JP2019124471A - Magnetic field measurement system, magnetic field measurement method, program, magnetic field measurement device - Google Patents

Abstract

To detect the magnetic field strength simultaneously at each location of an object to be measured, and to evaluate entirely the object to be measured.SOLUTION: A magnetic field measurement system 1 includes: a plurality of switches 101 attached to different positions of an object to be measured and capable of changing the electrical condition at each of the attachment portions; a magnetic field sensor device 110 (sensor unit 111) attached to each of the different positions of the object to be measured to detect the magnetic field at the attachment portion; and a processing apparatus 200 (switch position specifying processing unit 211) which specifies at least one switch 101 from the plurality of switches 101 in accordance with preset requirements, based on the respective magnetic field strengths detected by the plurality of magnetic field sensor devices 110 (sensor units 111) when each of the switches 101 operates to change the electrical condition of the attachment portion.SELECTED DRAWING: Figure 1

Description

  The present invention relates to techniques for measuring magnetic fields.

  Automobiles, aircraft, railway vehicles, etc. are equipped with various electrical components and cables. However, electrical components and cables become sources of various electrical noises and cause problems such as electromagnetic interference. For example, noise includes conductive noise transmitted to a metal part, and noise due to common mode current flowing in a bundled cable, a metal cable tube or the like.

  There is a portable magnetic field measurement device (for example, an electromagnetic field meter) as a device capable of measuring a common mode current or the like which is a generation source of such noise. In addition, there is also a technology of collecting information by communication using a magnetic sensor (for example, Patent Document 1).

JP, 2014-191807, A

The common mode current or the like, which is the source of noise, changes with time. In addition, it is necessary to measure the magnetic field strength at each location of the measurement target such as the car body of the automobile in which the common mode current or the like is generated, and to evaluate the entire measurement target.
However, with a portable magnetic field measurement apparatus or a technique such as that disclosed in Patent Document 1, it is not possible to simultaneously measure the magnetic field strength at a plurality of locations in the measurement object, and therefore it is not possible to evaluate the entire measurement object.

  The object of the present invention is to simultaneously detect the magnetic field strength at each location of the measurement object and to evaluate the measurement object as a whole.

  In order to solve the above problems, according to a first aspect of the present invention, there are provided a plurality of variable means which are attached to different positions of the object to be measured and can change the electrical condition of the attachment portion A plurality of detection means attached to the position to detect the magnetic field of the attachment portion, and each of the magnetic field intensities detected by the plurality of detection means when the variable means operates to change the electrical state of the attachment portion And a specific means for specifying at least one variable means from the plurality of variable means in accordance with preset requirements.

  In the second aspect of the present invention, the plurality of variable means are controlled in operation through wireless communication, and the plurality of detection means provide information of the detected magnetic field strength to the identification means by wireless communication. Is preferred.

  In the third aspect of the present invention, it is preferable that each of the plurality of detection means and each of the plurality of variable means are associated with each other to form a pair, and each pair is attached to a different position of the object to be measured.

  In the fourth aspect of the present invention, preferably, the variable means changes an electrical state by connecting the attachment portion to a ground.

  In the fifth aspect of the present invention, the plurality of detection means detect magnetic field intensity that fluctuates in time, and the identification means sets in advance all the peak values of the magnetic field strength detected by the plurality of detection means. It is preferable to identify the variable means that was operating when the value falls below the specified value.

  In a sixth aspect of the present invention, the plurality of detection means detect magnetic field intensity that fluctuates in time, and the identification means determines an average value of peak values of the magnetic field intensities detected by the plurality of detection means. It is preferable to identify the variable means that was operating when it became the smallest.

  In order to solve the above problems, a seventh aspect of the present invention is an operation control step of operating a plurality of variable means attached to different positions of the object to be measured and capable of changing the electric state of the attached portion; When each of the variable means operates in the operation control step to change the electric state of the attachment portion, a plurality of detection means are attached to different positions of the object to be measured and a plurality of detection means detect the magnetic field of the attachment portion And d) identifying at least one of the plurality of variable means in accordance with preset requirements based on each magnetic field intensity.

