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Optical Engineering

Increasing the sensitivity for tilt measurement using a cyclic interferometer with multiple reflections
Author(s): Valiyaparambil Chacko Pretheesh Kumar; Charles Joenathan; Angarai Ganesan; Umapathy Somasundram
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Paper Abstract

Measurement of tilt plays an important role in metrological applications and consequently, several methods have been proposed in the recent past. Classical interferometric methods can measure angles with high accuracy but are easily susceptible to external turbulences. We propose to use a cyclic interferometer to measure tilt in which the sensitivity to tilt measurement is double when compared with that of the classical Michelson interferometer. Since the counter propagating beams travel identical paths, the interferometer is insensitive to external vibrations and turbulence and thus can be used under harsh environmental conditions. The novelty in the technique lies in creating multiple reflections in the tilt mirror to enhance the measurement accuracy by the way of increasing the sensitivity. This paper presents the basics of the interferometer and experimental results to quantify the increase in sensitivity. By increasing the number of reflections, it is shown that sensitivity can be further improved to measure tilt angles below 5  μ rad.

Paper Details

Date Published: 9 August 2016
PDF: 8 pages
Opt. Eng. 55(8) 084103 doi: 10.1117/1.OE.55.8.084103
Published in: Optical Engineering Volume 55, Issue 8
Show Author Affiliations
Valiyaparambil Chacko Pretheesh Kumar, Indian Institute of Technology Madras (India)
Charles Joenathan, Indian Institute of Technology Madras (India)
Angarai Ganesan, Indian Institute of Technology Madras (India)
Umapathy Somasundram, Indian Institute of Technology Madras (India)

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