JP5652763B2 - Electromagnetic field distribution measuring device - Google Patents

Description

  The present invention relates to an electromagnetic field distribution measuring apparatus and an electromagnetic field distribution measuring method.

  In recent years, there has been an increasing interest in the influence of electromagnetic fields on living bodies. For this reason, visualization of the electromagnetic field distribution is required. In addition, the electromagnetic field distribution is measured for various purposes, not limited to the investigation of the influence on the living body.

  In the measurement of the electromagnetic field distribution, it is important to identify the spatial measurement position. As a method for identifying a measurement position in conventional electromagnetic field distribution measurement, a method using a magnetic position sensor or a method using a camera has been proposed.

  The method using a magnetic position sensor is a method using a magnetic tracker as a position sensor (see, for example, Patent Document 1 and Non-Patent Document 1). The magnetic tracker is widely used as a position sensor because it has high position specifying accuracy and can obtain detailed position information such as three-dimensional coordinates and angle information.

  On the other hand, a method using a camera is a method for optically specifying a position by performing a feature point detection process on an image photographed by a CCD (Charge Coupled Device) camera or the like (for example, see Non-Patent Document 2). .

JP 2008-45899 A

K. Sato, N. Miyata, Y. Kamimura and Y. Yamada, "A Freehand Scanning Method for Measuring EMF Distributions Using Magnetic Tracker", IEICE Trans E93.B (7), pp1865-1868, July 2010. K. Sato, H. Kawata and Y. Kamimura, "A Measurement Method for 2-D EMF Distributions Using Optical Tracker", 4th Pan-Pacific EMC Joint Meeting, May 2010.

  According to the measurement position identification method using the conventional magnetic tracker, sufficient detection accuracy of the position can be obtained, but there is a problem that the measurement accuracy is remarkably lowered when a metal exists in the measurement environment. In addition, there must be a mechanism to sufficiently reduce the influence of the electromagnetic field emitted from the transmitter of the magnetic tracker on the measurement area.

  On the other hand, in optical tracking using a conventional camera, it may be difficult to specify the position depending on the brightness of the measurement region. For example, when a bright area such as a fluorescent lamp is a measurement object, or an area whose brightness changes during measurement such as a TV area is a measurement object, the measurement position is identified with sufficient accuracy. I can't do it. For this reason, in the optical tracking, it is necessary to keep the brightness of the measurement region at a constant brightness sufficiently dark.

  From such a background, it is desired to develop a technique for easily identifying a measurement position and measuring an electromagnetic field distribution without depending on a measurement environment such as brightness and presence / absence of metal.

  An object of the present invention is to provide an electromagnetic field distribution measuring apparatus and an electromagnetic field distribution measuring method capable of identifying a measurement position with higher accuracy and measuring an electric field distribution or a magnetic field distribution regardless of a measurement environment. To do.

The electromagnetic field distribution measuring apparatus according to the present invention includes a first light source that emits invisible light composed of infrared light or ultraviolet light, and a second light source that emits blinking visible light or modulated visible light. A plurality of detectors for detecting the invisible light and the visible light from the first light source and the second light source, and detection information of the invisible light and the visible light in the plurality of detectors. , determine the electromagnetic field distribution information of three-dimensional for each spatial position of the electromagnetic field sensor based on the relative positional relationship between the electromagnetic field strength and the plurality of detectors measured by the electromagnetic field sensor, and the invisible Detecting the abnormal value of the position of the measurement point based on the history of the measurement point of the electromagnetic field intensity obtained from the detection information of one of the light and the visible light, the position of the measurement point determined as an abnormal value, The other detection information And a magnetic field distribution information generating means for correcting, based on the position of the measurement point of the electromagnetic field intensity obtained from.
An electromagnetic field distribution measuring apparatus according to the present invention includes an electromagnetic field sensor provided with a first light source that emits infrared light and a second light source that emits ultraviolet light, and the first light source and the second light source. A plurality of detectors for detecting the infrared light and ultraviolet light from a light source; detection information of the infrared light and ultraviolet light in the plurality of detectors; electromagnetic field intensity measured by the electromagnetic field sensor; The three-dimensional electromagnetic field distribution information for each spatial position of the electromagnetic field sensor is obtained based on the relative positional relationship between the detectors, and the electromagnetic wave obtained from the detection information of one of the infrared light and ultraviolet light An abnormal value of the position of the measurement point is detected based on a history of measurement points of field strength, and the position of the measurement point determined to be an abnormal value is obtained from the measurement point of the electromagnetic field strength obtained from the other detection information. Electromagnetic field distribution to be corrected based on position And a multi-address generating means.

The electromagnetic field distribution measuring method according to the present invention includes a first light source that emits invisible light composed of infrared light or ultraviolet light, and a second light source that emits blinking visible light or modulated visible light. The electromagnetic field intensity is measured using an electromagnetic field sensor to which the invisible light and the visible light are detected by a plurality of detectors, the invisible light and the visible light detection information in the plurality of detectors, Based on the electromagnetic field intensity measured by the next sensor and the relative positional relationship in the plurality of detection periods, three-dimensional electromagnetic field distribution information for each spatial position of the electromagnetic field sensor is obtained, and the invisible light and An abnormal value of the position of the measurement point is detected based on the history of the measurement point of the electromagnetic field intensity obtained from one detection information of the visible light, and the position of the measurement point determined to be an abnormal value is From detection information Is the is corrected based on the position of the measurement point of an electromagnetic field intensity.
The electromagnetic field distribution measuring method according to the present invention measures the electromagnetic field intensity using an electromagnetic field sensor to which a first light source that emits infrared light and a second light source that emits ultraviolet light are attached. Infrared light and ultraviolet light are detected by a plurality of detectors, detection information of the infrared light and ultraviolet light in the plurality of detectors, electromagnetic field intensity measured by the electromagnetic field sensor, and between the plurality of detectors The three-dimensional electromagnetic field distribution information for each spatial position of the electromagnetic field sensor is obtained based on the relative positional relationship of the electromagnetic field sensor, and the electromagnetic field intensity measurement point obtained from one of the infrared light and ultraviolet light detection information The abnormal value of the position of the measurement point is detected based on the history of the measurement point, and the position of the measurement point determined to be an abnormal value is corrected based on the position of the measurement point of the electromagnetic field intensity obtained from the other detection information To do.

