Contact wire wear measurement method and measurement system

Abstract

To provide a measurement method and a measurement system which can measure the cross-sectional shape of a trolley wire more surely and accurately by means of an optical cutting method.SOLUTION: A measurement method of a cross-sectional shape of a trolley wire comprises: an irradiation step of emitting a slit-like laser light flux to a trolley wire with an optical axis facing upward in a vertical plane substantially vertical to the direction in which a track extends; and an imaging step of imaging an emission line formed along a portion of a circumference on a cutting surface of the trolley wire in the vertical plane. The irradiation step emits the laser light flux toward an abrasion part of the trolley wire and a V groove part of a side part of the trolley wire. The imaging step images the emission line corresponding to each of the abrasion part and the V groove part. A measurement system includes an irradiation device, an imaging device and an analysis device. The irradiation device is arranged so as to emit the laser light flux toward the abrasion part of the trolley wire and the V groove part of the side part of the trolley wire. The imaging device is arranged so as to image the emission line corresponding to each of the abrasion part and the V groove part.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to a method and device for measuring the cross-sectional shape of a contact wire that supplies power to a railway vehicle running on a track, and more particularly to a method and system for measuring the cross-sectional shape of a contact wire from an image captured by an imaging device. [Background technology]

[0002] One method for measuring the cross-sectional shape of a contact wire that supplies power to a railway vehicle running on a track is the so-called "light section method," in which a slit-shaped light is emitted from a light source, the image is captured by an imaging device, and the cross-sectional shape is measured by image analysis. With this method, a light source and an imaging device are installed on the ceiling of the vehicle, and the cross-sectional shape of the contact wire can be measured from above the vehicle as it moves, allowing the wear state of the contact wire to be determined.

[0003] For example, Patent Document 1 discloses a method for measuring the wear of a trolley wire by image analysis, in which the cross-sectional shape of the trolley wire obtained by the light-section method is superimposed on the cross-sectional shape of a known new trolley wire. Specifically, the method uses image analysis to identify a worn area and an arc-shaped area from a part of the outline of the cross-section of the trolley wire, which is captured by irradiating a slit-shaped light from a light source directly below the trolley wire. Then, a virtual circle with the same diameter as the new trolley wire is superimposed on the arc-shaped area from the coordinate positions of two points included in the arc-shaped area, and the remaining diameter of the trolley wire is calculated from the length of the line segment from the top end of the virtual circle through the center of the virtual circle to the worn area, thereby determining the wear state. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-164068 Summary of the Invention [Problem to be solved by the invention]

[0005] In the above-described optical section method, the wear state is determined by distinguishing between the arc region and the wear region of the contact wire. However, if the wear region is entirely or partially inclined with respect to the horizontal line, part of the wear region is likely to be mistakenly recognized as the arc region. Furthermore, if the wear region expands significantly, the arc region becomes smaller, making it difficult to distinguish the arc region. As a result, the recognition of the cross-sectional shape of the contact wire becomes inaccurate.

[0006] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a measurement method and a measurement system that can measure the cross-sectional shape of a contact wire more reliably and accurately by the light section method. [Means for solving the problem]

[0007] A measurement method according to the present invention is a method for measuring the cross-sectional shape of a trolley wire that supplies power to a railway vehicle running on a track, and includes an irradiation step of directing a laser beam of light in a slit shape onto the trolley wire with an optical axis directed upward in a vertical plane approximately perpendicular to the direction in which the track extends, and an imaging step of imaging a bright line formed along a portion of the circumferential line of the cut surface of the trolley wire in the vertical plane, wherein the irradiation step is characterized in that the laser beam is directed toward a worn portion of the trolley wire and a V-groove portion on the side of the trolley wire, and the imaging step images the bright lines corresponding to each of the worn portion and the V-groove portion.

[0008] According to this feature, the amount of wear can be measured based on the V-groove portion, which is a non-wear portion, and in particular, even when wear has progressed, the cross-sectional shape of the trolley wire can be measured more reliably and accurately using the optical cutting method.

