JP2013228210A - Electromagnetic wave data management system, method and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute measurement of electromagnetic wave intensity in space without using a probe array.SOLUTION: An electromagnetic wave data management system comprises: input means 64 for inputting measurement data of an electromagnetic wave received by a unique probe 10; input means 61 for inputting position data in space of a marker 50 incidental to the probe 10; control means 62 for calculating a position of the probe 10 on the basis of the position data input by the input means 61; and a PC 70 for storing the measurement data associated with the position data.

Description

  The present invention relates to an electromagnetic wave data management system, method, and program, and more particularly, to an electromagnetic wave data management system, method, and program for managing electromagnetic wave measurement data received by a probe and position data indicating the measurement position.

  Patent Document 1 discloses an electromagnetic wave measuring apparatus that can visually recognize the measurement position of a measurement object and easily measure the electromagnetic wave intensity distribution at the visually recognized place in a short time. The electromagnetic wave measuring apparatus includes a probe array including a plurality of probe probes that detect an electromagnetic wave intensity distribution of a measurement object, a camera that images the measurement object, and a camera fixing member that fixes the probe array to a focal position of the camera. The probe array has a conical (viewing angle) bottom surface with the principal point of the camera as a vertex, and a focal plane, and the position of the measurement object can be visually recognized from a plurality of the probe probes from the image signal of the camera. The probe array is fixedly disposed in the field of view of the camera by being arranged at predetermined intervals, and the frequency intensity distribution of the measurement object and the position of the image can be measured in association with each other.

JP 2009-276092 A

  However, since the electromagnetic wave measuring device disclosed in Patent Document 1 uses a probe array, radio waves passing through the probes and wiring connected to them inevitably interfere with the measurement results of other probes. Therefore, it is difficult to obtain a correct electromagnetic wave intensity distribution.

  Further, when using a probe array, it is impossible to measure electromagnetic waves in a gap that is physically smaller than that of the probe array, and the objects to be measured are limited. Furthermore, although related to this, when a measurement object is imaged with a camera, it is usually difficult to distinguish the measurement results in the depth direction of the measurement object because the image from the camera can only be displayed on the display plane. is there.

  Accordingly, an object of the present invention is to make it possible to perform electromagnetic wave measurement in a three-dimensional space without using a probe array in order to solve the above inconvenience.

In order to solve the above problems, the electromagnetic wave data management system of the present invention is:
First input means (for example, input means 64 in FIG. 1) for inputting electromagnetic wave measurement data received by a single probe (for example, probe 10 in FIG. 1);
A second input means (for example, means realized by the input means 61 and the control means 62 in FIG. 1) for inputting position data in a space output from a position sensor that detects the position of the probe;
A storage unit (for example, PC 70 in FIG. 1) that associates and stores the measurement data and the probe position data input by the second input unit when the measurement data is input by the first input unit; It is a system equipped.

Further, the electromagnetic wave data management method of the present invention includes:
A step of inputting measurement data of electromagnetic waves received by a single probe;
Inputting three-dimensional position data output from a position sensor for detecting the position of the probe;
Storing the measurement data and the position data in association with each other.

  Furthermore, the electromagnetic wave data management program of the present invention is a program for causing a computer to execute the above steps.

  According to the present invention, when the electromagnetic wave is measured with a single probe, the position of the probe is detected and the measurement data and the position data are linked. It is also possible to display the intensity distribution.

It is a typical block diagram of the electromagnetic wave data management system of embodiment of this invention. It is a typical internal block diagram of the electromagnetic field sensor 100 which is the probe 10 shown in FIG. It is explanatory drawing of the electrical connection of the electromagnetic field sensor 100 shown in FIG. It is an explanatory view of a coil X ₁ shown in FIG. It is a figure which shows the example of arrangement | positioning of the coil group shown in FIG.

DESCRIPTION OF SYMBOLS 10 Probe 20 Spectrum analyzer 30 Imaging means 40 Switch with LED lamp 50 Marker 60 Control unit 70 Personal computer (PC)
80 display

BEST MODE FOR CARRYING OUT THE INVENTION

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First, one advantage of the electromagnetic wave data management system of this embodiment will be described. On June 18, 2007, the World Health Organization task group issued an environmental health criterion on health risks from exposure to low and very low frequency (up to 400 kHz) electric and magnetic fields.