  According to the electromagnetic field distribution measuring apparatus and the electromagnetic field distribution measuring method according to the present invention, the electric field distribution or the magnetic field distribution can be measured by identifying the measurement position with higher accuracy regardless of the measurement environment.

The block diagram of the electromagnetic field distribution measuring apparatus which concerns on the 1st Embodiment of this invention. The circuit diagram which shows the circuit structural example of IR marker shown in FIG. The enlarged view which shows the attachment method of the IR marker to the electromagnetic field sensor shown in FIG. The figure explaining an example of the method of the interpolation process in the data interpolation part of the computer shown in FIG. The figure which shows the structural example of the screen displayed on the display apparatus of the computer shown in FIG. The figure which shows the example which displayed the electromagnetic field distribution map on the screen shown in FIG. The top view which shows the structural example of IR detector with which the electromagnetic field distribution measuring apparatus which concerns on the 2nd Embodiment of this invention is equipped. FIG. 8 is a side view of the IR detector shown in FIG. 7. The block diagram of the data collection system with which the electromagnetic field distribution measuring apparatus which concerns on the 3rd Embodiment of this invention is equipped.

  An electromagnetic field distribution measuring apparatus and an electromagnetic field distribution measuring method according to an embodiment of the present invention will be described with reference to the accompanying drawings.

(First embodiment)
(Configuration and function)
FIG. 1 is a configuration diagram of an electromagnetic field distribution measuring apparatus according to a first embodiment of the present invention.

  The electromagnetic field distribution measuring apparatus 1 is an apparatus that measures an electromagnetic field distribution in a two-dimensional (2D) measurement region around an object O that emits electromagnetic waves such as a fluorescent lamp. For this purpose, the electromagnetic field distribution measuring apparatus 1 includes an electromagnetic field sensor 2, an infrared (IR) marker 3, a CCD camera 4, an IR detector 5, a guide sheet 6, and a computer 7.

  An IR marker 3 is attached to the electromagnetic field sensor 2. A computer 7 is connected to the output destinations of the electromagnetic field sensor 2, the CCD camera 4 and the IR detector 5 by wire or wirelessly. In FIG. 1, the output side of the electromagnetic field sensor 2 and the CCD camera 4 is connected to the computer 7 by a signal line such as a USB (Universal Serial Bus) cable, while the output side of the IR detector 5 is connected to the computer 7 wirelessly. An example is shown.

  The electromagnetic field sensor 2 is a portable EMF (electromagnetic field) dosimeter that measures electromagnetic field strength. The electromagnetic field sensor 2 includes an electric field sensor unit that measures the strength of the electric field and a magnetic field sensor unit that measures the strength of the magnetic field. The electromagnetic field sensor 2 has a function of outputting one or both of the electric field intensity and the magnetic field intensity detected by the electric field sensor unit or the magnetic field sensor unit as a digital signal of the electromagnetic field intensity. For example, an EMF dosimeter capable of measuring an electric field and a magnetic field in a desired frequency band such as an electric field frequency range of 3 MHz to 7 GHz and a magnetic field frequency range of 3 MHz to 1 GHz can be used as the electromagnetic field sensor 2.

  The IR marker 3 is configured using a light source that emits infrared light. As a practical light source, there is an IR light emitting diode (LED).

  FIG. 2 is a circuit diagram showing a circuit configuration example of the IR marker 3 shown in FIG. 1, and FIG. 3 is an enlarged view showing a method of attaching the IR marker 3 to the electromagnetic field sensor 2 shown in FIG.

  As shown in FIG. 2, the IR marker 3 can be configured by a closed circuit in which a resistor, a voltage, and a switch are connected in series to an IR LED. Figure 2 shows a 33Ω resistor and a switch connected in series to an IR LED with a forward voltage of 1.35V, an infrared light emission intensity of 20mW / sr, an infrared light energy of 11mW, and a half-value angle of ± 23.5 °. The example which comprised IR marker 3 with the circuit which applies the DC voltage of 3V is shown.

  The IR marker 3 having such a circuit configuration is fixed to the electromagnetic field sensor 2. As shown in FIG. 3, the electromagnetic field sensor 2 is configured, for example, by providing a sensor portion 2B on one surface of a columnar body 2A that also serves as a grip. The IR marker 3 is provided at a position where infrared light can be irradiated toward the IR detector 5 when the sensor unit 2B of the electromagnetic field sensor 2 is directed toward the measurement region. Accordingly, the IR marker 3 is attached to the surface of the body 2A opposite to the sensor unit 2B. FIG. 3 shows an example in which the plate-like IR marker 3 and the sensor unit 2B are provided on both sides of the body 2A.

  The IR marker 3 is disposed at a position where the influence of the electromagnetic field generated by the circuit constituting the IR marker 3 on the sensor unit 2B can be sufficiently ignored. Therefore, a shim member 8 for adjusting the distance between the IR marker 3 and the sensor unit 2B is provided as necessary. In the example of FIG. 3, a plate-like shim member 8 is provided between the body 2 </ b> A and the IR marker 3. The thickness of the shim member 8 corresponding to the distance direction between the IR marker 3 and the sensor unit 2B is examined whether or not the electromagnetic field emitted from the IR marker 3 is detected by the sensor unit 2B as a signal value that cannot be ignored. Can be determined experimentally.