  In order to solve the above problem, according to an eighth aspect of the present invention, the operation control means operates a plurality of variable means which are attached to different positions of the object to be measured and which can change the electrical condition of the attached portion. The operation control step and the identification means are attached to different positions of the object to be measured when the variable means are operated to change the electrical condition of the attachment portion in the operation control step, and the magnetic field of the attachment portion is It is a program which makes a computer execute an identification step which specifies at least one variable means from a plurality of variable means based on each magnetic field intensity which a plurality of detection means to detect detect according to a preset requirement.

  In order to solve the above problems, a ninth aspect of the present invention is a variable means attached to a measurement object and operated through wireless communication to be able to change the electrical state of the attachment portion, and the measurement object It is a magnetic field measuring device which is attached, detects the magnetic field of the attachment part, and has a detection means which transmits the detected value by wireless communications as one.

  According to the first, seventh and eighth aspects of the present invention, the magnetic field measurement system can simultaneously detect the magnetic field strength at a plurality of points of the measurement object by using a plurality of detection means, and a plurality of measurement objects may be evaluated as a whole. It is possible to obtain the result of specifying at least one variable means and the mounting position of the variable means from the variable means of.

  According to the second aspect of the present invention, the magnetic field measurement system operates the plurality of variable means by wireless communication, and acquires the information of the magnetic field intensity from the plurality of detection means by wireless communication. It is possible to arrange the plurality of variable means and the plurality of detection means with respect to the measurement object with a high degree of freedom without the complication of arranging the means and the plurality of detection means with a cable and arranging the measurement object.

  According to the third aspect of the present invention, the magnetic field measurement system can manage the plurality of variable means and the plurality of detection means as a pair, and can easily manage the plurality of variable means and the plurality of detection means.

  According to the fourth aspect of the present invention, the magnetic field measurement system can easily change the electrical state of the attachment point by connecting the attachment point of the variable means in the measurement object to the ground.

  According to the fifth aspect of the present invention, the magnetic field measurement system can easily identify the variable means according to the requirement that all the peak values of the magnetic field strength become less than or equal to a preset value.

  According to the sixth aspect of the present invention, the magnetic field measurement system can easily specify the variable means according to the requirement that the average value of the peak values of the magnetic field intensities is minimized.

  According to the ninth aspect of the present invention, the detection device operates the variable means by wireless communication, and in order to enable acquisition of information of magnetic field intensity from the detection means by wireless communication, the variable means and It is possible to arrange the variable means and the detection means with respect to the object to be measured with a high degree of freedom without the complexity of connecting the detection means with a cable and arranging the object on the object of measurement.

FIG. 1 is a block diagram showing a configuration example of a magnetic field measurement system. FIG. 2 is a block diagram showing a configuration example of a magnetic field sensor device. FIG. 3 is a view showing an example of arrangement of a sensor system on a car. FIG. 4 is a diagram showing an example of a sensor system. FIG. 5 is a view showing an arrangement example of the sensor system shown in FIG. FIG. 6 is a block diagram showing a configuration example of a processing device. FIG. 7 is a flowchart showing an example of the switch position identification process.

Embodiments of the present invention will be described with reference to the drawings.
In the present embodiment, a magnetic field measurement system is mentioned.

(Constitution)
FIG. 1 is a block diagram showing a configuration example of the magnetic field measurement system 1.
As shown in FIG. 1, the magnetic field measurement system 1 includes a plurality (N) of sensor systems 100 and a processing device 200. Here, the plurality of sensor systems 100 and the processing device 200 can be communicated by the wireless communication line 300. For example, the wireless communication line 300 is a communication line using a communication technology (impulse radio method) using a wide band short wave band.

  The sensor system 100 includes a magnetic field sensor device 110, a switch 101, and a communication unit 102. Here, each sensor system 100 includes the magnetic field sensor device 110 and the switch 101 as a pair (group or group). Moreover, the sensor system 100 is attached to mutually different positions with respect to a measuring object. For example, the measurement target is a car body of a car, and the sensor system 100 is attached to a part where a current is generated or flows in the car, for example, each place in an electrical component, a cable or the like. The magnetic field sensor device 110 detects the magnetic field strength of the attachment point (attachment site or attachment portion) of the magnetic field sensor device 110 in the measurement target.