  Even in our daily lives, electromagnetic cookers (IH cookers), vacuum cleaners, home TVs, personal computers, home appliances in general, digital home appliances in general, information equipment, lighting equipment, and electric vehicles that are expected to become popular in the future are also low. It has a source of frequency magnetic field.

  In order to avoid health risks from exposure to human bodies with low-frequency magnetic fields, it is necessary to take electromagnetic shielding measures. To that end, from any position in a low-frequency magnetic field source such as an electromagnetic cooker, It is necessary to specify how much low frequency magnetic field is generated.

  The electromagnetic wave data management system of the present embodiment is capable of such identification, and in particular, when the one shown in FIG. 2 is used, it is possible to measure the electromagnetic field strength in the three-axis directions of the XYZ axes. This is very useful for taking electromagnetic shielding measures.

(Description of configuration)
FIG. 1 is a schematic configuration diagram of an electromagnetic wave data management system according to an embodiment of the present invention. In FIG. 1, a probe 10, a spectrum analyzer 20, an imaging means 30, an LED lamp-equipped switch 40, a marker 50, a control unit 60, and a personal computer (hereinafter referred to as “PC”) are described below. ) 70 and a display 80.

  The probe 10 receives electromagnetic waves and is synonymous with a so-called antenna. In the electromagnetic wave data management system of this embodiment, the only probe 10 is used. As the probe 10, one having directivity may be used, or one having no directivity may be used.

  For example, the electromagnetic wave measuring device “ELT-400” manufactured by NARDA, the magnetic field measuring device “FT3470-52” manufactured by Hioki Electric Co., Ltd., or an electromagnetic field sensor 100 described later (FIG. 2) is used. Can do.

  The spectrum analyzer 20 is connected between the probe 10 and the control unit 60. Data communication is performed between the spectrum analyzer 20 and the control unit 60 based on, for example, RS232C, GPIB (General Purpose Interface Bus), LAN (Local Area Network), and USB (Universal Serial Bus) standards.

  The spectrum analyzer 20 receives an output signal based on the electromagnetic wave received by the probe 10, measures the intensity of the electromagnetic wave in a preset frequency bandwidth of the measurement range, and outputs measurement data to the control unit 60. . In addition, when the measurement is completed, the control unit 60 is notified accordingly.

  The imaging means 30 includes a still camera or a video camera that captures an object to be measured and a camera that captures the marker 50. In the electromagnetic wave data management system of the present embodiment, the video camera may be selectively provided, but it is essential to have a marker photographing camera. The marker photographing camera can be a so-called infrared video camera. The imaging unit 30 is connected to the control unit 60 by USB and secures a DC power source from the control unit 60. In order to avoid noise from being superimposed on the output from the imaging means 30, optical communication or the like may be employed instead of the USB connection.

  The switch with LED lamp 40 is connected to the control unit 60 through a digital I / O terminal. The LED lamp-equipped switch 40 is a switch for instructing the control unit 60 to pick up infrared imaging data (position data) of the marker 50 output from the imaging means 30.

  The LED lamp-equipped switch 40 includes an LED lamp that is turned on when the intensity of the electromagnetic wave in the frequency bandwidth of the measurement range set in advance in the spectrum analyzer 20 at that position is measured after the switch is pressed.

  In the present embodiment, since the above-mentioned notification is output from the spectrum analyzer 20 to the control unit 60 upon completion of the measurement of the electromagnetic wave, the control unit 60 determines the LED to the switch with LED lamp 40 based on this notification. Send instructions for lighting the lamp.

  The LED lamp portion and the switch portion may be provided separately, and a speaker and a vibration function are provided in place of the LED lamp, and the measurement of electromagnetic waves is completed for the operator of the probe 10 through the other five senses other than vision. May be notified.

  It should be noted that it is not essential to provide the LED lamp-equipped switch 40. For example, if the spectrum analyzer 20 has a very high specification, the measurement time can be shortened. Therefore, the operator of the probe 10 moves the electromagnetic wave intensity in space by moving the probe 10 at a speed of about 10 cm to 20 cm per second, for example. It is possible to scan continuously.

