Automatic calibration system for photoelectric deflectometer

Abstract

The utility model provides a photoelectric deflectometer automatic calibration system, which comprises a photoelectric deflectometer, a time service device and a plurality of target mounting plates, the photoelectric deflectometer and the time service device are both connected with a gateway controller, the target mounting plates are connected to a bridge through a mounting bracket, one surface of each target mounting plate is connected with a guide rail, a plurality of positioning pins are arranged on the guide rail, and the positioning pins are connected with the gateway controller. The guide rail is slidably connected with the infrared target, a driving device is arranged on the target mounting plate and used for driving the infrared target to move along the guide rail, and the gateway controller is used for controlling the driving device. By arranging the time service device and the gateway controller, the signal sending time of a plurality of systems can be unified conveniently, so that the automatic calibration system of the photoelectric deflectometer can be linked with other monitoring systems in bridge safety monitoring, and the monitoring accuracy is guaranteed; by arranging a plurality of positioning pins on the guide rail, the movement of the infrared target can be limited by adopting a simple and convenient method, so that the infrared target moves according to a specified distance during each calibration.

Description

Technical Field

[0001] The utility model relates to the technical field of monitoring, in particular to an automatic calibration system for a photoelectric deflectometer. Background Art

[0002] With the rapid development of my country's transportation facilities, the construction and use of bridges have increased sharply. With the increase in traffic load and the increase in service life, the safety of bridges has received more and more attention from relevant management departments and technical units.

[0003] Deflection monitoring is an important project in bridge safety monitoring. Traditional manual methods and automated monitoring methods are difficult to meet current needs. Therefore, in recent years, systems using the deflection monitoring principle of camera image recognition technology have been applied, such as photoelectric deflectometers, machine vision deformation measurement systems and other products, which are widely used for their high accuracy and fast response speed. When used for the first time, they are calibrated by installing distance or standard size rulers. However, during operation, the automatic calibration function cannot be realized.

[0004] To achieve calibration, existing solutions usually use a test stand to push the target to move, simulate the change in displacement during the calibration process, and use a servo motor to push the target. The displacement distance lacks precise control, and there is an error in the displacement amount when only controlling the motor, so the calibration is not accurate enough. In addition, the deflectometer is often not used independently in the monitoring system, and lacks accurate synchronous control when used in conjunction with multiple systems. Utility Model Content

[0005] In view of the deficiencies in the prior art, the purpose of the utility model is to provide an automatic calibration system for a photoelectric deflectometer, aiming to solve the problems in the prior art of lack of accuracy in the automatic calibration of the photoelectric deflectometer and lack of accurate synchronous control in the linkage of multiple systems.

[0006] In order to achieve the above purpose, the utility model is implemented through the following technical solutions:

[0007] A photoelectric deflectometer automatic calibration system comprises a photoelectric deflectometer, a timing device and a plurality of target mounting plates, wherein the photoelectric deflectometer and the timing device are both connected to a gateway controller, the target mounting plate is connected to a bridge via a mounting bracket, one side of the target mounting plate is connected to a guide rail, a plurality of positioning pins are arranged on the guide rail, the guide rail is slidably connected to an infrared target, a driving device is arranged on the target mounting plate, the driving device is used to drive the infrared target to move along the guide rail, and the gateway controller is used to control the driving device.

[0008] Compared with the prior art, the beneficial effects of the utility model are: by setting the timing device and the gateway controller, it is convenient to unify the signal sending time of multiple systems, so that the automatic calibration system of the photoelectric deflectometer can be linked with other monitoring systems in bridge safety monitoring to ensure the accuracy of monitoring; by setting a plurality of the positioning pins on the guide rail, a simple method can be used to limit the movement of the infrared target, so that the infrared target moves according to the specified distance each time calibration is performed, and is not affected by the installation of driving devices such as motors. The automatic calibration system of the photoelectric deflectometer has precise calibration performance and the flexibility to adapt to the linkage of multiple systems.

[0009] Furthermore, a camera lens is provided on the photoelectric deflectometer, and the guide rail is located on a side of the target mounting plate facing the camera lens.

[0010] Furthermore, the driving device includes a motor controller and a plurality of motors, and the plurality of motors are all connected to the motor controller.

[0011] Furthermore, the infrared target includes a target surface and a bracket, the bracket is slidably connected to the guide rail, and one end of the bracket facing away from the guide rail is connected to the target surface.

[0012] Furthermore, a plurality of the motors are connected to the bracket.

[0013] Furthermore, the gateway controller is connected to a plurality of the motor controllers via a control signal line.

[0014] Furthermore, the guide rail includes a plurality of sub-guide rails and a starting point, one end of each of the plurality of sub-guide rails is connected to the starting point, and one end of the bracket facing away from the target surface is adapted to the starting point.

