CN108709497B - Contact net geometric parameters detection device - Google Patents
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- CN108709497B CN108709497B CN201810319959.XA CN201810319959A CN108709497B CN 108709497 B CN108709497 B CN 108709497B CN 201810319959 A CN201810319959 A CN 201810319959A CN 108709497 B CN108709497 B CN 108709497B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
- G01B11/0608—Height gauges
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Abstract
The invention discloses a contact net geometric parameter detection device which comprises a camera module (1), a light source module (2), a synchronous control unit (3) and a sensor (4). The camera module adopts a stereoscopic vision mode to measure geometrical parameters of the overhead line system, each linear array camera is arranged at different positions of the same plane, and the visual fields of the linear array cameras respectively cover the space range of the contact line. The working mode of the light source module is synchronous stroboscopic, and the camera module and the light source module are synchronously triggered by the same pulse signal, so that synchronous exposure of the camera and synchronous stroboscopic illumination of the light source are realized. The camera module and the light source module are arranged in a linear mode, and the strongest cross section of the light beam formed by the LED light source module and the linear array camera imaging chip are located on the same plane. The invention has the advantages that: the geometrical parameters of the overhead line system are measured in a stereoscopic vision mode, so that the detection precision is high; by adopting the LED synchronous stroboscopic illumination mode, the light supplementing brightness is high and uniform, the image quality is obviously improved, and the system power consumption is greatly reduced.
Description
Technical Field
The invention relates to the technical field of railway catenary measurement, in particular to a catenary geometric parameter detection device.
Background
The contact net is an important device of traction power supply systems for electrified railways and rail transit. The electric locomotive is in sliding contact with the contact line through the pantograph and obtains electric energy. To ensure safe operation of electrified railways and rail transit, ensure good contact and reliable current taking of the bow net, the contact net must be detected regularly so as to discover and eliminate hidden danger in time besides meeting certain standard requirements in aspects of contact net design, construction and operation. The geometrical parameters of the overhead contact system such as pull-out values, guide heights and the like are important items for overhead contact system detection, and the overhead contact system needs to be detected regularly to confirm the technical state of the overhead contact system. The traditional field manual detection mode has low detection efficiency, personnel on-line detection needs to apply for maintenance of a skylight, safety is low, the method is especially unable to adapt to a totally enclosed management mode of a high-speed railway, and only static geometric parameter measurement can be carried out on a contact network, so that the technical state of the contact network in the real running state of a train cannot be mastered.
Compared with the on-site manual detection mode, the mode of automatically detecting by adopting the special vehicle provided with the geometrical parameter detection equipment of the overhead line system has incomparable advantages of high measurement precision and efficiency, good safety, no occupation of maintenance skylight, capability of constant-speed measurement to detect the technical state of the overhead line system in the real running state of the train and the like, and represents the development direction of the overhead line system detection technology. Compared with the contact type measuring technology of the contact net, the non-contact type measuring technology has a plurality of advantages: the method can be used for static test to evaluate construction quality of newly built contact net engineering and dynamic test to monitor functional state of operation contact net facilities in real operation state; the geometric parameter of the overhead contact system has high detection precision, and the spatial relative position relation of two contact wires in the overhead contact system conversion structure such as an anchor section joint, an electric phase separation and the like can be accurately detected; the system has a simple structure, the dynamic performance of the pantograph in operation is not influenced, and the contact wire is not additionally disturbed, so that the measurement precision is not influenced; the equipment is located on the low-voltage side of the car roof, and is high in safety and far away from electromagnetic interference.
The non-contact detection technology of the contact net geometric parameters in the prior art mainly comprises a laser scanning ranging technology and a visual measurement technology based on optical imaging. The existing laser scanning ranging technology has the defects of low measuring speed, low mobile measuring precision, easiness in being influenced by environment and the reflectivity of the surface of a measured material and the like, and cannot meet the measuring requirements of high speed, high resolution and all weather. The existing visual measurement technology adopting the surface scanning camera is limited by various factors such as two-dimensional image resolution, large single-frame image data volume, image processing speed, easy occurrence of backlight and the like, and is difficult to meet the measurement requirements of high speed, high resolution and all weather.
