Interferometric testing of large optics in the presence of vibration

Details Interferometric testing of large optics in the presence of vibration Interferometric testing of large optics in the presence of vibration

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1236..641w&link_type=abstract

IN: Advanced technology optical telescopes IV; Proceedings of the Meeting, Tucson, AZ, Feb. 12-16, 1990. Part 2 (A91-23201 08-89

Physics

Optics

Frequency Shift, Interferometers, Optical Measuring Instruments, Phase Shift, Vibration Effects, Acousto-Optics, Charge Coupled Devices, Phase Error, Polishing, Television Cameras

Scientific paper

A modification to the usual phase-shifting interferometry algorithm permits measurements to be taken fast enough to essentially freeze out vibrations. Only two interferograms are time critical in this 2 + 1 algorithm; the third is a null. An error analysis has been performed for this new algorithm. The implemented system acquires the two time-critical interferograms with a 1-msec separation, on either side of the interline transfer of a standard CCD video camera, resulting in a reduction in sensitivity to vibration of one to two orders of magnitude. The required phase shift is achieved via frequency shifting.

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