Color ccd micro moiré method for surface deformation measurement
A curved surface and color technology, applied in the field of color CCD micromoiré method, achieves the effects of high precision, low implementation cost and improved measurement accuracy
Inactive Publication Date: 2015-11-18
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology
[0005] The technical problem to be solved in this application is to provide a color CCD micromoiré method for measuring curved surface deformation, to solve how to measure the deformation of curved surface components while improving the accuracy
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Embodiment 1
[0032] Such as figure 1 As shown, it is a color CCD micro-moiré method for measuring surface deformation described in Embodiment 1 of the present application. The method includes:
[0033] Step 101, making a highly elastic film with a certain strength and hardness, using a standard holographic grating to transfer on the high elastic film to produce a highly elastic film grid, and pasting the film grid on the surface of the curved test piece to form a curved test piece grid ;
[0034] Step 102, a monochromatic light source illuminates the surface of the curved test piece grid, and a color CCD camera equipped with a microscope lens is used to collect surface images of the curved test piece grid before and after deformation;
[0035] Step 103, using the Bayer filter in front of the target surface in the color CCD camera as a reference grid, and the plane image formed on the image plane after the partial area of the curved test specimen grid is microscopically enlarged as the t...
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The invention discloses a color CCD micro moire method for surface deformation measurement, and belongs to the technical field of experimental mechanics. The color CCD micro moire method for surface deformation measurement is technically characterized in that a standard holographic grating is used for being manufactured into a high-elastic thin film grating, a surface test piece grating is formed after the thin film grating is adhered to the surface of a surface test piece to be measured, a Bayer optical filter in front of a target surface of a color CCD camera is treated as a reference grating, color moire fringes can be formed when the pitch of the image of the surface test piece grating is matched with six lines of units of the Bayer optical filter in the color CCD camera, and a deformation field of the surface test piece is obtained after calculation. The color CCD micro moire method is applied to surface deformation measurement for the first time, therefore, the quality of the CCD moire fringes is improved, and the application range of the moire method is widened. Compared with a strain gage method, the color CCD micro moire method has the advantages that non-contact continuous measurement can be achieved, the measurement area can be smaller, and the efficiency is higher.
Description
technical field [0001] The application relates to the fields of experimental mechanics, component deformation and displacement testing, and in particular relates to a color CCD micro-moiré method for measuring curved surface deformation. Background technique [0002] The moiré method is a measurement technique for the full-field deformation of objects that emerged in the 1960s. It is an important measurement method in experimental mechanics. It can be divided into geometric moiré methods and moiré interferometry. The moiré method is a method of forming moiré by overlapping two sets of grating lines, which has low requirements on experimental conditions and has been widely used. The moiré method is widely used in the measurement of plane deformation, but rarely used in the measurement of curved surface deformation. Some researchers have also done some work on measuring the deformation of the surface, especially the deformation of the surface by moiré method. Liu Zhanwei et ...
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IPC IPC(8): G01B11/16
Inventor 刘战伟吴辰龙张宏业谢惠民
Owner BEIJING INSTITUTE OF TECHNOLOGYGY