Optical photographic deformation measurement synchronous control device and method

Abstract

The application discloses an optical photography deformation measurement synchronous control device and method, which comprises a multi-camera synchronous trigger device, a measurement field construction device, measurement data preprocessing and a centralized control method, wherein the multi-camera synchronous trigger device realizes full-automatic data acquisition control of the camera through multi-channel timing interval TTL level triggering; the measurement field device combines with the camera measurement field of view requirement, adopts a gantry cantilever turntable and a camera bearing turntable, and constructs an optimal photography measurement field through joint control of the camera revolution and rotation; and the measurement data preprocessing is based on the measurement field construction mode to realize automatic data segmentation and data sample establishment, and to establish an optimal measurement data unit. The method has high reliability, long continuous working time, greatly improved measurement data processing speed and precision, and can provide effective technical equipment and means for automatic control of large structure photography deformation measurement in the military and civilian industries.

Description

Technical Field

[0001] This invention belongs to the field of spacecraft ground testing and experimentation technology, specifically relating to a synchronous control device and method for optical photography deformation measurement in experiments. Background Technology

[0002] In spacecraft and other military product testing, structural deformation measurement is a crucial test parameter. Currently, commonly used structural deformation measurement methods in the military industry include strain sensing, fiber optic measurement, and optical photogrammetry. Optical photogrammetry, with its non-contact nature, ability to measure multiple points, and high accuracy, is widely used in spacecraft structural deformation measurement applications.

[0003] With the increasing size and complexity of product structures and the growing measurement requirements, traditional single-device, manual deformation measurement field construction, and manual data acquisition methods are no longer sufficient to meet the large-scale, short-cycle, high-precision, and long-term measurement needs of large spacecraft structural deformation. Summary of the Invention

[0004] The purpose of this invention is to provide a synchronous control device for optical photographic deformation measurement. Through the design and control of the camera automatic triggering device and the measurement field device, it is possible to achieve highly reliable and fully automated control of the construction of optimal deformation measurement fields for multiple cameras and the adjustable measurement data parameters.

[0005] This invention is achieved through the following technical solution:

[0006] An optical photographic distortion measurement synchronous control device, comprising:

[0007] A measurement field construction device includes a gantry and a rotatable cross beam, the rotatable cross beam being disposed on the top of the gantry and configured to rotate about an axis perpendicular to the ground, and a camera being disposed at the end of the rotatable cross beam;

[0008] The front-end device includes the camera and a power system for rotating the rotatable cross beam;

[0009] A multi-camera synchronous triggering device is used to control the front-end equipment to achieve synchronous data acquisition.

[0010] Furthermore, the measurement field construction device also includes a rotating turntable, on which the camera is mounted to the rotatable cross beam via the rotating turntable, and the rotating turntable can drive the camera to rotate around the camera's shooting direction axis; the front-end equipment also includes a power system for controlling the rotation of the rotating turntable.

[0011] Furthermore, the rotatable cross beam consists of two vertical beams, with a camera mounted at each of its four vertices.

[0012] Furthermore, the rotatable cross beam and the rotating turntable are automatically linked, and the measurement field construction is fully automated through the combination of rotation speed ratios, thereby improving the system reliability.

[0013] Furthermore, the rotatable cross beam is equipped with a starting limiter. The rotatable cross beam starts timing from the starting point and stops when it reaches the end point. After waiting for the timer to reach the cycle time, it starts to rotate, thereby eliminating the accumulated error of the cantilever angle caused by the speed error of the motor during long-term reciprocating motion.

[0014] Furthermore, a blank area is provided at the end of the stroke of the rotatable cross beam.

[0015] The blank area is implemented by combining physical structure with program settings. The method involves reserving a 5-10 degree angular space at the endpoint when setting the motion range in the program. For example, if the motion cycle is selected as 360 seconds (i.e., a rotation speed of 1° / s), the motion range is set to 0-355°. The cantilever moves 355° and then stops. It begins to rotate again when the timer reaches 360 seconds. The purpose of the blank area is to utilize the high precision of the software program's timing to eliminate the accumulation of errors in the hardware motor's motion, ensuring that each cycle time is a fixed value.

[0016] Furthermore, the multi-camera synchronous triggering device includes a remote master station and a slave station, which are connected for communication. The remote master station is a centralized control device. By default, the remote master station issues commands, which are forwarded by the slave station to control the front-end device to complete the shooting. When the communication between the remote master station and the slave station is interrupted, the system automatically switches to the slave station directly controlling the front-end device to complete the shooting. Alternatively, the system can be manually switched to the slave station controlling the front-end device to synchronously control the image acquisition of multiple cameras as needed.

