JP2010243275A - Optical system for detecting abrasion wear of trolley wire, and device for measuring abrasion wear of trolley wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical system for detecting abrasion wear of a trolley wire and a device for measuring abrasion wear of a trolley wire that are small in device height and minimized. <P>SOLUTION: This optical system for detecting abrasion wear of the trolley wire includes a light projection unit that generates slit-like projection light, with a plurality of monochromatic light sources arranged in the rail crossing direction and radiates it to a sliding surface of the trolley wire. The optical system converts the projection light into pulse-like light by pulse-driving the light projection unit at a predetermined period, and irradiates it to the sliding surface of the trolley wire. Then, the optical system acquires a detection signal, regarding the sliding surface using the difference between light receiving signal of the reflected light from the trolley wire, when the projection light is irradiated and that when the projection light is not irradiated. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a trolley wire wear amount detecting optical system and a trolley wire wear amount measuring apparatus, and more specifically, measuring optics for measuring the wear amount of a trolley wire installed for power supply to a railway vehicle. The present invention relates to a trolley wire wear amount detection optical system that can reduce the size of a measurement optical system and can be mounted on the roof of a vehicle.

  The train vehicle on the train track obtains the required power from the trolley line via the pantograph upper surface (sliding plate). The lower surface (sliding surface or sliding surface) of the trolley wire and the upper surface of the pantograph are gradually worn by sliding contact with each other. The trolley wire is alternately displaced in the left-right direction for each supporting power pole so that the wear on the pantograph side does not concentrate on a part. The amount of wear and displacement of the trolley wire is inspected for good or bad by carrying a trolley wire wear amount measuring device in an inspection vehicle or the like and periodically measuring it.

One of the trolley wire wear amount measuring devices is a device that rotates a rotating polygon mirror (polygon mirror) on a horizontal plane, irradiates the trolley wire with a laser beam, and scans the trolley wire over its deviation range. One of them is that the reflected light from the trolley wire sliding surface obtained according to the scanning is received by the light receiving element through the perforated mirror to obtain the detection signal for the trolley wire sliding surface, corresponding to the scanning The generation width of the detection signal obtained in this way is calculated by a data processing device, thereby measuring the amount of trolley wire wear. An inspection vehicle equipped with such a trolley wire wear amount measuring device is already known (Patent Document 1).
The applicant has already applied for a trolley wire wear amount detection optical system that can be mounted on the roof of a commercial vehicle widely from the Shinkansen to the subway (Patent Document 2).

  For calculating the wear amount of the trolley wire wear amount measuring device, an image is collected by a CCD camera, the width of the sliding surface of the trolley wire is obtained by image processing, and the wear amount is measured therefrom (Patent Document 3). It is known to obtain a reflection signal from a wire sliding surface, obtain the width of the trolley wire sliding surface from the waveform, and calculate the amount of wear from this (Patent Documents 4 to 7).

JP 2001-59710 A JP 2007-24683 A JP-A-5-96980 Japanese Patent Laid-Open No. 5-34113 JP-A-5-290134 JP-A-10-194015 Japanese Patent Laid-Open No. 2005-271661

The trolley wire wear amount measuring apparatus as disclosed in Patent Document 1 is required to measure the wear amount of the trolley wire day and night. A light source for irradiating the trolley wire with laser light is a diode YAG laser as a solid laser and gas. Using a He—Ne laser or the like, it is necessary to generate a strong laser beam that is not inferior to sunlight and obtain reflected light from the trolley wire. Furthermore, a scanning system including a polygon mirror is required to cover the displacement range of the trolley line that is alternately displaced in the left-right direction as a detection range. Therefore, there is a drawback that the apparatus becomes large.
The thing of patent document 2 is devised about the width | variety and arrangement | positioning of a laser light source, the width | variety of a reflective mirror, and its arrangement | positioning in order to enable mounting on the roof of a business vehicle. However, since the trolley wire wear measuring device occupies most of the roof of the vehicle, the height of the vehicle itself is increased, the center of gravity of the vehicle is high, and the running stability such as the shaking of the vehicle body is lacking. There is.
SUMMARY OF THE INVENTION An object of the present invention is to solve such problems of the prior art, and to provide a trolley wire wear amount detecting optical system having a low apparatus height and capable of being downsized.
Another object of the present invention is to provide a trolley wire wear amount measuring apparatus that can reduce the size of a measuring optical system and can be mounted on the roof of a vehicle.

