Pressure sensor calibration method and pressure sensor calibration system

Abstract

To suppress the time and effort required for calibrating a plurality of pressure sensors.SOLUTION: A method for calibrating a plurality of pressure sensors installed on a target device includes a calibration formula calculation step and a calibration step. In the calibration formula calculation step, a first measurement process in which the target device placed on an actual pressure measuring device having a pressure-sensitive sheet is pressed with a first force amount is performed, and a second measurement process in which the target device is pressed with a second force amount greater than the first force amount is performed. The images of the pressure-sensitive sheet after execution of the first measurement process and the second measurement process are analyzed to calculate the actual pressure within a predetermined range of the pressure-sensitive sheet. A calibration formula for each of the plurality of pressure sensors is calculated from the relationship between the measured values of the plurality of pressure sensors in each of the first measurement process and the second measurement process and the actual pressure in the predetermined range corresponding to each of the plurality of pressure sensors. In the calibration step, the measured value of the first pressure sensor is calibrated using the calibration formula of the first pressure sensor.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a pressure sensor calibration method and a pressure sensor calibration system. [Background technology]

[0002] In recent years, pressure sensors are often attached to various objects. For example, research is being conducted on estimating the movement of a subject's hand from the pressure measured by a glove equipped with multiple pressure sensors attached to the subject. For example, the movement is estimated based on the measurements of the multiple pressure sensors, such as the shape of the fingers and the state of gripping, such as how the fingers are bent or whether the fingers are gripping something.

[0003] Depending on how the pressure sensor is attached, it may show different values ​​even when the same pressure is applied. In addition, pressure sensors may show different values ​​even when the same pressure is applied due to individual differences and deterioration. Therefore, multiple pressure sensors need to be calibrated to measure the difference between the actual measured value and the actual pressure.

[0004] Techniques relating to the calibration of pressure sensors are disclosed, for example, in the following: [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 09-079932 [Patent Document 2] Japanese Patent Application Publication No. 09-079931 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the calibration of the pressure sensor may be performed multiple times in a short period of time because the measured pressure may vary due to deterioration or the usage state. Therefore, it is preferable that the calibration of the pressure sensor can be performed in as short a time as possible. It is also preferable that the preparation for the calibration of the pressure sensor can be performed in as short a time as possible with as little effort as possible.

[0007] Therefore, one disclosure provides a pressure sensor calibration method and a pressure sensor calibration system that can reduce the time and effort required to calibrate multiple pressure sensors. [Means for solving the problem]

[0008] One disclosure relates to a pressure sensor calibration method for calibrating a plurality of pressure sensors attached to a target device, the method including a calibration formula calculation step and a calibration step, in which a first measurement step is performed in which the target device placed on a real pressure measuring device having a pressure-sensitive sheet is pressed with a first force, and a second measurement step is performed in which the target device is pressed with a second force greater than the first force, an image of the pressure-sensitive sheet after each of the first measurement step and the second measurement step is performed is analyzed to calculate an actual pressure within a predetermined range of the pressure-sensitive sheet, a calibration formula for each of the plurality of pressure sensors is calculated from the relationship between the measurement values ​​of the plurality of pressure sensors in each of the first measurement step and the second measurement step and the actual pressures within the predetermined range corresponding to each of the plurality of pressure sensors, and in the calibration step, the measurement value of the first pressure sensor is calibrated using the calibration formula for the first pressure sensor.

[0009] One disclosure relates to a pressure sensor calibration method in which the real pressure measuring device has a calibration board having a target device type with a shape of the target device written on it, and in the first measurement process and the second measurement process, the target device is placed according to the target device type.

[0010] One disclosure relates to a pressure sensor calibration method, wherein the calibration board further has an unevenness absorbing portion that absorbs unevenness of the target device or unevenness generated when the target device is used.

[0011] One disclosure relates to a pressure sensor calibration method, wherein the calibration equation is a regression equation obtained by linearly interpolating the logarithm of the measurement value of the pressure sensor in the first measurement process and the second measurement process and the logarithm of the actual pressure in the specified range.

[0012] One disclosure relates to a pressure sensor calibration method in which, when the pressure sensor outputs a measurement value at a predetermined time interval, the median of the measurement values ​​during the first measurement process and the second measurement process is regarded as the measurement value of the pressure sensor, and, when multiple actual pressures are detected within the predetermined range, the average value of the multiple detected actual pressures is regarded as the actual pressure within the predetermined range.

