330, the transmitter 120 may apply an impulse signal to the first electrode 10 attached to the electrolyte 200. For example, a capacitance component may be formed at an interface between the first electrode 10, the electrolyte 200, and the second electrode 20, and the transmission unit 120 is electrically connected to the first electrode 10 and receives a user input. According to this, the impulse signal shown in FIG. 5 (b) can be output as an AC signal to the first electrode 10, and the impulse signal output to the first electrode 10 in this way can be output to the first electrode 10, electrolyte ( 200) and the second electrode 20, the output size and waveform change.

In one embodiment, the transmitter 120 includes a signal generator capable of generating a signal having a preset waveform, and may be implemented through, for example, a function generator.

In step S340, the receiver 130 may obtain a response level for the frequency range of interest based on the response signal obtained from the second electrode 20 attached to the electrolyte 200. For example, the receiving unit 130 may be electrically connected to the second electrode 20, and the second electrode 20 may be electrically connected within a preset time interval (eg, 5 seconds) after the impulse signal is output to the first electrode 10. ), and converting the measured response signal in the time domain into the frequency domain to determine the response size for the frequency range of interest. For example, compared to the test signal, the magnitude of the response may change in amplitude and phase while passing through capacitance components formed between the first electrode 10, the electrolyte 200, and the second electrode 20. .

In one embodiment, the receiving unit 130 passes through the capacitance components as shown in FIG. 6(a) and measures a changed response signal, and as shown in FIG. A Fourier transform and signal analysis can be performed to determine the amplitude (M) and phase (P) for the frequency range of interest.

In one embodiment, the receiver 130 includes a signal measurer that measures a change of an input signal over time, and may be implemented through, for example, an oscilloscope.

In step S350 , the process 110 may determine impedance characteristics between the first electrode 10 and the electrolyte 200 based on the magnitude of the response. In one embodiment, process 110 determines a magnitude of impedance over frequency according to amplitude (M) and phase (P) for a frequency range of interest determined from the magnitude of the response, e.g., magnitude of capacitance or reactance over frequency. can decide

In one embodiment, the process 110 determines the first function through analysis of the magnitude of the response, obtains a comparison result of the first function and a preset second function, and calculates a capacitance according to frequency based on the comparison result. , the magnitude of the reactance and resistance can be determined. For example, a first function is derived as a system function through analysis of a response signal to an impulse signal, and the contact resistance of the first electrode 10 to the second electrode 0 is determined by comparing the system function with a previously stored theoretical system function. and contact capacitance can be extracted.

Accordingly, the process 110 can quickly and simply quantitatively extract the characteristics of the electrode surface without a separate reference and counter electrode, and can be used not only in a system such as electrode-electrolyte-electrode included in a battery but also in the skin Impedance characteristics can be easily measured by attaching electrodes for skin on the top.

In addition, after sending an impulse signal to one electrode for the first electrode 10, the electrolyte 200, and the second electrode 20 through the transmitter 120, the receiver 130 transmits the impulse signal from the opposite electrode. The electrical characteristics of the electrode can be extracted efficiently in terms of cost and time by measuring the response signal.

FIG. 7 is a diagram showing an example in which the device 100 according to an embodiment operates, and FIG. 8 shows a characteristic analysis result of an electrode surface according to the prior art and characteristics of the electrode surface of the device 100 according to an embodiment. This is a graph comparing analysis results.

Referring to FIG. 7 , the transmitter 120 may be implemented as a function generator, the receiver 130 may be implemented as an oscilloscope, and the processor 110 may be implemented as a computer or the like. For example, after sending an impulse signal to one electrode of an electrode-electrolyte-electrode system by connecting the output terminal of the function generator and the first electrode 10, connecting the input terminal of the oscilloscope and the second electrode 20 to A response signal to the impulse signal may be measured at the opposite electrode of the electrolyte-electrode system, and the processor 110 analyzes the measured response signal and the characteristics of the response magnitude for the frequency region of interest derived therefrom to determine the response signal for the electrode surface. Impedance characteristics can be extracted.

Referring to FIG. 8 , it can be seen that the analysis result of the device 100 according to an embodiment shows an error rate of 10.7% compared to the conventionally commonly used electrochemical impedance spectroscopy (EIS) method.