  The CCD camera 4 is a device that monitors an electromagnetic field measurement region including the electromagnetic field sensor 2 and outputs 2D image data as a video in real time. Accordingly, the CCD camera 4 is installed at a position where the electromagnetic field measurement region can be included in the field of view.

  The IR detector 5 has a function of two-dimensionally detecting infrared light irradiated from the IR marker 3 and outputting the detection information of the infrared light as 2D position information of the IR marker 3 in real time. Therefore, the frequency range of the infrared light that can be detected by the IR detector 5 is adjusted to the frequency of the infrared light emitted from the IR marker 3. For this reason, according to the IR detector 5, the temporal position change of the IR marker 3 can be tracked and acquired as trajectory information of the IR marker 3.

  The IR detector 5 has an electromagnetic field measurement area within the effective visual field, and is installed at a position where infrared light emitted from the IR marker 3 attached to the electromagnetic field sensor 2 can be directly received. Although FIG. 1 shows an example in which the IR detector 5 and the CCD camera 4 are integrated, the IR detector 5 and the CCD camera 4 may be individually installed.

  More specifically, the IR detector 5 includes an IR camera 5A, an ADC (analog to digital converter) 5B, an arithmetic unit 5C, and a wireless transmission antenna 5D. A program for generating position information of the IR marker 3 based on 2D digital image information of infrared light captured by the IR camera 5A is read in the arithmetic device 5C in advance. Then, the IR detector 5 calculates the 2D position of the IR marker 3 sequentially calculated in the arithmetic unit 5C based on the 2D digital image information of the infrared light imaged by the IR camera 5A and the effective visual field area information of the IR camera 5A. The time-series vector information shown is configured to be wirelessly transmitted from the wireless transmission antenna 5D as position information.

  It should be noted that some components of the IR detector 5 such as the ADC (analog to digital converter) 5B and the arithmetic device 5C or the function of the arithmetic device 5C may be provided on the computer 7 side.

  The guide sheet 6 is arranged as necessary in accordance with the 2D surface to be measured for the electromagnetic field. FIG. 1 shows an example in which a planar area near a fluorescent lamp is used as an electromagnetic field measurement area. For this reason, the guide sheet 6 that forms a flat surface so as to coincide with the surface to be measured of the electromagnetic field is disposed. By installing the guide sheet 6, the user can easily move the electromagnetic field sensor 2 two-dimensionally on the measurement surface. The guide sheet 6 is made of a non-metallic non-conductive material so that the influence on the electromagnetic field to be measured can be ignored. When the measurement region is a curved surface or a discontinuous surface, the shape of the guide sheet 6 can be determined according to the shape of the measurement region.

  The computer 7 includes an arithmetic device 9, a storage device 10, an input device 11, a display device 12, an input / output terminal 13, and a wireless reception antenna 14. The storage device 10 stores in advance an electromagnetic field distribution visualization program for performing data processing for visualizing the measurement result of the electromagnetic field distribution. The arithmetic device 9 functions as the video information generation unit 15, the electromagnetic field distribution information generation unit 16, and the screen information generation unit 17 by reading the electromagnetic field distribution visualization program. The electromagnetic field distribution information generation unit 16 includes an electromagnetic field map generation unit 18, a position correction unit 19, and a data interpolation unit 20.

  The video information generation unit 15 acquires 2D image data from the CCD camera 4 via the input / output terminal 13 in real time and generates video information of a measurement region for display on the display device 12, and the generated video A function of giving information to the screen information generation unit 17.

  Instructions for starting and ending processing in the video information generation unit 15 such as acquisition of 2D image data and generation of video information can be input from the input device 11. For this reason, the video information generation unit 15 is configured to give the screen information generation unit 17 screen information including image information such as an electronic key necessary for inputting instruction information in addition to the video information.

  The electromagnetic field distribution information generation unit 16 acquires the electromagnetic field intensity from the electromagnetic field sensor 2 via the input / output terminal 13 in real time, while the 2D position information of the IR marker 3 from the IR detector 5 via the wireless reception antenna 14. A function for acquiring the electromagnetic field distribution information indicating the electromagnetic field intensity for each position of the electromagnetic field sensor 2 based on the function of acquiring the electromagnetic field in real time, the electromagnetic field intensity and the 2D position information of the IR marker 3 and the generated electromagnetic field distribution information It has a function to be given to the screen information generation unit 17.

  Instructions for starting and ending processing in the electromagnetic field distribution information generation unit 16 such as acquisition of electromagnetic field intensity and 2D position information of the IR marker 3 and generation of electromagnetic field distribution information can also be input from the input device 11. For this reason, the electromagnetic field distribution information generation unit 16 is configured to give the screen information generation unit 17 screen information including image information such as an electronic key necessary for inputting instruction information.

  The electromagnetic field map generation unit 18 is based on the 2D position information of the IR marker 3, the relative positional relationship between the IR marker 3 and the sensor unit 2 </ b> B of the electromagnetic field sensor 2, and the electromagnetic field intensity detected by the electromagnetic field sensor 2. The function of sequentially identifying the position of the electromagnetic field sensor 2, that is, the 2D position of the measurement point at which the electromagnetic field intensity is measured, and the identification processing of each measurement point corresponding to a plurality of electromagnetic field intensities acquired as time-series data And a function of generating an electromagnetic field distribution map indicating the electromagnetic field intensity at each position in the measurement region based on the result. The electromagnetic field distribution map corresponds to the 2D position information of the IR marker 3 and is created in real time by sequentially storing the electromagnetic field strength values in 2D array positions representing each position in the electromagnetic field measurement area. can do.

