Double microscopic digital speckle strain measurement method

A technology of strain measurement and digital speckle, applied in the direction of measuring devices, instruments, and optical devices, can solve the problems of inability to carry out safety inspections of bridges in service, waste of financial resources, manpower, material resources, and long inspection cycles, etc., and achieve economic benefits Substantial, low resource consumption, and short detection cycle

Inactive Publication Date: 2008-05-21
KUNMING UNIV OF SCI & TECH
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  • Summary
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  • Claims
  • Application Information

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Problems solved by technology

However, due to the large amount of testing and the high cost of testing, many technologies are difficult to implement on the engineering site, so that traditional electrical testing methods such as pasting strain gauges are still widely used to test the bearing capacity of bridges
Since this method needs to arrange hundreds of test points on large bridges for maintenance and debugging measurement, the detection cycle is long, the detection cost is high, and a lot of financial, manpower, and material resources are wasted. unable to expand

Method used

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  • Double microscopic digital speckle strain measurement method
  • Double microscopic digital speckle strain measurement method
  • Double microscopic digital speckle strain measurement method

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Implementation 1: Measurement of micro-strain of large bridge components. As shown in accompanying drawing 2, the CCD 2 that is a group of band microscope lens 6 is installed on the fixed platform 1, according to the needs of measurement, multiple groups of such double microscopic CCD digital detection devices are set, and then the CCD 2 The fixed platform 1 and the measuring bridge deck 8 are connected into a unified body with the bridge deck fixing bolts 7 . Spray paint on the measurement bridge deck 8 to form a speckle field with better correlation performance, adjust the focus handwheel 4 of the lens barrel 5 to achieve the best image effect, and use the dual CCD 2 to simultaneously collect the distance between two points of the measured object The speckle images within the gauge distance before and after loading are transmitted to the PC 10 through the multi-channel image acquisition card 9, and the mechanical parameters of the measured object can be obtained throu...

Embodiment 2

[0022] Implementation 2: Measurement of the micro-strain of the plexiglass specimen. As shown in Figure 3, the plexiglass is processed into a standard test piece, and the plexiglass test piece 14 is sprayed with paint to make spots to form a speckle field with better correlation performance; the other end of the test piece is pasted with a strain gauge. The test piece and the double-microscopic digital speckle strain device are placed on the loading frame 13 of the mechanical experiment for tensile experiments. A comparative measurement is carried out, and the measurement results are completely converging.

Embodiment 3

[0023] Implementation 3: Measurement of the micro-strain of the plexiglass specimen. As shown in accompanying drawing 4, same as the above-mentioned example method, the dual microscopic digital speckle strain measurement method and the optical lever measurement method of the present invention are used to simultaneously measure the elastic modulus of the metal wire under the load of each increased load of 0.5kg weight, so The relative error of measuring the elastic modulus of the metal wire is less than 3%. .

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Abstract

The invention provides a digital double-micro speckle measuring method for strain. The invention relates to the measuring method for the stress and the strain of a structure, in particular to the measuring method for the stain with application of the photoelectron technology. The CCD with a micro-lens is arranged on a fixed platform while two CCDs serve as a group in the invention; when in measuring, a speckle field is manufactured on the surface of the measured object and the speckle images of the measured object in the scale distance between two points before and after being loaded are collected by the double-CCD synchronously and then are operated by the related processing software after being transmitted into a PC machine, at last, the mechanics parameter of the measured object can be obtained. The invention has short detection period, low consumption of resources, low detection cost, good economic benefit, easy interpretation and convenient and wide application. Meanwhile, the method can be used for detecting and evaluating the safety performance of other large buildings, such as houses, large dams, etc.

Description

technical field [0001] The invention relates to a method for measuring stress and strain of a structural part, in particular to a method for measuring strain using optoelectronic technology. Background technique [0002] In many highway networks in our country, there are thousands of large and small in-service bridges that need to be inspected for safety. At the same time, a large number of new bridges need to pass the quality and safety inspection every year. At present, although there are detection methods such as X-ray, CT, ultrasonic detection and embedded optical fiber in the component to detect the stress and strain of the key parts of the building. However, due to the large amount of testing and the high cost of testing, many technologies are difficult to implement on the engineering site, so that traditional electrical testing methods such as pasting strain gauges are still widely used to test the bearing capacity of bridges. Since this method needs to arrange hund...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B9/04G01B11/16
Inventor 马琨吴加权
Owner KUNMING UNIV OF SCI & TECH
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