Specifically, FIG. 8(a) shows the amplitude and phase according to the frequency analyzed according to the prior art when the first electrode 10 and the second electrode 20 are Ag/AgCl used as representative skin electrodes. The 1-1st graph 811 and the 1-2nd graph 812 respectively indicate the size of (Phase), and the 2-1st graph 811 and 2-1st graph 812 respectively indicate the size of the amplitude and phase according to the frequency analyzed by the device 100. A graph 821 and a 2-2 graph 822 are shown.

In addition, FIG. 8(b) shows the magnitudes of the amplitude and phase according to the frequency analyzed according to the prior art when the first electrode 10 and the second electrode 20 are made of stainless steel, which is corrosion-resistant steel. 1-3 graphs 813 and 1-4 graphs 814 and 2-3 graphs 823 and 2 respectively show amplitude and phase amplitude according to the frequency analyzed by the device 100. A -4 graph 824 is shown.

As shown in FIGS. 8(a) to 8(b), the EIS technology most commonly used to analyze the surface characteristics of an existing electrode and the device 100 according to an embodiment show a very low error rate and are similar to each other. It can be seen that the analysis results are derived.

In general, the EIS technology has the advantage of relatively high measurement accuracy, but has a disadvantage in that considerable cost is required to implement the equipment and the measurement time is also longer than about 10 minutes.

However, according to an embodiment of the present invention, the device 100 can implement the electrical characteristic analysis result of the electrode with an accuracy level similar to that of the EIS technology using a signal generator and oscilloscope equipment that are remarkably cost-effective, and about 5 It has an effect that can be measured quickly within seconds.

In addition, in the case of measuring the human body, as described above, as the measurement is quickly completed, there is an effect of minimizing the influence of inhomogeneous characteristics of the human body that change over time.

FIG. 9 is a diagram for explaining an operation of analyzing a degree of noise caused by motion by the device 100 according to an exemplary embodiment.

Referring to FIG. 9 , a process 110 may determine a noise quantification index indicating a degree of noise caused by motion based on a response level for a predetermined low frequency range among frequency ranges of interest. For example, when a response signal to the impulse signal is obtained, the degree of noise caused by motion may be quantified by analyzing the response signal in a low frequency range below a predetermined frequency (eg, 10 Hz).

9(a) shows the first response signal 911 obtained from the second electrode 20 when the electrolyte 200 is in a static state and the second electrode 20 when the electrolyte 200 is in a dynamic state. An example of each of the obtained second response signals 921 is shown, and FIG. 9(b) shows the size of the PSD for the frequency region of interest analyzed from each of the first response signal 911 and the second response signal 921. An example of each of the first response size 912 and the second response size 922 is shown.

Specifically, the process 110 generates a first response signal from the second electrode 20 by applying an impulse signal to the first electrode 10 when the electrolyte 200 is in a static state, as shown in FIG. 9(a). 911 may be obtained, and the second response signal 921 may be obtained from the second electrode 20 by applying an impulse signal to the first electrode 10 when the electrolyte 200 is in a dynamic state. In addition, the process 110 determines the first response magnitude 912 and the second response signal 912 for the frequency range of interest based on the first response signal 911 and the second response signal 921, respectively, as shown in FIG. 9(b). Each of the two response magnitudes 922 may be obtained. For example, according to the above-described embodiment, each of the first response magnitude 912 and the second response magnitude 922 is analyzed in the frequency range of interest (eg, 0 to 100 Hz). The first response size 912 and the second response size 922 may be calculated by calculating the PSD size according to the frequency.

The process 110 determines the first impedance between the first electrode 10 and the electrolyte 200 when the electrolyte 200 is in a static state based on the first response magnitude 912 and the second response magnitude 922, respectively. Characteristics and second impedance characteristics between the first electrode 10 and the electrolyte 200 are determined respectively when the electrolyte 200 is in a dynamic state, and the first response magnitude 912 and the second response magnitude 922 Information including a comparison result between the first and second impedance characteristics and a comparison result between the first impedance characteristic and the second impedance characteristic may be output.

