Free chlorine concentration measurement system, free chlorine concentration measurement program, and free chlorine concentration measurement method

Abstract

To provide a free chlorine density measuring system for measuring correctly, free chlorine density without adjusting or identifying a pH thereof in advance, and a free chlorine density measuring program and a free chlorine density measuring method.SOLUTION: There is provided a free chlorine density measuring system in which free chlorine density of a measurement target is measured on the basis of a change of a current value being obtained by, applying a voltage to an electrode part, the free chlorine density measuring system comprises: a measuring part for measuring a change of a current value of the measurement target obtained by applying the voltage to the electrode part; an estimation part for using a plurality of current values which is measured by the measuring part, and a learned model obtained by learning a relationship among a change of the current value, free chlorine density and a pH of the free chlorine estimating at least the free chlorine density of the measurement target; and a display part for displaying information related to the free chlorine density estimated by the estimation part.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a free chlorine concentration measurement system, a free chlorine concentration measurement program, and a free chlorine concentration measurement method.

Background Art

[0002] Conventionally, as a method for measuring the free chlorine concentration, a method of measuring a current value by an electrochemical measurement method and estimating the free chlorine concentration of a liquid based on the measurement value is known (Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, as shown in FIG. 4, the current value measured by the electrochemical measurement method varies depending on the pH of the liquid. Even if the free chlorine concentration is the same, the current value varies when the pH of the liquid changes. Therefore, it is not possible to accurately measure the free chlorine concentration only by the current value, and it is necessary to adjust or specify the pH in advance before measurement, so there is a problem that measurement cannot be performed efficiently. In addition, when the pH cannot be adjusted or specified accurately, there is also a problem that the free chlorine concentration cannot be measured accurately.

[0005] The present invention has been made in view of the above problems, and an object thereof is to provide a free chlorine concentration measurement system, a free chlorine concentration measurement program, and a free chlorine concentration measurement method capable of accurately measuring the free chlorine concentration without adjusting or specifying the pH in advance.

Means for Solving the Problems

[0006] In order to achieve the above object, the present invention is a free chlorine concentration measurement system for measuring the free chlorine concentration of a measurement target based on a change in the current value obtained by applying a voltage to an electrode unit, comprising: a measurement unit for measuring a change in the current value of the measurement target obtained by applying a voltage to the electrode unit; a plurality of current values measured by the measurement unit; and an estimation unit for estimating at least the free chlorine concentration of the measurement target using a learned model that has learned the relationship between the change in the current value, the free chlorine concentration, and the pH, and a display unit for displaying information regarding the free chlorine concentration estimated by the estimation unit.

[0007] In the free chlorine concentration measurement system according to the present invention, the estimation unit is configured to estimate the pH of the measurement target using a plurality of current values measured by the measurement unit and the learned model, and the display unit is preferably configured to display the pH together with information regarding the free chlorine concentration estimated by the estimation unit.

[0008] In the free chlorine concentration measurement system according to the present invention, the display unit may be configured to display the free chlorine concentration as a numerical value.

[0009] In the free chlorine concentration measurement system according to the present invention, it is preferable to further include a learning unit that learns the relationship between the change in the current value, the free chlorine concentration, and the pH based on input data indicating the change in the current value of the learning target obtained by applying a voltage to the electrode unit and correct data indicating the free chlorine concentration and the pH corresponding to the change in the current value of the learning target, and generates a learned model.

[0010] In the free chlorine concentration measurement system according to the present invention, the input data may be numerical data indicating the change in the current value or image data of a current-potential curve indicating the change in the current value.

[0011] In the free chlorine concentration measurement system according to the present invention, the electrode unit preferably includes a working electrode and a counter electrode, and the working electrode and the counter electrode are printed electrodes obtained by printing conductive ink on a substrate made of an insulating material.

[0012] The electrode part further includes a reference electrode, and the reference electrode may be a printed electrode obtained by printing silver ink on the substrate.

[0013] The free chlorine concentration measurement system according to the present invention further includes a free chlorine concentration measurement device having at least the electrode part, and the free chlorine concentration measurement device is preferably of a handy type.

[0014] Further, the free chlorine concentration measurement program according to the present invention includes a measurement process for measuring a change in the current value of a measurement target obtained by applying a voltage to an electrode part, a plurality of measured current values, a learned model that has learned the relationship between the change in the current value, the free chlorine concentration, and pH, and an estimation process for estimating at least the free chlorine concentration of the measurement target using the learned model, and a display process for displaying information regarding the estimated free chlorine concentration, and is characterized in that the free chlorine concentration measurement device is caused to execute the processes.

[0015] Furthermore, the free chlorine concentration measurement method according to the present invention is a free chlorine concentration measurement method for measuring the free chlorine concentration of a measurement target based on a change in the current value obtained by applying a voltage to an electrode part, and includes a measurement step for measuring a change in the current value of the measurement target obtained by applying a voltage to the electrode part, a plurality of measured current values, a learned model that has learned the relationship between the change in the current value, the free chlorine concentration, and pH, and an estimation step for estimating at least the free chlorine concentration of the measurement target using the learned model, and a display step for displaying information regarding the estimated free chlorine concentration.