  The marker 50 is imaged by the imaging means 30. In the present embodiment, since an infrared video camera is used as an imaging camera for the marker 50 in the imaging means 30, the marker 50 may be made of a material that absorbs or reflects infrared rays, such as plastic. The size of the marker 50 is not particularly limited, but may be, for example, about the size of a ping-pong ball.

  In the present embodiment, the marker 50 needs to be fixedly attached to the probe 10. Therefore, the probe 10 and the spectrum analyzer 20 must not be attached to a flexible wiring or the like, but must be attached to a rigid body such as an attachment portion (not shown) of the probe 10.

  Thereby, if the marker 50 fixedly attached to the predetermined position from the probe 10 is imaged by the imaging means 30, and the distance between the probe 10 and the marker 50 is offset from the imaging data, the position data of the probe 10 can be acquired. .

  When the probe 10 is a directional type, at least three markers 50 are preferably attached. This is because, by imaging all the markers 50, it becomes possible to perform highly accurate measurement with six degrees of freedom in space.

  The control unit 60 inputs input means 61 for inputting infrared imaging data of the marker 50 for detecting the position of the probe 10 and visible light imaging data of the measurement target, measurement data output from the spectrum analyzer 60, and the like. A communication means 65 for performing communication between the input means 64 and the LED lamp-equipped switch 40, an output means 63 for outputting measurement data input by the input means 64 to the PC 70, and various processing operations described below. And control means 62 for controlling.

That is, the control means 62 mainly
When the signal indicating that the LED lamp-equipped switch 40 is pressed by the communication unit 65 is input, the position data of the marker 50 output from the imaging unit 30 is picked up.
Calculating the position data of the probe 10 by subtracting the offset amount between the marker 50 and the probe 10 from the infrared imaging data of the marker 50 input by the input means 61;
Outputting the calculated position data and the measurement data input by the input means 64 to the PC 70 through the output means 63;
An instruction to turn on the LED lamp of the switch with LED lamp 40 is output through the communication means 65 when a notification of the completion of the measurement of the electromagnetic wave intensity from the spectrum analyzer 20 is input by the input means 64;
Each process is executed.

  The PC 70 records each data output from the control unit 60 on a recording medium (not shown), or performs predetermined image processing based on each data to create image data and output it to the display 80. is there.

  The display 80 is connected to the PC 70 and serves as a display medium on which image data output from the PC 70 is displayed.

  According to the above configuration, when the entire system is viewed, it is possible to associate and save the electromagnetic wave measurement data received by the probe 10 and the position data in the space of the probe 10 at the time of the measurement.

  However, the configuration shown in FIG. 1 is an example, and it is not essential to use the imaging means 10 and the marker 50, for example. Instead of these, it is also possible to detect the position of the probe 10 using GPS or the like. Therefore, the position data itself of the probe 10 may be input to the control unit 60.

(Description of operation)
Next, the operation of the electromagnetic wave data management system of the present embodiment will be described together with the method of using the electromagnetic wave data management system.

  First, the operator of the probe 10 sets a frequency bandwidth to be a measurement range in the spectrum analyzer 20. Subsequently, the probe 10 held in a state where the electromagnetic wave data management system is driven is positioned at a place where the electromagnetic wave data is to be measured. Then, when the operator of the probe 10 presses the switch 40 with LED lamp, a notification that the switch 40 has been pressed is input to the control unit 60 through the communication means 65.

  In the control unit 60, when this notification is input, the control unit 62 picks up the position data of the marker 50 output from the imaging unit 30. In other words, the infrared imaging data is fixed at the timing when the operator of the probe 10 almost presses the switch 40 with the LED lamp.

  Here, the spectrum analyzer 20 differs in the measurement time of the intensity of the electromagnetic wave according to the setting contents of the frequency bandwidth that becomes the measurement range. This is because the measurement time depends on the frequency bandwidth and the specifications of the spectrum analyzer 20 itself.