The stereoscopic vision measurement is to acquire digital images of an object from different angles by adopting a plurality of cameras, and restore three-dimensional geometric information of the object based on the parallax principle. Different from the two-dimensional image output by the area array camera, the one-dimensional chip of the linear array camera outputs one-dimensional image information, and the three-dimensional image information has incomparable advantages of wide field of view, high resolution, high sampling frequency, small data volume and the like, and the three-dimensional vision measurement technology based on two or more linear array cameras is widely applied to the field of high-precision measurement.
One of the keys for detecting the geometrical parameters of the overhead line system based on the stereoscopic vision measurement technology is an active illumination light source. It is generally desirable that the brightness of the active illumination source be high so that the captured image has good signal-to-noise characteristics. The illumination light source suitable for the linear array camera at present mainly comprises a wired laser light source, a xenon light source and an LED light source. The line laser light source has higher cost, the line laser plane is required to be strictly overlapped with the line scanning plane of the line-scan camera, the installation precision is required to be harsh, and the laser light source has certain safety risk; the xenon light source has the defects of high power consumption, large volume, high temperature, short service life and the like; the LED light source adopted at present is a high-power normally-on LED light source, and because the exposure time of the camera is very short, the LED light source adopts a normally-on mode to generate larger electric energy waste, and meanwhile, the normally-on mode enables the LED light source chip to be in a working heating state for a long time, and the junction temperature of the LED light source chip caused by heat energy accumulation is too high, so that the actual service life of the LED light source chip is rapidly reduced.
Disclosure of Invention
In order to solve the problem that the service life of an active illumination light source in the conventional contact net geometric parameter detection device is shorter. The invention provides a contact net geometric parameter detection device, which adopts a mode of synchronizing linear array camera exposure and LED stroboscopic illumination, has high and uniform light supplementing brightness, remarkably improves image quality, greatly reduces system power consumption and greatly prolongs the service life of the contact net geometric parameter detection device.
The technical scheme adopted for solving the technical problems is as follows:
a catenary geometric parameter detection device, comprising:
the camera module can collect images of the contact net;
the light source module can provide active illumination for the contact net;
a synchronization control unit capable of controlling the camera module to periodically expose, controlling the light source module to periodically illuminate, and synchronizing the exposure of the camera module and the illumination of the light source module;
the sensor can measure the proceeding distance of the contact net geometric parameter detection device, and send the proceeding distance information of the contact net geometric parameter detection device to the synchronous control unit, and the synchronous control unit can control the exposure frequency of the camera module and the illumination frequency of the light source module according to the proceeding distance information.
The camera module comprises at least two linear array cameras, the light source module comprises at least one LED light source, all the linear array cameras and the LED light sources are located in the same vertical plane, and all the linear array cameras and the LED light sources are located on the same horizontal line.
The camera module comprises four linear array cameras, wherein the four linear array cameras are a first linear array camera, a second linear array camera, a third linear array camera and a fourth linear array camera respectively, the light source module comprises three LED light sources, the three LED light sources are a first LED light source, a second LED light source and a third LED light source respectively, the four linear array cameras and the three LED light sources are all located in the same vertical plane, and the first linear array camera, the first LED light source, the second linear array camera, the second LED light source, the third linear array camera, the third LED light source and the fourth linear array camera are orderly arranged at intervals along a horizontal line.
The sensor is the encoder, and this encoder sets up in the wheel of train, and this encoder can be with the rotation number of turns of this wheel send synchronous control unit, and synchronous control unit can be according to the exposure frequency of this rotation number of turns control camera module and the illumination frequency of light source module.
The strongest cross section of the light beam formed by each LED light source and the imaging chip of each linear array camera are positioned in the same vertical plane, and all the linear array cameras and the LED light sources are arranged on the same cross beam.
The linear array camera is connected with the synchronous control unit through the image acquisition card, the LED light source is connected with the synchronous control unit through the electric driving module, and the electric driving module is positioned in the train.
The LED light source comprises a beam shaping device, the emitting direction of the LED light source is upward, the beam shaping device can enable a graph obtained by cutting a beam emitted by the LED light source by a horizontal plane to be elliptical, and the minor axis of the ellipse is parallel to the travelling direction of the contact net geometric parameter detection device.
The LED light source is a white light LED light source, the camera module comprises a broadband pass filter, the wavelength range of the broadband pass filter can cover the spectrum range of the white light LED light source, the wavelength range of the broadband pass filter corresponds to the response wavelength range of the chip of the linear array camera, and the broadband pass filter can filter short-wavelength invisible light and long-wavelength invisible light.