  The position correction unit 19 has a function of detecting, as an error, an abnormal value of the 2D position of the identified measurement point based on the history information of the 2D position of the measurement point of the electromagnetic field intensity corresponding to the 2D position information of the IR marker 3 And a function of correcting the 2D position of the measurement point determined to be an error based on the 2D position of another measurement point. The 2D position of the past measurement point can be obtained in the electromagnetic field map generation unit 18 as trajectory information corresponding to the acquisition time of the electromagnetic field intensity. Therefore, by comparing the 2D position corresponding to each time with the 2D position corresponding to another time, it is possible to perform an error determination process as to whether or not each 2D position is an abnormal value.

  The error determination process can be performed by an arbitrary singularity detection process based on the history information of the 2D position. For example, when the 2D position corresponding to each time is compared with the 2D position corresponding to the immediately preceding time and the deviation amount exceeds the threshold, it can be determined as an error. Or, if the 2D position corresponding to each time is compared with the 2D position calculated by interpolation or curve fitting from the 2D position corresponding to a plurality of times before and after the time, the deviation amount exceeds the threshold, It can also be determined.

  The 2D position determined as an error can be corrected by a desired correction process. Examples of the correction method include a correction method based on interpolation processing or curve fitting based on other 2D positions. That is, the 2D position determined as an error can be corrected by replacing or weighted addition of the 2D position calculated by interpolation processing or curve fitting based on another 2D position and the 2D position determined as an error. .

  The data interpolation unit 20 has a function of obtaining the value of the electromagnetic field intensity at the position where the electromagnetic field intensity is not measured by interpolation processing based on the value of the electromagnetic field intensity measured at the other position, and the calculation of the obtained electromagnetic field intensity. A function of storing the value in an array position constituting the electromagnetic field distribution map. The interpolation may be either linear interpolation or non-linear interpolation. However, the electromagnetic field intensity having sufficient accuracy can be calculated with a simple process by performing linear interpolation.

  FIG. 4 is a diagram for explaining an example of a method of interpolation processing in the data interpolation unit 20 of the computer 7 shown in FIG.

  4A, 4B, 4C, and 4D, the horizontal axis represents the X axis set in the electromagnetic field measurement region, and the vertical axis represents the Y axis orthogonal to the X axis. That is, each drawing in FIG. 4 shows an XY plane coordinate system representing a 2D measurement region.

  As shown in FIG. 4A, the case where the electromagnetic field strength is measured at a plurality of discrete 2D array positions will be described as an example. In this case, if a plurality of electromagnetic field strengths are measured in one direction, for example, the X-axis direction in the same Y coordinate, the value between the measured values in the same Y coordinate is calculated as shown in FIG. It can be calculated by linear interpolation in the X-axis direction.

  Similarly, as shown in FIG. 4C, a value between measured values at the same X coordinate can be calculated by linear interpolation in the Y-axis direction. In this case, a calculated value obtained by linear interpolation in the X-axis direction can be used for linear interpolation in the Y-axis direction. This makes it possible to create an electromagnetic field intensity distribution map that covers a large number of arrangement positions based on fewer measurement values. FIG. 4D shows an example in which electromagnetic field intensity values at all arrangement positions are obtained by linear interpolation.

  From the viewpoint of grasping the reliability of the electromagnetic field distribution map, it is desirable that the calculated value of the electromagnetic field intensity estimated by the interpolation process and the measured value of the electromagnetic field intensity by the electromagnetic field sensor 2 can be distinguished. In the examples of FIGS. 4B, 4C, and 4D, the calculated value of the electromagnetic field intensity is shown in italics, but when displayed on the display device 12, it is preferable to display the identification value. It is.

  When the measured value of the electromagnetic field intensity at the array position where the value is estimated by interpolation is obtained, the calculated value by interpolation can be replaced with the measured value. As a result, the electromagnetic field strength distribution map is quickly generated based on the measurement data having a smaller electromagnetic field strength, and when the measurement data is newly obtained, the electromagnetic field strength distribution map is updated to improve the accuracy. be able to.

  The screen information generation unit 17 uses the video information of the measurement region generated by the video information generation unit 15 and the electromagnetic field distribution information generated by the electromagnetic field distribution information generation unit 16 to display on the display device 12. A function of generating information and a function of causing the display device 12 to output screen information. For example, the image information of the measurement region and the electromagnetic field distribution map can be displayed in parallel on the display device 12, or the electromagnetic field distribution map can be displayed superimposed on the video information of the measurement region.

(Operation and action)
Next, the operation and action of the electromagnetic field distribution measuring apparatus 1 will be described.

  When the electromagnetic field distribution measuring apparatus 1 visualizes the electromagnetic field distribution in the 2D measurement region in the vicinity of the object O such as a fluorescent lamp, the hardware constituting the electromagnetic field distribution measuring apparatus 1 is arranged in an appropriate position in advance. The That is, the planar guide sheet 6 is installed along the 2D measurement region. In addition, the CCD camera 4 and the IR detector 5 are installed at positions where the field of measurement of the electromagnetic field distribution can be included in the field of view.

  When the operation of the CCD camera 4 is turned on, an image in the field of view including the measurement region is output to the computer 7 as time-series 2D image data. Then, the video information generation unit 15 of the computer 7 acquires 2D image data via the input / output terminal 13 and gives it to the screen information generation unit 17.

  Further, when the operation of the IR detector 5 is turned on, it is possible to detect the presence and position of infrared light within the effective visual field including the measurement region. From the IR detector 5, in addition to the position information of the detected infrared light, effective field information of the IR detector 5 can be wirelessly transmitted to the computer 7.

