JP7372962B2 - Parabolic antenna, sound source display device and sound source display method - Google Patents

Description

The present invention relates to a sound source display device, a sound source display method, and a parabolic antenna used in the sound source display device, which display the position of a sound source located at a remote location.

Various insulators are used in power receiving equipment and substation equipment in factories that handle high-voltage electricity. These insulators deteriorate due to the external environment or manufacturing problems, and as the deterioration progresses, the insulation parts short-circuit, causing these equipment to fail. Therefore, it is necessary to detect deteriorated insulators at an early stage and repair or replace the insulators.

When deterioration occurs in insulators used in power receiving equipment, substation equipment, etc., partial discharge, which is a localized minute discharge such as corona discharge or creeping discharge, occurs. When partial discharge occurs in an insulator, ultrasonic waves are emitted, so by detecting these ultrasonic waves, it is possible to detect degraded parts of the insulator.

Patent Document 1 discloses a device for detecting partial discharges, which includes a parabolic sound collector, a microphone array placed opposite to the sound collecting structure, and an object imaging device, and detects partial discharges with high sensitivity. A sound source detection device for detecting discharge sound is disclosed.

Japanese Unexamined Patent Publication No. 63-58182

The sound source detection device disclosed in Patent Document 1 uses a parabolic sound collector with high directivity, so it can only detect the presence or absence of a sound source in one area, and cannot detect the presence or absence of a sound source in a wide area, such as power receiving equipment or substation equipment installed over a wide area. The problem was that it was not suitable for searching for partial discharge locations in power equipment. The present invention has been made in view of the above problems, and its purpose is to provide a sound source display device, a sound source display method, and a parabola used in the sound source display device that can efficiently search for sound sources over a wider range than conventional devices. The purpose is to provide an antenna.

The means for solving the above problems are as follows.
(1) It has a reflective surface and a plurality of microphones arranged opposite to the reflective surface, and the reflective surface has a plurality of microphones that collect sound waves from a sound source in a specific direction at a specific position. A parabolic antenna including a parabolic curved surface, wherein the plurality of parabolic curved surfaces are different in the specific direction and the specific position, and the plurality of microphones are respectively provided at the specific positions.
(2) The parabolic surface according to (1), wherein the reflecting surface includes three or more and five or less parabolic curved surfaces that collect sound waves from three or more and five or less different sound sources in specific directions. antenna.
(3) The parabolic antenna according to (1) or (2), wherein the plurality of parabolic curved surfaces are arranged concentrically.
(4) Among the plurality of parabolic curved surfaces arranged concentrically, the parabolic curved surface arranged in the circumferential direction has the axis of the parabolic curved surface arranged in the center and the parabolic curved surface arranged in the circumferential direction. The parabolic antenna according to (3), which is arranged in a direction intersecting the axis.
(5) The specific position of the parabolic curved surface arranged in the circumferential direction among the plurality of concentrically arranged parabolic curved surfaces is on a side farther from the specific position of the parabolic curved surface arranged at the center. The parabolic antenna according to (3) or (4).
(6) Obtained by the parabolic antenna according to any one of (1) to (5), a camera that creates image data by photographing the measurement target in the direction in which the reflective surface faces, and the plurality of microphones. A sound source display device, comprising: a calculation means for creating superimposed image data from sound pressure data generated by the camera and image data generated by the camera; and a display means for displaying the superimposed image.
(7) The sound source display device according to (6), wherein the parabolic antenna is configured to be rotatable in the circumferential direction, and further includes a driving means for making the parabolic antenna rotatable in the circumferential direction.
(8) A sound source display method using the sound source display device described in (6), in which by moving the sound source display device in a vertical direction or a horizontal direction, the calculation means can A sound source display comprising acquiring sound pressure data, acquiring a plurality of image data from the camera, creating a superimposed image from the acquired plurality of sound pressure data and the plurality of image data, and displaying the superimposed image on the display means. Method.
(9) A sound source display method using the sound source display device according to (7), wherein the parabolic antenna is caused to reciprocate in the circumferential direction within a predetermined set angle range by the driving means, and the sound source is displayed. The device is moved vertically or horizontally, and the calculation means acquires a plurality of sound pressure data from the plurality of microphones, acquires a plurality of image data from the camera, and combines the acquired plurality of sound pressure data with the plurality of acquired sound pressure data. A sound source display method that creates a superimposed image from a plurality of image data and displays it on the display means.
(10) The sound source display method according to (8) or (9), wherein the calculation means creates a superimposed image of a panoramic image from a plurality of acquired sound pressure data and a plurality of image data.
(11) The sound source display method according to any one of (8) to (10), wherein the sound wave is an ultrasonic wave generated by partial discharge.