In order to achieve such an object, the trolley wire wear amount detecting optical system and the trolley wire wear amount measuring device according to the present invention are characterized by irradiating the trolley wire with projection light over the range of displacement of the trolley wire. In the trolley wire wear amount detection optical system that receives reflected light from the sliding surface of the trolley wire and obtains a detection signal about the sliding surface of the trolley wire,
A projecting unit that generates slit-shaped projecting light from a plurality of monochromatic light sources arranged in the rail transverse direction and irradiates the sliding surface of the trolley wire, and the projecting light as pulsed light at a predetermined cycle The drive circuit generated in the light projecting unit, the light receiving unit having a field of view that covers the displacement range of the trolley wire, the light receiving signal of the light receiving unit during light projection and the light reception when not projecting according to a predetermined cycle A detection circuit that obtains a light reception signal of the unit and generates a detection signal for the sliding surface based on a difference between the light reception signals, and the reflected light is a reflected light whose intensity is greater than the light intensity of daytime sunlight. Is generated on the sliding surface.

As described above, according to the present invention, there is provided a light projecting unit that generates slit-shaped light projecting light from a plurality of monochromatic light sources arranged in the rail transverse direction and irradiates the sliding surface of the trolley wire. By pulsing the optical unit at a predetermined cycle, the projection light is irradiated as pulsed light onto the sliding surface of the trolley wire. As a result, the reflected light of the sliding surface of the trolley wire when irradiated with the projection light becomes strong, but the reflected light when not irradiated with the projection light is due to extraneous light including sunlight. It is usually only what is called sky noise.
Therefore, a detection signal for the sliding surface when the projection light is irradiated is obtained by taking the difference between the light reception signals of the reflected light from the trolley line when the projection light is irradiated and when it is not.
The projected light makes the reflected light from the sliding surface of the trolley wire monochromatic and generates reflected light on the sliding surface that is stronger than the daytime sunlight light intensity. Reflective light that is not lost is obtained.
In particular, if the monochromatic light in the infrared region is used, the difference from the intensity of sunlight increases, and there is no need to provide a light source that generates strong laser light. In addition, when monochromatic light is irradiated onto the trolley line over the range of deflection of the trolley line, it is only necessary to arrange a plurality of light sources in the rail transverse direction, thereby eliminating the need for rotational scanning with a polygon mirror or the like. Thus, the light projecting system and the light receiving system can be reduced in size.
As a result, it is possible to reduce the size of the light projecting system and the light receiving system, whereby the trolley wire wear amount detecting optical system can be mounted on the roof of the vehicle.

FIG. 1 is a diagram for explaining the measurement principle of the measurement optical system of the present invention. FIGS. 2A to 2D are explanatory diagrams of light reception signals in the light receiver of the measurement optical system when the projection light having the wavelength of monochromatic light in the infrared region is irradiated and when it is not. FIG. 3 is an explanatory side view of an overhead wire inspection vehicle equipped with a trolley wire wear amount measuring apparatus using the measurement optical system shown in FIG. FIG. 4 is a schematic plan view showing the internal structure of the trolley wire wear amount measuring device with the top plate removed.