Advantages of the Invention

[0016] According to the present invention, it is possible to provide a free chlorine concentration measurement system, a free chlorine concentration measurement program, and a free chlorine concentration measurement method capable of accurately measuring the free chlorine concentration without adjusting or specifying the pH in advance.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0018] Hereinafter, preferred embodiments for carrying out the present invention will be described with reference to the drawings. Note that the following embodiments do not limit the invention according to each claim, and not all combinations of the features described in the embodiments are essential for the solution means of the invention. Further, in the present embodiment, the scale and dimensions of each component may be exaggerated, or some components may be omitted.

[0019] [Configuration of Free Chlorine Concentration Measurement System] The free chlorine concentration measurement system 1 according to the present embodiment is a free chlorine concentration measurement system that measures the free chlorine concentration of a measurement target based on the change in the current value obtained by applying a voltage to the electrode unit 20 described later. Further, as shown in FIG. 1, the free chlorine concentration measurement system 1 according to the present embodiment includes a free chlorine concentration measurement device 2 and a learning device 3. Note that in the free chlorine concentration measurement system 1 according to the present embodiment, the current value is measured by electrochemical measurement.

[0020] Here, the free chlorine concentration indicates the ratio of free chlorine in the liquid. Since free chlorine is chlorine with strong bactericidal power, the higher the free chlorine concentration, the greater the bactericidal power of the liquid. Also, free chlorine is the general term for chlorine gas (Cl2), hypochlorous acid (HOCl), and hypochlorite ions (ClO - ), and hypochlorous acid has the property of having higher bactericidal power and lower residual property compared to hypochlorite ions. That is, the bactericidal action of free chlorine varies depending on the abundance ratio of hypochlorous acid and hypochlorite ions present in free chlorine.

[0021] As shown in Figure 2, the abundance ratios of chlorine gas, hypochlorous acid, and hypochlorite ions present in free chlorine change according to the pH of the liquid. Specifically, the ratio of chlorine gas is high at pH 4 or lower, the ratio of hypochlorous acid is high at pH 4 - 7.5, and the ratio of hypochlorite ions is high at pH 7.5 or higher.

[0022] Also, in the free chlorine concentration measurement system 1 according to this embodiment, the liquid to be measured is, for example, a liquid having a bactericidal action used for tap water, hand disinfection, food hygiene management, etc., such as hypochlorous acid water, sodium hypochlorite, calcium hypochlorite, and liquefied chlorine.

[0023] [Configuration of Free Chlorine Concentration Measuring Device] The free chlorine concentration measuring device 2 according to this embodiment is a so-called handy-type free chlorine concentration measuring device that can be measured while being held by the measurer with one hand. Specifically, as shown in Figure 3, the free chlorine concentration measuring device 2 includes a main body 10 that can be held by the measurer, an electrode unit 20 electrically connected to the main body 10 via wiring, and a control unit 30 provided inside the main body.

[0024] [Configuration of Main Body] As shown in FIG. 3, the main body 10 is formed in a substantially rectangular parallelepiped shape having a length in the longitudinal direction, and has a shape that tapers from one end in the longitudinal direction to the other end in the longitudinal direction. Further, the portion of the main body 10 that is formed to taper is a gripping portion 11 for the measurer to grip the main body 10, and the gripping portion 11 is formed to a size that can be gripped by the measurer with one hand.

[0025] Also, on the surface of the main body 10, a plurality of operation buttons 12 for operating the main body 10 and a display 13 for displaying the free chlorine concentration or the like of the measurement target are arranged along the longitudinal direction of the main body 10. Specifically, the operation buttons 12 are arranged near the center of the main body 10, and the display 13 is arranged on the side opposite to the gripping portion 11 with the operation buttons 12 as a boundary.

[0026] [Configuration of the electrode part] As shown in FIG. 3, the electrode part 20 is electrically connected via wiring to the end of the main body 10 on the side where the display 13 is provided. Further, the electrode part 20 includes a working electrode 21, a counter electrode 22, and a reference electrode 23.

[0027] The working electrode 21 and the counter electrode 22 are printed electrodes formed by screen printing conductive ink on a substrate 24 made of an insulating material. As the insulating material constituting the substrate 24, for example, polyimide, alumina (aluminum oxide), glass, paper, PET, epoxy resin, etc. can be adopted. In this embodiment, the substrate 24 is a polyimide substrate. Also, as the conductive ink, carbon-based inks such as carbon, graphene, carbon nanotubes, and conductive diamond can be adopted. In this embodiment, the conductive ink is carbon ink. Note that an aspect of adopting an ink other than carbon-based ink as the conductive ink may also be possible. Further, the reference electrode 23 is a printed electrode formed by screen printing silver ink on the substrate 24. The reference electrode 23 formed by screen printing silver ink is electrolytically oxidized in a chloride solution after printing the silver ink and functions as a silver-silver chloride electrode. Note that the reference electrode 23 may be an aspect of screen printing silver-silver chloride ink on the substrate 24. Also, in this embodiment, the printing means has been described as screen printing, but it is not limited thereto, and for example, inkjet printing may be possible.

