New PMP method with two-frequency grating projection

Jie-lin Li

doi:10.1117/12.2299115

1 September 1996 New PMP method with two-frequency grating projection

Jie-lin Li

Proceedings Volume 2778, 17th Congress of the International Commission for Optics: Optics for Science and New Technology; 27786G (1996) https://doi.org/10.1117/12.2299115
Event: 17th Congress of the International Commission for Optics: Optics for Science and New Technology, 1996, Taejon, Korea, Republic of

Abstract

In phase-shift phase-measuring profilometry [1,2], an equivalent wavelength of the system could be defined as = P where p0 is the mean fringe pattern period at the reference plane, and e is the angle between the P. 0 direction of projection and the direction of observation. Increasing of equivalent wavelength leads to slowing down of the fringe phase variation. It would be benefit to phase unwrapping , but in the same time it leads to lower measurement accuracy. Here we present a new method. Considering both the reliability of phase unwrapping and the measurement accuracy of the system, we make two sets of fringes with different frequencies on a single grating pattern. Instead of using N (N=3,4,5 ...) phase steps, 2N phase steps is used. The phases of the two frequencies are calculated separately. It's possible to unwrap the high frequency phase, with reference to the low frequency phase.

Citation Download Citation

Jie-lin Li "New PMP method with two-frequency grating projection", Proc. SPIE 2778, 17th Congress of the International Commission for Optics: Optics for Science and New Technology, 27786G (1 September 1996); https://doi.org/10.1117/12.2299115

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