Process 110 may determine a noise quantification factor based on a comparison between the first response magnitude 912 and the second response magnitude 922 in the low frequency range. For example, a frequency range of 10 Hz or less, in which motion-induced noise is mainly formed, is determined as a low frequency range, and a signal strength ratio between the first response magnitude 912 and the second response magnitude 922 or the first response magnitude 922 at 10 Hz or less A noise quantification index may be calculated by calculating a signal intensity ratio between the signal 911 and the second response signal 921 .

In general, noise caused by movement is a very fatal factor that interferes with the measurement of bioelectrical signals in wearable sensors, whereas in the prior art, since the measurement object is put in the equipment and measured, the moving object cannot be measured according to the prior art. Depending on the performance of the electrode, there was also a limitation that the noise caused by motion could not be quantitatively analyzed.

However, according to an embodiment of the present invention, the device 100 can measure impedance between an electrode attached to the skin and the skin in a moving environment by connecting an electrode contacting the measurement target, a function generator, and an oscilloscope with a wire. There is an effect of quantifying noise caused by motion by analyzing the response signal to the impulse signal and calculating the signal intensity ratio of about 10 Hz or less, where noise due to motion is mainly formed.

In one embodiment, the process 110 may output a warning message about generation of noise due to motion when the noise quantification index is equal to or greater than a preset value. For example, when the noise quantification index calculated by comparing response signals measured in each of the static state and the dynamic state with respect to the impulse signal exceeds a set value, a warning message or warning sound notifying excessive noise according to the dynamic state is generated. can be printed out. For another example, for the electrolyte 200 whose static or dynamic state is not determined, the response signal to the impulse signal is analyzed in a low frequency range (eg, 0 to 10 Hz), and the size of the PSD (eg, average value) in the low frequency range , maximum value, etc.) and the preset value (eg, 3 V ² /Hz) to calculate the noise quantification index according to the comparison result (eg ratio), and if the noise quantification index is greater than or equal to the preset value, it is measured in a dynamic state A warning message notifying that a significant amount of noise has occurred due to motion and a recommendation message recommending re-measurement in a static state may be output.

In one embodiment, the processor 110 may determine the preset value based on the type of electrolyte and the type of electrode. For example, the preset value may be determined by reflecting the first weight assigned to the type of electrolyte and the second weight assigned to the type of electrode to the preset default value, and accordingly, whether to output a message may be determined by comparing a noise quantification index. For example, a different first weight is given according to the type of electrolyte corresponding to the electrolyte 200, and a different second weight is given according to the type of electrode corresponding to the first electrode 10 to the second electrode 20, , When the type of electrolyte and the type of electrode are determined according to the user input, the preset values may be updated in proportion to the first weight and the second weight by bringing the first weight and the second weight previously stored in correspondence with each other. For example, the case where the electrolyte 200 is human skin may be given a higher weight than the case where the electrolyte 200 is a battery electrolyte, and the case where the first electrode 10 to the second electrode 20 is a skin electrode is a battery electrode. A higher weight may be assigned than the case of , and the first weight may be greater than the second weight.

In one embodiment, the processor 110 may perform a series of operations for determining impedance characteristics, may be implemented by including a central processor unit (CPU) that controls overall operations of the device 100, and may include a transmitter. 120, the receiver 130 and other components may be electrically connected to control data flow between them.

In one embodiment, each of the processor 110, the transmitter 120, and the receiver 130 may be implemented as an independent device. For example, as described above, the transmitter 120 and the receiver 130 are a function generator and an oscilloscope, respectively. , and the processor 110 may be implemented as a computing device such as a desktop PC, tablet PC, or laptop PC. In another embodiment, the components of the device 100 may be implemented as a single integrated device.

In addition, those of ordinary skill in the art may understand that other general-purpose components may be further included in the device 100 in addition to the components shown in FIG. 1 . For example, the device 100 may further include a communication module for transmitting and receiving information including impedance characteristics to other devices, a cable for assisting electrical connection to the first electrode 10 or the second electrode, and the like. .