[0013] One disclosure relates to a pressure sensor calibration system that calibrates a plurality of pressure sensors attached to a target device, the pressure sensor calibration system having an actual pressure measuring device having a pressure-sensitive sheet and performing a first measurement process in which the placed target device is pressed with a first force and a second measurement process in which the target device is pressed with a second force greater than the first force, a calibration equation calculation process that analyzes an image of the pressure-sensitive sheet after each of the first measurement process and the second measurement process is performed, calculates the actual pressure of the pressure-sensitive sheet within a predetermined range, and calculates a calibration equation for each of the plurality of pressure sensors from the relationship between the measurement values ​​of the plurality of pressure sensors in each of the first measurement process and the second measurement process and the actual pressures in the predetermined range corresponding to each of the plurality of pressure sensors, and a calibration process that calibrates the measurement value of the first pressure sensor using the calibration equation of the first pressure sensor. Effect of the Invention

[0014] One aspect of the present invention can reduce the time and effort required to calibrate multiple pressure sensors. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a diagram showing an example of the configuration of a pressure sensor calibration system 1000. [Diagram 2]FIG. 2 is a diagram showing an example of the configuration of a pressure sensor calibration device 200. [Diagram 3] FIG. 3 is a diagram showing an example of the configuration of an actual pressure measuring device 300. As shown in FIG. [Figure 4] FIG. 4 is a diagram showing an example of the calibration board 320. As shown in FIG. [Diagram 5] FIG. 5 is a diagram showing an example of the configuration of the calibration target device 100. As shown in FIG. [Figure 6] FIG. 6 is a diagram illustrating an example of a processing flowchart of the calibration equation calculation process. [Figure 7] FIG. 7 is a diagram showing an example in which the calibration target device 100 is set on the actual pressure measuring device 300. As shown in FIG. [Figure 8] FIG. 8 is a diagram showing an example of measurement data obtained by the actual pressure measuring device 300. As shown in FIG. [Figure 9] FIG. 9 is a diagram showing an example of measurement values ​​of the pressure sensor. [Figure 10] FIG. 10 is a diagram showing an example of the calibration formula. [Figure 11] FIG. 11 is a diagram showing an example of a process flowchart of the pressure sensor calibration process S200. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] [First embodiment] A first embodiment will be described.

[0017] <Configuration example of pressure sensor calibration system 1000> 1 is a diagram showing an example of the configuration of a pressure sensor calibration system 1000. The pressure sensor calibration system 1000 is a system that calibrates the measurement value of a pressure sensor of an apparatus that includes (is attached to) a pressure sensor to be calibrated (hereinafter, may be referred to as an apparatus to be calibrated).

[0018] The pressure sensor calibration system 1000 includes a calibration target device 100, a pressure sensor calibration device 200, and an actual pressure measurement device 300. Each device is connected, for example, by wire. Also, each device may be connected or disconnected, for example, as needed.

[0019] The real pressure measuring device 300 is a device that measures the real pressure (the pressure that is actually applied) applied to the calibration target device 100. The real pressure measuring device 300 is a device that measures the pressure applied within a predetermined range, and is, for example, a pressure measuring instrument that uses a pressure-sensitive sheet.

[0020] The calibration target device 100 is a device or an article having a plurality of pressure sensors. For example, the calibration target device 100 is a glove with pressure sensors attached at positions corresponding to the fingers, joints, palm, etc. Below, the calibration target device 100 will be described using a glove as an example, but the calibration target device 100 may be another device or article.

[0021] The pressure sensor calibration device 200 is a device that calibrates the measurement value of a pressure sensor attached to the calibration target device 100, and is, for example, a computer or a server machine. The pressure sensor calibration device 200 acquires the actual pressure measured by the actual pressure measuring device 300 and the measurement value of the pressure sensor of the calibration target device 100 when pressure is applied to the calibration target device 100. The pressure sensor calibration device 200 then calculates an equation (hereinafter, may be referred to as a calibration equation) to be used for calibration from the actual pressure and the measurement value of the pressure sensor. The pressure sensor calibration device 200 then calibrates the measurement value of the pressure sensor of the calibration target device 100 using the calibration equation. Note that although the calibration of the pressure sensor is performed by the pressure sensor calibration device 200, some processing may be performed by a person (an examiner).

