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High-temperature three-dimensional digital image related measurement system and method based on single camera

A three-dimensional digital, image-related technology, applied in measuring devices, instruments, and optical devices, etc., can solve the problems of increasing the complexity of hardware and software, increasing the synchronization transmission time error, and high cost, so as to widen the measurement range, eliminate the Error, effect of simple composition structure

Active Publication Date: 2020-07-14
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Traditional 3D digital image processing is based on multiple industrial cameras, which is expensive and increases the complexity of hardware and software; when using two cameras, it will increase the time error in synchronous transmission, especially in high-speed In cameras, this error will be further magnified; therefore, it is imminent to choose a measurement system that is more economical and has simpler algorithms

Method used

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  • High-temperature three-dimensional digital image related measurement system and method based on single camera
  • High-temperature three-dimensional digital image related measurement system and method based on single camera
  • High-temperature three-dimensional digital image related measurement system and method based on single camera

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Embodiment 1

[0027] A high-temperature three-dimensional digital image correlation measurement system based on a single camera, the high-temperature three-dimensional digital image correlation measurement system includes an industrial camera 1, a shutter 2, a He-Ne laser 3, a beam expander 4, a collimating mirror 5, and a plane mirror Ⅰ6, plane mirror Ⅱ7, frosted glass 8, high-temperature test piece 9, plane mirror Ⅲ10, He-Ne laser 3 emits laser light, and the emitted laser light passes through beam expander 4, collimating mirror 5, and ground glass 8 in order to make its speckle spots randomly distributed On the surface of the high-temperature test piece 9 to be tested, as the marking point II, the surface of the high-temperature test piece 9 to be tested is coated with random green speckles with green paint; the calibration plate is located at the high-temperature object to be tested, and is used to detect various parameters of the system;

[0028] Plane mirror Ⅰ6 and plane mirror Ⅱ7 are ...

Embodiment 2

[0030] A high-temperature three-dimensional digital image correlation measurement method based on a single camera, specifically comprising the following steps:

[0031] (1) First, place all the components of the system, place the calibration plate in the center of the system, and obtain various parameters of the system and the camera, including the distance between the plane mirror I6 and the plane mirror II7, the distance between the camera and the plane mirror III, and the parameters of the industrial camera. item parameter.

[0032] (2) According to the measurement requirements of the high-temperature test piece 9 to be tested, the high-temperature test piece 9 to be tested is placed in the center of the system, and the surface is randomly sprayed with green paint as the marking point I.

[0033] (3) Turn on the He-Ne laser 3, and the emitted laser beam is expanded and collimated, and then passes through the thin ground glass 8, so that its speckle spots are randomly distri...

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Abstract

The invention discloses a high-temperature three-dimensional digital image related measurement system and method based on a single camera, and belongs to the field of digital image application. The system comprises a He-Ne laser, an industrial camera, a plane mirror II, a plane mirror I, a plane mirror III, a beam expander, a collimating mirror, frosted glass and the like. Green random speckles are sprayed on a measured object to serve as identification points I, random red speckles are generated by a He-Ne laser through frosted glass to serve as identification points II, the identification points I move along with movement of the measured object, and the identification points II do not move. Displacement fields are respectively calculated for speckle images of the identification points Iand II, and the difference value of the two displacement fields is used as an actual deformation field of the measured object, so the influence caused by thermal disturbance is greatly eliminated. Thesystem is used for measuring the three-dimensional morphology and the deformation field of an object in a high-temperature environment, eliminates the measurement error caused by thermal disturbance,and enables the result to be more accurate.

Description

technical field [0001] The invention relates to a high-temperature three-dimensional digital image correlation measurement system and method based on a single camera, belonging to the field of digital image applications. Background technique [0002] As a non-contact measurement method, digital image correlation has shown great advantages in aerospace, machinery, civil engineering and other fields. With the rapid development of science and technology, the requirements for materials are gradually increasing. Many new materials need to work in harsh environments with high temperature, high pressure and corrosiveness. For example, the maximum temperature of aviation jet engines can reach 1000°C. Therefore, it is very important to study the mechanical properties of materials under high temperature environment. At present, most of the means of measuring the mechanical properties of materials are some contact measurement methods. For example: strain gauge measurement, sensor mea...

Claims

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Application Information

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IPC IPC(8): G01B11/16
CPCG01B11/16G01B21/045
Inventor 王昊马琨杨宇桥龚艳琼
Owner KUNMING UNIV OF SCI & TECH
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