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Optical Engineering

Full-field heterodyne interferometry using a complementary metal-oxide semiconductor digital signal processor camera for high-resolution profilometry
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Paper Abstract

We describe a heterodyne interferometry system based on a complementary metal-oxide semiconductor digital signal processor (CMOS-DSP) camera that is utilized for full-field optical phase measurement using a carrier-based phase retrieval algorithm, with no need for electro-mechanical scanning. Camera characterization test results support the adoption of a single-pixel approach to perform quasi-instantaneous differential phase measurements, which are immune to mechanical vibrations and thermal drifts. We developed an optical configuration based on a Mach-Zehnder heterodyne interferometer to perform a static test on a mirror surface. The profiles of the mirror surface set at two angular positions, the relative displacements in the range of nanometers, and the corresponding tilt angle were determined.

Paper Details

Date Published: 1 September 2007
PDF: 5 pages
Opt. Eng. 46(9) 095601 doi: 10.1117/1.2779346
Published in: Optical Engineering Volume 46, Issue 9
Show Author Affiliations
Mauro V. Aguanno, Joint Research Ctr. (Italy)
Fereyduon Lakestani, Joint Research Ctr. (Italy)
Maurice Patrick Whelan, Joint Research Ctr. (Italy)
Michael J. Connelly, Univ. of Limerick (Ireland)

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