  Information wirelessly transmitted from the IR detector 5 can be received by the wireless reception antenna 14 of the computer 7. The received information is given to the electromagnetic field distribution information generation unit 16 of the computer 7. When the effective visual field information of the IR detector 5 is given to the electromagnetic field distribution information generation unit 16, image information for displaying the effective visual field of the IR detector 5 can be generated. The generated effective visual field information of the IR detector 5 is given from the electromagnetic field distribution information generating unit 16 to the screen information generating unit 17 together with image information such as an electronic key necessary for inputting instruction information.

  The screen information generation unit 17 uses the 2D image data as the video information acquired from the video information generation unit 15 and the image information such as the electronic key acquired from the electromagnetic field distribution information generation unit 16 to display on the display device 12. Generate screen information. The generated screen information is displayed on the display device 12.

  FIG. 5 is a diagram showing a configuration example of a screen displayed on the display device 12 of the computer 7 shown in FIG.

  For example, as shown in FIG. 5, the screen displayed on the display device 12 is provided with an area for displaying the image of the CCD camera 4 and an area for displaying XY coordinates for mapping the electromagnetic field distribution of the measurement region. In the example of FIG. 5, an image near the fluorescent lamp is displayed in the left area of the screen, and the XY coordinate system is displayed in the right area. Furthermore, the effective field of view of the IR detector 5 is superimposed on the image of the CCD camera 4 as a rectangular frame.

In the example of FIG. 5, a start button for instructing the start of measurement of the electromagnetic field distribution and an end button for instructing the end of measurement are displayed. Furthermore, it is possible to provide an area for displaying the electric field strength [mV / m] and the magnetic field strength [μA / m] at coordinates (X, Y) as numerical values. The electric flux density [C / m ² ] and the magnetic flux density [T] may be displayed as the electric field strength and magnetic field strength.

  Thereby, the user can measure the electromagnetic field distribution in the measurement region in real time while confirming the image around the measurement region. The measurement of the electromagnetic field distribution can be performed freehand using the portable electromagnetic field sensor 2. That is, the user can measure the magnetic field strength or electric field strength at each measurement point by moving the sensor unit 2B of the electromagnetic field sensor 2 so as to pass through each measurement point in the measurement region.

  At this time, the guide sheet 6 can be used for positioning the electromagnetic field sensor 2. That is, by moving the electromagnetic field sensor 2 along the guide sheet 6, the measurement point of the electromagnetic field distribution can be adjusted to the 2D measurement region.

  When the electromagnetic field sensor 2 is arranged at the measurement point, the electromagnetic field intensity at the measurement point is measured. The measured value of the electromagnetic field intensity is sequentially output from the electromagnetic field sensor 2 to the computer 7. On the other hand, infrared light emitted from the IR marker 3 fixed to the electromagnetic field sensor 2 is detected by the IR detector 5. In the IR detector 5, the 2D position of the IR marker 3 is obtained based on the detection result of the infrared light. The obtained 2D position information of the IR marker 3 is sequentially wirelessly transmitted from the IR detector 5 to the computer 7.

  For this reason, when the electromagnetic field sensor 2 moves, the measurement data of the electromagnetic field intensity by the electromagnetic field sensor 2, the 2D position information of the IR marker 3, and the image of the CCD camera 4 are sequentially input to the computer 7. Then, the electromagnetic field map generation unit 18 sequentially identifies the measurement points of the electromagnetic field intensity measured by the electromagnetic field sensor 2 based on the 2D position information of the IR marker 3.

  Then, the electromagnetic field map generation unit 18 generates electromagnetic field distribution map information indicating the electromagnetic field intensity for each measurement point, using the measurement point identification result and the electromagnetic field intensity measurement data obtained by the electromagnetic field sensor 2. That is, the measured values of the electromagnetic field strength are sequentially stored in the 2D array positions corresponding to the respective measurement points in the measurement region.

  Further, the position correction unit 19 performs measurement point error detection processing based on the history information obtained as the locus of the electromagnetic field intensity measurement point. When an error is detected, the position correction unit 19 executes measurement point correction processing such as interpolation and curve fitting based on 2D position information of other measurement points. For this reason, even if there is an object that emits infrared light in the vicinity of the electromagnetic field intensity measurement region and the IR detector 5 erroneously recognizes that the object is the IR marker 3, the electromagnetic field intensity measurement is performed. The point can be corrected appropriately.

  Furthermore, the data interpolation unit 20 obtains the value of the electromagnetic field intensity at the unmeasured position by interpolation processing using the measurement data. The calculated calculated value of the electromagnetic field intensity is stored in the 2D array position constituting the electromagnetic field distribution map information. Thereby, the global electromagnetic field distribution map information in the measurement region can be obtained quickly.

  FIG. 6 is a diagram showing an example in which an electromagnetic field distribution map is displayed on the screen shown in FIG.

  As shown in FIG. 6, an electromagnetic field distribution map can be displayed on the XY coordinates. Also, the measurement point of the electromagnetic field intensity and the mark representing the measurement result can be displayed superimposed on the image of the CCD camera 4. The value of the electromagnetic field intensity can be displayed using a grace scale or a color scale corresponding to the value. In the example of FIG. 6, it is possible to easily grasp the measurement points of the electromagnetic field intensity and the distribution of the measurement values in the vicinity of the fluorescent lamp.

  Further, the locus of the IR marker 3 can be superimposed on the image of the CCD camera 4 and the electromagnetic field distribution map. That is, measurement points that are close in time can be connected by a line and displayed as a locus of the IR marker 3. FIG. 6 shows an example in which the locus of the IR marker 3 is displayed as a broken line using measurement data every 250 ms.