  Then, when it is desired to measure the intensity of the electromagnetic wave at a certain position, if the probe 10 is moved before the measurement in the full width of the predetermined frequency band is completed, the moved electromagnetic wave is sensed. Therefore, it is impossible to measure the intensity of the electromagnetic wave in the full width of the frequency band at the position to be measured.

  Therefore, in this embodiment, in order to prompt the electromagnetic wave measurer, that is, the operator of the probe 10 not to move the probe 10, the operator of the probe 10 presses the switch 40 with the LED lamp, The probe 10 is not moved until the LED lamp of the switch 40 with LED lamp is lit.

  In other words, the time from when the operator of the probe 10 presses the LED lamp-equipped switch 40 to when the LED lamp of the LED lamp-equipped switch 40 is turned on is determined according to the setting contents for the spectrum analyzer 20 or the like.

  In a strict sense, the position of the probe 10 changes due to camera shake of the operator of the probe 10, but if the operator does not intentionally move the probe 10, the camera shake is regarded as a measurement error. Good.

  Further, the control unit 62 calculates the position data of the probe 10 based on the infrared imaging data of the marker 50 input by the input unit 61 and the above-described offset amount. Thereafter, when the notification of the completion of the measurement of the electromagnetic wave intensity from the spectrum analyzer 20 is input through the input unit 64, the control unit 62 outputs an instruction to turn on the LED lamp of the switch with LED lamp 40 through the communication unit 65.

  As a result, the operator of the probe 10 may move the probe 10 and press the LED lamp-equipped switch 40 again at the next measurement position.

  On the other hand, the control unit 60 outputs the calculated position data to the PC 70 through the output unit 63 in a state where the calculated position data and the measurement data input by the input unit 64 are linked.

  In the PC 70, each data output from the control unit 60 is recorded on a recording medium (not shown), or predetermined image processing is performed based on each data to create image data in which measurement data and position data are integrated. . The PC 70 can also display this image data by outputting it to the display 80.

  In the present embodiment, an example in which the main operation is realized in the control unit 60 has been described. However, a part or all of the above-described control unit 60 can be realized by the PC 70 without providing the control unit 60. Is also possible.

  For example, in order to realize the operation of the above-described control unit 60 on the PC 70 without providing the control unit 60, the step of inputting the electromagnetic wave measurement data received by the probe 10 and the marker 50 attached to the probe 10 are performed. A step of inputting position data in a space output from a position sensor for detecting a position, a step of calculating the position of the probe 10 based on the input position data and the offset amount described above, the measurement data and the position A program for causing the PC 70 to execute the step of associating and saving data may be installed in the PC 70.

  FIG. 2 is a schematic internal configuration diagram of the electromagnetic field sensor 100 which is the probe 10 shown in FIG. FIG. 2A shows a plan view of a coil group constituting the electromagnetic field sensor 100, and FIG. 2B shows a side view of the coil group.

  First, an outline of the electromagnetic field sensor 100 will be described. The electromagnetic field sensor 100 can measure the direction and intensity of the electromagnetic field. In particular, in the present embodiment, in order to be able to specify the direction of the electromagnetic field, the XYZ directions in which the respective axes are orthogonal to each other. And a plurality of amplifiers that amplify a voltage based on an electromagnetic field induced by each coil.

  The outer shape of the electromagnetic field sensor 100 is not particularly limited, and may be appropriately selected from a dome shape, a cylindrical shape, a cube, a rectangular parallelepiped, and the like. As an example of the external dimensions of the electromagnetic field sensor 100, the size can be set to fit within φ40 mm × 30 mm, 30 mm × 30 mm × 30 mm, or 20 mm × 30 mm × 40 mm based on the coil size described later.

  Of course, depending on the electromagnetic field measurement target, it may not be necessary to reduce the size to this size. Therefore, the coil size is determined according to the size of the measurement target, and the size of the electromagnetic field sensor 100 itself is selected accordingly. do it. Therefore, the size of the electromagnetic field sensor 100 itself may be, for example, about 1.5 to 3 times the above size.

  In the present embodiment, the amplifier provided in the electromagnetic field sensor 100 preferably has an internal amplifier gain of about 20 dB. Further, the electromagnetic field sensor 100 is preferably configured to cover a frequency band of 10 Hz to 1 GHz. The conditions for this will be described later.