[0009] In the above-described invention, the bright lines corresponding to the wear portion and the V-groove portion may be imaged independently and separately. The imaging step may also be characterized by imaging an intersection between the arc portion and the V-groove portion on the cut surface of the trolley wire. The invention may further include a calculation step of determining the amount of wear of the trolley wire by image analysis, and the calculation step may include a step of determining the center of the trolley wire from both ends of the wear portion and the intersection on the cut surface. According to this feature, the amount of wear can be reliably and accurately measured based on the V-groove portion, which is a non-wear portion. Therefore, even when wear has progressed, the cross-sectional shape of the trolley wire can be measured more reliably and accurately by the light-section method.

[0010] In the above-described invention, the image analysis may include a comparing step of superimposing a known trolley wire cross-sectional line on the bright line. Furthermore, the comparing step may superimpose a known trolley wire cross-sectional line on the bright lines corresponding to the arc portions and the intersections. Furthermore, the bright lines on the arc portions may be due to the arc portions above the V-groove portions. According to this feature, the amount of wear can be measured based on the V-groove portion, which is a non-wear portion, and the cross-sectional shape of the trolley wire can be measured more reliably and accurately by the light-section method, especially even when wear has progressed.

[0011] In the above invention, the image analysis may include a step of calculating an equivalent residual diameter from the residual cross-sectional area. According to this feature, the cross-sectional shape of the contact wire can be measured accurately and simply.

[0012] The measurement system according to the present invention is a measurement system for the cross-sectional shape of a trolley wire that supplies power to railway vehicles running on a track, and includes an irradiation device that directs a laser beam in a slit shape onto the trolley wire with its optical axis directed upward in a vertical plane approximately perpendicular to the direction in which the track extends, an imaging device that images a bright line formed along a portion of the circumferential line of the cut surface of the trolley wire in the vertical plane, and an analysis device that determines the amount of wear of the trolley wire by image analysis, wherein the irradiation device is positioned to apply the laser beam toward the worn portion of the trolley wire and the V-groove portion on the side of the trolley wire, and the imaging device is positioned to image the bright lines corresponding to each of the worn portion and the V-groove portion.

[0013] According to this feature, the amount of wear can be measured based on the V-groove portion, which is a non-wear portion, and in particular, even when wear has progressed, the cross-sectional shape of the trolley wire can be measured more reliably and accurately using the optical cutting method.

[0014] In the above-described invention, the imaging device may be arranged to capture images of the bright lines corresponding to the worn portion and the V-groove portion separately and at a distance from each other. The irradiation device may also be arranged to be located to the side of the trolley wire on the ceiling of the railway car. According to this feature, the amount of wear can be reliably and accurately measured based on the V-groove portion, which is a non-wear portion, and the cross-sectional shape of the trolley wire can be measured more reliably and accurately by the light-section method, even when wear has progressed. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a side view (partially a block diagram) of an embodiment of a contact wire cross-sectional shape measurement system according to the present invention; [Figure 2] FIG. 2 is a front view of the main part of the measurement system. [Figure 3] FIG. 2 is a cross-sectional view showing a cross section of the trolley wire cut by a vertical plane. [Figure 4] FIG. 2 is a front view of another main part of the measurement system. [Figure 5] FIG. 1 is a flow chart of an embodiment of a method for measuring the cross-sectional shape of a trolley wire according to the present invention. [Figure 6] FIG. 2 is a flow chart of the main part of the method. [Figure 7] This is an image containing pixels corresponding to the captured bright lines. [Figure 8] FIG. 10 is an explanatory diagram of pixels extracted from a pixel group corresponding to a bright line. [Figure 9] FIG. 1 is a diagram of the circumferential line in a cross section of a contact wire in a vertical plane. [Figure 10] FIG. 1 is a diagram of the circumferential line in a cross section of a contact wire in a vertical plane. [Figure 11] FIG. 1 is a diagram showing a conventional contact wire cross section and a known contact wire cross section in the present embodiment, both of which are superimposed on each other. [Figure 12] 10A and 10B are graphs showing the residual diameter error of a 170 mm2 contact wire for (a) an example and (b) a comparative example. [Figure 13] 10A and 10B are graphs showing the residual diameter error of a 110 mm2 contact wire for (a) an example and (b) a comparative example. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, an embodiment of the method and system for measuring the cross-sectional shape of a contact wire according to the present invention will be described. First, the measurement system will be described with reference to FIGS.

