JP3244158B2 - Trolley wire height measurement optical system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring optical system for measuring the height of an overhead trolley wire.

[0002]

2. Description of the Related Art A train on a train track receives power through a pantograph contacting an overhead trolley wire and travels. The trolley wire is installed at a predetermined height, but it is necessary to maintain it at a reference value.For this purpose, a height detector is installed on the electric inspection car to measure the height periodically. Managed. This will be described with reference to FIG. In FIG. 3, (a) shows a side view and (b) shows a front view, and a pantograph 3 dedicated to measurement and a height detector 4 connected to the pantograph 3 are provided on the roof of the electric test vehicle 2. . The pantograph 3 has an arm mechanism 3a and a boat body 3b provided on an upper portion thereof and receiving power by contacting the trolley wire 1 which is deviated left and right within a deviation range D.
The height detector 4 comprises a drive arm 4a fixed to a rotation shaft 3c at the base of the arm mechanism 3a and a rotary variable resistor 4b coupled to the tip of the drive arm 4a. When the height of the trolley wire 1 changes, The rotation shaft 3c rotates according to this, and the resistance value of the variable resistor 4b changes, and the height is detected by this change.

The above-mentioned height detector 4 has the following disadvantages. In other words, in a double trolley line section or a trolley line retaining section where two trolley lines are laid in parallel, when both trolley lines are at the same height, there is no problem. As shown, when the heights of the two trolley wires T ₁ and T ₂ are different, the height of the lower trolley wire T ₁ is detected, but the height of the upper trolley wire T ₂ cannot be detected. In addition, since the height detector 4 has a mechanical structure, its inspection and maintenance are not always easy.

To solve the above problem, the inventor of the present invention has devised an optical height measuring device, which is disclosed in Japanese Patent Application Laid-Open No. H5-25-2.
No. 78502, a trolley wire position measuring device ", which has been filed as a prior art, and its outline will be described with reference to FIG. In FIG. 4 (a), the electric inspection vehicle 2
A light projecting device 51 and two light receiving devices 52a and 52b composed of a CCD linear sensor are provided at a position shown on the roof of FIG. The laser beam L _T than the projector 51 is projected on the excursion range D, 2 Article trolley wire T _1, T ₂ of the reflected light L
_R sets the S / N ratio to be good by removing natural light such as the sky with an interference filter (not shown), and the two light receivers 52a and 52b
The image is formed on the light receiving element of the CCD linear sensor. In (b), the light receiving angles α ₁ and α ₂ shown in the figure are obtained from the positions of the light receiving elements that image the reflected light L _R1 of the trolley wire T ₁ .
The light receiving angles β ₁ and β ₂ are obtained from the positions of the light receiving elements that image the reflected light L _R2 of the trolley wire T ₂ . The data of these four light receiving angles is input to a signal processing unit (not shown), and the heights Z ₁ and Z _{2 of} both trolley wires T ₁ and T ₂ are calculated by applying the triangular measurement method. In the above description, the case of _two trolley wires T ₁ and T ₂ has been described. However, it is naturally possible to measure the case of only _one trolley wire, and it is possible to measure both day and night by removing natural light with an interference filter. ing.

[0005]

The height measurement by the above-mentioned position measuring device is a triangulation method, so that the arithmetic processing is slightly complicated, and the measuring optical system 5 has two light emitting devices on both sides of the projector 51. Since the light receivers 52a and 52b are arranged, there is a tendency that the occupied area is large and the size is slightly large. On the other hand, a height is required by a simpler measurement principle, and a compact measurement optical system is desirable. The present invention has been made in view of the above, and an object of the present invention is to provide a compact measuring optical system capable of measuring a height by a simple measuring principle.

[0006]

SUMMARY OF THE INVENTION The present invention is an optical system for measuring the height of a trolley wire, which is disposed on the roof of an electric inspection vehicle and has a length corresponding to the range of deviation of the trolley wire, and the length of the wire. For a rectangular area having an appropriate length in the stripe direction, a light projection that projects a radial light flux in which the intensity distribution in the linear direction forms a stripe pattern, and the interval between the stripes expands and contracts in proportion to the height. system and receives the reflected light of the light beam by Article 1 or 2 of Article trolley wire by a light receiving system composed of light receiving element having the sequence stripe pattern of the reflected light in excursion range of the trolley line is imaged Be composed. While the electric inspection car is running, the fringe interval of each imaged light receiving element is sequentially detected, and the data of the correspondence relation between the fringe height of the light receiving element and the height of the luminous flux is measured and stored in advance. Then, the height of each trolley line corresponding to the detected fringe interval is sequentially obtained. In the above, the radial light beam is a laser beam, an interference filter is provided in the light receiving system, and only the laser beam is extracted from the reflected light of the trolley wire,
It removes natural light such as the sky.