With the sound source display device and the sound source display method according to the present invention, the sound source can be searched for even if the location and direction of the sound source are not accurately known in advance, so the sound source can be searched for more efficiently than conventional devices. If the location of the sound source can be searched efficiently in this way, partial discharge points can be easily detected in power equipment such as power receiving equipment and substation equipment installed over a wide area using sound source display devices and sound source display methods. .

FIG. 1 is a schematic diagram showing a sound source display device 10 according to the present embodiment. FIG. 2 is a schematic diagram illustrating the positions of parabolic curved surfaces 23 to 27. FIG. 3 is a diagram illustrating sound collection positions of parabolic curved surfaces 23, 24, and 26. 3 is a graph showing the relationship between the sound wave arrival angle and the sound pressure measured by microphones 31, 33, and 35. 3 is a graph showing the relationship between the sound wave arrival angle and the sound pressure measured by microphones 31, 33, and 35. 1 is a functional block diagram of a sound source display device 10. FIG. 4 is a diagram showing an example of a superimposed image displayed on display means 42. FIG. FIG. 3 is a diagram illustrating a method of creating one superimposed image from a plurality of sound pressure data and a plurality of image data. FIG. 1 is a schematic diagram showing an example of a sound source display device 10 and a driving means according to the present embodiment. FIG. 2 is a schematic diagram showing another example of the sound source display device 10 and driving means according to the present embodiment.

Hereinafter, the present invention will be explained through embodiments of the invention. FIG. 1 is a schematic diagram showing a sound source display device 10 according to this embodiment. 1(a) is a front perspective view of the sound source display device 10, FIG. 1(b) is a rear perspective view of the sound source display device 10, and FIG. 1(c) is a sectional view of the sound source display device 10. be. First, the configuration of the sound source display device 10 according to this embodiment will be explained using FIGS. 1(a) to 1(c).

The sound source display device 10 according to this embodiment includes a parabolic antenna 20, a display means 42, an input means 44, and a calculation means 46. The parabolic antenna 20 has a reflecting surface 22, five microphones 31 to 35, a support plate 36 that arranges these five microphones 31 to 35 on a flat or curved surface to form an integrated module, and a camera 40. . The reflecting surface 22 collects sound waves including ultrasonic waves generated by partial discharge at different positions depending on the direction of the sound source. In the sound source display device 10 according to the present embodiment, the reflective surface 22 includes, for example, five parabolic curved surfaces 23 to 27 arranged concentrically.

FIG. 2 is a schematic diagram illustrating the positions of the parabolic curved surfaces 23 to 27. In FIG. 2(a), the circumferential centers of the four parabolic curved surfaces 24 to 27 provided on the circumferential surface of the reflective surface 22 are 0°, 90°, and 180° with the vertically upward direction being the reference (0°). , 270° is shown. FIG. 2(b) shows that the circumferential centers of the four parabolic curved surfaces 24 to 27 provided on the circumferential surface are 27°, 117°, 207°, and 297° with the vertically upward direction as the reference (0°). Here is an example of the arrangement. In the sound source display device 10 according to the present embodiment, as shown in FIG. 2(b), the four parabolic curved surfaces 24 to 27 provided on the circumferential surface have their centers set with the vertically upward direction as a reference (0°). , 27°, 117°, 207°, and 297°. Since the parabolic curved surfaces 23 to 27 have a curved shape that collects sound waves from a sound source in a specific direction determined by the directivity of each parabolic curved surface to a specific position, the parabolic curved surfaces 23 to 27 are By arranging the parabolic curved surfaces 23 to 27, the search areas for the sound source can be made different in the vertical and horizontal directions without overlapping each other, and the sound source can be detected by moving the parabolic surfaces 23 to 27 horizontally or vertically. When doing so, gaps in the search area can be reduced or eliminated.