[0015] Furthermore, the sub-guide rail is connected to the positioning pin, and the positioning pin is located at an end of the sub-guide rail facing away from the starting point. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the automatic calibration system of the photoelectric deflectometer in the embodiment of the utility model;

[0017] Figure 2 It is a schematic diagram of the partially disassembled structure of the automatic calibration system of the photoelectric deflectometer in the embodiment of the utility model;

[0018] Description of main component symbols:

[0019]

[0020]

[0021] The following specific implementation manner will further illustrate the present utility model in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0022] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0023] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0025] See also Figure 1 and Figure 2The photoelectric deflectometer automatic calibration system in the embodiment of the utility model includes a photoelectric deflectometer 100, a timing device 300 and a plurality of target mounting plates 400. The photoelectric deflectometer 100 and the timing device 300 are both connected to a gateway controller 200. A camera lens 110 is arranged on the photoelectric deflectometer 100. The target mounting plate 400 is connected to a bridge 600 through a mounting bracket 401. One side of the target mounting plate 400 is connected to a guide rail 410. The guide rail 410 is located on a side of the target mounting plate 400 facing the camera lens 110. A plurality of positioning pins 411 are arranged on the guide rail 410. The guide rail 410 is slidably connected to an infrared Target, the infrared target includes a target surface 500 and a bracket 510, the bracket 510 is slidably connected to the guide rail 410, the end of the bracket 510 facing away from the guide rail 410 is connected to the target surface 500, the guide rail 410 includes a plurality of sub-guide rails and a starting point, one end of the plurality of sub-guide rails are connected to the starting point, the end of the bracket 510 facing away from the target surface 500 is adapted to the starting point, the sub-guide rail is connected to the positioning pin 411, the positioning pin 411 is located at the end of the sub-guide rail facing away from the starting point, a driving device is arranged on the target mounting plate 400, and the driving device is used to drive the infrared target to move along the guide rail 410. Preferably, the timing device 300 is a Beidou timing device, which obtains satellite timing to obtain accurate system time, provides time for multi-system synchronization so as to synchronize trigger signals, and the mounting bracket 401 is installed at the belly measurement point of the bridge 600. The starting point is located at the center of the target mounting plate 400. The number of sub-guide rails is 4, and they are connected to the starting point to form a cross shape. Several sub-guide rails are of equal length. Before calibration, the infrared target is located at the starting point, that is, the bracket 510 is located on the starting point. At this time, the initial measurement value of the infrared target is recorded. During the calibration process, the infrared target is moved to the positioning pin 411 through the cooperation of the driving device and the sub-guide rail. At the point, strict limiting is completed by the positioning pin 411, even if the distance moved by the infrared target is fixed and known, specifically, the distances between several positioning pins 411 and the starting point are equal, which is 15 cm. The calibration value is measured after the movement is completed. Since there are multiple sub-guide rails, calibration values ​​for displacement in multiple directions can be obtained. Different displacement values ​​correspond to different calibration values. The calibration coefficient can be calculated based on the measurement initial value, several calibration values ​​and several displacement values. Subsequently, the calibration coefficient is used to calibrate the target point data. It can be understood that the calibration process can be completed through remote control, and the calibration is accurate, avoiding calibration errors caused by the uncertainty and unclearness of the actual displacement distance.

[0026] The driving device includes a motor controller 420 and a plurality of motors 421 , wherein the plurality of motors 421 are connected to the bracket 510 , and the plurality of motors 421 are connected to the motor controller 420 . The gateway controller 200 is used to control the driving device. Specifically, the gateway controller 200 is connected to the plurality of motor controllers 420 via a control signal line 210 . Preferably, the motor 421 is a stepper motor, which is set in number of 2 and is respectively close to one end of the two mutually perpendicular sub-guide rails away from the starting point. The motor 421 is connected to the bracket 510 through a rack. The rack has a certain rigidity and can pull the bracket 510 in or push it away relative to the motor 421, so that the bracket 510 can be moved to any position on the cross-shaped guide rail 410. The gateway controller 200 can read instructions and send signals through serial port communication. The control signal line 210 is an RS485 communication line. It can be understood that the gateway controller 200 can cooperate with the timing device 300 to obtain accurate satellite timing and unify the system time for multi-system joint monitoring, and can complete the synchronous signal triggering to make the bridge safety monitoring more accurate.

[0027] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0028] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. An automatic calibration system for a photoelectric deflectometer, characterized in that: It includes a photoelectric deflectometer, a timing device and several target mounting plates, the photoelectric deflectometer and the timing device are both connected to a gateway controller, the target mounting plate is connected to the bridge through a mounting bracket, one side of the target mounting plate is connected to a guide rail, a plurality of positioning pins are arranged on the guide rail, the guide rail is slidably connected to an infrared target, a driving device is arranged on the target mounting plate, the driving device is used to drive the infrared target to move along the guide rail, and the gateway controller is used to control the driving device.

2. The photoelectric deflectometer automatic calibration system according to claim 1, characterized in that: A camera lens is arranged on the photoelectric deflectometer, and the guide rail is located on a side of the target mounting plate facing the camera lens.

3. The automatic calibration system for photoelectric deflectometer according to claim 1, characterized in that: The driving device comprises a motor controller and a plurality of motors, and the plurality of motors are all connected to the motor controller.

4. The automatic calibration system for photoelectric deflectometer according to claim 3, characterized in that: The infrared target comprises a target surface and a bracket. The bracket is slidably connected to the guide rail, and one end of the bracket facing away from the guide rail is connected to the target surface.

5. The automatic calibration system for photoelectric deflectometer according to claim 4, characterized in that: A plurality of the motors are connected to the bracket.

6. The automatic calibration system for photoelectric deflectometer according to claim 3, characterized in that: The gateway controller is connected to a plurality of the motor controllers via a control signal line.

7. The automatic calibration system for photoelectric deflectometer according to claim 4, characterized in that: The guide rail comprises a plurality of sub-guide rails and a starting point, one end of each of the plurality of sub-guide rails is connected to the starting point, and one end of the bracket facing away from the target surface is adapted to the starting point.

8. The automatic calibration system for photoelectric deflectometer according to claim 7, characterized in that: The sub-guide rail is connected to the positioning pin, and the positioning pin is located at an end of the sub-guide rail facing away from the starting point.

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