FIG. 2 is a block diagram showing a configuration example of the magnetic field sensor device 110. As shown in FIG.
As shown in FIG. 2, the magnetic field sensor device 110 includes a sensor unit 111 and a processing unit 112. Here, the sensor unit 111 is a magnetic field sensor, and detects the magnetic field strength of the attachment point of the magnetic field sensor device 110 in the measurement target. For example, the sensor unit 111 is a three-axis magnetic field sensor. The processing unit 112 performs various processes on the magnetic field detection value of the sensor unit 111. The various types of processing are processing performed on the magnetic field detection value of the sensor unit 111 for transmission by wireless communication, processing for enabling the processing device 200 to process the magnetic field detection value of the sensor unit 111, and the like. Specifically, the processing unit 112 acquires the peak value of the magnetic field detection value of the sensor unit 111 as one of various types of processing. For example, the processing unit 112 acquires a peak value (peak value of magnetic field strength) of the amplitude in the frequency spectrum based on the magnetic field detection value of the sensor unit 111 by FFT (Fast Fourier Transform) processing.

  In FIG. 1, the switch 101 connects (turns on) or disconnects (turns off) the attachment point of the switch 101 in the measurement target to the ground. All the switches 101 are always off and not connected to the ground. The communication unit 102 communicates with another device such as the processing device 200 via the wireless communication line 300. The communication unit 102 is shared by the magnetic field sensor device 110 and the switch 101, or separately provided by the magnetic field sensor device 110 and the switch 101. The magnetic field sensor device 110 transmits the peak value of the magnetic field intensity by the communication unit 102.

FIG. 3 is a view showing an arrangement example of each sensor system 100 in a vehicle body 1000 of an automobile to be measured.
As shown in FIG. 3, each sensor system 100 is appropriately disposed at a different position on the vehicle body 1000 of the vehicle to be measured.

FIG. 4 is a diagram showing an example of the sensor system 100. As shown in FIG.
As shown in FIG. 4, in the present example, the magnetic field sensor device 110 and the switch 101 are paired and positioned close to each other and attached to a cable (cable tube) 1001. Further, in the present example, the magnetic field sensor device 110 is a wireless magnetic field sensor device, and the switch 101 is a wireless switch, each of which has the communication unit 102 independently.

FIG. 5 is a view showing an arrangement example of the sensor system 100 shown in FIG.
As shown in FIG. 5, each sensor system 100 in which the magnetic field sensor device 110 and the switch 101 are paired and disposed close to each other is attached to a cable (cable tube) 1002 disposed under the floor of the vehicle body 1000. It is done.

FIG. 6 is a block diagram showing a configuration example of the processing device 200. As shown in FIG. The processing device 200 is a device that performs arithmetic processing, and is, for example, a personal computer.
As shown in FIG. 6, the processing device 200 includes a communication unit 201, an operation unit 202, a storage unit 203, a display unit 204, and a processing unit 210. Here, the communication unit 201 communicates with another device such as the sensor system 100 via the wireless communication line 300. The operation unit 202 is, for example, a keyboard, a mouse or the like. The display unit 204 is, for example, a monitor. The storage unit 203 is, for example, an HDD, and stores various data and various programs. The processing unit 210 executes various processes in the processing device 200. The processing unit 210 includes, for example, a microcomputer and its peripheral circuits, and is configured of, for example, a CPU, a ROM, a RAM, and the like. One or more programs are stored in the ROM. The CPU executes various processes in accordance with one or more programs stored in the ROM. Then, the processing unit 210 executes various processes according to various data and various programs stored in the storage unit 203 as necessary. As shown in FIG. 6, the processing unit 210 has a switch position specification processing unit 211. The switch position specification processing unit 211 performs switch position specification processing for specifying the switch 101 at a position where it is desirable to connect to the ground in the measurement target.

FIG. 7 is a flowchart showing an example of the switch position identification process.
As shown in FIG. 7, first, in the process of step S1, the switch position specification processing unit 211 initializes n to 0 (n = 0).
As the process of the subsequent step S2, the switch position specification processing unit 211 adds 1 to n (n = n + 1).