[0028] [Configuration of the control unit] As shown in FIG. 1, the control unit 30 includes a storage unit 31 that stores various data, a measurement unit 32 that measures the current values of the learning target, the base solution, and the measurement target, an estimation unit 33 that estimates the free chlorine concentration, etc. of the measurement target, a display unit 34 that displays information regarding the estimated free chlorine concentration, a determination unit 35 that determines the necessity of replacing the electrode unit 20, and a communication unit 36 that can communicate with the learning device 3.

[0029] Note that in this embodiment, the liquid to be learned, similar to the measurement target, is a liquid having a bactericidal action used for tap water, hand disinfection, food hygiene management, etc., such as hypochlorous acid water, sodium hypochlorite, calcium hypochlorite, and liquefied chlorine. Also, in this embodiment, the base solution is a liquid that serves as a base when generating the learning target and the measurement target. For example, it is an aqueous solution in which substances such as potassium chloride are dissolved in tap water at a determined ratio.

[0030] The control unit 30 is a CPU which is a processor, and the storage unit 31 is a memory such as a RAM, a ROM, an HDD, or an SDD. Further, the free chlorine concentration measuring device 2 according to the present embodiment expands the free chlorine concentration measurement program stored in the storage unit 31 in the RAM, and the CPU interprets and executes this to realize various functions of the measurement unit 32, the estimation unit 33, and the display unit 34.

[0031] Here, the free chlorine concentration measurement program is a program configured to cause the free chlorine concentration measuring device 2 to execute a measurement process of measuring changes in current values and corresponding potentials of a learning target, a base solution, and a measurement target obtained by applying a voltage to the electrode unit 20, a plurality of measured current values, an estimation process of estimating the free chlorine concentration and pH of the measurement target using a learned model obtained by learning the relationship between the change in the current value, the free chlorine concentration, and the pH, a display process of displaying the estimated free chlorine concentration and pH, and a determination process of determining the necessity of replacement of the electrode unit 20.

[0032] The storage unit 31 includes a program storage area for storing the free chlorine concentration measurement program and a data storage area for storing various data necessary for the execution of the program.

[0033] The data storage area stores current value data and potential data of the learning target and the base solution obtained by applying a voltage to the electrode unit 20, a learned model to be described later generated by the learning device 3, current value data and potential data of the measurement target obtained by applying a voltage to the electrode unit 20, and the free chlorine concentration and pH of the measurement target estimated by the estimation unit 33 to be described later.

[0034] The measurement unit 32 is configured to measure the changes in the current values of the object to be learned, the base solution, and the object to be measured obtained when a voltage is applied to the electrode unit 20. Specifically, the measurement unit 32 is configured to control the voltage (potential difference) applied between the working electrode 21 and the reference electrode 23 of the electrode unit 20, increase and decrease the potential at a constant sweep rate, and measure the current value flowing between the working electrode 21 and the counter electrode 22 of the electrode unit 20 in response to the increase and decrease of the potential. The current values of the object to be learned, the base solution, and the object to be measured measured by the measurement unit 32 are stored in the storage unit 31 in association with the potential at each current value.

[0035] In addition, the measurement of the object to be learned and the base solution performed by the measurement unit 32 is carried out in a state where the pH and the free chlorine concentration are specified in advance. For example, the measurement is performed in a state where the pH of the object to be learned and the base solution is adjusted to 5 to 9 in advance, and the free chlorine concentrations are 0, 10, 20, 40, 60, 80, 100, 120, 160, 180, and 200 ppm, and the potential and current of the object to be learned and the base solution at each pH and each free chlorine concentration are measured. Then, the learning unit 42 described later learns the relationship between the change in the current value, the free chlorine concentration, and the pH within the range of the specified pH and free chlorine concentration, and also learns the influence of the electrodes used for measurement and tap water on the measurement, and generates a learned model. Therefore, the ranges of pH and free chlorine concentration that can be measured by the free chlorine concentration measurement system 1 according to the present embodiment are the ranges of the specified pH and free chlorine concentration.

[0036] The estimation unit 33 is configured to estimate at least the free chlorine concentration of the object to be measured using a plurality of current values measured by the measurement unit 32 and a learned model that has learned the relationship between the change in the current value, the free chlorine concentration, and the pH, and also the influence of the electrodes used for measurement and tap water on the measurement. In addition, the estimation unit 33 is configured to estimate the pH of the object to be measured using a plurality of current values measured by the measurement unit 32 and the learned model. The free chlorine concentration and pH of the object to be measured estimated by the estimation unit 33 are stored in the storage unit 31.