FIG. 1 illustrates the principle of the present invention. Reference numeral 1 denotes a measuring optical system of a trolley wire wear amount measuring apparatus 10 (see FIG. 3). This includes a light projecting unit 2, an imaging lens 3, a light receiving unit 4, a pulse driving circuit 5 for driving the light projecting unit 2 in a pulsed manner, and a light receiving signal processing unit 6.
The light projecting unit 2 irradiates the trolley wire 20 with monochromatic light having a specific wavelength in the range of infrared light. The light receiving unit 4 receives the reflected light from the trolley wire 20 through the imaging lens 3.
In the figure, L1 is the light projected by the light projecting unit 2, and the wavelength of the monochromatic light by the light projecting unit 2 is, for example, λ = 850 nm. L2 is the reflected light from the sliding surface 20a of the trolley wire 20. Reference numeral 3a denotes a focusing lens of the light projecting unit 2.
The light receiving unit 4 is a light receiver of the CCD line sensor, and receives the reflected light L2 in the entire light wavelength region of the CCD photosensitivity characteristics. The entire light wavelength region usually has a gentle mountain-shaped peak characteristic in the range of 300 nm to 1000 nm, covers the visible light region, and reaches the infrared light region.
The pulse driving circuit 5 drives the light projecting unit 2 in pulses to turn on / off the light L1 emitted from the light projecting unit 2 at a predetermined cycle to generate pulsed light. Then, a pulse-driven synchronization signal SYN corresponding to a predetermined cycle is sent to the received light signal processing unit 6. Note that the light projection light L1 can be turned on / off at a predetermined cycle by providing a shutter for the light projection light L1 and opening and closing it.
The received light signal processing unit 6 includes an A / D conversion circuit (A / D) 16, a waveform data memory 17, and an arithmetic device 18, and the detection signal S of the trolley wire sliding surface calculated by the arithmetic device 18. (See FIG. 2D) is sent as a digital value to the measuring device 19.
The synchronization signal SYN from the pulse drive circuit 5 is input to the A / D 16 and the waveform data memory 17, and a light reception signal A shown in FIG. 2A described later is sent in synchronization with the synchronization signal SYN. The light reception signal B in FIG. 2B is sent to the A / D 16 at the stop timing. As a result, the light reception signal A and the light reception signal B are alternately and serially sent to the A / D 16 in synchronization with the synchronization signal SYN.
Note that the emission period of the projection light L1 is T / 2 or less, where T is the period of the synchronization signal SYN.

The light projecting unit 2 is composed of a plurality of infrared region monochromatic light sources 2a, 2b,... Arranged in the transverse direction of the rail 21 shown in FIG. Therefore, the array lines of the CCD line sensors in each of the light receivers 4a and 4b are in the transverse direction of the rail 21, that is, the direction perpendicular to the paper surface.
As shown in FIG. 3, the light receiving unit 4 can be provided as a line sensor camera 9 having a CCD line sensor built in with the imaging lens 3.
Returning to FIG. 1, the projection light L 1 of the projection unit 2 generates reflected light on the sliding surface 20 a of the trolley wire 20 that is stronger than the light intensity in the infrared region of daytime sunlight. Usually, since the light intensity in the infrared region of daylight sunlight is not large, if the distance between the trolley wire 20 and the light projecting unit 2 is about 1 m to 1.5 m, a monochromatic light LED having a relatively small output of about 1 W. It becomes possible by using.
Therefore, even when such light sources are arranged in the rail crossing direction, the area occupied by the trolley wire wear amount measuring apparatus 10 is small.

Here, when the light projecting unit 2 is pulse-driven by the pulse driving circuit 5, the light receiving unit 4 receives the light receiving signal A when the light projecting light L1 of the light projecting unit 2 is irradiated and the light receiving signal when it is not irradiated. Two types of signals B and B are output.
FIG. 2 is an explanatory diagram of the two types of signals, light reception signals A and B.
As shown in FIG. 2A, the light reception signal A obtained by the light receiving unit 4 when the light projection light L1 is irradiated is a light reception signal A1 of extraneous light from the sky (hereinafter referred to as sky noise) and the trolley wire 20. This is the sum of the reflected light A2 of monochromatic light from the sliding surface 20a. It occurs along the line direction of the CCD. Note that the light reception signal of the light receiving unit 4 is sequentially and serially output simultaneously and serially along the CCD line direction, and the reading is continuously repeated. The readout circuit is not shown.
The vertical axis is the brightness (light reception level), and the horizontal axis is the line direction (rail crossing direction) in which the CCD line sensors are arranged. The same applies to FIGS. 2B to 2D.