In the subsequent step S3, the switch position specification processing unit 211 turns on the switch 101 of the n-th sensor system 100 by wireless communication using the communication unit 201. Thereby, the attachment point of the switch 101 in the measurement object is connected to the ground.
In the subsequent step S4, the switch position specification processing unit 211 performs wireless communication by all the sensor systems 100 and the communication unit 201 attached to the measurement target, and the magnetic field detection values of the magnetic field sensor devices 110 of all the sensor systems 100. Acquire the peak value of (magnetic field strength). Thereby, the switch position specification processing unit 211 acquires all peak values of the magnetic field detection values of the magnetic field sensor devices 110 when the switch 101 is turned on in step S3. For example, the switch position specification processing unit 211 sequentially accesses each sensor system 100 at preset sampling time intervals to acquire peak values of magnetic field detection values of each magnetic field sensor device 110 one after another.

In the subsequent step S5, the switch position specification processing unit 211 stores data of the peak value of the magnetic field detection value acquired in step S4 in the storage unit 203.
In the subsequent processing of step S6, the switch position specification processing unit 211 turns off the switch 101 turned on in step S5.

  In the subsequent step S7, the switch position specification processing unit 211 determines whether n has become N or not. That is, the switch position specification processing unit 211 determines whether or not the processes of steps S3 to S6 have been performed for all the sensor systems 100 (N sensor systems 100). If the switch position specification processing unit 211 determines that n has become N (n = N), the process proceeds to step S8. On the other hand, when determining that n is not N (n <N), the switch position specification processing unit 211 restarts the process from step S2. That is, for example, as the process of step S2, the switch position specification processing unit 211 adds 1 to n again (n = n + 1).

  As the process of step S8, the switch position specification processing unit 211 performs comparison processing. Specifically, in the comparison process, when the switch position specification processing unit 211 turns on the switch 101 in the process of step S3, each of all the magnetic field sensor devices 110 stored in the storage unit 203 in the process of step S5. The peak value of the magnetic field detection value is compared with the threshold value. That is, for example, the switch position specification processing unit 211 sets the peak value and the threshold value of the magnetic field detection values of all the magnetic field sensor devices 110 when the switch 101 of the first (n = 1) sensor system 100 is turned on. Compare. Next, the switch position specification processing unit 211 sets the peak value and the threshold value of the magnetic field detection values of all the magnetic field sensor devices 110 when the switch 101 of the second (n = 2) sensor system 100 is turned on. Compare. Next, the switch position specification processing unit 211 sets the peak value and the threshold value of the magnetic field detection values of all the magnetic field sensor devices 110 when the switch 101 of the third (n = 3) sensor system 100 is turned on. Compare. Such processing is sequentially performed. Here, the threshold is a value set in advance. For example, the threshold is set experimentally, empirically or theoretically.

  As the process of the subsequent step S9, the switch position specification processing unit 211 performs an average value calculation process. Specifically, when the switch position identification processing unit 211 turns on the switch 101 in the process of step S3, the switch position specifying processing unit 211 uses the magnetic field detection values of all the magnetic field sensor devices 110 stored in the storage unit 203 in the process of step S5. Calculate the average of the peak values. That is, for example, the switch position specifying processing unit 211 calculates the average value of the peak values of the magnetic field detection values of all the magnetic field sensor devices 110 when the switch 101 of the first (n = 1) sensor system 100 is turned on. Do. Next, the switch position specification processing unit 211 calculates the average value of the peak values of the magnetic field detection values of all the magnetic field sensor devices 110 when the switch 101 of the second (n = 2) sensor system 100 is turned on. Do. Next, the switch position specification processing unit 211 calculates the average value of the peak values of the magnetic field detection values of all the magnetic field sensor devices 110 when the switch 101 of the third (n = 3) sensor system 100 is turned on. Do. Such processing is sequentially performed.