Further, the parabolic antenna 20 can be rotated in the circumferential direction, for example, around an axis passing through the center of the parabolic antenna 20 and the center of the support plate 36 (hereinafter referred to as the central axis). It is more preferable to further include a drive means for reciprocating movement. The center of the support plate 36 is the center of the outer diameter of the support plate 36, and is determined by design. Further, the center of the parabolic antenna 20 is the center of the outer diameter of the parabolic antenna 20, or the center when the parabolic curved surfaces 23, 24, 25, 26, and 27 are arranged concentrically, and is determined by design. In this embodiment, the sound source is detected by moving the parabolic antenna 20 horizontally, vertically, or both directions while reciprocating the parabolic antenna 20 in the circumferential direction using the central axis as the rotation center axis by the driving means. is configured to do so. By doing this, even when a gap in the sound source search area occurs between the parabolic curved surfaces 23 to 27 in the circumferential direction, the sound source can be searched for while filling the gap. As a result, the sound source position can be specified more precisely.

For example, while the parabolic antenna 20 is vibrated back and forth by ±4 degrees in the θ direction (circumferential direction around the center of the parabolic antenna 20) about twice every second, the sound source display device 10 is moved horizontally, vertically, or both. Move in the direction to search for the source of the sound. Then, by placing a point at the angular position where the maximum sound pressure occurs, the position can be determined more precisely.

FIG. 9 is a schematic diagram showing an example of the sound source display device 10 and driving means according to the present embodiment. In the example shown in FIG. 9, a parabolic antenna 20 is arranged inside a gutter-shaped frame that opens upward in the vertical direction of the sound source display device 10, and a parabolic antenna 20 is placed on the opposite side of the reflecting surface 22 of the parabolic antenna 20. A driving means 101 is provided on the back surface of the antenna 20. The driving means 101 includes, for example, a motor such as a stepping motor or a servo motor that can control the rotation angle as appropriate. A parabolic antenna 20 is connected to the rotor shaft of the motor. Note that a speed change mechanism may be provided between the motor and the parabolic antenna 20 to increase or decrease the output torque of the motor.

The driving means 101 is fixed to the inner bottom surface of the frame via a support part 102, and the frame is rotatably attached to a mount 103 that is a base or structural part that supports the sound source display device 10. A vertical movement mechanism 104 that changes the orientation of the parabolic antenna 20 in the vertical direction is provided at the upper part of the support part 102. The vertical movement mechanism 104 is configured to rotate with a rotation center axis in a direction substantially orthogonal to the vertical direction of the sound source display device 10. Further, the vertical movement mechanism 104 may include a stepping motor, a servo motor, or the like, and may be configured to change the orientation of the parabolic antenna 20 in the vertical direction by controlling the rotation angle of the motor. Alternatively, the configuration is such that the orientation of the parabolic antenna 20 with respect to the measurement target in the vertical direction is maintained by a frictional force, and the vertical orientation of the parabolic antenna 20 is changed by applying a load exceeding the frictional force to the parabolic antenna 20. You can leave it there.

A left-right rotation mechanism 105 is provided inside the mount 103 to rotate the sound source display device 10 left and right about an axis substantially parallel to the up-down direction. The left/right rotation mechanism 105 includes a stepping motor, a servo motor, or the like, and controls the rotation angle and torque of the motor to rotate the parabolic antenna 20 left and right about an axis substantially parallel to the vertical direction. . Note that a linear slider (not shown) may be provided between the mount 103 and a fixed part (not shown), such as a floor, for moving the sound source display device 10 substantially parallel to the fixed part. At this time, the left-right rotation mechanism 105 may not be provided inside the mount 103, or may be provided. In short, it is sufficient if the sound source search direction can be moved horizontally. That is, the sound source display device 10 may be configured to move the sound source search direction in the horizontal direction by rotating the parabolic antenna 20 in the horizontal direction using the left-right rotation mechanism 105, or the direction of the parabolic antenna 20 may be changed. Instead, the whole parabolic antenna 20 may be horizontally moved along the fixed part using a linear slider to move the sound source search direction. Alternatively, the left/right rotation mechanism 105 and a linear slider may be combined to move the sound source search direction in the horizontal direction.