[0017] A synchronous control method for optical photographic distortion measurement, based on the aforementioned synchronous control device for optical photographic distortion measurement, specifically includes:

[0018] By setting the angular velocity of the suspended beam motion, the construction cycle of the measurement field can be further adjusted; at the same time, the coverage coefficient of the measurement field of view can be further improved, thereby enhancing data validity and data quality.

[0019] Measurement data preprocessing involves automatic data segmentation and data sample establishment based on measurement field parameters to achieve the establishment of optimal measurement data units;

[0020] The measurement field parameters include the measurement period and the measurement start time. Based on the measurement period, the data preprocessing software determines the segmentation duration of the camera measurement data packets.

[0021] Centralized control enables human-computer interaction for synchronous control of camera deformation measurement. Through the design and control of the multi-camera synchronous triggering device and the measurement field construction device, highly reliable and fully automated control of the construction of optimal deformation measurement fields for multiple cameras and the adjustable measurement data parameters are achieved.

[0022] Furthermore, the measurement data preprocessing specifically involves preprocessing the system measurement data according to the preset optimal measurement field measurement cycle. This means merging and grouping the measurement image data from multiple cameras within the same measurement cycle time period to form a data packet for each measurement cycle, thereby improving the processing speed for subsequent accuracy analysis of the measurement data.

[0023] Furthermore, the centralized control specifically involves centrally setting the multi-camera synchronous triggering device, the measurement field construction device, and the data preprocessing cycle to achieve one-click synchronous start and stop of the above devices and data processing, thereby maximizing the ease of operation of the deformation measurement synchronous control device and reducing measurement data errors caused by asynchronous start of different devices.

[0024] This invention proposes a synchronous control device and method for optical photographic deformation measurement, which meets the deformation measurement requirements of large spacecraft structures. By automating the construction of the deformation measurement field and the acquisition of camera measurement data, it expands the deformation measurement field of view and increases the deformation measurement frequency, enabling long continuous working time. Furthermore, by combining it with data preprocessing and centralized linkage control methods, it achieves high reliability of high-precision measurement data, greatly improving the intelligence level of optical photographic deformation measurement and significantly enhancing the accuracy of measurement data processing. It can provide effective technical equipment and means for the automated control of large-scale structural photographic deformation measurement in military and civilian industries. Attached Figure Description

[0025] Figure 1 This is a control architecture diagram of the optical photographic deformation measurement synchronous control device of the present invention.

[0026] Figure 2 This is a diagram of the measurement field construction device of the optical photographic deformation measurement synchronous control device of the present invention;

[0027] Figure 3 This is a schematic diagram of the centralized control principle of the optical photographic distortion measurement synchronous control device of the present invention;

[0028] Figure 4 This is the human-computer interaction interface of the optical photographic deformation measurement synchronous control device of the present invention. Detailed Implementation

[0029] The following describes specific embodiments of the content described in this invention, further clarifying the content of this invention through these specific embodiments. Of course, the following specific embodiments are merely illustrative of different aspects of this invention and should not be construed as limiting the scope of this invention.

[0030] Figure 1 The control architecture diagram of the optical photographic deformation measurement synchronous control device is shown below. Figure 1 As shown, the control architecture adopts a master-slave dual-redundancy architecture. The master control software and the camera client program together constitute the master station software. Each camera workstation is configured with one camera HttpServer program as the slave station software. By default, the master station software distributes control commands to the camera HttpServer program through the camera client program. When the communication between the camera client program and the camera HttpServer program fails, the communication between the master station software and the slave station software is interrupted. The camera HttpServer program can automatically switch to slave control mode, autonomously control the front-end optical camera equipment, and is not controlled by the master station. It also saves the measurement data to the slave station. Through the above-mentioned redundant architecture design, the system stability is guaranteed to the maximum extent.

[0031] Figure 2 A diagram illustrating the measurement field construction device for a synchronous control system for optical photographic deformation measurement, as shown below. Figure 2 As shown, the measurement field construction device consists of a gantry support, a cross beam, and a camera-supporting turntable. The gantry support provides the field of view height for the large-scale structural space of the camera measurement field. The cross beam is used to suspend four camera turntables. By adjusting the rotational angular velocity of the cross beam, the construction time of the entire measurement field under the minimum rotation angle condition can be controlled, that is, the measurement cycle of deformation measurement data can be adjusted by adjusting the revolution speed. The camera turntable is the camera rotation support device. The rotation direction of the turntable is perpendicular to the shooting direction, which further improves the coverage coefficient of the measurement field of view and the validity and quality of the data.

[0032] Figure 3 This is a schematic diagram of the centralized control principle of the optical photographic deformability measurement synchronous control device, such as... Figure 3 As shown, the centralized control software is responsible for the linkage control of the camera data acquisition software, the camera revolution mechanism, and multiple camera rotation mechanisms. Through multi-mode matching of camera triggering, camera measurement field rotation speed, and revolution speed, it can meet the test requirements of different structural deformation measurement objects, different measurement cycles, and measurement accuracies, and can realize fully automated operation of structural deformation measurement.