The LED light source is a monochromatic LED light source, the camera module comprises a narrow-band pass filter, the wavelength range of the narrow-band pass filter can cover the spectrum range of the monochromatic LED light source, the spectrum range of the monochromatic LED light source and the wavelength range of the narrow-band pass filter are both within the response wavelength range of the chip of the linear array camera, and the narrow-band pass filter can filter invisible light and visible light outside the spectrum range of the monochromatic LED light source.
A temperature sensor is arranged in the LED light source and is connected with the electric driving module, and when the internal temperature of the LED light source exceeds a set first critical value, the electric driving module can reduce the power of the LED light source by reducing the current output; when the internal temperature of the LED light source exceeds a set second critical value, the electric driving module can stop the LED light source to emit light by turning off the current output, and the second critical value is larger than the first critical value.
The beneficial effects of the invention are as follows:
firstly, an LED synchronous stroboscopic lighting method for measuring geometrical parameters of the overhead line system is established, and the linear array camera module and the LED light source module are synchronously triggered by the same pulse signal, so that synchronous exposure of the camera and synchronous stroboscopic lighting of the light source are realized. The design method effectively solves the problem of larger electric energy waste of the LED light source in the normal-brightness working mode, can provide instantaneous high-brightness illumination required by shooting of the linear array camera, and can greatly reduce the power consumption of the detection device. The synchronous stroboscopic working mode enables the LED light source chip to be in an instantaneous working heating state, and the LED light source chip is in a non-working state most of the time due to the short exposure time of the camera, so that heat energy accumulation can be greatly reduced, the junction temperature of the LED light source chip is prevented from being too high, and the actual service life of the LED light source chip is effectively ensured.
Secondly, one or more LED light sources and the linear array camera module are arranged in a linear mode, the strongest cross section of the light beam formed by the LED light source module and the imaging chip of the linear array camera are positioned on the same plane, and meanwhile, the light beam is shaped in a strip shape along the arrangement direction of the linear array camera by adopting light beam shaping, so that the illumination brightness in the space range of the contact net is uniform. The signal-to-noise characteristics of the image acquired by the linear array camera are further improved by arranging the wide band-pass filter to filter short wavelength and long wavelength invisible light.
In two aspects, the invention provides the contact net geometric parameter detection device with low power consumption, good lighting effect and high reliability.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
Fig. 1 is a schematic diagram of a contact net geometric parameter detection device.
Fig. 2 is a schematic structural diagram of a contact net geometric parameter detection device.
Fig. 3 is a schematic diagram of another contact net geometric parameter detection device.
Fig. 4 is a schematic structural diagram of another contact net geometric parameter detecting device.
Fig. 5 is a schematic view of the direction a in fig. 4.
Fig. 6 is a schematic diagram of a beam after the beam shaping device shapes the LED light source.
1. A camera module; 2. a light source module; 3. a synchronization control unit; 4. a sensor; 5. an image acquisition card; 6. an electrical drive module; 7. a cross beam;
11. a first line camera; 12. a second line camera; 13. a third linear array camera; 14. a fourth linear array camera;
21. a first LED light source; 22. a second LED light source; 23. a third LED light source; 24. light spots.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
A catenary geometric parameter detection device, comprising:
a camera module 1 capable of capturing images of the catenary;
the light source module 2 can provide active illumination for the contact net;
a synchronization control unit 3 that can control the periodic exposure of the camera module 1, can control the periodic illumination of the light source module 2, and can also synchronize the periodic exposure of the camera module 1 and the periodic illumination of the light source module 2;
the sensor 4 can measure the running distance of the contact net geometric parameter detection device, and send the running distance information of the contact net geometric parameter detection device to the synchronous control unit 3, and the synchronous control unit 3 can control the exposure frequency of the camera module 1 and the illumination frequency of the light source module 2 according to the running distance information, as shown in fig. 1 to 4.
In the present invention, the light source module 2 is lighted once every other cycle, and the overhead line system is lighted. The camera module 1 exposes once every other period and collects the image of the contact net. The illumination of the light source module 2 is performed simultaneously with the exposure of the camera module 1, and the camera module 1 and the light source module 2 are synchronously triggered by the same pulse signal, so that synchronous exposure of the camera and synchronous stroboscopic illumination of the light source are realized, namely, when the camera module 1 is exposed and shot, the light source module 2 emits light and illuminates simultaneously; when the camera module 1 does not perform exposure shooting, the light source module 2 does not emit light and illuminate, and the exposure of the camera module 1 is synchronous with the illumination of the light source module 2. The sensor 4 generates pulse signals, and two or more paths of synchronous pulse signals are generated through the synchronous control unit 3 to synchronously trigger the exposure of the camera module 1 and the stroboscopic illumination of the light source module 2.