Although not shown in detail, a height adjustment mechanism for changing the position of the parabolic antenna 20 in the vertical direction may be provided on the support portion 102 or the mount 103. The height adjustment mechanism only needs to be configured to be able to change the position of the parabolic antenna 20 in the vertical direction, and may be a conventionally known lifting device. For example, it may be a lifting device using a rack and pinion, a hydraulic actuator, or the like. At this time, the vertical movement mechanism 104 may not be provided at the upper part of the support part 102, or may be provided. In short, it is sufficient if the search direction of the sound source can be moved in the vertical direction. That is, the sound source display device 10 may be configured to move the sound source search direction in the vertical direction by vertically rotating the parabolic antenna 20 by the vertical movement mechanism 104, or by changing the direction of the parabolic antenna 20. The parabolic antenna 20 may be configured to move in the sound source search direction by vertically moving the entire parabolic antenna 20 using the height adjustment mechanism without changing the height adjustment mechanism. Alternatively, the vertical movement mechanism 104 and the height adjustment mechanism may be combined to move the sound source search direction in the vertical direction. Since the other configurations are the same as those shown in FIG. 1 or 2, the same components as those shown in FIG. 1 or 2 will be given the same reference numerals as in FIG. .

Therefore, according to the configuration shown in FIG. 9, even if a gap occurs between the search areas corresponding to the parabolic curved surfaces 23, 24, 25, 26, and 27, the parabolic antenna 20 can be moved in the circumferential direction as described above. Since the reciprocating motion is performed, the above-mentioned gap in the circumferential direction can be made as small as possible or eliminated. Further, while the parabolic antenna 20 is reciprocating in the circumferential direction, the sound source display device 10 is moved in the direction along the fixed part, that is, in the horizontal direction, or in the vertical direction, that is, in the vertical direction of the sound source display device 10, or in both directions. let Therefore, a wide area can be searched without gaps. Furthermore, in this embodiment, the vertical angle, so-called elevation angle, of the parabolic antenna 20 with respect to the horizontal plane when the sound pressure of the detected sound wave reaches the maximum, and the vertical angle of the parabolic antenna 20 from a preset reference position to the horizontal direction. The partial discharge location is specified based on the rotation angle and the position information of the parabolic antenna 20 in the horizontal direction, the vertical direction, or both directions with respect to the fixed part. Therefore, the accuracy of identifying partial discharge locations can be improved.

FIG. 10 is a schematic diagram showing another example of the sound source display device 10 and drive means in which the parabolic antenna 20 according to the present embodiment can be rotated in the circumferential direction. The example shown here is an example in which the parabolic antenna 20 is configured to reciprocate in the circumferential direction by a driving means 101 using a rack and pinion. As shown in FIG. 10, a pinion gear 106 is integrally provided on the back surface of the parabolic antenna 20, and a rack 107 that meshes with the pinion gear 106 is provided extending in the vertical direction of the sound source display device 10. The pinion gear 106 is rotatably supported by the support portion 102 via a bearing 108. The rack 107 is configured to be movable in the vertical direction by a motor, a hydraulic actuator, or the like (not shown). By increasing or decreasing the rotation angle of the motor or the amount of drive of the actuator, the amount of movement of the rack 107 in the vertical direction is increased or decreased, thereby reciprocating the parabolic antenna 20 in the circumferential direction. Since the other configurations are the same as those shown in FIG. 9, the same components as those shown in FIG. 9 are given the same reference numerals as those in FIG. 9, and the description thereof will be omitted.

Even in the configuration shown in FIG. 10, while the parabolic antenna 20 is reciprocating in the circumferential direction, the sound source display device 10 is moved horizontally, vertically, or both directions. can be done. Therefore, even with the configuration shown in FIG. 10, the same operation and effect as the configuration shown in FIG. 9 can be obtained.

Referring again to FIG. Each of the parabolic curved surfaces 23 to 27 collects sound waves at different positions depending on the direction of the sound source. The parabolic curved surface 23 collects the sound waves emitted from the sound source to the microphone 31, and the parabolic curved surface 24 collects the sound waves emitted from the sound source to the microphone 33. Further, the parabolic curved surface 25 collects the sound waves emitted from the sound source to the microphone 34, the parabolic curved surface 26 collects the sound waves emitted from the sound source to the microphone 35, and the parabolic curved surface 27 collects the sound waves emitted from the sound source to the microphone 34. The emitted sound waves are collected into a microphone 32.

The five microphones 31 to 35 are arranged on the side of the support plate 36 facing the reflective surface 22. The five microphones 31 to 35 are arranged with one microphone in the center, and the other microphones 32 to 35 are arranged at positions corresponding to the positions where the parabolic curved surfaces 24 to 27 are provided so as to surround the central microphone 31.

