JP4887496B2 - Magnetic field distribution measuring device - Google Patents

Description

  The present invention belongs to a technical field related to a magnetic field distribution measuring apparatus that detects a magnetic field distribution in a three-dimensional space.

  In recent years, electromagnetic fields in any space can be measured using a wide variety of sensors, such as those using coils, Hall elements, or magnetoresistive elements, depending on the purpose, such as the strength of the magnetic field to be measured, whether AC or DC, and the measurement environment. 2. Description of the Related Art A magnetic field distribution measuring device that measures a field distribution is known.

  These magnetic field distribution measuring apparatuses are used not only for pure magnetic field measurement but also in various engineering fields including electric / electronic systems such as current sensors, magnetic heads, moving object detectors, and the like.

When measuring the electromagnetic field distribution in a predetermined three-dimensional space, these magnetic field distribution measuring apparatuses acquire a value for each predetermined “point” (hereinafter referred to as “measurement point”). The measured magnetic field distribution is calculated by summing up the values of the measured points (hereinafter referred to as “measured values”).
In Patent Document 1, it is possible to arbitrarily move within a test field, and a main sensor (12) for detecting a test quantity, a position where the test field can be photographed, are fixed, and the main sensor (12 ) For detecting coordinates in a plane perpendicular to the optical axis (AX), and coordinate detection in the direction of the optical axis of the main sensor toward the test field, fixed to the video camera. In a field measurement system including a transmitter (13c) for transmitting a measurement wave for use, the wave source of the transmitter (13c) is set on the optical axis (AX) of the video camera (13). A measurement system is described. According to this, it is said that the calculation amount related to the calculation of the distribution of the test amount can be suppressed while adopting the free scanning sensor system.
Non-Patent Document 1 describes a method in which a magnetic moment having a magnetic field distribution equivalent to a measurement magnetic field around an electric device is obtained numerically and used as an equivalent magnetic field source model.
JP 2005-265480 A Shinichiro Nishizawa et al., IEICE Transactions B, July 2003, Vol. J86-B, no. 7, p. 1251-1254 (2003).

  However, in these magnetic field distribution measurement devices, it is necessary to obtain the measurement points and measurement values in association with each other. However, in order to associate them, the measurement person manually or a large-scale device The current situation is that there is only an automated method.

  The present invention has been made to solve the above-mentioned problems, and its object is to easily and surely measure the magnetic field distribution in a three-dimensional space with a simple configuration that reliably associates measurement points with measurement values. An object of the present invention is to provide a magnetic field distribution measuring apparatus capable of performing the above.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a magnetic field distribution measuring apparatus for measuring a magnetic field distribution in an arbitrary three-dimensional space, and a first sensor for detecting a position and an inclination in the three-dimensional space. A second sensor that detects a magnetic force for each point in the three-dimensional space, a holding member that holds the first sensor and the second sensor separated by a predetermined distance, and the second sensor Each time the magnetic force in the three-dimensional space is detected, the position of the second sensor is calculated based on the position and inclination acquired by the first sensor at the detection timing and the distance between the first sensor and the second sensor. And an arithmetic means for performing the operation.

  With this configuration, the invention according to claim 1 makes it possible to detect the position and inclination acquired by the first sensor at the detection timing, the first sensor, and the first sensor each time the second sensor detects the magnetic force in the three-dimensional space. Since the position of the second sensor can be calculated based on the distance between the two sensors, the position of the second sensor in the three-dimensional space can be accurately recognized.

  Therefore, according to the first aspect of the present invention, by associating the magnetic force detected by the second sensor with the position of the second sensor recognized at that time in the three-dimensional space, even if the holding member is appropriate in the three-dimensional space. Even if it is moved to, the magnetic field distribution on the movement path in the three-dimensional space can be accurately measured, so that the magnetic field distribution in the three-dimensional space can be easily and reliably measured with a simple configuration.

  According to a second aspect of the present invention, there is provided the magnetic field distribution measuring apparatus according to the first aspect, wherein the computing means is configured to use the first sensor and the second sensor based on the position and inclination of the first sensor acquired in advance. Is calculated, and the position of the second sensor is calculated using the calculated distance.