[0022] <Configuration Example of Pressure Sensor Calibration Device 200> 2 is a diagram showing an example of the configuration of the pressure sensor calibration device 200. The pressure sensor calibration device 200 includes a CPU (Central Processing Unit) 210, a storage 220, a memory 230, a communication circuit 240, and a display 250.

[0023] The storage 220 is an auxiliary storage device that stores programs and data, such as a flash memory, a hard disk drive (HDD), or a solid state drive (SSD). The storage 220 stores an actual pressure measurement program 221, a pressure sensor measurement program 222, a calibration equation calculation program 223, and a pressure sensor calibration program 224.

[0024] The memory 230 is an area into which the programs stored in the storage 220 are loaded. The memory 230 may also be used as an area in which the programs store data.

[0025] The communication circuit 240 is a circuit that connects to the pressure sensor of the calibration target device 100 and the actual pressure measuring device 300, and is, for example, a wired circuit.

[0026] The display 250 is a device that displays (outputs) the calibration result (the pressure value after calibration), and is, for example, a liquid crystal monitor. Note that the pressure sensor calibration device 200 may output the calibration result as a file in addition to or instead of the display 250. Furthermore, the pressure sensor calibration device 200 may output the calibration formula, the actual pressure measurement, and the like, in addition to the calibration result.

[0027] The CPU 210 is a processor that loads programs stored in the storage 220 into the memory 230, executes the loaded programs, configures each unit, and realizes each process.

[0028] The CPU 210 executes the real pressure measurement program 221 to construct a measurement unit and perform real pressure measurement processing. The real pressure measurement processing is processing for measuring the real pressure acting on the calibration target device 100 using the real pressure measurement device 300. In the real pressure measurement processing, for example, a tester places the calibration target device 100 on the real pressure measurement device 300 and applies force from above the calibration target device 100 to measure the real pressure acting on the calibration target device 100.

[0029] The CPU 210 executes the image analysis module 2211 of the real pressure measurement program 221 to construct an image analysis unit and perform image analysis processing. The image analysis processing is used, for example, when the real pressure measurement device 300 has a measurement surface (e.g., a pressure-sensitive sheet) whose color changes depending on the pressure applied. The pressure sensor calibration device 200 photographs (or acquires as data) the measurement surface whose color has changed after measurement, performs image analysis processing, and calculates a predetermined range on the measurement surface (e.g., corresponding to the position and size of each pressure-sensitive sensor) and the pressure applied to the predetermined range.

[0030] The CPU 210 executes the pressure sensor measurement program 222 to construct a measurement unit and perform pressure sensor measurement processing. The pressure sensor measurement processing is processing for acquiring a measurement value of a pressure sensor possessed by the calibration target device 100. For example, in the pressure sensor measurement processing, the pressure sensor calibration device 200 measures a pressure corresponding to an actual pressure (at the actual pressure measurement timing) when an actual pressure measurement processing is executed. In the pressure sensor measurement processing, the pressure sensor calibration device 200 acquires a measurement value for each pressure sensor. Note that in the operation stage after calibration, the pressure sensor measurement processing may be executed at a time other than when the actual pressure measurement processing is executed.

[0031] The CPU 210 executes the calibration equation calculation program 223 to construct a calculation unit and perform a calibration equation calculation process. The calibration equation calculation process is a process for calculating a calibration equation for calibrating the measurement value of the pressure sensor of the calibration target device 100. The pressure sensor calibration device 200 calculates a calibration equation for each pressure sensor using the measurement value of the pressure sensor corresponding to the actual pressure.

[0032] The CPU 210 executes the pressure sensor calibration program 224 to construct a calibration unit and perform pressure sensor calibration processing. The pressure sensor calibration processing is processing for calibrating the measurement values ​​of the pressure sensors of the calibration target device 100 during actual operation. The pressure sensor calibration processing is processing for calibrating the measurement values ​​of each pressure sensor using a calculated calibration formula and outputting the calibrated values.

[0033] <Configuration example of actual pressure measuring device 300> 3 is a diagram showing an example of the configuration of a real pressure measuring device 300. The real pressure measuring device 300 has a plurality of pressure-sensitive sheets 310 and a calibration board 320 (a board for calibration).