  In the subsequent step S10, the switch position specification processing unit 211 specifies the switch 101 at a position desired to be connected to the ground. Specifically, the switch position specifying processing unit 211 determines that the peak values of the magnetic field detection values of all the magnetic field sensor devices 110 become equal to or less than the threshold in the comparison process of step S8, and all the average value calculation processes of step S9. The on switch (the switch 101 turned on in the process of step S3) that minimizes the average value of the peak values of the magnetic field detection values of the magnetic field sensor device 110 is specified as a switch at a position where it is desirable to connect to ground. Thereby, the switch position specification processing unit 211 specifies the switch 101 at a position where noise can be suppressed most.

(Operation, action etc.)
Next, an example of the operation of the magnetic field measurement system 1 and the operation thereof will be described.
Although the application of the magnetic field measurement system 1 is various, in this example, the sensor system 100 is attached to the vehicle body of the design or prototype stage, and the effect of suppressing noise generation is achieved by connecting to the ground in the vehicle body. The application which specifies a certain position is explained.

In this case, first, the plurality of sensor systems 100 are attached to electrical components, cables, and the like of an automobile (for example, an automobile installed in a chassis dynamo or the like) at a design or trial production stage. Then, when the engine of the automobile is driven, the magnetic field measurement system 1 starts the switch position identification process.
In the switch position identification process, the switch position identification processing unit 211 sequentially turns on the switch 101 and then turns off. At this time, the switch position specification processing unit 211 acquires peak values of magnetic field detection values of all the magnetic field sensor devices 110 while the switch 101 is on, and stores the acquired values in the storage unit 203. .

  Thereafter, the switch position specifying processing unit 211 compares the peak value of the magnetic field detection value of all the magnetic field sensor devices 110 stored in the storage unit 203 with the threshold value when the respective switches 101 are turned on by comparison processing. Do. Furthermore, the switch position specifying processing unit 211 calculates the average value of the peak values of the magnetic field detection values of all the magnetic field sensor devices 110 stored in the storage unit 203 when the switch 101 is turned on by the average value calculation process. Do. Then, in the comparison processing, the peak value of the magnetic field detection values of all the magnetic field sensor devices 110 becomes equal to or less than the threshold value in the comparison process, and the magnetic field detection values of all the magnetic field sensor devices 110 in the average value calculation process The on switch (the switch 101 turned on in the process of step S3) that minimizes the average value of the peak values of is identified as the switch to be connected to the ground.

By such switch position identification processing, the magnetic field measurement system 1 specifies a position to be connected to the ground to suppress noise generation.
Then, based on the results obtained in this way, noise generation is suppressed even in an actual vehicle by connecting the specified position in an electrical component, cable, etc. with the actual vehicle (a finished product car) from the beginning to the ground. Will be able to

  This also makes it possible, for example, to solve electromagnetic interference problems that are not predictable in the MBD (Model Based Design) process.

(Effect in the present embodiment)
(1) The magnetic field measurement system 1 can simultaneously detect the magnetic field strength at a plurality of locations of the measurement target by using the plurality of magnetic field sensor devices 110, and at least one switch 101 and a plurality of switches 101 as an entire evaluation of the measurement target. The result of specifying the mounting position of the switch 101 can be obtained.

(2) The magnetic field measurement system 1 operates the plurality of switches 101 by wireless communication, and acquires information of magnetic field strength from the plurality of magnetic field sensor devices 110 by wireless communication, so that the plurality of switches 101 and the plurality of magnetic field sensors The plurality of switches 101 and the plurality of magnetic field sensor devices 110 can be arranged with respect to the measurement object without increasing the degree of freedom without the complexity of connecting the device 110 with a cable and arranging the device 110 with the measurement object.

For example, the plurality of switches 101 and the plurality of magnetic field sensor devices 110 can be disposed inside a complex vehicle at a narrow place.
In addition, if the plurality of switches 101 and the plurality of magnetic field sensor devices 110 are connected by a cable, the cable changes the electromagnetic environment, so the magnetic field sensor device 110 can detect the measurement target with high accuracy. It disappears. On the other hand, in the present embodiment, since the plurality of switches 101 and the plurality of magnetic field sensor devices 110 are not connected by a cable, it is possible to detect the magnetic field strength of each portion to be measured with high accuracy.

