Camera automatic regulating image acquisition device and method for fatigue crack propagation test

A technology of fatigue crack propagation and automatic adjustment, which can be used in measurement devices, image communication, television, etc., and can solve problems such as poor real-time performance, low work efficiency, and high labor intensity.

Inactive Publication Date: 2012-09-26
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the shortcomings of manual operation, low control precision, poor real-time performance, high labor intensity and low work efficiency of the existing fatigue crack growth test camera adjustment technology, the

Method used

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  • Camera automatic regulating image acquisition device and method for fatigue crack propagation test
  • Camera automatic regulating image acquisition device and method for fatigue crack propagation test
  • Camera automatic regulating image acquisition device and method for fatigue crack propagation test

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Embodiment 1

[0049] refer to Figure 1 to Figure 10 , a fatigue crack growth test camera automatically adjusts the image acquisition system, including the test piece, image imaging and acquisition system, camera position adjustment system and computer processing analysis control system. The necessary fatigue testing machine and fatigue testing machine load control system. The CCD camera, lens, and light source device are installed on the camera mounting bracket to form an image imaging unit. The CT compact specimen with prefabricated cracks is installed on a fatigue testing machine that generates a set alternating load. The specimen is under the action of the alternating load. The cracks continue to expand, and the light provided by the light source device shines on the surface of the test piece. The surface of the test piece is treated as slow reflection, and the uniformly reflected light is projected onto the CCD target surface through the lens. The CCD and the data acquisition card are ...

Embodiment 2

[0064] refer to Figure 1 to Figure 10 , a fatigue crack growth test camera automatically adjusts the image acquisition method: the system sends the camera movement mode and distance control signal to the camera motion controller by the computer, and the camera motion controller selects the stepping motor control mode according to the received command, and sends the control instruction to control Camera movement positioning PTZ movement, such as for crack expansion camera tracking and positioning image acquisition, the camera position adjustment is carried out through the ARM motion controller for movement displacement closed-loop control, after the position adjustment is completed, the system continues to image acquisition, processing, and crack length calculation and other tasks, the specific implementation methods are as follows Image 6 , Figure 7 As shown; if the image is collected during the automatic focusing process of the camera, the computer image processing softwa...

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Abstract

The invention relates to a camera automatic regulating crack image acquisition system for a fatigue crack propagation test, which comprises a crack image imaging and acquiring system, a camera position regulating system and a computer processing and analysis control system, wherein the crack image imaging and acquiring system comprises a CCD (Charge Coupled Device) camera, a lens, a light source illuminating device, a camera mounting bracket and an image acquiring card; the CCD camera, the lens and the light source illuminating device are arranged on the camera mounting bracket to form a crack image imaging unit; the image acquiring card is connected with a computer; a camera position regulating device comprises a stepping motor, a camera motion positioning cloud deck, a motion controller and a stepping motor driver; and the computer processing and analysis control system comprise the computer and a camera automatic regulating image acquisition module in an ARM motion controller. The invention also provides a camera automatic regulating crack image acquisition method for the fatigue crack propagation test. According to the camera automatic regulating image acquisition device and method for fatigue crack propagation test provided by the invention, the full-automatic operation is adopted; the control accuracy is high; and the real-time performance is excellent; and the labor intensity is reduced.

Description

technical field [0001] The invention relates to a camera adjustment image acquisition device and method for a fatigue crack growth test. Background technique [0002] The metal fatigue crack growth test is a test method to study the fatigue fracture characteristics of metal materials by measuring the length of fatigue cracks generated by the specimen under the action of a set alternating load in real time. At present, the main form of fatigue crack growth test is the international The C(T) compact tensile test and the three-point bending crack growth test with pre-cracks specified in the standard, in this case, the fatigue cracks basically extend linearly along the direction of the pre-cracks under the action of the set alternating load, Other non-standard fatigue crack growth tests are basically in this form, but the shape and size of the test piece are changed. [0003] The initiation and propagation of fatigue cracks is a complex and slow nonlinear evolution process. The...

Claims

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Application Information

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IPC IPC(8): G01N3/06H04N5/225H04N5/232F16M11/42F16M11/04F16M11/18G05D3/12
Inventor 高红俐裘信国钱华荣周寅钟建飞陈蓓
Owner ZHEJIANG UNIV OF TECH
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