At night, the light reception level of the light reception signal A1 is low, but since various external noises are mixed, the light reception signal A1 exists at a relatively low level.
On the other hand, the light receiving signal B of the light receiving unit 4 when the light projecting light L1 of the light projecting unit 2 is not irradiated is mainly monochromatic, as shown in FIG. The reflected light B2 is kept low.
The light reception signal processing unit 6 receives the synchronization signal SYN from the pulse drive circuit 5 and receives the light reception signals A and B as waveform data via the A / D 16 in synchronization with the synchronization signal SYN, and projects the light reception signals A and B with reference to the synchronization signal SYN. It is divided at the timing when the light stops and stored in different areas of the waveform data memory 17. Further, the arithmetic unit 18 reads the waveform data stored in different areas and generates a difference signal C that takes the difference between the received light signals A and B. The difference signal C is, as shown in FIG. 2C, a pulsed trolley wire sliding surface reflection signal (difference signal) C (= A1 + A2−B1−B2) having a width corresponding to the trolley wire wear amount. Become. Further, the arithmetic device 18 generates a detection signal S of the trolley wire sliding surface shown in FIG. 2D from the difference signal C and outputs it to the measuring device 8.
The detection signal S of the trolley wire sliding surface is obtained by detecting the peak value P of the difference signal C and clipping the difference signal C at a level substantially ½ of the peak value P.
The waveform data memory 17 is a buffer memory as will be described later, temporarily stores the waveform data of the light reception signals A and B, and the old data is discarded.
The measuring device 19 calculates the trolley wire wear amount (residual diameter) based on the detection signal S of the trolley wire sliding surface. The calculation of the amount of trolley wire wear (residual diameter) is described in various patent publications cited as prior art documents, and the description thereof is omitted.

FIG. 3 is an explanatory side view of an overhead wire inspection vehicle equipped with a trolley wire wear amount measuring apparatus using the measurement optical system shown in FIG.
In FIG. 3, reference numeral 10 denotes a trolley wire wear amount measuring device, which is installed on the vehicle roof upper surface 23 of the overhead wire inspection vehicle 22.
The trolley wire wear amount measuring apparatus 10 includes a measurement optical system 1, a trolley wire height detection mechanism 7, and a measurement optical system control unit 8.
The measuring optical system 1 includes a light projecting unit 2, a line sensor camera 9 having two CCD line sensors with a built-in imaging lens 3, and a light receiving optical system 11 provided in front of the line sensor camera 9. Consists of.
The light receiving optical system 11 includes a rotating mirror 12, a folding reflection mirror 13 that returns reflected light in the incident direction, and a mirror moving mechanism 14 that moves the folding reflection mirror 13 back and forth, depending on the height of the trolley wire 20. The angle of the reflected light L2 is controlled so as to guide the change of the reflected light L2 from the sliding surface 20a that changes to the line sensor camera 9.
The light projecting unit 2 is also mounted on the rotary table 15, and the angle of the light projecting light L1 is controlled so as to follow the height of the sliding surface 20a that changes according to the height of the trolley wire 20.

FIG. 4 is a schematic plan view showing the internal structure of the trolley wire wear amount measuring apparatus 10 with the top plate removed.
The light receiving optical system 11 shown in FIG. 4 is different from FIG. 3 in that the folding reflection mirror 13 and its mirror moving mechanism 14 are omitted for the convenience of explaining the relationship of the divided light reception of the line sensor camera 9, and the trolley wire 20 is omitted. The line sensor camera 9 (9a, 9b, 9c) is provided at the end of the reflected light L2 without being reflected back from the reflected light L2, and is directly received.
As shown in FIG. 4, the light projecting unit 2 shown in FIG. 3 generates a slit-shaped light beam L by arranging a large number of single-color LED light emitters 2a, 2b,. To do. The width of the rail 21 in the transverse direction is such that the irradiation light L1 to the trolley wire 20 covers the deviation range (≈700 mm) of the trolley wire 20.
The light emitted from the LED light emitters 2a, 2b,... 2n is applied to the trolley wire 20 as a slit-shaped light beam L through the slit shaping condenser lens 2P.
The light projecting unit 2 generates a slit-shaped light beam L by enlarging the semiconductor laser light source 2Q as indicated by the dotted line in the transverse direction of the rail 21 with a lateral magnification lens instead of the LED light emitters 2a to 2n. Also good.

The rotating mirror 12 of the light receiving optical system 11 is installed as a mirror having a light receiving length of the reflected light L2 in the transverse direction of the rail 21 in order to receive the reflected light L2 in the deflection range (≈700 mm) of the trolley wire 20. Yes.
In the drawing, the rotation driving mechanism of the rotating mirror 12 is not shown, but the rotating shaft 12a is fixed to the back surface of the rotating mirror 12, and the rotating shaft is driven by a stepping motor.
The line sensor camera 9 is composed of three line sensor cameras 9a, 9b, and 9c, and divides the reflected light L2 into three so that the reflected light from the sliding surface 20a enters one of the cameras. Receive light. Note that the mutual light receiving boundary regions overlap each other. Thereby, the visual field which covers the deflection | deviation range of the trolley wire 20 is formed.
The number of divided light receiving cameras is not limited to three as long as a plurality of cameras are provided.