[0037] Note that the estimation unit 33 may be configured to simultaneously estimate the free chlorine concentration and pH of the measurement target, may be configured to separately estimate the free chlorine concentration and pH, or may be configured to estimate only the free chlorine concentration. Further, the estimation unit 33 may be configured to estimate the pH of the measurement target using the current value data of the measurement target stored in the storage unit 31 and the learned model, and to estimate the free chlorine concentration of the measurement target based on the pH and the current value data of the measurement target stored in the storage unit 31.

[0038] Here, the learned model in the present embodiment is a neural network (not shown) having an input layer, an output layer, and a plurality of hidden layers. The estimation unit 33 is configured to input the current value data of the measurement target stored in the storage unit 31 into the input layer, and output the free chlorine concentration and pH of the measurement target from the output layer via the plurality of hidden layers. Details of the neural network structure will be described later.

[0039] The display unit 34 is configured to display information regarding the free chlorine concentration estimated by the estimation unit 33. Specifically, the display unit 34 is configured to display the free chlorine concentration of the measurement target stored in the storage unit 31 as a numerical value on the display 13 of the main body 10.

[0040] Further, the display unit 34 is configured to display the pH together with the information regarding the free chlorine concentration estimated by the estimation unit 33. Specifically, the display unit 34 is configured to display the free chlorine concentration and pH of the measurement target stored in the storage unit 31 as numerical values on the display 13 of the main body 10. Note that the display unit 34 may be configured to display only the free chlorine concentration or only the pH on the display 13 of the main body 10.

[0041] The determination unit 35 is configured to determine the necessity of replacing the electrode unit 20. Specifically, the determination unit 35 determines the necessity of replacing the electrode unit 20 based on a plurality of current value data of the base solution stored in the storage unit 31, and when replacement is necessary, it is configured to display the determination result on the display 13 via the display unit 34. Note that the determination unit 35 may be configured to display the determination result on the display 13 at the stage when the electrode unit 20 needs to be replaced, or may be configured to display the determination result (forecast determination result) on the display 13 at a stage before the electrode unit 20 needs to be replaced, or may be configured to display the determination result on the display 13 at both the stage before replacement is necessary and the stage when replacement is necessary.

[0042] The communication unit 36 is configured to enable data communication between the free chlorine concentration measuring device 2 and the learning device 3 via a communication network NW (wireless). Specifically, the communication unit 36 is configured to transmit the current value data and potential data of the learning target and the base solution to the learning device 3, and is configured to receive the learned model from the learning device 3. In the free chlorine concentration measuring device 2 according to the present embodiment, since the communication unit 36 can adopt various known communication means, detailed description thereof is omitted. Note that the communication unit 36 may be configured to enable data communication between the free chlorine concentration measuring device 2 and the learning device 3 by wire.

[0043] [Configuration of Learning Device] The learning device 3 according to the present embodiment is composed of, for example, a desktop or notebook personal computer or a tablet terminal, and includes an operation unit (not shown), a display (not shown), a storage unit 40 for storing various data inside the learning device 3, an input data generation unit 41 for generating information regarding input data, a learning unit 42 for performing learning based on teacher data, and a communication unit 43 capable of communicating with the free chlorine concentration measuring device 2. Since the operation unit and the display can adopt known technologies usually provided in a computer or the like, detailed description thereof is omitted.

[0044] Here, the teacher data is data that serves as teaching materials for causing the learning unit 42 to learn. In the present embodiment, it includes input data indicating changes in the current values of the learning target and the base solution obtained by applying a voltage to the electrode unit 20, and correct answer data indicating the free chlorine concentration and pH corresponding to the change in the current value of the learning target. Note that the input data may include data regarding the number of measurements performed at one electrode.

[0045] As shown in FIG. 4, the current value measured by the electrochemical measurement method varies depending on the pH of the liquid. Even if the free chlorine concentration is the same, the current value varies when the pH of the liquid changes. Therefore, by associating the current value, free chlorine concentration, and pH and causing the learning unit 42 to learn, it is possible to immediately measure the accurate free chlorine concentration from the current value without previously adjusting or specifying the pH.

[0046] Also, the measurement of the free chlorine concentration by the electrochemical measurement method is affected by differences in electrode individual differences such as surface area and internal resistance value, changes in surface state and dirt due to use, differences in electrode state due to scale adhesion, and differences in tap water used for preparing the liquid having a sterilizing action such as conductivity, ion concentration, and type of ions. And due to being affected in this way, a result different from the result that should be originally estimated is estimated by the estimation unit 33, so that accurate measurement cannot be performed. Therefore, by including data indicating changes in the current value of the base solution that is the base of the learning target and the measurement target in the input data and inputting it, and causing the learning unit 42 to learn as data taking into account the influence of the electrodes used for measurement and the tap water on the measurement, at the time of measuring the measurement target, considering the differences in electrode individual differences, differences in electrode state, and differences in tap water used for preparing the liquid, etc., the free chlorine concentration of the measurement target can be measured.