  With this configuration, the invention according to claim 2 can calculate the distance between the first sensor and the second sensor by detecting the position of the first sensor in the three-dimensional space and the inclination thereof. The position of the sensor in the three-dimensional space can be accurately recognized.

  Therefore, according to the second aspect of the present invention, by associating the magnetic force detected by the second sensor with the position of the second sensor recognized at that time in the three-dimensional space, even if the holding member is appropriate in the three-dimensional space. Even if it is moved to, the magnetic field distribution on the movement path in the three-dimensional space can be accurately measured, so that the magnetic field distribution in the three-dimensional space can be easily and reliably measured with a simple configuration.

  The invention according to claim 3 is the magnetic field distribution measuring apparatus according to claim 1 or 2, further comprising magnetic field generating means for detecting the position and inclination of the first sensor, wherein the first sensor is The position and inclination of the first sensor in the three-dimensional space are detected based on the magnetic force generated from the magnetic field generating means.

  With this configuration, the invention according to claim 3 can accurately detect the position and inclination of the first sensor by using the magnetic field, and therefore can accurately detect the position of the second sensor.

  According to a fourth aspect of the present invention, in the magnetic field distribution measurement apparatus according to any one of the first to third aspects, the holding member is a member having a predetermined length, and the first sensor is provided at one end. Is provided, and the second sensor is provided at the other end.

  With this configuration, the invention according to claim 4 can hold the first sensor and the second sensor at one end and the other end by a member having a predetermined length such as a rod shape or a plate shape. Separates the magnetic field used for position detection from the magnetic field in the three-dimensional space measured by the second sensor, can suppress mutual interference, and can also take into account the shape held by the measurer. The operability can also be improved.

  Even if the holding member is appropriately moved in the three-dimensional space by associating the magnetic force detected by the second sensor with the position of the second sensor recognized at that time in the three-dimensional space, Since the magnetic field distribution on the moving path in the three-dimensional space can be accurately measured, the magnetic field distribution in the three-dimensional space can be easily and reliably measured with a simple configuration.

  Next, preferred embodiments of the present invention will be described with reference to the drawings. In addition, this invention includes the range which has the technical feature, and is not limited to drawing shown below.

  The embodiment described below is a magnetic field distribution measuring apparatus using a sensor rod (probe) composed of a magnetic field sensor for measuring magnetic force in an arbitrary three-dimensional space and a magnetic position sensor (motion capture). In the embodiment, the present invention is applied.

  First, the outline of the magnetic field distribution measuring apparatus of the present embodiment will be described with reference to FIG. FIG. 1 is a block diagram showing the configuration of the magnetic field distribution measuring apparatus of this embodiment.

  As shown in FIG. 1, the magnetic field distribution measuring apparatus 100 according to the present embodiment adds a position sensor 110 to a magnetic field sensor 140 for measuring the magnetic force at each point in an arbitrary three-dimensional space S. It has a sensor rod (bar-shaped member) in which the position of the position sensor 110 is always fixed, and measures each measurement point (point) and stores the measured value and the position of the measurement point in association with each other. The measurement result is output.

  Therefore, the magnetic field distribution measuring apparatus 100 can accurately recognize the position of the magnetic field sensor 140 in the three-dimensional space S. Therefore, the magnetic force detected by the magnetic field sensor and the three-dimensional space S of the magnetic field sensor recognized at that time are detected. The upper position can be stored in association with each other.

  Therefore, the magnetic field distribution measuring apparatus 100 can accurately measure the magnetic field distribution on the moving path in the three-dimensional space S even if the sensor rod is appropriately moved in the three-dimensional space S. The magnetic field distribution in the three-dimensional space S can be easily and reliably measured with a simple configuration.

  Next, the configuration of the magnetic field distribution measuring apparatus 100 of the present embodiment and the schematic operation of each part constituting the magnetic field distribution measuring apparatus 100 will be described with reference to FIGS.

