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Proceedings Paper

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

Paper Details

Date Published: 2 August 2004
PDF: 8 pages
Proc. SPIE 5532, Interferometry XII: Applications, (2 August 2004); doi: 10.1117/12.560385
Show Author Affiliations
Saba Mirza, Indian Institute of Technology Delhi (India)
Chandra Shakher, Indian Institute of Technology (India)
National Institute of Technology, Hamirpur (India)

Published in SPIE Proceedings Vol. 5532:
Interferometry XII: Applications
Wolfgang Osten; Erik Novak, Editor(s)

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