High-temperature air disturbance filtering method based on structural light projection and digital image correlation

A technology of structured light projection and digital image, applied in the direction of using optical devices, measuring devices, instruments, etc., can solve the problems of no hot air flow analysis, complex optical system, unpredictable real-time state of air flow during separation process, etc., to reduce the measurement Steps and time, the effect of simplifying the system structure and reducing the design cost

Active Publication Date: 2018-05-18
HEFEI UNIV OF TECH
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Problems solved by technology

However, the method of high-frequency separation cannot be used for long-term measurement, and the separation process cannot predict the real-time state of the existing air flow. This denoising is actually a cumulative result, and the hot air flow is not analyzed, and The optical system is more complicated

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  • High-temperature air disturbance filtering method based on structural light projection and digital image correlation

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Embodiment Construction

[0028] In this embodiment, the high-temperature air disturbance filtering method based on structured light projection and digital image correlation is:

[0029] set as figure 1 The shown high-temperature air disturbance detection system based on structured light projection and digital image correlation, the detection system uses a structured light projector 1, and the projected light of the structured light projector 1 is reflected by the measured object 3 and passes through a band-pass optical filter It is irradiated on the CCD target array of camera 2; according to the law of black body radiation, when the temperature of the measured object 3 reaches 400°C, the visible light band in its thermal radiation will be significantly enhanced, which will affect the imaging of camera 2, so it is necessary to A band-pass optical filter is added in front of the lens; randomly distributed speckle is coated on the surface of the measured object 3, and the grayscale information of the spe...

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Abstract

The invention discloses a high-temperature air disturbance filtering method based on structural light projection and digital image correlation. A high-temperature air disturbance detection system based on structured light projection and digital image correlation, in each stage of measurement, performs structured light projection and monochromatic light projection on an object to be measured by using a structured light projector, acquires grayscale images, performs Fourier analysis on two grayscale image sequences, determines whether the low-frequency term in the Fourier spectrum of the planarstructure light grayscale image is a heat flow disturbance confidence probability and filters out the same, obtains morphologic information and out-of-plane deformation information by Fourier profile profilometry; filters out the heat flow disturbance of the spectrum of the monochromatic light illumination image by using the confidence probability, and then performs inverse Fourier transform anddigital image correlation operation to obtain in-plane deformation information with the heat flow disturbance filtered out. The method can meet the requirements of modern metering for high temperature, high speed and high precision, and reduce the influence of air disturbance under high-temperature measurement environment.

Description

technical field [0001] The invention relates to an air disturbance filtering method, in particular to a rapid denoising technology for non-contact measurement in a high-temperature environment, improving the accuracy and timeliness of high-temperature measurement, and broadening the application of digital image correlation technology in high-temperature online detection. It can be widely used in high-temperature strain and deformation measurement in machinery manufacturing, aerospace, materials and biology. Background technique [0002] Digital Image Correlation (DIC) is an optical measurement method that integrates machine vision, electronics, image processing and calibration technologies, and has the advantages of high precision, non-contact and full-field measurement. It is widely used in the measurement of machinery manufacturing, aerospace, materials and biology. [0003] In digital image correlation, using the principle of binocular vision imaging to measure the three...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/24G01B11/25
Inventor 王永红但西佐孙建飞高新亚鲍思源杨连祥
Owner HEFEI UNIV OF TECH
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