  As shown in FIG. 2, the electromagnetic field sensor 100 includes a spacer 110 provided on a substrate (not shown). The substrate and the spacer 110 should be made of a material that can accurately measure the strength of the electromagnetic field, such as a foam, a resin material, and wood. For example, a polystyrene foam can be used.

  FIG. 2A shows a spacer 110 having a rectangular parallelepiped outer shape with a central portion opened in a rectangular shape. However, the shape of the spacer 110 is not limited to this, for example, a cylindrical shape. It is good also as the external shape.

  A coil group is provided with the coil arrange | positioned in the aspect in which an axial center follows any one of a X direction, a Y direction, and a Z direction. It should be noted that the X direction, the Y direction, and the Z direction are relative ones that are orthogonal to each other, and there are no absolute ones such as the X axis.

The spacer 110 has a condition in which the axial centers of the coils X ₁ , X _2, etc. are orthogonal to the center in the length direction of the coils Z ₁ , Z ₂ . Thus, for example, it is shorter than the case where the coil X ₁ or the like is shown in relatively Figure 2 does not necessarily have to be provided a spacer 110.

  Further, the layout of the coil group can be changed so that the spacer 110 is not provided. Specifically, for example, it is also a method to prepare a substrate assembled in a cube and arrange the coils so that the axis of the coil is along the vertical direction of each substrate.

On the spacer 110, the coils X ₁ and X ₂ are placed in a manner in which the axial center is in the X direction, and the coils Y ₁ and Y ₂ are placed in a manner in which the axial center is in the Y direction. In addition, coils Z ₁ and Z ₂ are placed in the opening portion of the spacer 110 in such a manner that the axis is in the Z direction.

FIG. 2 shows an example in which the coils Z ₁ and Z ₂ are installed diagonally in the rectangular opening, but the mounting conditions are not limited to this, and the coils Z ₁ , Z ₂ may be placed under the condition of providing symmetry.

  In addition, as described above, the voltage output from the coil group is amplified by the amplifier connected to each coil. For example, an amplifier board is prepared below the board (not shown). It should be provided on this.

FIG. 3 is an explanatory diagram of the electrical connection of the electromagnetic field sensor 100 shown in FIG. Here, the electrical connection relationship between the coils X ₁ and X ₂ is shown, but the electrical connection relationship between the coils Y ₁ and Y ₂ and the coils Z ₁ and Z ₂ is also the same.

As shown in FIG. 3, for example, the winding start side of the coil _{X 1} is connected through a wire 130 to a first input terminal of the aforementioned amplifier (AMP) 120. Further, the winding end side of the coil X ₁ is serially connected to the winding start side of the coil X _2. Further, the winding end side of the coil X ₂ are connected through a wire 140 to the second input terminal of the aforementioned amplifier 120. Since the coil X _1, X _2, etc. are connected in series, a voltage based on the X component of the electromagnetic field induced in these are synthesized.

The output end of the amplifier 120 and the output ends of the amplifiers of the coils Y ₁ , Y ₂ , Z ₁ , and Z ₂ are connected to the spectrum analyzer 20 through cables.

  Here, any type of amplifier 120 may be used, but it is preferable to obtain a high gain in a wide frequency band. Therefore, it is preferable to employ a negative feedback multi-stage amplifier to lower the gain per stage and expand the frequency band accordingly.

Figure 4 is an explanatory view of a coil X ₁ shown in FIG. FIG. 4A shows a ferrite core constituting the coil, and FIG. 4B shows a state in which an electric wire is wound around the ferrite core shown in FIG. The coil _{X 1} other coil _Y 1 other than, _{Z 1} and the like are also the same structure as the coil _{X 1} shown in FIG.

Coil _{X 1,} for example, a diameter of about 14 mm, is a size that approximately 12mm in height. However, this size is an example, and it may be about 1.5 to 3 times larger than this, or smaller. However, coil X _1, when too small an attempt to increase the spatial resolution, because the reception sensitivity of the electromagnetic field is reduced, even if the smaller, it is possible to keep up to at most about half the size.