On the other hand, the above-described method can be written as a program that can be executed on a computer, and can be implemented in a general-purpose digital computer that operates the program using a computer-readable recording medium. In addition, the structure of data used in the above-described method can be recorded on a computer-readable recording medium through various means. The computer-readable recording medium includes storage media such as magnetic storage media (eg, ROM, RAM, USB, floppy disk, hard disk, etc.) and optical reading media (eg, CD-ROM, DVD, etc.) do.

The description of the present disclosure described above is for illustrative purposes, and those skilled in the art can understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present disclosure. will be. Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present disclosure is indicated by the following claims, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts thereof should be construed as being included in the scope of the present disclosure.

100: device
110: processor 120: transmitter
130: receiver
10: first electrode 20: second electrode
200: electrolyte

Claims (10)

In the impedance characteristic determination method,
determining a test signal in the frequency domain representing an energy level for a frequency range of interest;
acquiring an impulse signal representing the test signal in the time domain;
applying the impulse signal to a first electrode attached to an electrolyte;
obtaining a response magnitude for the frequency range of interest based on a response signal obtained from a second electrode attached to the electrolyte; and
Determining an impedance characteristic between the first electrode and the electrolyte based on the response magnitude; Including,
the impulse signal is applied to the first electrode by a signal generator;
the response signal is obtained from the second electrode by an oscilloscope;
The response signal is obtained from the second electrode within a predetermined time after the impulse signal is applied to the electrolyte through the first electrode,
Wherein the first electrode and the second electrode are determined to be one of a skin electrode or a battery electrode.
According to claim 1,
The step of determining the impedance characteristics is
A method comprising determining an impedance magnitude as a function of frequency.
According to claim 2,
The step of determining the impedance characteristics is
and determining a magnitude of capacitance or reactance as a function of the frequency.
According to claim 3,
The step of determining the impedance characteristics is
obtaining a comparison result between a first function determined through analysis of the response size and a preset second function; and
And determining magnitudes of capacitance, reactance and resistance according to the frequency based on the comparison result.
According to claim 1,
The method further comprising determining a noise quantification index indicating a degree of noise generated by motion based on a response magnitude for a preset low frequency range among the frequency range of interest.
According to claim 5,
Obtaining a response magnitude for the frequency range of interest
Based on each of the first response signal obtained from the second electrode when the electrolyte is in a static state and the second response signal obtained from the second electrode when the electrolyte is in a dynamic state, Obtaining each of the first response size and the second response size; includes,
The step of determining the quantification index is
Determining the noise quantification index based on a comparison result between the first response magnitude and the second response magnitude in the low frequency range;
The noise quantification index is determined based on the type of electrolyte and the type of electrode,
Based on the pre-stored first weight and second weight, a first weight updated according to a proportional relationship is assigned to the electrolyte type, and an updated second weight is assigned to the electrode type,
When the electrolyte type corresponds to a person, a higher weight is given than when it corresponds to a battery,
wherein the magnitude of the first weight is greater than the magnitude of the second weight.
According to claim 5,
When the noise quantification index is greater than or equal to a preset value, outputting a message warning of the occurrence of noise due to the motion;
The noise quantification index is determined based on the signal intensity ratio of the preset value and the average value or maximum value of power spectral density (PSD) in the range of 10 HZ or less,
Outputting the warning message
The method further comprising outputting a remeasurement request message in a static state.
According to claim 1,
The frequency range of interest is
between a predetermined number of hertz (Hz) and hundreds of kilohertz (kHz) or several megahertz (MHz).
delete In the device for determining the impedance characteristics,
a transmitter for outputting an impulse signal representing the test signal in the time domain to a first electrode attached to the electrolyte;
a receiver for obtaining a response level for a frequency range of interest based on a response signal obtained from a second electrode attached to the electrolyte; and
A processor for determining the test signal in a frequency domain representing an energy level for the frequency range of interest and determining an impedance characteristic between the first electrode and the electrolyte based on the response level;
the impulse signal is applied to the first electrode by a signal generator;
the response signal is obtained from the second electrode by an oscilloscope;
The response signal is obtained from the second electrode within a predetermined time after the impulse signal is applied to the electrolyte through the first electrode,
Wherein the first electrode and the second electrode is determined as one of a skin electrode or a battery electrode.

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