[0047] The storage unit 40 is a memory such as a RAM, a ROM, an HDD, or an SDD. Specifically, the storage unit 40 is configured to store the current value data and potential data of the learning target and the base solution measured by the free chlorine concentration measuring device 2, the input data generated by the input data generation unit 41, the correct answer data input by the measurer, and the learned model generated by the learning unit 42.

[0048] The input data generation unit 41 is configured to generate input data based on the current value data and potential data of the learning target and the base solution stored in the storage unit 40. The input data is numerical data indicating the change in the current value of the learning target and the base solution or image data of a current-potential curve indicating the change in the current value of the learning target and the base solution. Here, since the current value is proportional to the free chlorine concentration, when the main purpose is to measure the free chlorine concentration, highly accurate measurement can be performed by using numerical data as the input data. Also, since the current-potential curve varies depending on the pH of the liquid, when the main purpose is to measure the pH, highly accurate measurement can be performed by using image data that easily extracts the difference in the current-potential curves.

[0049] When the input data generation unit 41 generates numerical data indicating the change in the current value of the learning target and the base solution, it is configured to create the database shown in FIG. 5 based on the current value data of the learning target stored in the storage unit 40. Further, when the input data generation unit 41 generates image data of a current-potential curve indicating the change in the current value of the learning target and the base solution, it is configured to create the image data of the current-potential curve shown in FIG. 6 based on the current value data and potential data of the learning target stored in the storage unit 40. Note that the numerical data and image data generated by the input data generation unit 41 are stored in the storage unit 40. Also, in the present embodiment, the input data generation unit 41 has been described as creating the database shown in FIG. 5 or the image data of the current-potential curve shown in FIG. 6 based on all the data measured by the measurement unit 32 and storing these as input data in the storage unit 40. However, the present invention is not limited to this, and numerical data or image data may be generated based on data for each pH and free chlorine concentration (for example, measurement data when pH is 5 and ppm is 0), and these may be stored in the storage unit 40 as input data.

[0050] The learning unit 42 is configured to learn the relationship between the change in the current value, the free chlorine concentration, and the pH based on the input data as the teacher data stored in the storage unit 40 and the correct answer data, and also to learn the influence of the electrodes used for measurement and the tap water on the measurement, and generate a learned model.

[0051] The learning unit 42 is composed of a neural network (not shown) having an input layer, an output layer, and a plurality of hidden layers. When the input data input to the input layer is image data of a current-potential curve indicating the change in the current value of the learning target and the base solution, the neural network structure includes an input layer, a plurality of convolutional layers and a plurality of affine layers as hidden layers, and an output layer. When the input data input to the input layer is numerical data indicating the change in the current value of the learning target and the base solution, the neural network structure includes an input layer, a plurality of affine layers as hidden layers, and an output layer.

[0052] In the input layer, image data of a current-potential curve (e.g., 318×318 pixels) or numerical data indicating changes in current values (e.g., 1814 numerical values) is input. The Convolution layer is a layer that performs convolution processing according to parameters such as the kernel size, number of filters, and stride value of the set filter. The Affine layer is a layer that combines the image data from which feature parts have been extracted by the processing performed in the Convolution layer, or the numerical data input to the input layer. The output layer is a layer that outputs a result based on the output from the Affine layer, and is configured to output an estimation result in consideration of data indicating changes in the current value of the base solution (considering the influence of the electrodes used in the measurement and tap water on the measurement). Also, an activation function (ReLu) is applied to the processing performed in the Convolution layer and the Affine layer. That is, the values output by the Convolution layer and the Affine layer are transmitted to the next layer through the activation function (ReLu).

[0053] Note that the processing performed in the Affine layer is performed according to Equation 1 below.

Equation

[0054] Also, the learning unit 42 adjusts the parameter of the weight w so that the loss L between the output value obtained from the output layer and the correct data is minimized. Then, the model (neural network structure) for which the adjustment has been completed is stored in the storage unit 40 as a learned model. Note that the loss L is calculated according to a loss function (Huber loss) such as the following, for example.

Equation

[0055] The communication unit 43 is configured to enable data communication between the learning device 3 and the free chlorine concentration measuring device 2 via a communication network NW (wireless). Specifically, the communication unit 43 is configured to transmit the learned model to the free chlorine concentration measuring device 2, and to receive the current value data and potential data of the learning target and the base solution from the free chlorine concentration measuring device 2. In the learning device 3 according to the present embodiment, since the communication unit 43 can adopt various known communication means, a detailed description thereof is omitted. Note that the communication unit 43 may be configured to enable data communication between the learning device 3 and the free chlorine concentration measuring device 2 by wire.

[0056] [Method for Measuring Free Chlorine Concentration] Next, a method for measuring the free chlorine concentration using the free chlorine concentration measuring system 1 according to the present embodiment will be described with reference to FIGS. 7 and 8.