(3) The magnetic field measurement system 1 can manage the plurality of switches 101 and the plurality of magnetic field sensor devices 110 as a pair, and can easily manage the plurality of switches 101 and the plurality of magnetic field sensor devices 110.
(4) The magnetic field measurement system 1 can easily change the electrical state of the attachment point by connecting the attachment point of the switch 101 in the object to be measured to the ground.

(5) The magnetic field measurement system 1 can easily specify the switch 101 according to a preset requirement that all peak values of the magnetic field strength become smaller than or equal to a preset value.
(6) The magnetic field measurement system 1 can easily specify the switch 101 according to a preset requirement that the average value of the peak values of the magnetic field strengths is minimized.

  In the embodiment described above, the magnetic field sensor device 110 or the sensor unit 111 constitutes, for example, a detection unit. Also, the switch position specification processing unit 211 configures, for example, a specifying unit. Also, the switch 101 constitutes, for example, variable means.

(Modification of this embodiment, etc.)
As another example of the above embodiment, the magnetic field measurement system 1 can measure the magnetic field strengths of the electrical components, cables, etc., with the measurement target being an aircraft, a railway vehicle, etc., but it is not limited thereto Needless to say. For example, the magnetic field measurement system 1 can also measure the magnetic field strength at a plurality of locations of electrical components, cables, etc., with the electrical components, cables, etc. being parts mounted on aircraft, railway vehicles, etc. as measurement targets. In this case, it goes without saying that the electrical components, cables and the like are not limited to those mounted on aircrafts and railway vehicles.

In addition, as another example of the above-described embodiment, the magnetic field measurement system 1 can finally identify a plurality of switches 101 (a plurality of ground connection positions).
Further, as another example of the above embodiment, the magnetic field sensor device 110 and the switch 101 are not limited to forming a pair (group or group) in a one-to-one relationship, and one magnetic field sensor device 110 and a plurality of switches 101 Can be a pair, a plurality of magnetic field sensor devices 110 and one switch 101 can be a pair, and a plurality of magnetic field sensor devices 110 and a plurality of switches 101 can be a pair.

  In addition, as another example of the above embodiment, the magnetic field sensor device 110 and the switch 101 are not limited to forming a pair, and the magnetic field sensor is not required to have a relationship between the magnetic field sensor device 110 and the switch 101. The device 110 and the switch 101 can also be attached to different positions to be measured.

  Further, as another example of the above embodiment, the switch position specification processing unit 211 does not consider the average value calculation processing, and in the comparison processing, the peak values of the output values of all the magnetic field sensor devices 110 are equal to or less than the threshold value. The magnetic field sensor device 110 corresponding to the on-switch that is to be connected can also be identified as the switch in the position where it is desirable to connect to ground.

  Further, as another example of the embodiment, the switch position specification processing unit 211 can also turn on the plurality of switches 101 in the process of step S3. For example, the plurality of switches 101 are switches of combinations set in advance. As a result, finally, the plurality of switches 101 can also be identified as a switch at a position where it is desirable to connect to the ground.

In addition, as another example of the embodiment, the processing of the processing unit 112 of the magnetic field sensor device 110 can be performed on the processing device 200 side. For example, the processing unit 210 of the processing device 200 performs FFT processing and the like.
In addition, as another example of the above embodiment, the magnetic field measurement system 1 can also connect the processing device 200, the magnetic field sensor device 110, and the switch 101 by a cable.

In addition, as another example of the above-described embodiment, the processing unit 112 can acquire the peak value of the magnetic field intensity other than the above-described method.
Further, as another example of the above-described embodiment, the electrical state can be changed other than the method of turning on and off the switch 101.

  In addition, as another example of the above-described embodiment, the sensor system 100 can integrally include the magnetic field sensor device 110, the switch 101, and the communication unit 102 in the same housing or the like.

  Further, in the above embodiment, an operation control step of operating a plurality of variable means attached at different positions of the object to be measured and capable of changing the electric state of the attached portion, and the variable means respectively in the operation control step Are set in advance based on the respective magnetic field strengths detected by a plurality of detection means which are attached to different positions of the object to be measured when the electric state of the attached portion is changed and the magnetic field of the attached portion is detected. And a specific step of specifying at least one variable means from the plurality of variable means in accordance with the requirements set forth above.