In the present embodiment, a line camera is used in the camera module 1, that is, the camera module 1 includes at least two line cameras. The light source module 2 employs an LED light source, that is, the light source module 2 includes at least one LED light source. All the linear cameras and the LED light sources are located in the same vertical plane, and the camera module 1 and the light source module 2 are arranged in a linear mode, namely all the linear cameras and the LED light sources are located on the same horizontal line. All the linear array cameras and the LED light sources are uniformly distributed at different positions on the same plane, and the fields of view of all the linear array cameras can respectively cover the space range of the contact line.
Specifically, the camera module 1 may include two line cameras, which are a first line camera 11 and a second line camera 12, the light source module 2 includes an LED light source, the two line cameras and the LED light source are all located in the same vertical plane, and the first line camera 11, the light source module 2, and the second line camera 12 are sequentially arranged at intervals along a horizontal line, as shown in fig. 2. The camera module 1 and the light source module 2 face towards the contact net, and the first linear array camera 11 and the second linear array camera 12 are mirror images of each other at the left side and the right side of the light source module 2.
Alternatively, the camera module 1 may also include four line cameras, which are the first line camera 11, the second line camera 12, the third line camera 13, and the fourth line camera 14, respectively, and the light source module 2 includes three LED light sources, which are the first LED light source 21, the second LED light source 22, and the third LED light source 23, respectively, and the four line cameras and the three LED light sources are all located in the same vertical plane, and the first line camera 11, the first LED light source 21, the second line camera 12, the second LED light source 22, the third line camera 13, the third LED light source 23, and the fourth line camera 14 are sequentially arranged at intervals along one horizontal line, as shown in fig. 4.
The first and fourth line cameras 11 and 14 are mirror images of each other on the left and right sides of the second LED light source 22, the first and third LED light sources 21 and 23 are mirror images of each other on the left and right sides of the second LED light source 22, and the second and third line cameras 12 and 13 are mirror images of each other on the left and right sides of the second LED light source 22. The strongest cross section of the light beam formed by the first LED light source 21, the second LED light source 22 and the third LED light source 23 is in the same vertical plane as the imaging chips of the first line camera 11, the second line camera 12, the third line camera 13 and the fourth line camera 14. Preferably, the first line camera 11, the first LED light source 21, the second line camera 12, the second LED light source 22, the third line camera 13, the third LED light source 23 and the fourth line camera 14 may be mounted on the same side of the same beam 7 to achieve a coplanar arrangement, as shown in fig. 5.
In this embodiment, the sensor 4 is an encoder, the encoder is disposed on a wheel or an axle of a train, the encoder can measure a rotation number of the wheel, the encoder can send the rotation number of the wheel to the synchronous control unit 3, and the synchronous control unit 3 can calculate the running speed and the running distance of the contact net geometric parameter detection device according to the rotation number of the wheel, the outer diameter of the wheel and the time corresponding to the rotation number. The synchronization control unit 3 can control the exposure frequency of the camera module 1 and the illumination frequency (blinking frequency) of the light source module 2 according to the running speed and the running distance. For example, the exposure frequency of the camera module 1 and the illumination frequency of the light source module 2 may be set in the synchronous control unit 3 to be 4-8 times/m (such that the typical strobe frequency on a 360km/h motor train unit platform is 400 Hz-800 Hz, which is much higher than the working frequency of other current bow-net image photographing devices (such as the typical photographing frequency of a high-definition imaging device of a catenary suspension device is about 1 Hz-5 Hz), and the frequency of the camera module 1 and the illumination of the light source module 2 are simultaneously and synchronously performed, as shown in fig. 3.
In this embodiment, the contact net geometric parameter detection device may further include an image acquisition card 5 and an electrical driving module 6, wherein the led light source is driven by a constant current source, and the electrical driving module 6 is located in the vehicle. The linear array camera is connected with the synchronous control unit 3 through the image acquisition card 5, and the LED light source is connected with the synchronous control unit 3 through the electric driving module 6. The catenary image acquired by the camera module 1 should be received by the image acquisition card 5, and the image processing and calculation of the catenary geometric parameters should be performed by the data processing unit comprising the image acquisition card 5.