[0034] The pressure-sensitive sheet 310 is a sheet that changes color according to the pressure applied from the direction of the arrow. The pressure-sensitive sheet is coated with a color developer, and colorless ink seeps out from capsules that are broken by pressure and reacts chemically with the color developer to develop color.

[0035] 4 is a diagram showing an example of the calibration board 320. The calibration board 320 is a board that indicates the position on which the calibration target device 100 is placed. The calibration board 320 is made of, for example, a hard board (for example, a plastic board).

[0036] On the calibration board 320, for example, a calibration target device model 321 is drawn assuming that calibration will be performed repeatedly. By placing (placing) the calibration target device 100 on the outlined calibration target device model 321, the tester can place the calibration target device 100 in the same position each time even when performing calibration processing multiple times, and can measure the actual pressure of the pressure sensor using the same coordinates. For example, if the calibration target device 100 is a glove, the calibration target device model 321 is the shape of a hand.

[0037] The calibration board 320 also has, for example, a plurality of unevenness absorbing parts 322. The unevenness absorbing parts 322 are, for example, parts that are attached to parts that are difficult to press against a flat pressure-sensitive sheet, and rubber plates or the like are used. When measuring a pressure sensor attached to a glove, the unevenness absorbing parts 322 are attached to, for example, finger joints or recessed parts near the center of the palm. The unevenness absorbing parts 322 absorb unevenness of the calibration target device 100 or unevenness generated when the calibration target device 100 is used, and prevent the pressure of the recessed parts from being measured at a very small value (or not being measured) or the pressure of the protruding parts from being measured at a very large value. This allows measurements to be made with the same pressure for the recessed parts and the protruding parts.

[0038] 3, the calibration board 320 is located at the bottom of the real pressure measuring device 300. This is because the pressure-sensitive sheet 310 is transparent, so that the calibration target device model 321 on the bottom calibration board 320 can be seen from above. If the pressure-sensitive sheet is not transparent, the calibration board 320 may be located at the top, for example. In this case, the calibration board is made of soft paper, vinyl, or the like to prevent any effect on the actual pressure to be measured.

[0039] <Configuration Example of Calibration Target Device 100> 5 is a diagram showing a configuration example of the calibration target device 100. The calibration target device 100 is, for example, a glove. Two types of pressure sensors are attached to the glove. The pressure sensors are palm sensors, and for example, 30 sensors are attached to the fingers or palm. The pressure sensors are joint sensors, and for example, 15 sensors are attached to the joints of the fingers or palm. Each pressure sensor is connected to the pressure sensor calibration device 200 by wire, for example, and transmits a measurement value at a predetermined time interval (for example, every 0.1 seconds).

[0040] The unevenness absorbing portion 322 of the calibration board 320 is disposed, for example, at the mounting position of the indirect sensor.

[0041] <Calibration formula calculation process> The pressure sensor calibration device 200 executes a calibration equation calculation process S100. The calibration equation calculation process S100 is a process for calculating a calibration equation for each pressure sensor, and includes a process for measuring the measured value and the actual pressure of the pressure sensor.

[0042] Fig. 6 is a diagram showing an example of a processing flowchart of the calibration equation calculation process. An examiner sets the calibration target device 100 on the real pressure measuring device 300 (S101). Fig. 7 is a diagram showing an example of setting the calibration target device 100 on the real pressure measuring device 300. As shown in Fig. 7, an examiner places (installs) the calibration target device 100 on the real pressure measuring device 300.

[0043] Returning to the process flowchart of FIG. 6, the tester and the pressure sensor calibration device 200 perform the measurement process (S102).

[0044] The measurement process is a process for measuring the actual pressure and the measured value of the pressure sensor. The tester fits the surface of the hand to the shape of the calibration target device 100 (glove) shown in FIG. 7 and presses (presses) from above. The pressing is performed for, for example, 5 seconds. The pressing force is weak in the first measurement process and strong in the second measurement process. "Weak" and "strong" may be subjective values ​​of the tester, but "weak force" (first force) is smaller in pressure than "strong force" (second force). The measurement order of "strong" and "weak" may be reversed. The difference between "strong force" and "weak force" is preferably as large as possible because they are used later to calculate a regression equation (calibration equation) using linear interpolation.