[0057] [Learning Method] First, as shown in FIG. 7, the measurer measures the base solution and the object to be learned using the free chlorine concentration measuring device 2. Specifically, in a state where the electrode unit 20 is placed in a container containing the base solution, the measurer increases or decreases the voltage (potential difference) applied between the working electrode 21 and the reference electrode 23 of the electrode unit 20 at a constant sweep rate by the measuring unit 32, and measures the current value that responds to the increase or decrease of the potential and flows between the working electrode 21 and the counter electrode 22 of the electrode unit 20. When the measurement is completed, the measured current value data and potential data of the base solution are stored in the storage unit 31. Next, the measurer measures the current value of the object to be learned in the same manner as the measurement of the base solution in a state where the electrode unit 20 is placed in a container containing the object to be learned. When the measurement is completed, the measured current value data and potential data of the object to be learned are stored in the storage unit 31. Then, the current value data and potential data of the base solution and the object to be learned stored in the storage unit 31 are transmitted to the learning device 3, and the current value data and potential data of the base solution and the object to be learned received by the storage unit 40 of the learning device 3 are stored.

[0058] When the current value data and potential data of the base solution and the object to be learned are stored in the storage unit 40, numerical data indicating the change in the current value of the object to be learned and the base solution or image data indicating the change in the current value of the object to be learned and the base solution, which are input data to be input to the learning unit 42, are generated by the input data generation unit 41 of the learning device 3. The generated numerical data and image data are stored in the storage unit 40. Next, the measurer inputs, as correct answer data, the free chlorine concentration and pH corresponding to the numerical data indicating the change in the current value of the object to be learned or the image data indicating the change in the current value of the object to be learned generated by the operation unit. The input correct answer data is stored in the storage unit 40. When the input data and the correct answer data are stored in the storage unit 40, the learning unit 42 of the learning device 3 learns the relationship between the change in the current value, the free chlorine concentration, and the pH, and also learns the influence of the electrodes used for measurement and the tap water on the measurement, and generates a learned model. The generated learned model is stored in the storage unit 40 and transmitted to the free chlorine concentration measuring device 2. The free chlorine concentration measuring device 2 receives the learned model and stores it in the storage unit 31.

[0059] [Measurement Method] In the state where the measurement unit 32 is placed in the container containing the measurement target, with the electrode unit 20 also placed in the container containing the learning target and the base solution, the measurement unit 32 increases or decreases the voltage (potential difference) applied between the working electrode 21 and the reference electrode 23 of the electrode unit 20 at a constant sweep rate, and measures the current value that responds to the increase or decrease of the potential and flows between the working electrode 21 and the counter electrode 22 of the electrode unit 20. The measured current value data and potential data of the measurement target are stored in the storage unit 31. The estimation unit 33 estimates the free chlorine concentration and pH of the measurement target using the current value data of the measurement target stored in the storage unit 31 and the learned model. The estimated free chlorine concentration and pH of the measurement target are stored in the storage unit 31. Then, as shown in FIG. 8, the display unit 34 displays the free chlorine concentration of the measurement target stored in the storage unit 31 as a numerical value on the display 13 of the main body 10. Alternatively, the pH is displayed on the display 13 of the main body 10 together with the free chlorine concentration. Further, in the state where the measurement of the current value of the measurement target is completed, the determination unit 35 determines the necessity of replacing the electrode unit 20. As a result of the determination by the determination unit 35, if the electrode unit 20 needs to be replaced, the determination result is displayed on the display 13 via the display unit 34 (not shown).

[0060] [Advantages of the Free Chlorine Concentration Measurement System According to the Present Embodiment] As described above, the free chlorine concentration measurement system 1 according to the present embodiment is a free chlorine concentration measurement system that measures the free chlorine concentration of a measurement target based on the change in the current value obtained by applying a voltage to the electrode unit 20, and includes a measurement unit 32 that measures the change in the current value of the measurement target obtained by applying a voltage to the electrode unit 20, a plurality of current values measured by the measurement unit 32, and an estimation unit 33 that estimates at least the free chlorine concentration of the measurement target using the learned model that has learned the relationship between the change in the current value, the free chlorine concentration, and the pH, and a display unit 34 that displays information regarding the free chlorine concentration estimated by the estimation unit 33.

[0061] According to the free chlorine concentration measurement system 1 having such a configuration, the free chlorine concentration of the measurement target can be accurately measured without adjusting or specifying the pH in advance, so that there is a remarkable advantage that the measurement efficiency is greatly improved.

[0062] In addition, the free chlorine concentration measurement system 1 according to the present embodiment is configured such that the estimation unit 33 estimates the pH of the measurement target using a plurality of current values measured by the measurement unit 32 and a learned model, and the display unit 34 is configured to display the pH together with information regarding the free chlorine concentration estimated by the estimation unit 33. According to the free chlorine concentration measurement system 1 having such a configuration, since the pH can be displayed together with the information regarding the free chlorine concentration of the measurement target, the existence ratio of hypochlorous acid (HOCl) and hypochlorite ion (ClO - ) can be confirmed, and there is an advantage that it is possible to more accurately determine whether or not the measurement target has bactericidal power and to determine the strength of the bactericidal power.