Returning to FIG. 3, the trolley wire height detection mechanism 7 includes a roller-type contact 7 a that comes into contact with the trolley wire 20, and a bending-supported turning arm 7 b in which two arms are linked to each other. It comprises an angle detector 7c in the vertical direction by a potentiometer that detects the rotation angle of the link on the root side.
A height detector that detects the height of the trolley wire by the angle of the rotating arm by this type of potentiometer is a well-known technique as described in, for example, Japanese Patent Laid-Open No. 7-120228. Therefore, the detailed explanation is omitted.

The projected light L1 from the light projecting unit 2 to the trolley wire 20 is a sliding surface 20a of the trolley wire 20 through the glass window 10b provided on the roof frame 10a (see FIG. 3) of the trolley wire wear amount measuring apparatus 10. Is irradiated.
The reflected light L2 from the trolley wire 20 passes through the glass window 10b, passes through the rotating mirror 12 and the folding reflecting mirror 13, and is in the field of view of any of the line sensor cameras 9 (three line sensor cameras 9a, 9b, 9c). Then, an image (one-dimensional waveform data) including the sliding surface 20a of the trolley wire 20 is received.
The glass window 10b is attached to the roof frame 10a at an angle of about 10 ° with respect to the horizontal plane of the roof frame 10a of the trolley wire wear measuring device 10.
The height of the roof frame 10a is actually at a position sufficiently lower than the lower limit height at which the trolley wire 20 is displaced up and down. This lowers the position of the glass window 10b. Therefore, the trolley wire wear amount measuring apparatus 10 can be installed with almost no influence on the height of the roof of the vehicle.

The measurement optical system control unit 8 receives the trolley line height signal from the angle detector 7c of the trolley line height detection mechanism 7 and receives the rotary table 15 of the light projecting unit 2, the rotary mirror 12, and the mirror moving mechanism 14. Is controlled so that an image (one-dimensional waveform data) of the trolley line 20 is collected in the field of view of the line sensor camera 9 even if the height of the trolley line 20 changes. Take control.
The measurement optical system control unit 8 is provided with a control data table 8 a for follow-up control with respect to the height of the trolley wire 20. In the control data table 8a, the angle value of the rotary table 15, the angle value of the rotary mirror 12, and the amount of movement of the mirror moving mechanism 14 are stored as control values corresponding to the detection value of the angle detector 7c. . Each control value is obtained in advance by analyzing each angle value of the rotary table 15 and the rotary mirror 12 and the amount of movement of the mirror moving mechanism 14 according to the height of the trolley wire 20.

On the other hand, the rotary table 15, the rotary mirror 12, and the mirror moving mechanism 14 each have a built-in encoder that indicates the current angle and moving position, and each is driven by a stepping motor. It is input to the control unit 8.
Therefore, the measurement optical system control unit 8 controls the rotary table 15, the rotary mirror 12, and the mirror moving mechanism 14 with reference to the control data table 8a, regardless of the change in the height of the trolley wire 20. Control is performed so that the image (one-dimensional waveform data) of the sliding surface 20a of the trolley wire 20 is received within the field of view of the line sensor camera 9 (three line sensor cameras 9a, 9b, 9c).

The line sensor camera 9 (three line sensor cameras 9a, 9b, 9c) is a digital camera having an A / D converter therein. Therefore, A / D 16 of the received light signal processing unit in FIG. 1 is deleted. The image output is a digital value. The digital values of the one-dimensional images of the three line sensor cameras 9a, 9b, 9c are read out in parallel, and the two CCDs of each line sensor camera are output simultaneously and serially simultaneously in synchronization. Is repeated continuously. The digital values of the one-dimensional images of the three line sensor cameras 9a, 9b, 9c are directly sent to the waveform data memory 17. Each is stored in each area of the waveform data memory 17 as a one-dimensional image. The waveform data memory 17 is a push-down buffer memory that incorporates a controller that performs writing / reading, etc., and pushes down the stored data to store the latest waveform data at the head. A certain amount is temporarily stored, and the digital values of the old past one-dimensional image overflowed from the last storage location are sequentially discarded. The temporary storage capacity is set in relation to the processing time of the arithmetic device 18.
Each one-dimensional image of the three line sensor cameras 9a, 9b, and 9c has one of the waveform signals shown in FIG. 2A and FIG. Is remembered.