[0033] Figure 4 For the human-machine interface of the optical photographic deformation measurement synchronous control device, such as Figure 4As shown, the human-machine interface is designed with functions for setting camera trigger control mode, data preprocessing cycle, camera revolution and rotation control. For the cantilever revolution requirement, multiple typical stroke cycle modes are set. By using a stroke cycle timer, the accumulated errors in time and angle caused by long-term continuous movement are avoided. The human-machine interaction performance is enhanced by dynamically displaying the current trigger mode, cantilever motion status information and position. This synchronous control device has independent control and one-button linkage control, which can meet the application needs of multiple scenarios such as test debugging and different test conditions.

[0034] Although the specific embodiments of the present invention have been described and illustrated above, it should be noted that various equivalent changes and modifications can be made to the above embodiments based on the concept of the present invention. As long as the resulting functions do not exceed the spirit covered by the specification and drawings, they should be within the protection scope of the present invention.

Claims

1. An optical photogrammetric deformation measurement synchronization control device, characterized in that, The application relates to a measurement field construction device, a front-end device, a multi-camera synchronous triggering device and a measurement data preprocessing method. The measurement field construction device comprises a portal frame and a rotatable cross-suspension beam arranged on the top of the portal frame and arranged to be rotatable around an axis perpendicular to the ground, and a camera arranged at the end of the rotatable cross-suspension beam. The front-end device comprises the camera and a power system for rotating the rotatable cross-suspension beam. The multi-camera synchronous triggering device is used for controlling the front-end device to realize synchronous data acquisition. The rotatable cross-suspension beam is provided with a starting position limiter, the rotatable cross-suspension beam starts timing from the starting point, stops when moving to the ending point, and starts to rotate after the timer reaches the cycle time, so that the accumulated error of the suspension beam angle caused by the motor rotating speed error of long-time back-and-forth movement is eliminated, and the ending point of the rotatable cross-suspension beam is provided with a blank area, the blank area is set to reserve an angle space of 5-10 degrees at the movement ending point through programming, and the hardware movement error accumulation is eliminated by combining the timer control.

2. The control device of claim 1, wherein The measurement field construction device further comprises a rotation turntable, the camera is installed on the rotatable cross-suspension beam through the rotation turntable, and the rotation turntable can drive the camera to rotate around the camera shooting direction axis.

3. The control device of claim 2, wherein The rotatable cross-suspension beam is composed of two vertical beams, and one camera is arranged at each of the four top points of the two vertical beams.

4. The control device of claim 2, wherein The rotatable cross-suspension beam and the rotation turntable are automatically linked, the rotation speed ratio combination is realized, the full automation of the measurement field construction is realized, and the system reliability is improved.

5. The control device of claim 1, wherein The multi-camera synchronous triggering device comprises a remote master station and a slave station, the remote master station is in communication connection with the slave station, the remote master station is a centralized control device, under the default condition, the remote master station sends an instruction, the instruction is forwarded through the slave station, the front-end device is controlled to complete shooting, when the remote master station and the slave station are interrupted in communication, the slave station is automatically switched to directly control the front-end device to complete shooting, and the slave station can also be manually switched to control the front-end device according to needs, and the image acquisition of multiple cameras is synchronously controlled.

6. An optical photogrammetric deformation measurement synchronization control method, characterized by, The optical photographic deformation measurement synchronous control device comprises the following: The movement angle speed of the suspension beam is set to further adjust the construction cycle of the measurement field, meanwhile, the coverage coefficient of the measurement field of view is further improved, and the data effectiveness and data quality are improved. The measurement data preprocessing is based on the measurement field parameters to automatically segment data and establish data samples, and the establishment of the optimal measurement data unit is realized. The centralized control realizes the man-machine interaction of the photographic deformation measurement synchronous control, the design and control of the multi-camera synchronous triggering device and the measurement field construction device are realized, the optimal deformation measurement field construction of multiple cameras is realized, and the high-reliability and full-automation control of the measurement data parameters of the measurement field construction is realized.

7. The method of claim 6, wherein, The measurement data preprocessing is specifically that, according to the preset optimal measurement field measurement cycle, the system measurement data is preprocessed, that is, the measurement image data of multiple cameras in the same measurement cycle time period is grouped to form a data package of each measurement cycle, and the processing speed of the late-stage precision analysis of the measurement data is improved.

8. The method of claim 6, wherein, The centralized control is specifically that the one-key synchronous starting and stopping of the devices and data processing is realized by the centralized setting of the multi-camera synchronous triggering device, the measurement field construction device and the data preprocessing cycle, the operation convenience of the deformation measurement synchronous control device is maximally improved, and the measurement data error caused by the non-synchronous starting of different devices can be reduced.

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