FIG. 3 is a diagram illustrating sound collection positions of the parabolic curved surfaces 23, 24, and 26. In Fig. 3(a), the axes of the parabolic curved surfaces 24 and 26 provided on the circumferential surface are directed outward so that they do not intersect with the axis of the central parabolic curved surface, and the sound is collected into a nearby microphone. Fig. 3(b) shows an example in which the axes of the parabolic curved surfaces 24 and 26 are directed inward so that they intersect with the axis of the central parabolic curved surface, and the sound is collected to a distant microphone. shows.

4 and 5 are graphs showing the relationship between the sound wave arrival angle and the sound pressure measured by the microphones 31, 33, and 35. FIG. 4 shows a graph when using a parabolic antenna configured as shown in FIG. 3(a), and FIG. 5 shows a graph when using a parabolic antenna configured as shown in FIG. 3(b). show. The experimental conditions in FIGS. 4 and 5 are all the same except for the differences in the configurations shown in FIGS. 3(a) and 3(b).

Comparing FIGS. 4 and 5, the overall measured sound pressure was higher in FIG. 5 than in FIG. 4. From this result, it can be seen that by configuring the parabolic curved surfaces 24 and 26 to collect sound to a distant microphone, the sensitivity of the sound pressure measurement of the parabolic antenna is increased. By making the axis of the parabolic curved surface inward and increasing the focal distance from the parabolic curved surface to the focal point, the projected area of the parabolic curved surfaces 24 and 26 projected in the direction in which the sound waves arrive can be increased. By increasing the projected area, the parabolic curved surface is able to collect more sound waves, which is thought to increase the sensitivity of the parabolic antenna's sound pressure measurement.

Therefore, as shown in FIG. 3(b), the parabolic curved surfaces 24 to 27 provided in the circumferential direction of the reflective surface 22 according to the present embodiment are located far away from the respective parabolic curved surfaces among the microphones 32 to 35. Sound waves are collected into a microphone located at a certain location. It is preferable to have the microphone at a distant position collect sound waves in this manner, and the sensitivity of sound pressure measurement using a parabolic curved surface can be increased more than when the sound wave is collected by a microphone at a close position.

Referring again to FIG. The microphones 31 to 35 measure the sound pressure of the sound waves collected by the corresponding parabolic curved surfaces and output the sound pressure data to the calculation means 46.

The camera 40 images the measurement target in the direction toward which the reflective surface 22 faces at predetermined time intervals, and generates image data. The camera 40 outputs the image data to the calculation means 46. The magnification, field of view, etc. of the camera 40 are determined in advance so that the size of the entire exploration area of each parabolic curved surface 23 to 27 corresponds to the size of the measurement target photographed by the camera 40. .

Upon receiving an instruction from the user to create a superimposed image, the calculation means 46 adds sound pressure data to the image data using the sound pressure information acquired from the microphones 31 to 35 and the image data acquired from the camera 40. Create superimposed image data.

The display means 42 is, for example, an LCD, and displays the superimposed image created by the calculation means 46. The input means 44 is, for example, a push switch, and a plurality of input means 44 are provided below the display means 42. By pressing the input means 44, the user inputs a predetermined input signal to the calculation means 46. Note that the input means 44 may be a touch panel type input device, and in this case, the input means 44 may not be provided.

FIG. 6 is a functional block diagram of the sound source display device 10. A method for creating a superimposed image by the calculation means 46 will be explained using FIG. 6. The calculation means 46 includes an image processing section 48 and a storage section 49. The image processing unit 48 is, for example, a CPU, and uses programs and data stored in the storage unit 49 to control the operation of the sound source display device 10 and execute predetermined calculations. The storage unit 49 is, for example, an information recording medium such as an update-recordable flash memory, a built-in memory card, or a memory card connected through a data communication terminal, and a read/write device thereof. The storage unit 49 stores in advance programs for realizing various functions of the sound source display device 10, data used during execution of the programs, and the like.

Upon receiving an instruction to create a superimposed image from the user, the image processing unit 48 acquires sound pressure data from the microphones 31 to 35 and image data from the camera 40. The image processing unit 48 calculates the intensity of the sound pressure data acquired from the microphones 31 to 35. Further, the image processing unit 48 reads out a table that associates the sound source searched areas on the parabolic curved surfaces 23 to 27 with the data areas in the acquired image data from the storage unit 49, and uses the table to calculate the sound pressure. The data area of the image data from which the data was acquired is specified, and the area is colored in accordance with the sound pressure intensity of the sound pressure data. For example, when the sound pressure intensity is low, it is colored lightly, and when the sound pressure intensity is high, it is colored darkly. In this way, the image processing unit 48 creates superimposed image data. The image processing section 48 displays the created superimposed image data on the display means 42. Note that a table for associating regions in which sound sources are searched on the parabolic curved surfaces 23 to 27 with data regions in the image data is stored in the storage unit 49 in advance.