In this embodiment, the LED light source includes a beam shaping device, which may be a lens or a reflective lamp cup, where the emission direction of the LED light source is upward, the LED light source is mounted on the top of the train, the LED light source can illuminate the overhead line above the train, and the beam shaping device can make a pattern (light spot 24) obtained by cutting the light beam emitted by the LED light source by a horizontal plane be elliptical, and the minor axis of the ellipse is parallel to the travelling direction of the overhead line geometric parameter detecting device, as shown in fig. 6, the major axis X of the ellipse corresponds to the left-right direction in fig. 5, and the minor axis Y of the ellipse corresponds to the up-down direction in fig. 5.
In this embodiment, the LED light source may be a white LED light source, that is, the LED light source emits white light, and a broadband pass filter is disposed in front of the camera module 1, where the broadband pass filter can cover a main spectrum range of the white LED light source and is adapted to a main response wavelength range of a chip of the line camera, and is used to filter short wavelength invisible light and long wavelength invisible light.
In this embodiment, the LED light source may also be a single-color LED light source, that is, a single-color light emitted by the LED light source, where the camera module 1 includes a narrow-band pass filter, and the wavelength range of the narrow-band pass filter can cover the spectrum range of the single-color LED light source, and the spectrum range of the single-color LED light source and the wavelength range of the narrow-band pass filter are both within the response wavelength range of the chip of the line camera, and the narrow-band pass filter can filter out invisible light and visible light outside the spectrum range of the single-color LED light source. When the LED light source adopts a monochromatic LED light source, the image signal-to-noise characteristic of the linear array camera is further obviously improved, the sunlight interference resistance is obviously improved, and the consistency of the contact network images photographed at daytime and night is better.
In this embodiment, the light source module 2 has a temperature protection function, a temperature sensor is disposed in the LED light source, the temperature sensor can measure the internal temperature of the LED light source, the temperature sensor is connected with the electric driving module 6, and when the internal temperature of the LED light source exceeds a set first critical value, the electric driving module 6 can reduce the power of the LED light source by reducing the current output.
In this embodiment, when the internal temperature of the LED light source exceeds a set second critical value, the electrical driving module 6 can stop the LED light source from emitting light by turning off the current output, and the second critical value is greater than the first critical value, so as to further protect the LED light source.
Firstly, the invention establishes the LED synchronous stroboscopic lighting method for measuring the geometrical parameters of the overhead line system, and the linear array camera module and the LED light source module are synchronously triggered by the same pulse signal, so that the synchronous exposure of the camera and the synchronous stroboscopic lighting of the light source are realized. The method effectively solves the problem of larger electric energy waste of the LED light source in the normal-brightness working mode, can provide instant high-brightness illumination required by shooting of the linear array camera, and can greatly reduce the power consumption of the detection device. The synchronous stroboscopic working mode enables the LED light source chip to be in an instantaneous working heating state, and the LED light source chip is in a non-working state most of the time due to the short exposure time of the camera, so that heat energy accumulation can be greatly reduced, the junction temperature of the LED light source chip is prevented from being too high, and the actual service life of the LED light source chip is effectively ensured.
Secondly, one or more LED light sources and the linear array camera module are arranged in a linear mode, the strongest cross section of the light beam formed by the LED light source module and the imaging chip of the linear array camera are positioned on the same plane, and meanwhile, the light beam is shaped in a strip shape along the arrangement direction of the linear array camera by adopting light beam shaping, so that the illumination brightness in the space range of the contact net is uniform. The signal-to-noise characteristics of the image acquired by the linear array camera are further improved by arranging the wide band-pass filter to filter short wavelength and long wavelength invisible light.
In two aspects, the invention provides the contact net geometric parameter detection device with low power consumption, good lighting effect and high reliability.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing description of the embodiments of the invention is not intended to limit the scope of the invention, so that the substitution of equivalent elements or equivalent variations and modifications within the scope of the invention shall fall within the scope of the patent. In addition, the technical characteristics and technical scheme, technical characteristics and technical scheme can be freely combined for use.