  FIG. 2 is a diagram for explaining the magnetic field generated from the magnetic field generation unit 120 and the position and angle detected by the position sensor 110 in the present embodiment. FIG. It is a figure for demonstrating calculation of distance. FIG. 4 is an example of a visualization process based on magnetic field data and coordinate data in the present embodiment.

  As shown in FIG. 1, the magnetic field distribution measuring apparatus 100 of the present embodiment includes a position sensor 110 that detects a position in the three-dimensional space S, and a magnetic field generation unit that generates a magnetic field used when detecting a position in the position sensor 110. 120, a sensor control unit 130 that controls the position sensor 110 and the magnetic field generation unit 120, a magnetic field sensor 140 that detects the magnetic force of each point in the three-dimensional space S, and a sensor rod 150 that holds the position sensor 110 and the magnetic field sensor 140 ( A rod-shaped member).

  In addition, the magnetic field distribution measuring apparatus 100 calculates the distance between the position sensor 110 and the magnetic field sensor 140 (hereinafter referred to as “inter-sensor distance”) and calculates the position at the time of magnetic force measurement at each measurement point by the magnetic field sensor 140. An arithmetic processing unit 160, a system control unit 170 that controls each unit, a data storage unit 180 that stores predetermined data, and a process for visualizing the magnetic field distribution of the three-dimensional space S based on the measured data of each measurement point An output processing unit 190 for performing

  For example, the position sensor 110 of the present embodiment constitutes a first sensor of the present invention, and the magnetic field generator 120 constitutes a magnetic field generating means of the present invention. For example, the magnetic field sensor 140 of this embodiment comprises a 2nd sensor, and the rod-shaped member 150 comprises the holding member of this invention.

  The position sensor 110 is composed of a non-contact type magnetic sensor. The position sensor 110 detects a magnetic field generated from the magnetic field generator 120 and detects a relative position of the position sensor 110 from the magnetic field generator 120 and an angle of the position sensor 110. The detected position and angle are output to the arithmetic processing unit 160 via the sensor control unit 130 as position information and angle information.

  Specifically, as shown in FIG. 2, the position sensor 110 of the present embodiment is based on the magnetic field (Hx, Hy, Hz) generated from the magnetic field generator 120, and the magnetic field generator 120 of the position sensor 110. The relative position (x, y, z) from the left and right angles (azimuth) yaw, the vertical angle (everation) pitch, and the rotation angle (roll) roll of the position sensor 110 are detected. Yes.

  The magnetic field generation unit 120 generates a predetermined magnetic field as a reference for the position sensor 110 based on the control of the sensor control unit 130. Specifically, the magnetic field generation unit 120 of the present embodiment transmits a magnetic field (electromagnetic field) serving as a reference for the position sensor 110 based on the frequency output from the sensor control unit 130.

  The sensor control unit 130 supplies power to the magnetic field generation unit 120 and the position sensor 110, controls the magnetic field generated by the magnetic field generation unit 120, analyzes position information and angle information detected by the position sensor 110, and Control of output of information and angle information to the arithmetic processing unit 160 is performed.

  The magnetic field sensor 140 includes a sensor and a main body, and outputs data of each measurement point acquired by the sensor (hereinafter referred to as “magnetic field data”) to the main body. The unit analyzes the acquired magnetic field data and outputs the data to the data storage unit 180 as numerical data.

  The magnetic field data specifically indicates the magnitude (absolute value of the magnetic field vector) information, phase information, information on each component of the magnetic field vector, frequency information, and the like obtained by a triaxial isotropic magnetic field sensor or the like. .

  The sensor rod 150 has a predetermined length and thickness, and is configured in a portable shape. In addition, the rod-shaped member 150 is provided with a position sensor 110 at one end and a magnetic field sensor 140 at the other end.

  In the present embodiment, a non-contact type magnetic field sensor is used as the position sensor 110, but mutual magnetic fields generated in the position sensor 110 and the magnetic field sensor 140 due to the sensor rod 150 having a predetermined length. To prevent interference. Further, in the present embodiment, since interference between the magnetic field generated in the position sensor 110 and the magnetic field sensor 140 is prevented, the influence of the magnetic field sensor 140 on the position sensor 110 can be eliminated.