FIG. 7 is a diagram showing an example of a superimposed image displayed on the display means 42. In FIG. 7, regions 70 to 78 in which sound sources have been searched are indicated by dotted lines. The region 70 is a region where sound waves are measured by the parabolic curved surface 23, the region 72 is a region where the sound source is searched by the parabolic curved surface 24, and the region 74 is a region where the sound source is searched by the parabolic curved surface 25. The area 76 is an area where a sound source is searched by the parabolic curved surface 26, and the area 78 is an area where a sound source is searched by the parabolic curved surface 27.

For example, if a partial discharge occurs in the equipment at a position corresponding to the area 78, the sound pressure intensity at the position corresponding to the area 78 will increase due to the ultrasonic waves generated by the partial discharge, so that the sound pressure intensity at the position corresponding to the area 78 will be displayed on the display means 42. In the superimposed image, region 78 is shown colored. Therefore, a user who visually recognizes the superimposed image can easily recognize that partial discharge has occurred in the colored region 78, and can detect a deteriorated part of the insulator by investigating the position.

In this way, the sound source display device 10 according to the present embodiment uses a parabolic antenna having five parabolic curved surfaces 23 to 27, so that five search areas corresponding to the five parabolic curved surfaces 23 to 27 can be searched at distant locations. You can search for partial discharge locations. Therefore, the sound source display device 10 according to the present embodiment has a parabolic antenna configured with one parabolic curved surface, and can search a wider range than a conventional device that can search for a partial discharge location only in one search area. You can search for sound sources efficiently. In this embodiment, an example was shown in which the reflecting surface 22 of the parabolic antenna 20 includes five parabolic curved surfaces 23 to 27, but the present invention is not limited to this. The reflective surface 22 only needs to include a plurality of parabolic curved surfaces, thereby providing a sound source display device that can search for a sound source more efficiently than conventional devices.

On the other hand, the superimposed image shown in FIG. 7 includes an area where the sound source has not been detected. Therefore, by moving the sound source display device 10 in the vertical direction, horizontal direction, or both directions, a plurality of sound pressure data at different positions can be obtained from the parabolic antenna 20, and a plurality of image data can be obtained from the camera 40. It is preferable to create a superimposed image from these plural pieces of sound pressure information and plural image data.

FIG. 8 is a diagram illustrating a method of creating one superimposed image from a plurality of sound pressure data and a plurality of image data. First, upon receiving an instruction from the user to obtain a superimposed image, the image processing unit 48 obtains sound pressure data and image data from the microphones 31 to 35 and the camera 40, and creates one superimposed image data 60 ( 1st page). FIG. 8(a) shows this superimposed image. In FIG. 8, the area indicated by the dotted line indicates the area where the sound source was searched by the parabolic curved surfaces 23 to 27.

Thereafter, the sound source display device 10 is moved horizontally at a predetermined speed. The image processing unit 48 acquires sound pressure data and image data from the microphones 31 to 35 and the camera 40 at predetermined intervals. This predetermined interval is determined based on the moving speed of the sound source display device 10 and the size of the area in which the sound waves can be measured in the image data so that there is no gap in the area where the sound source is searched by the parabolic curved surfaces 23 to 27. determined. Therefore, it is preferable to move the sound source display device 10 using a drive device that can move the sound source display device 10 at a constant speed.

The image processing unit 48 acquires sound pressure data and image data from the microphones 31 to 35 and the camera 40, and creates superimposed image data 62 (second image). For example, the image processing unit 48 may perform pattern matching with the previously acquired image data by using a part (for example, the left end part) of the previously acquired image as a reference image among the later acquired image data. Then, the position of the reference image in the previously created superimposed image is specified. The image processing unit 48 combines the previously created image data and the later created superimposed image data at the position of the specified reference image. FIG. 8(b) shows this synthesized superimposed image.