  For this reason, the user can visually recognize the electromagnetic field distribution in a desired measurement region around the object O such as a fluorescent lamp as an image. Further, in the electromagnetic field distribution measuring apparatus 1, since the measurement position of the electromagnetic field intensity can be freely determined by freehand, more detailed measurement is continuously performed while referring to the electromagnetic field distribution map as shown in FIG. Is possible.

  That is, the electromagnetic field distribution measuring apparatus 1 as described above uses the IR marker 3 for detecting the position of the electromagnetic field sensor 2.

(effect)
Therefore, according to the electromagnetic field distribution measuring apparatus 1, unlike the conventional method using the magnetic position sensor, there is no electromagnetic interference of the position measuring system with respect to the electromagnetic field to be measured, and the electromagnetic field intensity measurement area is close to Even when a conductor such as a metal exists, the measurement point of the electromagnetic field strength can be accurately identified.

  Further, unlike the conventional optical tracking, the electromagnetic field strength measurement point can be obtained stably without depending on the brightness of the measurement region. In particular, according to the electromagnetic field distribution measuring apparatus 1, even when the measurement region of the electromagnetic field intensity is dark, the electromagnetic field distribution information can be obtained by accurately specifying the measurement point of the electromagnetic field intensity.

  Furthermore, if an IR LED is used as the IR marker 3, a position sensor can be constructed at a lower cost than a magnetic position sensor.

(Modification)
In the above example, infrared light is used to identify the measurement point of the electromagnetic field intensity by the electromagnetic field sensor 2, but ultraviolet light (UV) may be used. When using ultraviolet light, the electromagnetic field distribution measuring apparatus 1 is provided with a UV marker and a UV detector having functions equivalent to those of the IR marker 3 and the IR detector 5, respectively, instead of the IR marker 3 and the IR detector 5. .

  That is, if the electromagnetic wave has a wavelength that can be distinguished from the electromagnetic wave such as visible light observed from the electromagnetic field intensity measurement region and that can interfere with the electromagnetic field to be measured, the electromagnetic field intensity can be measured. Can be used for point identification.

  Note that infrared light is an electromagnetic wave having a wavelength longer than that of visible light and shorter than a radio wave having a millimeter wavelength. The wavelength of infrared light is about 0.7 μm to 1 mm. On the other hand, ultraviolet light is an electromagnetic wave having a wavelength shorter than that of visible light and longer than that of soft X-rays. The wavelength of ultraviolet light is about 10 nm to 400 nm. Infrared light and ultraviolet light are called invisible light with respect to visible light having a wavelength of about 760 nm to 830 nm.

  Moreover, even if it is visible light, if it can discriminate | determine from visible light observed from the measurement area | region of electromagnetic field intensity | strength, it can utilize for the identification of the measurement point of electromagnetic field intensity | strength. Therefore, visible light blinking in a predetermined pattern or visible light obtained by modulating one or both of the amplitude and frequency can be used for identifying the measurement point of the electromagnetic field intensity.

  In this case, a visible light marker can be configured by connecting a circuit or a modulation circuit for blinking visible light to a light source such as a visible light LED that emits visible light. Furthermore, the CCD camera 4 can be used as a visible light detector. Of course, a separate visible light detector as a position sensor may be provided in the electromagnetic field distribution measuring apparatus 1 separately from the CCD camera 4. Then, the position of the visible light marker can be obtained by image processing for specifying the position of the visible light or the modulated visible light blinking in a predetermined pattern in the arithmetic device or the computer 7 incorporated in the visible light detector.

  Even when invisible light is used, it can be used by blinking or modulating the invisible light. In this case, even if infrared light or ultraviolet light is generated in the measurement region, the infrared light or ultraviolet light for identifying the position of the electromagnetic field sensor 2 can be identified.

(Second Embodiment)
FIG. 7 is a top view showing a configuration example of an IR detector provided in the electromagnetic field distribution measuring apparatus according to the second embodiment of the present invention, and FIG. 8 is a side view of the IR detector shown in FIG.

  The electromagnetic field distribution measuring apparatus 1 </ b> A according to the second embodiment is configured to perform information processing of the computer 7 using the 2D position information of the IR marker 3 detected by the points including the plurality of IR detectors 5 and the plurality of IR detectors 5. The method is different from the electromagnetic field distribution measuring apparatus 1 according to the first embodiment shown in FIG. Other configurations and operations are substantially the same as those of the electromagnetic field distribution measuring apparatus 1 shown in FIG. For this reason, only a configuration example of the plurality of IR detectors 5 is shown, and description of other components is omitted.

  As shown in FIG. 7, the electromagnetic field distribution measuring apparatus 1 </ b> A includes a plurality of IR detectors 5. FIG. 7 shows an example in which two IR detectors 5 are connected via a connecting member 30. Each IR detector 5 is slidably attached to the connecting member 30 via a slide mechanism 31. For this reason, the interval between the IR detectors 5 can be adjusted by sliding the IR detector 5 in the longitudinal direction of the connecting member 30 using the slide mechanism 31.

  Further, a memory 32 for confirming the distance between the IR detectors 5 is shaken in the connecting member 30. For this reason, the interval between the IR detectors 5 can be easily confirmed.

  The two IR detectors 5 connected to each other can be integrated with the CCD camera 4 similarly to the electromagnetic field distribution measuring apparatus 1 shown in FIG.

  When the IR detector 5 is configured in this way, the IR marker 3 is geometrically based on the relative positional relationship between the IR detectors 5 and the 2D position information of the IR marker 3 detected by each IR detector 5. And the IR detector 5 can be obtained.

