The real-time measurement by two-frequency grating

WANG Xiang-hua; HE Xing-dao; FU Yan-jun

In order to measure an object with some breaks precisely and in real-time,the two-frequency grating was created with VC++ first,and then the grating was projected on the surface of the object by LCD projector,so that the phase difference could be calculated by means of Fourier transform profilometry(FTP) from only one image,and the shape of the object could recur.Experiments indicate that this method is simple,exact and in real-time,it greatly promotes the development of FTP by two-frequency grating.

Corresponding author: FU Yan-jun, fyjpkh@sina.com

1. Key Laboratory of Nondestructive Test(Ministry of Education), Nanchang Institute of Aeronautical Technology, Nanchang 330063, China

Received Date: 2006-06-03

Accepted Date: 2006-09-12

Available Online: 2007-08-25

Abstract: In order to measure an object with some breaks precisely and in real-time,the two-frequency grating was created with VC++ first,and then the grating was projected on the surface of the object by LCD projector,so that the phase difference could be calculated by means of Fourier transform profilometry(FTP) from only one image,and the shape of the object could recur.Experiments indicate that this method is simple,exact and in real-time,it greatly promotes the development of FTP by two-frequency grating.

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Reference (10)

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The real-time measurement by two-frequency grating

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