  Position information and angle information of the position sensor 110 output from the sensor control unit 130 are input to the arithmetic processing unit 160. The arithmetic processing unit 160 is controlled by the system control unit 170 before measuring the magnetic field distribution in the three-dimensional space S based on the position information and the angle information acquired in advance. The distance is calculated.

  Specifically, as shown in FIG. 3, the arithmetic processing unit 160 according to the present embodiment acquires position information and angle information at measurement points (two points) in the three-dimensional space S that are input in advance, and each measurement is performed. The angle θ of the rod-shaped member 150 at the point and the distance ΔZ between the position sensor 110 and the magnetic field sensor 140 in the height direction (Z direction) are calculated. The arithmetic processing unit 160 calculates the inter-sensor distance R by (Equation 1) based on the calculated angle θ and distance ΔZ of each measurement point.

  That is, when the bar-shaped member 150 is tilted (when tilted with respect to the horizontal plane in the three-dimensional space S), the arithmetic processing unit 160 measures the measurement points acquired by the position sensor 110 at that time. Since the angle θ and the distance ΔZ can be calculated from the position information and the angle information, the inter-sensor distance R can be calculated based on the angle θ and the distance ΔZ at any two points in (Expression 1). It is like that.

  In the present embodiment, when the distance between the sensors is calculated, the position sensor 110 is measured in a state where the rod-shaped member 150 is inclined in the three-dimensional space S. Further, in the present embodiment, by causing the arithmetic processing unit 160 to calculate the angle θ and the distance Δz at two or more (preferably 200 or more) measurement points, and to calculate the average by (Expression 2), An accurate inter-sensor distance may be calculated.

  On the other hand, in the magnetic field distribution measurement, the arithmetic processing unit 160 according to the present embodiment inputs the distance between the sensors and the timing at which the magnetic field sensor 140 acquires the magnetic field data at each measurement point in the three-dimensional space S. Based on the position information and each information, the coordinates in the three-dimensional space S of the magnetic field sensor 140 are calculated, and the calculated coordinates of each measurement point are output to the data storage unit 180 as coordinate data.

  Specifically, the arithmetic processing unit 160 of the present embodiment is based on the position information (x, y, z) and angle information (yaw, pitch, roll) output from the position sensor 110 for each point (formula In 3), the distances (Δx, Δy, Δz) between the position sensor 110 and the magnetic field sensor 140 on the three-dimensional space S in the three-dimensional space S are calculated, and the calculated x-axis, y-axis are calculated. Based on the distance (Δx, Δy, Δz) between the sensors on the z-axis, the position of the magnetic field sensor 140, that is, the coordinates of the measurement point for measuring the magnetic force is calculated by (Expression 4).

  The system control unit 170 is mainly composed of a central processing unit (CPU), ROM, RAM, and hard disk, and is connected to each unit by a bus B, and generalizes the overall functions of the magnetic field distribution measuring apparatus 100. It comes to control.

  Specifically, various control information for controlling each part of the magnetic field distribution measuring apparatus 100 is recorded on the ROM, and various programs such as a control program and an OS (Operating System) are recorded on the hard disk. Yes.

  The CPU executes a program recorded on the hard disk, thereby calculating the distance between the sensors before measuring the magnetic field distribution in the three-dimensional space S, and calculating the magnetic field data and coordinate data when measuring the magnetic field distribution in the three-dimensional space S. In addition, various controls of the storage process and the magnetic field data output process (a visualization process described later) are performed. The RAM is used as a work area.

  The data storage unit 180 includes a storage device such as a RAM or a hard disk. In particular, the data storage unit 180 of the present embodiment stores magnetic field data output from the magnetic field sensor 140 in association with coordinate data under the control of the system control unit 170. The data storage unit 180 outputs magnetic field data and coordinate data to the output processing unit 190 based on the control of the system control unit 170.