[0045] In the measurement process S102, the pressure sensor calibration device 200 acquires measurement data (image data of the pressure-sensitive sheet) by the actual pressure measuring device 300 and measurement values ​​of the pressure sensor. Then, the pressure sensor calibration device 200 performs image analysis processing on the measurement data by the actual pressure measuring device 300 to acquire the actual pressure.

[0046] If the measurement process is the first time (Yes in S103), the tester and the pressure sensor calibration device 200 perform the measurement process again (S102). When the second measurement process is completed (No in S103), the tester and the pressure sensor calibration device 200 calculate the calibration formula from the measurement value (S104) and end the process.

[0047] FIG. 8 is a diagram showing an example of measurement data by the real pressure measuring device 300. FIG. 8(A) is a diagram showing an example of image data around the index finger. In FIG. 8(A), the darker the color, the higher the real pressure. Alternatively, FIG. 8(A) shows the real pressure according to the color. Alternatively, range 1 shows, for example, the range of the flat sensor 4 (see FIG. 5). According to FIG. 8(A), it can be seen that the real pressure in the second measurement process is stronger than the real pressure in the first measurement process.

[0048] Fig. 8(B) is a diagram showing an example of the result of image analysis of the image data in range 1 of Fig. 8(A). The pressure sensor calibration device 200 uses the average pressure value ("3. Average pressure [MPa]") as the actual pressure of the flat sensor 4.

[0049] The pressure sensor calibration device 200 stores in advance the correspondence between the ranges in the image data and each pressure sensor. As shown in Fig. 4, by recording the calibration target device type 321 on the calibration board 320, it becomes possible to perform actual measurement in the same positional relationship every time, so the pressure sensor calibration device 200 only needs to store the correspondence between the ranges and each pressure sensor once, and does not need to reset the correspondence for each measurement.

[0050] Fig. 9 is a diagram showing an example of pressure sensor measurement values. Fig. 9(A) is a diagram showing an example of time-series measurement values ​​of the pressure sensor. Fig. 9(A) shows that the second measurement value generally indicates a higher value (except for the start and end) than the first measurement value.

[0051] Fig. 9(B) is a diagram showing an example of data obtained by digitizing the measurement values ​​in Fig. 9(A). The pressure sensor calibration device 200 uses the median value ("Med") as the measurement value of the pressure sensor. This is to exclude data at the start and end of the measurement, for example, when there is a large measurement error.

[0052] FIG. 10 is a diagram showing an example of a calibration formula. The pressure sensor calibration device 200 employs a regression formula using linear interpolation as the calibration formula. As shown in the graph of FIG. 10, it is assumed that the logarithm of the pressure sensor measurement value and the logarithm of the actual pressure can be expressed by a linear formula. Equation 1 is a diagram showing an example of the regression formula. Equation 2 is a method for calculating the constant of the regression formula of Equation 1. The pressure sensor calibration device 200 calculates the regression formula of Equation 1 for each pressure sensor and uses it to calibrate the pressure sensor measurement value in actual operation.

[0053] <Pressure sensor calibration process> The pressure sensor calibration device 200 executes a pressure sensor calibration process S200 in actual operation. The pressure sensor calibration process S200 is a process of acquiring a measurement value for each pressure sensor when the calibration target device 100 is in use in actual operation, and calibrating the measurement value using a calibration formula.

[0054] 11 is a diagram showing an example of a process flowchart of the pressure sensor calibration process S200. The pressure sensor calibration device 200 uses the calibration target device 100 in actual operation, and acquires the measured values ​​of each pressure sensor (S201).

[0055] The pressure sensor calibration device 200 calculates a calibration value using the acquired measurement value and a calibration formula (S202). The pressure sensor calibration device 200 uses the calibration formula of the pressure sensor corresponding to the measurement value from among a plurality of calibration formulas that exist for each pressure sensor.

[0056] The pressure sensor calibration device 200 outputs the calculated calibration value (S203). The output is, for example, displayed on a display or output to a file.

[0057] If the measurement is not completed (No in S204), the pressure sensor calibration device 200 repeats steps S201 to S203. If the measurement is completed (Yes in S204), the pressure sensor calibration device 200 ends the process.