[0017] As shown in Figure 1, the trolley wire cross-sectional shape measurement system 1 includes an irradiation device 2 that irradiates a laser beam L onto a trolley wire 20 arranged along a track on which a vehicle 10 (railroad vehicle) runs, an imaging device 3 that captures an image of the bright line formed by the laser beam irradiated onto the trolley wire 20, an irradiation control device 4 that controls the lighting operation of the irradiation device 2, and an analysis device 5 that analyzes the image captured by the imaging device 3. The irradiation device 2 and the imaging device 3 are installed on the vehicle 10. In this example, the irradiation device 2 and the imaging device 3 are installed on a mounting base 11 installed on the ceiling 12 of the vehicle 10. A pantograph 14 is also provided on the ceiling 12, and its contact strip 14a can be brought into contact with the underside of the trolley wire 20 to supply power to the vehicle 10 running on the track.

[0018] In particular, the irradiation device 2 directs the optical axis of the irradiated laser beam upward and provides a slit-shaped laser beam within a vertical plane S that is approximately perpendicular to the direction in which the track extends. That is, the irradiation device 2 is arranged so that the optical axis of the laser beam is located within the vertical plane S. Furthermore, the irradiation device 2 is further arranged on either the left or right side of the vehicle 10 so as to be located to the side of the trolley wire 20, and is arranged so that the optical axis A is tilted inward. This allows the irradiation device 2 to project the laser beam toward the side of the trolley wire 20, and in particular, to irradiate the inside of a V-groove portion 21 (see FIG. 3 ) of the trolley wire 20, as described below. For example, the irradiation device 2 is preferably arranged at a high position so that the optical axis can be tilted significantly (approximately 30 degrees) from the vertical direction and projected toward the trolley wire 20; in this example, the irradiation device 2 is installed on an inclined pedestal 13. Note that multiple irradiation devices 2 may be arranged in parallel, and each may be individually controlled to be turned on and off.

[0019] As shown in Figure 3, the trolley wire 20 is a wire rod with a substantially circular cross section, and is provided with a pair of V-groove portions 21 on the left and right sides, extending in the longitudinal direction. The trolley wire 20 is suspended on the track with the V-groove portions 21 clamped between the fixtures 16 (see Figure 1). A worn portion 25 that is substantially flat is formed on the lower portion of the trolley wire 20 due to sliding movement with the contact strip 14a. The laser beam L projected upward from above the vehicle 10 is irradiated from below the trolley wire 20 onto at least the entire width of the worn portion 25, and is also irradiated onto a part of the lower arc portion 24 that continues below the V-groove portion 21.

[0020] As described above, the irradiation device 2 is configured to project a laser beam toward the V-groove portion 21 on the side of the trolley wire 20. That is, the irradiation device 2 is configured to irradiate the laser beam L inside the V-groove portion 21. The slit-like expansion of the laser beam L allows it to cross the entire width of the trolley wire 20 in the left-right direction. At this time, on the cross section of the trolley wire 20 cut by the vertical plane S, the laser beam L is irradiated at least to a portion near the boundary between the upper edge 22, which is the upper edge inside the V-groove portion 21, and the upper arc portion 23 further above it.