The waveform data of each one-dimensional image stored in the waveform data memory 17 is sequentially read out from the old one by the arithmetic unit 18 constituted by a DSP or the like and processed, and then the waveform data is deleted.
The images of the sliding surface 20a (one-dimensional waveform data) in the reflected light L2 received in three divisions by the three line sensor cameras 9a, 9b, and 9c correspond to the light reception signal A and the light reception signal B, respectively, with no overlap. Waveform data is synthesized. Next, it is processed as waveform data of the sliding surface 20a of one trolley wire 20, and the waveform signals shown in FIGS. 2 (a) and 2 (b) are generated. Data corresponding to the sliding surface reflection signal (difference signal) C (= A1 + A2−B1−B2) is calculated.
Further, the peak value P is detected, and a level that is substantially ½ of the peak level is calculated. With this ½ level as a reference, a value higher than this is set to “1”, and a value less than that is set to “0”. Binarization processing is performed, and digital value data having a pulse width corresponding to the detection signal S of the trolley wire sliding surface as shown in FIG. 2D is calculated. It is stored in internal memory. Then, the width of the trolley wire sliding surface is calculated by converting the number of pixels of the continuous portion of “1” into a distance (corresponding to the pulse width of the detection signal S of the trolley wire sliding surface), and the trolley wire The width of the sliding surface is sent to the measuring device 19 as a digital value.
The measuring device 19 has an MPU, a memory and the like inside, and wears based on the width of the trolley wire sliding surface calculated by the arithmetic device 18 by executing a predetermined processing program stored in the memory by the MPU. Calculate the amount.

As described above, in the embodiment, monochromatic light in the infrared region is used, but monochromatic light is monochromatic light that generates reflected light on the sliding surface of the trolley wire that is stronger than the light intensity of daytime sunlight. If it exists, it is not limited to the thing of an infrared region.
In the embodiment, the reflected light from the sliding surface of the trolley wire is received by a one-dimensional CCD line sensor or a one-dimensional CCD camera. The light receiving unit of the present invention is a one-dimensional CCD line sensor or CCD. It is not limited to the camera, and any two-dimensional CCD image may be compressed in one dimension, and any light-receiving unit can be used as long as it is a photoreceiver arranged in the rail crossing direction and capable of collecting the image of the sliding surface. There may be.
In addition, the light receiving unit of the present invention may be configured by one single light receiver as long as the field of view of the trolley wire deflection range can be secured.
Furthermore, in the embodiment, the arithmetic device 18 is provided outside the measuring device 19. However, the processing function of the arithmetic device 18 can be realized by program processing by the MPU provided in the measuring device 19. 18 may be deleted, and the calculation device 18 may be realized by the measurement device 19.
As a processing program in this case, a synthesis processing program for synthesizing waveform data corresponding to each of the light reception signal A and the light reception signal B from the light reception signals of a plurality of line sensor cameras, assuming that the reflected light L2 does not overlap, A processing program, a peak value detection program, and a binarization processing program for calculating a trolley wire sliding surface reflection signal (difference signal) C by calculating these differences based on waveform data corresponding to each of A and light reception signal B A program for calculating the width of the sliding surface of the trolley wire sliding surface.
Furthermore, the waveform data memory 17 may also be provided inside the measuring device 19.

1 ... Measuring optical system, 2 ... Projection unit,
3 ... imaging lens, 4 ... light receiving unit,
4a, 4b ... light receiver, 5 ... pulse drive circuit,
6 ... Light reception signal processing unit, 7 ... Trolley line height detection mechanism,
8: Measurement optical system control unit, 8a: Control data table,
9 ... Line sensor camera,
10 ... Trolley wire wear amount measuring device, 11 ... Light receiving optical system,
12 ... Rotating mirror, 13 ... Folding reflection mirror,
14 ... mirror moving mechanism, 15 ... rotating table,
16 ... A / D conversion circuit (A / D),
17 ... Waveform data memory, 18 ... Arithmetic unit,
19 ... Measuring device, 20 ... Trolley wire, 20a ... Sliding surface,
21 ... Rail, 22 ... Overhead inspection vehicle, 23 ... Vehicle roof top surface.