In the above embodiment, the operation control step is attached to different positions of the object to be measured, and the operation control step of operating the plurality of variable means capable of changing the electric state of the attached portion; When each of the variable means operates in the operation control step to change the electric state of the attachment portion, a plurality of detection means are attached to different positions of the object to be measured and a plurality of detection means detect the magnetic field of the attachment portion Identifying at least one variable means from the plurality of variable means according to preset requirements based on each magnetic field strength;
Implements a program that causes a computer to execute In this case, the program is, for example, a program stored in the processing unit 210 of the processing device 200. Also, the switch position specification processing unit 211 configures, for example, an operation control unit.

  Further, in the above embodiment, the sensor system 100 is attached to the object to be measured and operated through wireless communication to change the electrical state of the attached portion, and attached to the object to be measured. A magnetic field measurement apparatus is realized that integrally includes a detection unit that detects a magnetic field of a mounting portion and transmits the detected value by wireless communication.

  Also, while embodiments of the present invention have been disclosed, it will be apparent that modifications can be made by one skilled in the art without departing from the scope of the present invention. All such modifications and equivalents are intended to be included in the following claims.

  Reference Signs List 1 magnetic field measurement system, 100 sensor system, 101 switch, 102 communication unit, 110 magnetic field sensor device, 111 sensor unit, 112 processing unit, 200 processing unit, 210 processing unit, 211 switch position specifying processing unit

In order to solve the above problems, according to a first aspect of the present invention, there are provided a plurality of variable means which are attached to different positions of the object to be measured and can change the electrical condition of the attachment portion A plurality of detection means attached to the position to detect the magnetic field of the attachment portion, and each of the magnetic field intensities detected by the plurality of detection means when the variable means operates to change the electrical state of the attachment portion based, possess a specifying means for specifying at least one variable means, from said plurality of changing means in accordance with predetermined requirements, the variable means, the electrical state by connecting the attachment portion to the ground It is a magnetic field measurement system to change .

In the fourth aspect of the present invention, the plurality of detection means detect magnetic field intensity that fluctuates in time, and the identification means sets in advance all peak values of the magnetic field strength detected by the plurality of detection means. It is preferable to identify the variable means that was operating when the value falls below the specified value.

In the fifth aspect of the present invention, the plurality of detection means detect magnetic field intensity that fluctuates in time, and the identification means determines an average value of peak values of the magnetic field intensities detected by the plurality of detection means. It is preferable to identify the variable means that was operating when it became the smallest.

In order to solve the above problems, a sixth aspect of the present invention is an operation control step of operating a plurality of variable means attached at different positions of the object to be measured and capable of changing the electric state of the attached portion; a plurality of detecting means detecting to detect the magnetic field of the mounting portion mounted on different positions of the measurement object when the respective front Symbol varying means in the operation control step was changed electrical condition of the mounting portion and operation based on each field intensities, have a, a specifying step of specifying at least one variable means from said plurality of changing means in accordance with predetermined requirements, the variable means, that connects the attachment portion to the ground Magnetic field measurement method to change the electrical state .

In order to solve the above problems, according to a seventh aspect of the present invention, the operation control means operates a plurality of variable means which are attached to different positions of the object to be measured and which can change the electrical condition of the attached portion. The operation control step and the identification means are attached to different positions of the object to be measured when the variable means are operated to change the electrical condition of the attachment portion in the operation control step, and the magnetic field of the attachment portion is And causing the computer to execute at a specific step of identifying at least one variable means from the plurality of variable means in accordance with preset requirements based on each magnetic field intensity detected by the plurality of detection means to be detected. is a program to change the electrical state by connecting the attachment portion to the ground.

In order to solve the above-mentioned subject, the 8th mode of the present invention is attached to a measuring object, and it is operated via wireless communications, and the variable means which can change the electrical condition of the attachment part, and the measuring object mounted by detecting the magnetic field of the mounting portion, possess a detecting means for transmitting the detected value by wireless communication, as integral, the variable means, the electrical state by connecting the attachment portion to the ground It is a magnetic field measuring device to change .