[0021] By irradiating the contact wire 20 with the laser beam L expanding in a slit shape within the vertical plane S in this manner, a bright line is formed along a part of the circumferential line on the cut surface of the contact wire 20 cut by the vertical plane S. At this time, as described above, the laser beam L is irradiated onto the entire width of the worn portion 25 and the V-groove portion 21, and therefore the bright line is formed on a part of the circumferential line that includes at least the entire width of the worn portion 25 and the outer end of the upper side 22 of the V-groove portion 21.

[0022] 1 and 4, the imaging device 3 is installed so as to capture an image of the bright line formed on the circumferential line of the trolley wire 20 as part of the contour of the trolley wire 20. Therefore, the imaging device 3 is installed from a position diagonally below the front or rear of the vertical plane S so that the angle of view F includes the trolley wire 20 in the vertical plane S, so that the contour can be captured from the front or rear. In particular, the imaging device 3 is installed with an angle of view tilted inward from either the left or right side of the vehicle 10 so that the bright line formed on the outer end of the upper edge 22 of the V-groove portion 21 can be captured. That is, the imaging device 3 is positioned so as to capture the bright lines corresponding to the worn portion 25 and the V-groove portion 21. Note that, because the imaging device 3 irradiates and captures the laser beam from below, no bright line is formed on at least the lower portion of the V-groove portion 21, and therefore no bright line is captured. That is, the bright lines corresponding to the worn portion 25 and the V-groove portion 21 are captured independently and separately from each other.

[0023] 1 again, the irradiation control device 4 can control the turning on and off of the irradiation device 2 based on a signal from the analysis device 5. In other words, the irradiation control device 4 controls the irradiation device 2 to be turned on by a turn-on signal received from the analysis device 5, and to be turned off by a turn-off signal received from the analysis device 5. When a plurality of irradiation devices 2 are provided, it is also preferable to individually control the turning on and off of each irradiation device 2 as necessary.

[0024] The analysis device 5 is the main control unit of the trolley wire cross-sectional shape measurement system 1. As described above, the analysis device 5 can send signals related to turning on and off the irradiation device 2 to the irradiation control device 4 as needed. The analysis device 5 also controls the operation of the imaging device 3, collects captured images, stores them in a storage device (not shown), and performs image analysis. In image analysis, highly bright pixels are extracted from the captured image, and the position of the trolley wire 20 is identified in the vertical plane S from their distribution. Furthermore, the cross-sectional shape of the trolley wire 20 can be measured from the position of the pixel corresponding to the bright line at the identified position.

[0025] Next, a method for measuring the cross-sectional shape of the trolley wire 20 will be described with reference to FIGS. 7 to 10 in addition to FIGS.

[0026] 5, first, a slit-shaped laser beam L is projected from the irradiation device 2 to irradiate the trolley wire 20 (S1: irradiation step). Here, a turn-on signal is sent from the analysis device 5 to the irradiation control device 4, and the irradiation control device 4, upon receiving the signal, turns on the irradiation device 2. As a result, the laser beam L projected from the irradiation device 2 is irradiated onto the entire width of the worn portion 25 and the portion near the boundary between the V-groove portion 21 and the upper arc portion 23 on the cut surface of the trolley wire 20 cut by the vertical plane S.

[0027] Next, the imaging device 3 captures an image of a bright line formed along a part of the circumferential line on the cross section of the trolley wire 20 cut by the vertical plane S (S2: imaging step). The image obtained by imaging is transferred to the analysis device 5 and stored.

[0028] The obtained image is subjected to image analysis by the analysis device 5 (S3: analysis step). In image analysis, the analysis device 5 performs processing in a predetermined procedure by executing a computer program having a predetermined algorithm. In performing image analysis, the analysis device 5 first calculates the brightness of each pixel of the obtained image and converts it into two-dimensional image data based on brightness. In other words, pixels with high brightness are displayed brightly and pixels with low brightness are displayed darkly, and the image data based on brightness is provided for image analysis. Note that part of the calculation processing by the analysis device 5 may be performed in advance by an internal calculation processing device of the imaging device 3.