[0058] [Other embodiments] The calibration target device 100 may be something other than a glove. Also, the actual pressure measurement device 300 may be something other than the pressure-sensitive sheet shown in the embodiment. For example, instead of a pressure-sensitive sheet that indicates the actual pressure by a difference in color density or color, a pressure-sensitive sheet that indicates the actual pressure by a numerical value or a shape may be used. In this case, the image analysis is not to distinguish the color density or color, but to perform numerical value recognition or shape recognition.

[0059] The calibration formula calculation process is performed as appropriate depending on the type of the calibration target device 100. For example, if the pressure sensor is attached simply and the attachment condition is easily changed, the calibration formula calculation process may be performed frequently in actual operation. For example, if the pressure sensor is attached firmly and the attachment condition is hardly changed, the calibration formula calculation process may be performed at the start of actual operation (for example, once a day). The frequency of the calibration formula calculation process may be performed as appropriate depending on the degree of deterioration of the pressure sensor, the frequency of use of the calibration target device 100, the degree of pressure applied, the frequency of continuous use, etc. [Explanation of symbols]

[0060] 100: Calibration target device 130: Memory 200: Pressure sensor calibration device 210: CPU 220: Storage 221: Actual pressure measurement program 2211: Image analysis module 222: Pressure sensor measurement program 223: Calibration formula calculation program 224: Pressure sensor calibration program 230: Memory 240: Communication circuit 250: Display 300: Actual pressure measuring device 310: Pressure sensitive sheet 320: Calibration board 321: Calibration target device type 322: Bumpy absorption area 1000: Pressure sensor calibration system

Claims

1. 1. A method for calibrating a plurality of pressure sensors attached to a target device, comprising: A calibration formula calculation step and a calibration step, In the calibration equation calculation step, performing a first measurement process in which the target device placed on a real pressure measuring device having a pressure-sensitive sheet is pressed down with a first force, and a second measurement process in which the target device is pressed down with a second force greater than the first force; Analyzing the image of the pressure-sensitive sheet after each of the first measurement process and the second measurement process is performed, and calculating the actual pressure of the pressure-sensitive sheet within a predetermined range; calculating a calibration equation for each of the plurality of pressure sensors from a relationship between the measurement values ​​of the plurality of pressure sensors in each of the first measurement process and the second measurement process and the actual pressures in the predetermined ranges corresponding to each of the plurality of pressure sensors; In the calibration step, The measurement value of the first pressure sensor is calibrated using a calibration formula for the first pressure sensor. Pressure sensor calibration methods.

2. the actual pressure measuring device has a calibration board on which a target device type of the target device is written, In the first measurement process and the second measurement process, the target device is placed in accordance with the target device type. The method for calibrating a pressure sensor according to claim 1.

3. The calibration board further includes an unevenness absorbing portion that absorbs unevenness of the target device or unevenness generated when the target device is used. The pressure sensor calibration method according to claim 2.

4. The calibration equation is a regression equation obtained by linearly interpolating the logarithm of the measured value of the pressure sensor and the logarithm of the actual pressure in the predetermined range in the first measurement process and the second measurement process. The method for calibrating a pressure sensor according to claim 1.

5. When the pressure sensor outputs a measurement value at a predetermined time interval, a median value of the measurement values ​​during the first measurement process and the second measurement process is regarded as the measurement value of the pressure sensor; When a plurality of actual pressures are detected within the predetermined range, the average value of the plurality of detected actual pressures is regarded as the actual pressure within the predetermined range. The method for calibrating a pressure sensor according to claim 1.

6. 1. A system for calibrating a plurality of pressure sensors attached to a target device, comprising: an actual pressure measuring device having a pressure-sensitive sheet, the actual pressure measuring device executing a first measurement process in which the placed target device is pressed with a first force and a second measurement process in which the target device is pressed with a second force greater than the first force; a calibration equation calculation process for analyzing an image of the pressure-sensitive sheet after execution of each of the first measurement process and the second measurement process, calculating an actual pressure of the pressure-sensitive sheet within a predetermined range, and calculating a calibration equation for each of the multiple pressure sensors from the relationship between the measured values ​​of the multiple pressure sensors in each of the first measurement process and the second measurement process and the actual pressures within the predetermined range corresponding to each of the multiple pressure sensors; a calibration process for calibrating a measurement value of a first pressure sensor using a calibration equation of the first pressure sensor; and A pressure sensor calibration system having a

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