Claims (1)
1. The utility model provides a contact net geometric parameters detection device which characterized in that, contact net geometric parameters detection device includes:
a camera module (1) capable of capturing images of the catenary;
the light source module (2) can provide active illumination for the contact net;
a synchronization control unit (3) that can control the periodic exposure of the camera module (1), can control the periodic illumination of the light source module (2), and can synchronize the exposure of the camera module (1) and the illumination of the light source module (2);
the sensor (4) can measure the proceeding distance of the contact net geometric parameter detection device and send the proceeding distance information of the contact net geometric parameter detection device to the synchronous control unit (3), and the synchronous control unit (3) can control the exposure frequency of the camera module (1) and the illumination frequency of the light source module (2) according to the proceeding distance information;
the camera module (1) emits light and illuminates at the same time when exposing and shooting; the camera module (1) does not emit light and illuminate when not exposing shooting, and the light source module (2) does not emit light and illuminate; the exposure frequency of the camera module (1) and the illumination frequency of the light source module (2) are 4-8 times/meter;
the camera module (1) comprises four linear array cameras, the four linear array cameras are respectively a first linear array camera (11), a second linear array camera (12), a third linear array camera (13) and a fourth linear array camera (14), the light source module (2) comprises three LED light sources, the three LED light sources are respectively a first LED light source (21), a second LED light source (22) and a third LED light source (23), the four linear array cameras and the three LED light sources are all positioned in the same vertical plane, and the first linear array camera (11), the first LED light source (21), the second linear array camera (12), the second LED light source (22), the third linear array camera (13), the third LED light source (23) and the fourth linear array camera (14) are sequentially arranged at intervals along a horizontal line;
the first linear array camera (11) and the fourth linear array camera (14) are mirror images of each other at the left side and the right side of the second LED light source (22), the first LED light source (21) and the third LED light source (23) are mirror images of each other at the left side and the right side of the second LED light source (22), and the second linear array camera (12) and the third linear array camera (13) are mirror images of each other at the left side and the right side of the second LED light source (22);
the strongest cross section of the light beam formed by each LED light source and the imaging chip of each linear array camera are positioned in the same vertical plane, and all the linear array cameras and the LED light sources are arranged on the same cross beam (7);
the LED light source comprises a beam shaping device, the emitting direction of the LED light source is upward, the beam shaping device can enable a graph obtained by cutting a beam emitted by the LED light source by a horizontal plane to be elliptical, and the minor axis of the ellipse is parallel to the travelling direction of the contact net geometric parameter detection device;
the LED light source is a single-color LED light source, the camera module (1) comprises a narrow-band pass filter, the wavelength range of the narrow-band pass filter can cover the spectrum range of the single-color LED light source, the spectrum range of the single-color LED light source and the wavelength range of the narrow-band pass filter are both in the response wavelength range of a chip of the linear array camera, and the narrow-band pass filter can filter invisible light and visible light outside the spectrum range of the single-color LED light source;
the sensor (4) is an encoder, the encoder is arranged on a wheel of a train, the encoder can send the rotation number of the wheel to the synchronous control unit (3), and the synchronous control unit (3) can control the exposure frequency of the camera module (1) and the illumination frequency of the light source module (2) according to the rotation number;
the linear array camera is connected with the synchronous control unit (3) through the image acquisition card (5), the LED light source is connected with the synchronous control unit (3) through the electric driving module (6), and the electric driving module (6) is positioned in the train;
a temperature sensor is arranged in the LED light source and is connected with an electric driving module (6), and when the internal temperature of the LED light source exceeds a set first critical value, the electric driving module (6) can reduce the power of the LED light source by reducing the current output; when the internal temperature of the LED light source exceeds a set second critical value, the electric drive module (6) can stop the LED light source to emit light by turning off the current output, and the second critical value is larger than the first critical value.
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| CN112770043B (en) * | 2019-11-06 | 2022-09-13 | 中国铁道科学研究院集团有限公司 | Bow net video acquisition device and bow net video processing system |
| CN113037434B (en) * | 2019-12-26 | 2022-04-15 | 深圳市瑞立视多媒体科技有限公司 | Method and related equipment for solving synchronous communication packet loss of coding type active optical capturing system |
| CN111327836B (en) | 2020-03-20 | 2021-06-25 | 合肥埃科光电科技有限公司 | Camera exposure processing method and system |
| CN113701628A (en) * | 2021-08-20 | 2021-11-26 | 中国铁道科学研究院集团有限公司 | Dynamic measuring method and device for contact line abrasion |
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