[0029] As shown in Figure 6, in the image analysis (S3), first, a pixel group corresponding to the worn portion 25 is extracted based on the brightness and coordinates of each pixel in the brightness-based image data (S11). For example, pixels with similar brightness and position are grouped, and the area of ​​each group is obtained. Groups or areas with low brightness that are presumed to be noise, and groups or areas with a small number of pixels, are removed. In other words, pixels in areas or groups that are determined not to correspond to the trolley wire 20 are removed. Then, a pixel group corresponding to the worn portion 25 is extracted based on the arrangement and position of pixels with high brightness.

[0030] Referring also to Figure 7, more specifically, if the pixels are arranged in a horizontal line or are located lower on the screen, it is determined that there is a high possibility that the pixel group corresponds to the worn portion 25, and therefore such pixel group G1 is extracted.

[0031] Next, pixels corresponding to the bright line formed in the V-groove portion 21 are extracted (S12). For example, the approximate position of the V-groove portion 21 can be determined based on the position of the pixel group corresponding to the worn portion 25. In this case, the center of the pixel group G1 corresponding to the worn portion 25 is used as a reference, and the position is determined to be the upper left position at a distance closer than the diameter of the trolley wire 20. A pixel group with high brightness within that range is extracted and determined as the pixel group G2 corresponding to the V-groove portion 21.

[0032] 8, pixels at the boundary between the V-groove portion 21 and the upper arc portion 23 are extracted (S13). First, a central pixel P1 is determined from the pixel group G1 corresponding to the worn portion 25, and then a pixel P2 that is the furthest from pixel P1 is extracted from the pixel group G2 corresponding to the V-groove portion 21 and is determined as the pixel at the boundary between the V-groove portion 21 and the upper arc portion 23.

[0033] Then, pixels P3 and P4 are determined at the left and right ends of pixel group G1 corresponding to the worn portion 25, and a pixel PC corresponding to the center of the trolley wire 20 is determined from the positions of these three pixels, including pixel P2 (S14). Since pixels P2, P3, and P4 are all pixels corresponding to points on the arc of the trolley wire 20, and a circle passing through the positions of these three pixels is uniquely determined, the center of this circle is determined as pixel PC corresponding to the center of the trolley wire 20. In other words, the pixel PC is determined to be a pixel that is equidistant from pixels P2, P3, and P4.

[0034] Next, the wear amount of the trolley wire 20 is calculated (S15: calculation step). Here, the cross-sectional area lost due to wear of the trolley wire 20 is calculated as the wear amount. As described above, the pixel PC corresponding to the center of the trolley wire 20 is determined, and the wear amount can be calculated from the position of the pixel formed by the circle centered on this and the bright line corresponding to the worn portion 25. At this time, a known trolley wire cross-sectional line may be superimposed and compared. For example, it is preferable to include a comparison step in which a known trolley wire cross-sectional line is superimposed and compared in accordance with the positions of the above-mentioned three pixels. By superimposing and comparing known trolley wire cross-sectional lines, the wear amount can be calculated more accurately.

[0035] Finally, the remaining cross-sectional area of ​​the contact wire 20 obtained from the calculated wear amount is used to calculate the equivalent remaining diameter (S16).

[0036] The above-described method can measure the cross-sectional shape of the trolley wire 20. In particular, since the amount of wear can be measured based on the position of the V-groove portion 21, which is a non-wear portion, the cross-sectional shape of the trolley wire can be measured accurately even when the amount of wear is large or uneven wear occurs.

[0037] For example, in a trolley wire 20 in which the amount of wear has increased due to the progression of wear as shown in Figure 9, in the conventional method of distinguishing between the arc region and the worn region, the lower arc portion 24, which is the left and right arc region, becomes smaller, making it difficult to distinguish. In contrast, according to this embodiment, the pixels corresponding to the left and right ends of the worn region 25 and the pixels corresponding to the V-groove portion 21, which is the non-worn region, are used as references, so it is possible to measure the amount of wear regardless of the size of the arc region.