This operation is repeated until there is no region in one image data in which no sound source has been searched. In the example shown in FIG. 8, by combining nine superimposed images, one superimposed image in which the sound source has been searched for in all regions can be obtained. FIG. 8(c) shows nine superimposed images, and FIG. 8(d) shows a superimposed image 64 in which sound sources have been searched for in all regions. In this way, superimposed images in which sound sources have been searched for in all regions can be synthesized. Note that in FIG. 8(d), a shaded area 80 indicates a region where the intensity of the measured sound pressure is high.

In addition, in this embodiment, an example was shown in which the sound source display device 10 is moved in the horizontal direction to create a superimposed image in which the sound source is searched for in all areas, but the present invention is not limited to this. The direction may be vertical. In the parabolic antenna 20 according to this embodiment, the parabolic curved surfaces 23 to 27 are arranged at predetermined positions so that the regions in which the sound source is searched are different from each other so that they do not overlap in the vertical direction and the horizontal direction. As a result, by moving the sound source display device 10 vertically or horizontally to acquire multiple sound pressure data and multiple image data, image data in which the sound source is searched for in all areas without gaps is created and displayed. It becomes a device that can.

Furthermore, although the example shown in FIG. 8 shows an example in which image data having the same size as the image data acquired by the camera 40 is combined, the present invention is not limited to this. For example, when moving the display means 42 in the horizontal direction, image data and sound pressure data are further acquired, panoramic image data in which the sound source position has been searched in all areas is synthesized, and the panoramic image is displayed on the display means 42. may be displayed.

Furthermore, in this embodiment, an example is shown in which the five parabolic curved surfaces 23 to 27 are arranged so that the areas in which the sound sources of the five parabolic curved surfaces 23 to 27 are searched do not overlap in the vertical and horizontal directions. It is not limited to this. Each of the parabolic curved surfaces 23 to 27 may be arranged such that the sound sources of the five parabolic curved surfaces 23 to 27 are searched for at different positions without overlapping in at least one of the horizontal and vertical directions. In addition, the number of parabolic curved surfaces is preferably 3 or more and 5 or less. For example, when the number of parabolic curved surfaces is 3, the centers of the three parabolic curved surfaces are vertically upward (0°). The parabolic curved surfaces may be arranged at angles of 30°, 150°, and 270°.

Further, although an example has been shown in which the five parabolic curved surfaces 23 to 27 are arranged so that the sound sources of the five parabolic curved surfaces 23 to 27 are searched for without gaps in the vertical and horizontal directions, the present invention is not limited to this. . The parabolic antenna 20 is further provided with driving means for reciprocating the parabolic antenna 20 in the circumferential direction about a line connecting the center of the parabolic antenna 20 and the center of the support plate 36, and the driving means moves the parabolic antenna 20 to the center of the parabolic antenna 20. If the sound source is detected by moving it in the horizontal or vertical direction while reciprocating in the circumferential direction about the line connected to the center of the support plate 36, a gap in the sound source search area will be created between the parabolic curved surfaces 23 to 27. You can search for the source of the sound while filling in the gaps. As a result, the sound source position can be specified more precisely.

For example, while the parabolic antenna 20 is vibrated back and forth by ±4 degrees in the θ direction (circumferential direction around the line connecting the center of the parabolic antenna 20 and the center of the support plate 36) about twice per second, the sound source display device 10 in the horizontal or vertical direction to search for the sound source. Then, by placing a point at the angular position where the maximum sound pressure occurs, the position can be determined more precisely. In this embodiment, instead of reciprocating the parabolic antenna 20 in the circumferential direction, the parabolic antenna 20 is rotated continuously in one direction in the circumferential direction, or rotated in one direction by a predetermined angle. It may be configured as follows. In short, it is sufficient that the parabolic antenna 20 is rotated in the circumferential direction by the driving means 101 to reduce the circumferential gap described above.

Partial discharges such as corona discharges that occur in the insulators of power receiving equipment and substation equipment occur at specific times in the AC power cycle. Therefore, frequency components that are integral multiples of the AC power cycle in the frequency spectrum calculated by envelope processing and frequency analysis of the sound pressure data measured by the microphone are considered to be due to partial discharge. Therefore, the ratio of the sum of the intensities of frequency components that are integral multiples of the AC power cycle to the total intensity of the frequency spectrum is the ratio of the partial discharge component to the intensity of all the components of the frequency spectrum, that is, the ratio of the sum of the intensities of the frequency components that are integral multiples of the AC power cycle It shows the contribution rate of the discharge component to the sound pressure.