  The output processing unit 190 performs visualization processing of the magnetic field distribution in the three-dimensional space S based on the magnetic field data and coordinate data read from the data storage unit 180 under the control of the system control unit 170. The data for printing on the printing means such as, or for displaying on the display means such as a display is output.

  For example, the output processing unit 190 according to the present embodiment performs data processing for printing and display as shown in FIG. 4 based on the magnetic field data and coordinate data read from the data storage unit 180.

  FIG. 4 is a diagram showing the magnetic field distribution in the three-dimensional space S around the IH (Induction Heater) cooker (electromagnetic induction heating cooker), where the magnetic force is measured at intervals of 5 cm on both the X axis and the Y axis. Show. 4A shows the magnetic field distribution (Z = 0) in the three-dimensional space S in front of the IH cooker, and FIG. 4B shows the magnetic field distribution (Z = variable) in the three-dimensional space S including the IH cooker. ).

  Note that the field strength on the vertical axis in FIG. 4 is the magnitude of the magnetic field (absolute value of the magnetic flux density vector) at each measurement point.

  As described above, the magnetic field distribution measuring apparatus 100 according to the present embodiment can calculate the distance between the position sensor 110 and the magnetic field sensor 140 by detecting the position of the position sensor 110 in the three-dimensional space S and the inclination thereof. The position of the sensor 140 on the three-dimensional space S can be recognized.

  For this reason, the magnetic field distribution measuring apparatus 100 can associate the magnetic force detected by the magnetic field sensor 140 with the position of the magnetic field sensor 140 recognized at that time in the three-dimensional space S. Even if it is moved appropriately in S, the magnetic field distribution in the three-dimensional space S can be accurately measured.

  Therefore, the magnetic field distribution measuring apparatus 100 can easily and surely measure the magnetic field distribution in the three-dimensional space S with a simple configuration.

  In this embodiment, a non-contact magnetic sensor is used as the position sensor 110. Of course, as long as the position and inclination of the position sensor 110 in the three-dimensional space S can be detected, other methods and types are available. A sensor may be used.

It is a block diagram which shows the structure of one Embodiment of the magnetic field distribution measuring apparatus which concerns on this application. In one Embodiment, it is a figure for demonstrating the position and angle which are detected with the magnetic field and position sensor which are generated from a magnetic field generation part. It is a figure for demonstrating calculation of the distance between sensors in one Embodiment. It is an example of the visualization process based on the magnetic field data and coordinate data in one Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Magnetic field distribution measuring apparatus 110 ... Position sensor 120 ... Magnetic field generation part 130 ... Sensor control part 140 ... Magnetic field sensor 150 ... Bar-shaped member 160 ... Arithmetic processing part 170 ... System control part 180 ... Data storage part 190 ... Output processing part

Claims (3)

A magnetic field distribution measuring device for measuring a magnetic field distribution in an arbitrary three-dimensional space,
A first sensor for detecting a position and inclination in the three-dimensional space;
A second sensor for detecting a magnetic force for each point in the three-dimensional space;
A holding member in which the first sensor and the second sensor are held at a predetermined distance;
Each time the magnetic force in the three-dimensional space is detected by the second sensor, based on the position and inclination acquired by the first sensor at the detection timing and the distance between the first sensor and the second sensor. Computing means for computing the position of the second sensor;
Equipped with a,
The calculation means calculates a distance between the first sensor and the second sensor based on the position and inclination of the first sensor acquired in advance, and calculates the position of the second sensor using the calculated distance. Magnetic field distribution measuring device characterized by the above. In the magnetic field distribution measuring apparatus according to claim 1 ,
Magnetic field generating means for detecting the position and inclination of the first sensor;
The magnetic field distribution measuring apparatus, wherein the first sensor detects a position and an inclination of the first sensor in the three-dimensional space based on a magnetic force generated from the magnetic field generating unit. In the magnetic field distribution measuring apparatus according to claim 1 or 2 ,
The magnetic field distribution measuring apparatus, wherein the holding member is a member having a predetermined length, the first sensor is provided at one end and the second sensor is provided at the other end.

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