[0038] 10, when wear progresses further and the worn portion 25 overlaps the V-groove portion 21, both ends of the worn portion 25 are no longer points on the arc, making it impossible to accurately measure the amount of wear even in this embodiment. However, the progression of the worn portion 25 toward the V-groove portion 21 can be determined based on the distance between pixel P1, which corresponds to the center of the worn portion 25, and pixel P2, which corresponds to the intersection of the V-groove portion 21 and the upper arc portion 23. For example, if the trolley wire has the lower arc portion 24 as half of its circumference, it can be determined that the worn portion 25 has reached this state when the distance between pixel P1 and pixel P2 becomes smaller than the radius of the trolley wire 20.

[0039] 11(a), in the conventional light-section method, the vicinity of the boundary 25b between the uneven wear portion 25a caused by uneven wear and the worn portion 25 is judged to be an arc portion, and the position where the known contact wire cross section line 29 is to be superimposed cannot be correctly identified. In this case, the remaining diameter d2 is judged to be larger than the actual remaining diameter d1.

[0040] In contrast, as shown in FIG. 1(b), according to this embodiment, the cross-sectional shape of the trolley wire 20 can be accurately measured even when the worn portion 25 is unevenly worn. In this embodiment, as described above, the V-groove portion 21, which is a non-worn portion, can be used as a positional reference. Therefore, based on this reference, the known trolley wire cross section can be superimposed at the correct position. As a result, by measuring the area between the worn portion 25 and the known trolley wire cross section, the amount of wear can be accurately calculated. In addition, the remaining diameter can be accurately calculated according to the amount of wear.

[0041] Next, the results of measuring the cross-sectional shape of the contact wire by the conventional method and the method of this embodiment will be explained. 2 Contact wire and 110mm 2 A contact wire was used for the measurements.

[0042] As shown in Figure 12, 170mm 2 The error between the residual diameter calculated by image analysis and the true value of the measured residual diameter of the contact wire was investigated. The example (Fig. 1(a)) is based on the above-mentioned method, and the comparative example (Fig. 1(b)) is based on the method described in Patent Document 1, which calculates the residual diameter based on the left and right arc regions of the lower arc portion 24. The curves above and below the line with an error of 0 mm indicate the range of error that occurs in the residual diameter obtained when the measurement error of the sliding surface width is assumed to be ±0.2 mm in the measurement method using the sliding surface width (hereinafter referred to as the sliding surface width method).

[0043] In the comparative example, the accuracy equivalent to that of the sliding surface width method can be ensured up to a remaining diameter of 11 mm. On the other hand, in the example, the accuracy equivalent to that of the sliding surface width method can be ensured up to a remaining diameter of 8 mm. In other words, according to the above example, the range of wear amount where the accuracy equivalent to that of the sliding surface width method can be ensured is wider than that of the conventional method.

[0044] As shown in Figure 13, 110mm 2 Similarly, the error between the true value of the residual diameter calculated from image analysis and the actual value of the contact wire was investigated. In the comparative example (Fig. 1(b)), although there is no data for small residual diameters, other data indicates that the residual diameter that can ensure accuracy equivalent to that of the sliding face width method is up to 9.5 mm. On the other hand, in the example (Fig. 1(a)), accuracy equivalent to that of the sliding face width method can be ensured for residual diameters up to 7 mm.

[0045] As described above, according to the above-described embodiment, the cross-sectional shape of the contact wire can be accurately measured until the remaining diameter becomes relatively small.

