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Optical Engineering

Sensitivity Improvement by Step-Biasing in Holographic Interferometry
Author(s): Mauro H. Zambuto; Amin Hanafy
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Paper Abstract

A technique of holographic interferometry yielding a one-order-of-magnitude increase in sensitivity over conventional techniques is described. The method, based on the superposition of a calibrated quarter-wavestep motion on the motion to be detected, is designated as step-biasing. The sensitivity improvements are due to a reversal of the brightness distribu-tion, so that vibrating points appear lighter, nodal points darker. A theoretical discussion of the technique, as applied to the detection of vibration by time-average holographic inter-ferometry, is offered and experimental verification with a 30A peak amplitude of vibration is presented, together with comparison with conventional techniques. The method was originally devised for application to real-time holographic interferometry. This is done easily, yielding the same sensitivity improvement.

Paper Details

Date Published: 1 August 1975
PDF: 3 pages
Opt. Eng. 14(4) 144372 doi: 10.1117/12.7971847
Published in: Optical Engineering Volume 14, Issue 4
Show Author Affiliations
Mauro H. Zambuto, New Jersey Institute of Technology (United States)
Amin Hanafy, L&R Manufacturing Co. (United States)

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