According to the first, sixth , and seventh aspects of the present invention, the magnetic field measurement system can simultaneously detect the magnetic field strength at a plurality of points of the measurement object by using a plurality of detection means, It is possible to obtain the result of specifying at least one variable means and the mounting position of the variable means from the variable means of.
Further, according to the first, sixth , and seventh aspects of the present invention, the magnetic field measurement system can easily change the electrical state of the attachment point by connecting the attachment point of the variable means on the measurement object to the ground.

According to the fourth aspect of the present invention, the magnetic field measurement system can easily specify the variable means according to the requirement that all the peak values of the magnetic field strength become less than or equal to the preset value.

According to the fifth aspect of the present invention, the magnetic field measurement system can easily identify the variable means according to the requirement that the average value of the peak values of the magnetic field intensities is minimized.

According to the eighth aspect of the present invention, the detection device operates the variable means by wireless communication, and in order to enable acquisition of information of magnetic field strength from the detection means by wireless communication, the variable means and It is possible to arrange the variable means and the detection means with respect to the object to be measured with a high degree of freedom without the complexity of connecting the detection means with a cable and arranging the object on the object of measurement.
Further, according to the eighth aspect of the present invention, the detection device can easily change the electrical state of the attachment point by connecting the attachment point of the variable means in the measurement object to the ground.

Claims (9)

A plurality of variable means mounted at different positions of the object to be measured and capable of changing the electrical condition of the mounting portion;
A plurality of detection means mounted at different positions of the object to be measured to detect the magnetic field of the mounting portion;
Each of the variable means operates to change the electric state of the attachment portion, and based on the magnetic field strengths detected by the plurality of detection means, at least one variable from the plurality of variable means in accordance with preset requirements Specifying means for specifying means;
A magnetic field measurement system having The plurality of variable means are controlled in operation via wireless communication,
The magnetic field measurement system according to claim 1, wherein the plurality of detection means provide information of the detected magnetic field strength to the identification means by wireless communication.   The magnetic field measurement system according to claim 1 or 2, wherein each of the plurality of detection means and each of the plurality of variable means are associated to form a pair, and each pair is attached to a different position of the object to be measured.   The magnetic field measurement system according to any one of claims 1 to 3, wherein the variable means changes an electrical state by connecting the attachment portion to a ground. The plurality of detection means detect a temporally varying magnetic field strength,
5. The variable means according to claim 1, wherein the specifying means specifies the variable means operating when all of the peak values of the magnetic field strength detected by the plurality of detecting means become equal to or less than a preset value. The magnetic field measurement system according to item 1. The plurality of detection means detect a temporally varying magnetic field strength,
The specifying means specifies the variable means which was operating when the average value of the peak values of the magnetic field strengths detected by the plurality of detecting means becomes the smallest. Magnetic field measurement system as described. An operation control step of operating a plurality of variable means attached at different positions of the object to be measured and capable of changing the electrical condition of the attachment portion;
When each of the variable means operates in the operation control step to change the electric state of the attachment portion, a plurality of detection means are attached to different positions of the object to be measured and a plurality of detection means detect the magnetic field of the attachment portion Identifying at least one variable means from the plurality of variable means according to preset requirements based on each magnetic field strength;
A method of measuring a magnetic field. An operation control step of operating a plurality of variable means which are attached to different positions of the object to be measured and which are capable of changing the electrical condition of the attached portion;
When each of the variable means operates in the operation control step to change the electrical condition of the attached portion in the operation control step, a plurality of detections are attached to different positions of the measurement object to detect the magnetic field of the attached portion Identifying at least one variable means from the plurality of variable means according to preset requirements based on each magnetic field intensity detected by the means;
A program that causes a computer to execute. A variable means attached to the object to be measured and operated via wireless communication to change the electrical condition of the attached portion;
A detection means attached to the object to be measured to detect the magnetic field of the attachment portion, and transmitting the detected value by wireless communication;
A magnetic field measurement device having an integral unit.

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