The image processing unit 48 performs envelope processing and frequency analysis (fast Fourier transform) on the sound pressure data acquired by the microphones 31 to 35 to calculate a frequency spectrum in the range of, for example, 0 to 300 Hz. The image processing unit 48 calculates the ratio of the sum of the intensities of frequency components that are integral multiples of the power supply frequency to the total intensity of the frequency spectrum, and displays the ratio together with the area where the sound pressure intensity is high in the superimposed image. You may let them. Thereby, the user can easily determine whether what is occurring in the high sound pressure region shown in the superimposed image is partial discharge, leak sound, or noise sound.

10 sound source display device 20 parabolic antenna 22 reflective surface 23 parabolic curved surface 24 parabolic curved surface 25 parabolic curved surface 26 parabolic curved surface 27 parabolic curved surface 31 microphone 32 microphone 33 microphone 34 microphone 35 microphone 36 support plate 40 camera 42 display means 44 input Means 46 Calculating means 48 Image processing unit 49 Storage unit 60 Image data 62 Image data 64 Superimposed image 70 Area 72 Area 74 Area 76 Area 78 Area 80 Shaded area

Claims (12)

comprising a reflective surface and a plurality of microphones arranged opposite to the reflective surface,
The reflecting surface includes a plurality of parabolic curved surfaces that collect sound waves from a sound source in a specific direction at a specific position,
The plurality of parabolic curved surfaces are different in the specific direction and the specific position,
The plurality of microphones are each provided at the specific position,
A parabolic antenna in which the plurality of parabolic curved surfaces are arranged concentrically. comprising a reflective surface and a plurality of microphones arranged opposite to the reflective surface,
The reflecting surface includes a plurality of parabolic curved surfaces that collect sound waves from a sound source in a specific direction at a specific position,
The plurality of parabolic curved surfaces are different in the specific direction and the specific position,
The plurality of microphones are each provided at the specific position,
A parabolic antenna, wherein a plurality of the parabolic curved surfaces are arranged in one of the reflecting surfaces. The reflective surface includes three to five parabolic curved surfaces that collect sound waves from three to five different sound sources in specific directions, respectively. parabolic antenna. The parabolic antenna according to claim 2, wherein the plurality of parabolic curved surfaces are arranged concentrically. Among the plurality of concentrically arranged parabolic curved surfaces, the parabolic curved surface arranged in the circumferential direction is such that the axis of the parabolic curved surface arranged at the center and the axis of the parabolic curved surface arranged in the circumferential direction are The parabolic antenna according to claim 1 or 4, wherein the parabolic antenna is arranged in intersecting directions. The specific position of the parabolic curved surface arranged in the circumferential direction among the plurality of concentrically arranged parabolic curved surfaces is on a side farther from the specific position of the parabolic curved surface arranged at the center, The parabolic antenna according to claim 1 or 4 or 5. A parabolic antenna according to any one of claims 1 to 6,
a camera that creates image data by photographing the measurement target in the direction in which the reflective surface faces;
calculation means for creating superimposed image data from sound pressure data acquired by the plurality of microphones and image data generated by the camera;
Display means for displaying the superimposed image;
A sound source display device having: The parabolic antenna is configured to be rotatable in a circumferential direction,
The sound source display device according to claim 7, further comprising a drive means for making the parabolic antenna rotatable in a circumferential direction. A sound source display method using the sound source display device according to claim 7,
By moving the sound source display device vertically or horizontally, the calculation means acquires a plurality of sound pressure data from the plurality of microphones, and acquires a plurality of image data from the camera, and the acquired plurality of image data. A sound source display method, comprising: creating a superimposed image from sound pressure data and a plurality of image data, and displaying the superimposed image on the display means. A sound source display method using the sound source display device according to claim 8,
reciprocating the parabolic antenna in the circumferential direction within a predetermined set angle range by the driving means, and moving the sound source display device in the vertical or horizontal direction;
The calculation means acquires a plurality of sound pressure data from the plurality of microphones, acquires a plurality of image data from the camera, and creates a superimposed image from the acquired plurality of sound pressure data and the plurality of image data. and displaying the sound source on the display means. 11. The sound source display method according to claim 9, wherein the calculation means creates a superimposed panoramic image from the plurality of acquired sound pressure data and the plurality of image data. 12. The sound source display method according to claim 9, wherein the sound waves are ultrasonic waves generated by partial discharge.

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