[0046] While the exemplary embodiments of the present invention and the accompanying modifications have been described above, the present invention is not necessarily limited thereto and may be modified as appropriate by those skilled in the art. In other words, those skilled in the art will be able to find various alternative embodiments and modifications without departing from the scope of the appended claims. [Explanation of symbols]

[0047] 1. Measurement System 2 Irradiation device 3. Imaging device 5 Analysis device 20 Contact wire 21 V groove 23 Upper arc 24 Lower arc 25 Wear area L laser beam P1~P4 pixels G1 and G2 pixel groups

Claims

1. A method for measuring wear on a contact wire that supplies power to a railway vehicle running on a track, comprising: an irradiation step of irradiating the trolley wire with a laser beam in a slit shape with an optical axis directed upward in a vertical plane substantially perpendicular to the direction in which the track extends; an imaging step of imaging a bright line formed along a part of a circumferential line on the cut surface of the contact wire in the vertical plane; an analysis step of analyzing the image captured in the imaging step, the irradiation step applies the laser beam toward the worn portion of the trolley wire and the V-groove portion on the side of the trolley wire, and the imaging step images the bright lines corresponding to the worn portion and the V-groove portion, respectively; The analyzing step extracting a group of pixels corresponding to the worn portion; extracting pixel groups G1 and G2 corresponding to the worn portion and the V-shaped groove portion, respectively, from the bright line; a calculation step of overlaying a known trolley wire cross-sectional line of the trolley wire in accordance with the positions of three pixels among the pixel group G2: pixel P2 which is the pixel farthest from pixel P1 at the center of the pixel group G1 in the column direction; and pixels P3 and P4 which are at both ends of the pixel group G1 in the column direction; and calculating the wear cross-sectional area of ​​the lower part surrounded by the trolley wire cross-sectional line and the pixel group G1 as the wear amount.

2. 2. The method for measuring the wear amount of a contact wire according to claim 1, wherein the calculation step includes a step of calculating an equivalent remaining diameter from the remaining cross-sectional area.

3. 2. The method for measuring the wear amount of a contact wire according to claim 1, wherein the calculating step includes a step of comparing the distance between the pixel P1 and the pixel P2 with a known radius of the contact wire.

4. 2. The method for measuring the amount of wear of a contact wire according to claim 1, wherein the imaging step images the bright lines corresponding to the worn portion and the V-groove portion independently and separately.

5. A method for measuring the amount of wear of a trolley wire as described in claim 4, characterized in that the imaging step images the intersection between the arc portion above the V-groove portion and the V-groove portion on the cut surface of the trolley wire.

6. A system for measuring wear on a contact wire that supplies power to a railway vehicle traveling on a track, comprising: an irradiation device that applies a laser beam in a slit shape to the trolley wire with an optical axis directed upward in a vertical plane that is substantially perpendicular to the direction in which the track extends; an imaging device that images a bright line formed along a part of a circumferential line on the cut surface of the trolley wire in the vertical plane; an analysis device that analyzes the image captured in the imaging step and determines the amount of wear of the contact wire by image analysis, the irradiation device is arranged to apply the laser beam toward the worn portion of the trolley wire and the V-groove portion on the side of the trolley wire, and the imaging device is arranged to image the bright lines corresponding to the worn portion and the V-groove portion, respectively; The analysis device extracting a group of pixels corresponding to the worn portion; extracting pixel groups G1 and G2 corresponding to the worn portion and the V-shaped groove portion, respectively, from the bright line; a calculation step of overlaying a known trolley wire cross-sectional line of the trolley wire in accordance with the positions of three pixels among the pixel group G2: pixel P2 which is the pixel farthest from pixel P1 at the center of the column direction of pixel group G1; and pixels P3 and P4 which are at both ends of the column direction of pixel group G1; and calculating the wear cross-sectional area of ​​the lower part surrounded by the trolley wire cross-sectional line and pixel group G1 as the wear amount.

7. The contact wire wear measurement system according to claim 6, characterized in that the imaging device is arranged to image the bright lines corresponding to the wear portion and the V-groove portion independently and separately.

8. 7. The trolley wire wear measurement system according to claim 6, wherein the irradiation device is arranged on the ceiling of the railway vehicle so as to be positioned to the side of the trolley wire.

Images