[0007]

In the above measuring optical system, the light projecting system
The stripe pattern of the radial luminous flux projected onto the rectangular area expands and contracts in proportion to the height of the stripe interval. The reflected light of the luminous flux due to the one or two trolley wires is sequentially received by the CCD image sensor of the light receiving system during traveling of the electric inspection vehicle, and the respective stripe patterns are formed on the respective light receiving elements. The fringe interval of the imaged light receiving element is sequentially detected.
The correspondence between the stripe height of the light receiving element and the height of the light beam is measured in advance, and the data is stored in an appropriate memory. With reference to this data, the trolley wire corresponding to the detected stripe interval of the light receiving element is referred to. Heights are required sequentially. In the above, the radial light beam is a laser beam, and the interference filter provided in the light receiving system extracts only the laser beam from the reflected light of the trolley wire, and removes natural light such as the sky contained in the reflected light, Measurement is possible regardless of day or night. As described above, in the measuring optical system of the present invention, the fringe interval of each light receiving element that forms the fringe pattern is detected, and the correspondence between the pre-measured light beam height and the fringe interval of the light receiving element is referred to. As a result, since the height of each trolley wire can be immediately obtained, the measurement principle is simpler than the conventional triangular measurement method. The system can be formed compactly by integrating the light projecting system and the light receiving system into one, and the above-mentioned object is achieved.

[0008]

FIG. 1 is a block diagram of a measuring optical system 6 according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram of a principle of height measurement with respect to FIG. In FIG. 1, the measuring optical system 6 is compactly configured by a frame 61 having a shape shown in the drawing, for example, fixed on the roof of the electric inspection vehicle 2, and a light projecting system 62 and a light receiving system 63 disposed thereon. Is done. The light projecting system 62 includes a laser light source 62
1, a collimator lens 622, stripe filter 623 having a fringe pattern P _S, the projection lens 624, and made of a half mirror 625, the light receiving system 63, interference filter 631 to the wavelength of the laser beam L _T and the transmission region, imaging It comprises a lens 632 and a CCD image sensor 633 in which light receiving elements e are arranged. Each component is arranged as shown, and is appropriately covered (not shown) to block stray light. Memory 7a at an appropriate location
Is provided.

Hereinafter, the operation of the measuring optical system 6 will be described.
In light projecting system 62, the laser beam L _T to the laser light source 621 is output in parallel converted by the collimator lens 622 is diffused by the light projecting lens 624 passes through the stripe pattern P _S stripe filter 623, a half mirror After 625,
For a rectangular area K having a length Y _L (z) corresponding to the displacement range D of the trolley wire and an appropriate length X _L (z) in the linear direction, the laser beam L of the stripe pattern S _B is projected radially. The stripe interval Δs between the region K and the stripe pattern S expands and contracts in proportion to the height Z. Figure 1 shows the case of a trolley wire T _1, T ₂ of Article 2, during running of the electric Kensokusha 2, the laser beam L _B is reflected from both trolley lines T _1, T _2, each of the reflected light L _R1, L _R2 is transmitted through the half mirror 625, interference filters
631 removes natural light such as the sky, and extracts laser components of both fringe patterns S ₁ and S _2.
The image is sequentially formed on each light receiving element e of the CCD image sensor 633 by the 632, and the output signal of each light receiving element e is input to the signal processing unit 7 and processed. The memory 7a of the signal processing unit 7, in advance, the light receiving element e that height and imaging of the laser beam L _B
Is measured and the data is stored.

[0010] In FIG. 2 (a), the contact wire T ₁ is lower,
There trolley wire T ₂ is the upper side, each of the heights Z _1, Z
_2, the fringe pattern is projected on these laser beams L _B and S _1, S _2. The fringe interval between both fringe patterns S ₁ and S ₂ is
As shown in (b), the heights are proportional to the heights Z ₁ and Z ₂ , which are denoted by Δs ₁ and Δs ₂ . The two fringe patterns S ₁ and S ₂ reflected by the two trolley wires T ₁ and T ₂ are as shown in FIG.
An image is formed on each light receiving element e of the CCD image sensor 633,
These output signals are processed by the signal processing unit 7 to detect the fringe intervals Δs ₁ ′, Δs ₂ ′ of the imaged light receiving element e,
By referring to the data stored in the memory 7a, the height Z ₁ of the trolley wire T _1, T _2, Z ₂ is obtained immediately.

