Surface profiling of turbine blade using phase-shifting Talbot interferometric technique

Saba Mirza; Chandra Shakher

doi:10.1117/12.560385

2 August 2004 Surface profiling of turbine blade using phase-shifting Talbot interferometric technique

Saba Mirza, Chandra Shakher

Proceedings Volume 5532, Interferometry XII: Applications; (2004) https://doi.org/10.1117/12.560385
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

Abstract

In this paper we present phase shifting Talbot interferometric technique to draw the profile of the gas turbine blade. In Talbot interferometry phase shifting is implemented by giving in-plane translation to first grating by using precision translation stage. To obtain the phase connected with the object, the additional phase change stepwise, with a step of π/2 at least three times is introduced and the intensity patterns corresponding to these steps are recorded as Talbot interferometric fringes pattern. Experimentally recorded interferograms have noise due to grating lines and speckles. These noises are filtered by using Fourier filtering technique. The phase map made by using Fourier filtered data. Height variations/profile of the gas turbine blades made by using phase shifting Talbot Interferometry are compared with the results obtained from Co-ordinate Measuring Machine (CMM) having coordinate measurement facility with the resolution of 1μm. The results are in good agreement.

Citation Download Citation

Saba Mirza and Chandra Shakher "Surface profiling of turbine blade using phase-shifting Talbot interferometric technique", Proc. SPIE 5532, Interferometry XII: Applications, (2 August 2004); https://doi.org/10.1117/12.560385

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