Claims (10)

Trolley wire wear amount detection optics for irradiating the trolley wire with light projected over the deflection range of the trolley wire and receiving reflected light from the sliding surface of the trolley wire to obtain a detection signal for the sliding surface In the system,
A light projecting unit that generates slit-shaped light projecting light by a plurality of monochromatic light sources arranged in the rail transverse direction and irradiates the sliding surface of the trolley wire;
A drive circuit for causing the light projecting unit to generate the light as pulsed light at a predetermined period;
A light receiving unit having a field of view that covers the deflection range of the trolley wire;
According to the predetermined period, a light reception signal of the light receiving unit at the time of light projection and a light reception signal of the light reception unit at the time of no light projection are obtained, and a detection signal for the sliding surface is obtained by a difference between the light reception signals. And a detection circuit for generating
The projection light is a trolley wire wear amount detection optical system that generates reflected light on the sliding surface that is stronger than light intensity of daytime sunlight.   2. The trolley wire wear amount detection optical system according to claim 1, wherein the projection light is monochromatic light in an infrared region, and the light receiving unit forms an image of the sliding surface on the light receiving surface through a lens. system.   The light receiving unit is a CCD camera having the lens, and the field of view is formed by providing a plurality of CCD cameras in the rail crossing direction, and the light projecting unit and the plurality of CCD cameras are arranged on a roof of a vehicle. The trolley wire wear amount detecting optical system according to claim 2, wherein the trolley wire wear amount detecting optical system is provided on the top.   And a reflection mirror that returns reflected light in the incident direction. The reflection light from the sliding surface is received by the rotation mirror and incident on the folding reflection mirror to be reflected from the sliding surface. 4. The trolley wire wear amount detection optical system according to claim 3, wherein light is incident on the plurality of CCD cameras.   Furthermore, it has a trolley wire height detector, and the light projecting unit, the rotating mirror, and the folding reflection mirror are in accordance with the height of the trolley wire detected by the height detector of the trolley wire. 5. The trolley wire wear amount detecting optical system according to claim 4, wherein the trolley wire wear amount detecting optical system is controlled so that reflected light from the sliding surface is incident on any of the plurality of CCD cameras. Trolley wire wear amount detection optics for irradiating the trolley wire with light projected over the deflection range of the trolley wire and receiving reflected light from the sliding surface of the trolley wire to obtain a detection signal for the sliding surface In a trolley wire wear amount measuring device comprising a system and a measurement device that receives the detection signal and calculates the wear amount of the trolley wire,
The trolley wire wear amount detecting optical system includes: a light projecting unit that generates slit-shaped light projecting light by a plurality of monochromatic light sources arranged in a rail transverse direction and irradiates the sliding surface of the trolley wire;
A drive circuit for causing the light projecting unit to generate the light as pulsed light at a predetermined period;
A light receiving unit having a field of view that covers the deflection range of the trolley wire;
According to the predetermined period, a light reception signal of the light receiving unit at the time of light projection and a light reception signal of the light reception unit at the time of no light projection are obtained, and a detection signal for the sliding surface is obtained by a difference between the light reception signals. A trolley wire wear amount measuring device for generating reflected light on the sliding surface, wherein the projected light is stronger than the intensity of sunlight in the daytime.   The trolley wire wear amount measuring apparatus according to claim 6, wherein the projection light is monochromatic light in an infrared region, and the light receiving unit forms an image of the sliding surface on the light receiving surface through a lens. .   The light receiving unit is a CCD camera having the lens, and the field of view is formed by providing a plurality of CCD cameras in the rail crossing direction, and the light projecting unit and the plurality of CCD cameras are arranged on a roof of a vehicle. The trolley wire wear amount measuring apparatus according to claim 7, which is provided on the top.   And a reflection mirror that returns reflected light in the incident direction. The reflection light from the sliding surface is received by the rotation mirror and incident on the folding reflection mirror to be reflected from the sliding surface. The trolley wire wear amount measuring apparatus according to claim 8, wherein light is incident on any of the plurality of CCD cameras.   Furthermore, it has a trolley wire height detector, and the light projecting unit, the rotating mirror, and the folding reflection mirror are in accordance with the height of the trolley wire detected by the height detector of the trolley wire. The trolley wire wear amount measuring apparatus according to claim 9, wherein the trolley wire wear amount measuring apparatus is controlled so that reflected light from the sliding surface is incident on the plurality of CCD cameras.

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