[0063] Furthermore, the free chlorine concentration measurement system 1 according to the present embodiment is configured such that the display unit 34 displays the free chlorine concentration as a numerical value. According to the free chlorine concentration measurement system 1 having such a configuration, since the free chlorine concentration can be displayed as a numerical value, there is an advantage that it is possible to easily determine whether or not the free chlorine concentration of the measurement target conforms to a specified reference value.

[0064] In addition, the free chlorine concentration measurement system 1 according to the present embodiment further includes a learning unit 42 that learns the relationship between the change in the current value, the free chlorine concentration, and the pH based on the input data indicating the change in the current value of the learning target obtained by applying a voltage to the electrode unit 20 and the correct answer data indicating the free chlorine concentration and the pH corresponding to the change in the current value of the learning target, and generates a learned model. According to the free chlorine concentration measurement system 1 having such a configuration, since the learning unit 42 is included in the system, there is an advantage that the learning accuracy is improved.

[0065] Furthermore, the free chlorine concentration measurement system 1 according to the present embodiment has input data that is numerical data indicating a change in current value or image data of a current-potential curve indicating a change in current value. According to the free chlorine concentration measurement system 1 having such a configuration, there is an advantage that more suitable input data can be selected according to the purpose of measurement.

[0066] Also, in the free chlorine concentration measurement system 1 according to the present embodiment, the electrode unit 20 includes a working electrode 21 and a counter electrode 22, and the working electrode 21 and the counter electrode 22 are printed electrodes obtained by printing conductive ink on a substrate 24 made of an insulating material. Further, the electrode unit 20 further includes a reference electrode 23, and the reference electrode 23 is a printed electrode obtained by printing silver ink on the substrate 24. According to the free chlorine concentration measurement system 1 having such a configuration, since the working electrode 21, the counter electrode 22, and the reference electrode 23 are printed electrodes, the cost related to the manufacture of the electrodes can be reduced, and the work at the time of electrode replacement can be easily performed.

[0067] Furthermore, the free chlorine concentration measurement system 1 according to the present embodiment further includes a free chlorine concentration measurement device 2 having at least the electrode unit 20, and the free chlorine concentration measurement device 2 is of a handy type. According to the free chlorine concentration measurement system 1 having such a configuration, since the free chlorine concentration measurement device 2 can be carried around, there is an advantage that the convenience at the time of measurement is improved.

[0068] [Modification Example] Although the preferred embodiments of the present invention have been described above, the technical scope of the present invention is not limited to the scope described in the above embodiments. Various changes or improvements can be made to the above embodiments.

[0069] For example, in the above-described embodiment, the display unit 34 has been described as being configured to display the pH together with information regarding the free chlorine concentration estimated by the estimation unit 33, but the present invention is not limited to this, and a mode of displaying only the free chlorine concentration or only the pH may be employed.

[0070] In the above-described embodiments, the display unit 34 has been described as being configured to display the free chlorine concentration as a numerical value. However, the present invention is not limited to this, and it may be a display mode that displays "high", "medium", "low", "acceptable", "unacceptable", etc.

[0071] Furthermore, in the above-described embodiments, the working electrode 21 and the counter electrode 22 have been described as being printed electrodes in which conductive ink is printed on a substrate made of an insulating material. However, the present invention is not limited to this, and they may be metal electrodes or merely carbon electrodes.

[0072] Also, in the above-described embodiments, the reference electrode 23 has been described as being a printed electrode in which silver ink is printed on the substrate 24. However, the present invention is not limited to this, and any electrode such as a mere silver-silver chloride electrode may be used.

[0073] Furthermore, in the above-described embodiments, the working electrode 21, the counter electrode 22, and the reference electrode 23 have been described as being printed electrodes formed in a pattern on a common substrate 24. However, the present invention is not limited to this, and they may be three independent electrodes, or only the working electrode 21 may be a printed electrode, and the counter electrode 22 and the reference electrode 23 may be electrodes other than printed electrodes.

[0074] Also, in the above-described embodiments, the electrode unit 20 has been described as including one working electrode 21. However, the present invention is not limited to this, and it may be configured to include a plurality (for example, two or three) of working electrodes 21.

[0075] Furthermore, in the above-described embodiments, the teacher data has been described as being generated by the learning device 3. However, the present invention is not limited to this, and the teacher data may be generated by the free chlorine concentration measuring device 2.

[0076] Also, in the above-described embodiments, the learning unit 42 has been described as being provided in the learning device 3. However, the present invention is not limited to this, and the learning unit 42 may be provided in the free chlorine concentration measuring device 2, and the learning device 3 may function as a device that generates and stores input data and correct data.