  Therefore, the electromagnetic field map generation unit 18 has a function of obtaining the spatial position of the IR marker 3 based on the interval between the IR detectors 5 and the 2D position information of the IR marker 3 detected by each IR detector 5. It is done. Therefore, the electromagnetic field map generation unit 18 can obtain three-dimensional (3D) electromagnetic field distribution information for each spatial position of the electromagnetic field sensor 2.

  Instead of analytically calculating the spatial position of the IR marker 3 or the electromagnetic field sensor 2 based on the 2D position information of the IR marker 3 detected by each IR detector 5, the distance between the IR detectors 5 is calculated. The IR marker is obtained by experimentally acquiring the correspondence relationship between the 2D position of the IR marker 3 detected by each IR detector 5 and the spatial position of each IR marker 3 or the electromagnetic field sensor 2 and creating a database or formulating the IR marker. 3 or the spatial position of the electromagnetic field sensor 2 may be obtained. If the spatial position of each IR marker 3 or electromagnetic field sensor 2 is obtained based on the actual measurement value, an error between the hardware and the model used for analysis can be reduced.

  In this case, the relationship between the distance between the IR detectors 5, the 2D position of the IR marker 3 detected by each IR detector 5, and the spatial position of each IR marker 3 or electromagnetic field sensor 2 is stored in the electromagnetic field map generation unit 18. The indicated table or approximate function is stored. Then, the electromagnetic field map generation unit 18 inputs the distance between the IR detectors 5 and the 2D position of the IR marker 3 detected by each IR detector 5 and refers to the table 3 or the approximate function, and each marker 3 or It is configured to output the spatial position of the electromagnetic field sensor 2.

  That is, the electromagnetic field distribution measuring apparatus 1A is provided with a plurality of IR detectors 5 so that the distance between the IR marker 3 and each IR detector 5 can be obtained and the 3D position of the IR marker 3 can be obtained. It is.

  Therefore, according to the electromagnetic field distribution measuring apparatus 1A, not only can the 3D electromagnetic field distribution information be obtained, but also when the IR marker 3 is not facing the IR detector 5 side, Even when the elevation angle with respect to 5 is inclined, the spatial position of the electromagnetic field sensor 2 can be specified with high accuracy.

  In addition, you may make it identify the relative positional relationship between IR detectors 5 by arrange | positioning in a predetermined position, without connecting the some IR detector 5 with the connection member 30. FIG.

(Third embodiment)
FIG. 9 is a configuration diagram of a data collection system provided in the electromagnetic field distribution measuring apparatus according to the third embodiment of the present invention.

  An electromagnetic field distribution measuring apparatus 1B according to the third embodiment includes a configuration of a data collection system including an electromagnetic field sensor 2, a CCD camera 4, and an IR detector 5, and information in a computer 7 for obtaining the position of the electromagnetic field sensor 2. The processing method is different from the electromagnetic field distribution measuring apparatus 1 according to the first embodiment shown in FIG. Other configurations and operations are substantially the same as those of the electromagnetic field distribution measuring apparatus 1 shown in FIG. For this reason, only a configuration example of the data collection system is illustrated, and description of other components is omitted.

  In the electromagnetic field distribution measuring apparatus 1B, a plurality of optical markers that emit the same kind or different kinds of light are attached to the body 2A opposite to the sensor unit 2B of the electromagnetic field sensor 2 with the shim member 8 interposed therebetween. That is, the electromagnetic field sensor 2 is provided with a plurality of light sources that emit light having different wavelength bands and a plurality of light sources that emit light having the same wavelength band. FIG. 9 shows an example in which the electromagnetic field sensor 2 is provided with two IR markers 3, two UV markers 40 and one visible light marker 41. However, the visible light marker 41 includes a light source that emits blinking visible light or modulated visible light.

  On the other hand, at least one light detector corresponding to the type of optical marker provided in the electromagnetic field sensor 2 is connected to the CCD camera 4 by a connecting member 30. In the example of FIG. 9, two IR detectors 5 and two UV detectors 42 for detecting invisible light from the IR marker 3 and the UV marker 4 are connected to the CCD camera 4.

  The visible light from the visible light marker 41 can be detected by the CCD camera 4. That is, the CCD camera 4 can be used as a detector for visible light emitted from the visible light marker 41. The process of detecting the position of visible light from the visible light marker 41 from the image data photographed by the CCD camera 4 is performed in the electromagnetic field map generation unit 18 by a feature point detection process based on a blinking pattern of visible light or modulation information. be able to.

  If a plurality of optical markers that emit light of the same or different wavelength bands are attached to the electromagnetic field sensor 2, the electromagnetic field sensor is based on the relative positional relationship between the optical markers and the light detection information from each optical marker. The two spatial positions can be determined geometrically. In addition, if a plurality of photodetectors that detect light of the same or different wavelength bands are used, the electromagnetic field sensor 2 is based on the relative positional relationship between the photodetectors and the light detection information of each photodetector. Can be obtained geometrically. Therefore, by using a desired combination of marker and detector, the electromagnetic field map generation unit 18 can obtain 3D electromagnetic field distribution information for each spatial position of the electromagnetic field sensor 2.

  In addition, if a plurality of optical markers that emit light in different wavelength bands are attached to the electromagnetic field sensor 2, the electromagnetic field map generation unit 18 stores the position information and position information of the electromagnetic field strength measurement points for each type of light. A history can be obtained. For this reason, the position correction unit 19 can execute an error detection process for detecting an abnormal value based on the history of measurement points for infrared light, ultraviolet light, and visible light. Then, the position of the measurement point determined to be an abnormal value can be corrected based on the position of the normal electromagnetic field intensity measurement point obtained from the detection information of light in other wavelength bands.

