Translator Disclaimer
3 October 2008 Random-phase-shift Fizeau interferometer
Author Affiliations +
Proceedings Volume 7155, Ninth International Symposium on Laser Metrology; 71550S (2008)
Event: Ninth International Symposium on Laser Metrology, 2008, Singapore, Singapore
In the context of this article we demonstrate a novel Fizeau interferometric system that copes with the presence of vibrations. Besides the conventional high spatial, but low temporal resolution detector system (the CCD camera) used in phase shifting interferometry, an additional high temporal, but low spatial resolution detector system was integrated, in order to measure the random phase shifts that are induced under the influence of the vibrations. The additional sensor consists of three photodiodes. The acquired analog signals enable the measurement of the occurring phase shifts at three non-collinear locations on the test surface. Under the assumption of the rigid body shifts and tilts of the test object, the resulting phase shifts at the three individual locations enable the determination of the random phase shifts over the entire image aperture. While the random oscillations of the test object are continuously measured, the CCD camera acquires several interferograms. In consequence, a phase shifting algorithm for random phase shifts was applied. In order to prove the validity of the new interferometer, a test surface of known topography was measured. The results of the measurements in presence of vibrations show very good concordance with the surface data given by the supplier. The analysis of the root mean square (RMS) over ten different measurements shows a measurement repeatability of about 0.004 waves (approximately 2.5 nm for 632.8 nm laser wavelength).
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Nicolae Radu Doloca and Rainer Tutsch "Random-phase-shift Fizeau interferometer", Proc. SPIE 7155, Ninth International Symposium on Laser Metrology, 71550S (3 October 2008);


Dynamic interferometry
Proceedings of SPIE (August 29 2005)
Digital Phase-Shifting Interferometry
Proceedings of SPIE (December 31 1986)
Beyond fringe analysis
Proceedings of SPIE (December 09 1993)
Phase-shift Fizeau interferometer in presence of vibration
Proceedings of SPIE (August 10 2008)

Back to Top