[0077] Furthermore, in the above-described embodiment, the learning unit 42 has been described as being provided in the learning device 3, but the present invention is not limited thereto. A learning server including the learning unit 42 may be further provided, and the learning device 3 may function as a device that generates and stores input data and correct answer data.

[0078] Also, in the above-described embodiment, the estimation unit 33 has been described as being provided in the free chlorine concentration measuring device 2, but the present invention is not limited thereto. The estimation unit 33 may be provided in the learning device 3, and the free chlorine concentration and pH of the measurement target estimated by the learning device 3 may be transmitted to the free chlorine concentration measuring device 2 and displayed on the display 13 of the free chlorine concentration measuring device 2.

[0079] Furthermore, in the above-described embodiment, the free chlorine concentration measuring device 2 has been described as being a handy type, but the present invention is not limited thereto, and the free chlorine concentration measuring device 2 may be a stationary type.

[0080] Also, in the present embodiment, the input data generation unit 41 has been described as generating numerical data indicating a change in current value, but the present invention is not limited thereto, and a mode in which a measurer inputs current value data from the operation unit of the learning device 3 may be employed.

[0081] It is apparent from the description of the claims that such modifications are included in the scope of the present invention.

Description of Reference Numerals

[0082] 1: Free chlorine concentration measurement system 2: Free chlorine concentration measuring device 3: Learning device 10: Main body 11: Gripping part 12: Operation button 13: Display 20: Electrode part 21: Working electrode 22: Counter electrode 23: Reference electrode 24: Substrate 30: Control Unit 31: Memory Unit 32: Measurement Unit 33: Estimation Unit 34: Display Unit 35: Judgment Unit 36: Communication Unit 40: Memory Unit 41: Input Data Generation Unit 42: Learning Unit 43: Communication Unit NW: Communication Network

Claims

1. A free chlorine concentration measurement system for measuring the free chlorine concentration of a measurement target based on a change in a current value obtained by applying a voltage to an electrode unit, comprising: a measurement unit that measures a change in the current value of the measurement target obtained by applying a voltage to the electrode unit; an estimation unit that estimates at least the free chlorine concentration of the measurement target using a plurality of current values measured by the measurement unit and a learned model that has learned the relationship between the change in the current value, the free chlorine concentration, and pH; a display unit that displays information regarding the free chlorine concentration estimated by the estimation unit A free chlorine concentration measurement system, characterized by comprising the above.

2. The estimation unit is configured to estimate the pH of the measurement target using a plurality of current values measured by the measurement unit and the learned model, The display unit is configured to display the pH together with information regarding the free chlorine concentration estimated by the estimation unit The free chlorine concentration measurement system according to claim 1, characterized by the above.

3. The display unit is configured to display the free chlorine concentration as a numerical value The free chlorine concentration measurement system according to claim 1 or 2, characterized by the above.

4. A learning unit that further includes a learning unit that learns the relationship between the change in the current value, the free chlorine concentration, and pH based on input data indicating the change in the current value of the learning target obtained by applying a voltage to the electrode unit and correct data indicating the free chlorine concentration and pH corresponding to the change in the current value of the learning target, and generates a learned model The free chlorine concentration measurement system according to any one of claims 1 to 3, characterized by the above.

5. The input data is numerical data indicating a change in the current value or image data of a current-potential curve indicating a change in the current value The free chlorine concentration measurement system according to claim 4, characterized by the above.

6. The electrode unit includes a working electrode and a counter electrode, The working electrode and the counter electrode are printed electrodes obtained by printing conductive ink on a substrate made of an insulating material The free chlorine concentration measurement system according to any one of claims 1 to 5, characterized by the above.

7. The electrode unit further includes a reference electrode, The reference electrode is a printed electrode obtained by printing silver ink on the substrate The free chlorine concentration measurement system according to claim 6, characterized by the above.

8. Further comprising a free chlorine concentration measurement device having at least the electrode unit, The free chlorine concentration measurement device is of a handy type The free chlorine concentration measurement system according to any one of claims 1 to 7, characterized in that...

9. A measurement process for measuring changes in the current value of the measurement target obtained by applying a voltage to the electrode unit, An estimation process for estimating at least the free chlorine concentration of the measurement target using the measured plurality of current values, a learned model that has learned the relationship between the change in the current value, the free chlorine concentration, and pH, A display process for displaying information regarding the estimated free chlorine concentration To be executed by a free chlorine concentration measuring device A free chlorine concentration measurement program, characterized in that...

10. A free chlorine concentration measurement method for measuring the free chlorine concentration of a measurement target based on changes in the current value obtained by applying a voltage to the electrode unit, A measurement step of measuring changes in the current value of the measurement target obtained by applying a voltage to the electrode unit, An estimation step of estimating at least the free chlorine concentration of the measurement target using the measured plurality of current values and a learned model that has learned the relationship between the change in the current value, the free chlorine concentration, and pH, A display step of displaying information regarding the estimated free chlorine concentration, A free chlorine concentration measurement method, characterized by including...

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