  That is, correction processing that replaces the position of the measurement point detected as an abnormal value with the position of the measurement point based on the detection information of light in another wavelength band, or the position of the measurement point detected as an abnormal value and the light in the other wavelength band The position of the measurement point can be corrected by a correction process that weights and adds the position of the measurement point based on the detected information.

  Of course, not only the correction of the abnormal value but also the identification of the position of the measurement point itself may be performed by weighted addition of a plurality of positions based on the detection information of light in different wavelength bands and the calculation of the average value.

  In the electromagnetic field distribution measuring apparatus 1B having such a configuration, even when an object that generates infrared light or ultraviolet light exists in the measurement region of the electromagnetic field intensity, interference from invisible light from the object is not received. The spatial position of the electromagnetic field sensor 2 can be accurately obtained based on the light detection information. Even when both infrared light and ultraviolet light are generated in the electromagnetic field measurement region, the space of the electromagnetic field sensor 2 can be accurately determined based on the visible light detection information that can be identified by blinking or modulation. The position can be determined.

(Other embodiments)
Although specific embodiments have been described above, the described embodiments are merely examples, and do not limit the scope of the invention. The novel methods and apparatus described herein can be implemented in a variety of other ways. Various omissions, substitutions, and changes can be made in the method and apparatus described herein without departing from the spirit of the invention. The appended claims and their equivalents include such various forms and modifications as are encompassed by the scope and spirit of the invention.

1, 1A, 1B Electromagnetic field distribution measuring device 2 Electromagnetic field sensor 2A Body 2B Sensor unit 3 IR marker 4 CCD camera 5 IR detector 5A IR camera 5B ADC
5C Arithmetic device 5D Wireless transmission antenna 6 Guide sheet 7 Computer 8 Shim member 9 Arithmetic device 10 Storage device 11 Input device 12 Display device 13 Input / output terminal 14 Wireless reception antenna 15 Video information generating unit 16 Electromagnetic field distribution information generating unit 17 Screen information Generation unit 18 Electromagnetic field map generation unit 19 Position correction unit 20 Data interpolation unit 30 Connecting member 31 Slide mechanism 32 Memory 40 UV marker 41 Visible light marker 42 UV detector O Object

Claims (4)

An electromagnetic field sensor equipped with a first light source that emits invisible light composed of infrared light or ultraviolet light, and a second light source that emits blinking visible light or modulated visible light ;
A plurality of detectors for detecting the invisible light and the visible light from the first light source and the second light source ;
Detection information of the invisible light and the visible light in the plurality of detectors, the space of the electromagnetic field sensor based on the relative positional relationship between the electromagnetic field measured by the electromagnetic field sensor intensity and said plurality of detectors The three-dimensional electromagnetic field distribution information for each position is obtained , and the abnormal value of the position of the measurement point is determined based on the history of the measurement points of the electromagnetic field intensity obtained from the detection information of one of the invisible light and the visible light. Electromagnetic field distribution information generating means for detecting and correcting the position of the measurement point determined to be an abnormal value based on the position of the measurement point of the electromagnetic field intensity obtained from the other detection information ;
An electromagnetic field distribution measuring apparatus comprising:   An electromagnetic field sensor having a first light source that emits infrared light and a second light source that emits ultraviolet light; and
  A plurality of detectors for detecting the infrared light and ultraviolet light from the first light source and the second light source;
  The space of the electromagnetic field sensor based on the detection information of the infrared light and the ultraviolet light in the plurality of detectors, the electromagnetic field intensity measured by the electromagnetic field sensor, and the relative positional relationship between the plurality of detectors 3D electromagnetic field distribution information for each position is obtained, and an abnormal value of the position of the measurement point is determined based on the history of the measurement points of the electromagnetic field intensity obtained from the detection information of one of the infrared light and ultraviolet light. Electromagnetic field distribution information generating means for detecting and correcting the position of the measurement point determined to be an abnormal value based on the position of the measurement point of the electromagnetic field intensity obtained from the other detection information;
An electromagnetic field distribution measuring apparatus comprising:   The electromagnetic field intensity is measured using an electromagnetic field sensor equipped with a first light source that emits invisible light composed of infrared light or ultraviolet light and a second light source that emits blinking visible light or modulated visible light. Measure and
  Detecting the invisible light and the visible light with a plurality of detectors;
  Based on the detection information of the invisible light and the visible light in the plurality of detectors, the electromagnetic field intensity measured by the electromagnetic field sensor, and the relative positional relationship between the plurality of detectors. Obtain 3D electromagnetic field distribution information for each spatial position,
  Detecting an abnormal value of the position of the measurement point based on the history of the measurement point of the electromagnetic field intensity obtained from the detection information of one of the invisible light and the visible light,
  An electromagnetic field distribution measurement method for correcting the position of the measurement point determined to be an abnormal value based on the position of the measurement point of the electromagnetic field intensity obtained from the other detection information.   The electromagnetic field intensity is measured using an electromagnetic field sensor equipped with a first light source that emits infrared light and a second light source that emits ultraviolet light,
  Detecting the infrared light and ultraviolet light with a plurality of detectors;
  The space of the electromagnetic field sensor based on the detection information of the infrared light and the ultraviolet light in the plurality of detectors, the electromagnetic field intensity measured by the electromagnetic field sensor, and the relative positional relationship between the plurality of detectors Find 3D electromagnetic field distribution information for each position,
  Detecting an abnormal value of the position of the measurement point based on the history of the measurement point of the electromagnetic field intensity obtained from the detection information of one of the infrared light and ultraviolet light,
  An electromagnetic field distribution measurement method for correcting the position of the measurement point determined to be an abnormal value based on the position of the measurement point of the electromagnetic field intensity obtained from the other detection information.