In the above description, the reflected light L _R1 , L _R2 of both trolley wires T ₁ , T ₂ can be measured both day and night since the natural light is removed by the interference filter 632. In the above embodiment, two trolley wires are used, but it is needless to say that the height Z can be measured even with one trolley wire.

[0012]

As described above, in the measuring optical system of the present invention, a laser beam having a stripe pattern is projected on a trolley wire while the electric inspection vehicle is running, and the reflected light is imaged. By detecting the fringe spacing of each light receiving element and referring to the correspondence between the fringe spacing of the light receiving element and the height of the light beam measured in advance, the height of one or two trolley wires can be immediately obtained. , Measurement is possible day and night,
The measurement principle is simpler than the conventional triangulation measurement method, and the measuring optical system is compactly configured with a light projecting system and a light receiving system as one body. Some are big.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a measurement optical system according to an embodiment of the present invention.

FIGS. 2A and 2B are explanatory views of the height measuring principle with respect to FIG. 1, wherein FIG. 2A is an explanatory view of the arrangement of the trolley wires, and FIG.
FIG. 3C is an explanatory diagram of a stripe pattern, and FIG.

FIG. 3 shows a configuration of a conventional height detector, and FIG.
FIG. 4B is a side view, FIG. 4B is a front view, and FIG. 4C is an explanatory view of a defect of the height detecting action for two trolley wires.

FIGS. 4A and 4B are explanatory diagrams of the prior art of the present invention, wherein FIG. 4A is a configuration diagram of a trolley wire position measuring device, and FIG.
FIG. 4 is an explanatory diagram of a measurement principle.

[Explanation of symbols]

1 ... trolley wire, 2 ... electric inspection car, 3 ... pantograph, 3
a ... arm mechanism, 3b ... boat body, 3c ... rotating shaft, 4 ... height detector, 4a ... drive arm, 4b ... variable resistor, 5 ... prior art trolley wire position measuring device, 51 ... Projector, 52a, 52b ... Receiver, 6 ... Measurement optical system of the present invention, 61
… Frame, 62… light projection system, 621… laser light source, 622… collimator lens, 623… strip filter, 624… light projection lens, 625… half mirror, 63… light reception system, 631… interference filter, 632… imaging lens , 633 ... CCD image sensor, 7 ... signal processing unit, 7a ... memory, T, T _1, T ₂ ... trolley wire, D ... excursion range, the height of Z _1, Z ₂ ... trolley wire T _1, T ₂ L _T ... laser beam, L _B ... radial laser beams, K ...
Square area, P _S ... fringe pattern stripe filter, S ... fringe pattern of the laser beam _{L B, S 1, S 2} ... trolley wire T _1, T ₂
, Δs ₁ , Δs ₂ ... Stripe pattern S
_1, fringe spacing of S _2, L _R ... reflected light, L _R1, L _R2 ... trolley wire T _1, T ₂ of the reflected light, e ... CCD image receiving element of the _{sensor, Δs 1 ', Δs 2'} ... imaging The fringe interval of the light receiving element e.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-278502 (JP, A) JP-A-2-140605 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01B 11/00-11/30 102 B60M 1/28 B61K 9/08

Claims (2)

(57) [Claims] 1. A linear region which is disposed on a roof of an electric inspection vehicle and has a length corresponding to a range of deflection of a trolley wire and an appropriate length in a direction of a line of the trolley wire. A light projection system for projecting a radial light beam whose intensity distribution in the direction forms a stripe pattern, and the stripe interval of the stripe pattern expands and contracts in proportion to the height, and the light beam by one or two trolley wires And the reflected light in the deflection range of the trolley wire
It from the light receiving element having the sequence fringe pattern is imaged
That is composed of a light receiving system, during running of the electric Kensokusha, sequentially detects the fringe spacing of the light receiving elements and said imaging was previously measured and stored, receiving to the height of the light beam A trolley wire height measuring optical system, wherein the height of each of the trolley wires corresponding to the detected fringe intervals is sequentially obtained with reference to data on the correspondence relationship between the stripe fringes of the elements. 2. The light-receiving system has a CCD image sensor comprising the arrayed light-receiving elements , uses the radial light beam as a laser beam, provides an interference filter in the light-receiving system, and detects reflected light from the trolley wire. 2. The trolley wire height measuring optical system according to claim 1, wherein only a laser beam is extracted and natural light such as sky is removed.