Coil X ₁ is, although the ferrite core as described above, particularly, for example, can be adopted a ferrite core including manganese and zinc. Specifically, when attention is paid to the magnetic permeability, ferrite materials called “2G4” and “2H6” can be suitably used in an ultra-low frequency region up to 100 kHz.

  In other words, when it is desired to measure the electromagnetic field strength in the high frequency region, a ferrite core containing nickel and zinc, such as a ferrite material called “7B2”, may be employed. However, in such a case, the amplifier 120 and the spectrum analyzer 400 may be changed to those for high frequency.

Coil X _1, it means that functions as an electromagnetic field antenna, its size, the determination of the shape is important. In general, the larger the antenna opening, the higher the reception level, but there is also a limitation on the size of the electromagnetic field sensor 100.

  In the present embodiment, the number of coils wound around the ferrite material is secured to some extent to increase the inductance. For this reason, as shown in FIG. 4, the coil winding area is secured larger than that of a general ferrite coil.

Wires forming the coil X _1, for example, can be suitably used for electromagnetic field sensor of a low frequency, it may be two or polyurethane coated copper wire. When such a conducting wire is used, a wire having a wire diameter of about 0.05φ to 0.16φ may be selected in order to secure a certain number of turns of the coil wound around the ferrite material.

  When the electric wire is mechanically wound, a wire having a diameter of about 0.05φ to 0.09φ may be employed. On the other hand, when it is manually wound, it is preferable to use a wire having a diameter of about 0.10 to 0.16. Which winding method is used has its advantages and disadvantages, and may be determined according to the electromagnetic field measurement target or measurement sensitivity.

In the case of manual winding can prevent an increase in the DC resistance of the coil X _1, include merit enhances the reception sensitivity of the electromagnetic field. On the other hand, in the case of mechanical winding, there is a merit that a detailed winding method can be performed and winding unevenness is hardly generated.

FIG. 5 is a diagram illustrating an arrangement example of the coil group illustrated in FIG. 3. The arrangement example shown in FIG. 5 is similar to the aspect shown in FIG. 2, but shows a case where the spacer 110 is not necessary due to the shape of the coil X ₁ or the like. If each coil is arranged in the mode shown in FIG. 5, the entire coil group has reception directivity characteristics close to a hemisphere.

Here, the coil X ₁ and the like are used in a balanced connection, the input of the amplifier 120 or the like is unbalanced connection. To achieve this difference per alignment, where a balun: It is one method provided between the "balanced-to-unbalanced transformer" signal conversion element such as a coil X ₁ or the like and the amplifier 120 or the like.

However, since the transformer has frequency amplitude characteristics and is not suitable for transmitting a wide frequency, a signal conversion IC having the same main function may be used instead of the signal conversion element. Accordingly, the voltage induced in coil X ₁ and the like, can be converted to without loss unbalanced inputs to the amplifier 120 or the like.

Claims (8)

A first input means for inputting electromagnetic wave measurement data received by a single probe;
Second input means for inputting position data in space for detecting the position of the probe;
An electromagnetic wave data management system comprising: a storage unit that stores the measurement data and probe position data input by the second input unit in association with each other when the measurement data is input by the first input unit. The probe includes a plurality of coils arranged in XYZ directions in which respective axes are orthogonal to each other,
The electromagnetic wave data management system of Claim 1 provided with the amplifier which amplifies the voltage based on the electromagnetic field induced by each said coil.   The electromagnetic wave data management system according to claim 1, further comprising notification means for notifying an operator of the probe that measurement of a frequency bandwidth corresponding to the measurement data is completed.   The electromagnetic wave data management system according to claim 1, further comprising display means for displaying each data stored by the storage means.   The electromagnetic wave data management system according to claim 1, further comprising a position sensor that outputs position data of the probe.   The electromagnetic wave data management system of Claim 1 provided with the frequency measuring device which outputs the measurement data of the electromagnetic waves received with the said probe. A step of inputting measurement data of electromagnetic waves received by a single probe;
Inputting spatial position data for detecting the position of the probe;
An electromagnetic wave data management method comprising: storing the measurement data and the position data of the probe in association with each other when the measurement data is input.   The electromagnetic wave data management program for making a computer perform each step of Claim 7.