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Proceedings Paper

Holographic common-path interferometer for measuring tilt or vibrations utilizing a spatial heterodyne principle
Author(s): Steven Richard Kitchen; Carsten Dam-Hansen
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Paper Abstract

A novel technique for extending the unambiguous range for differential measurements of linear surface deflections is presented. The principle utilises a new type of spatial heterodyne system, where a common-path interferometer probes the axial displacement of three points on the object surface simultaneously. The system is based on a single laser diode with all the optical functions of the system implemented in a single holographic optical element (HOE). The common-path scheme combined with the HOE provides a system that is inherently stable, since the HOE operates both as transmitter and receiver in the system. The HOE at the same time provides a simple and all passive quadrature phase measurement without the need for any active elements or polarising optics. The system is compact, robust, and has the potential for being mass-produced at a low cost and is thus well suited for industrial use. The demonstrated system can measure vibrations or tilt with an unambiguous dynamic range of approximately 1:14,000. Furthermore, the system can easily be reconfigured for a desired sensitivity and dynamic range.

Paper Details

Date Published: 22 May 2002
PDF: 11 pages
Proc. SPIE 4827, Fifth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (22 May 2002); doi: 10.1117/12.468144
Show Author Affiliations
Steven Richard Kitchen, Risoe National Lab. and Kamstrup A/S (Denmark)
Carsten Dam-Hansen, Kamstrup A/S (Denmark)

Published in SPIE Proceedings Vol. 4827:
Fifth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications
Enrico Primo Tomasini, Editor(s)

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