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Optical Engineering

Measurement of small angular displacement by a modified moiré technique
Author(s): Brahm Pal Singh; Kowsalya Varadan; Vijay Trimbak Chitnis
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Paper Abstract

Small angle measurement using a modified moiré interference technique is reported. The range of angle measurement for 25-μm pitch gratings is about ± 25 μrad and the accuracy of measurement is of the order of 0.2 μrad with a time constant of 0.1 s. A piezoelectric transducer (PZT) is used for angular displacement. The angular sensitivity under the present experimental conditions is found to be of the order of 21.8 mV/μrad.

Paper Details

Date Published: 1 December 1992
PDF: 3 pages
Opt. Eng. 31(12) doi: 10.1117/12.60025
Published in: Optical Engineering Volume 31, Issue 12
Show Author Affiliations
Brahm Pal Singh, Indian Institute of Technology (Japan)
Kowsalya Varadan, National Physical Lab. (India)
Vijay Trimbak Chitnis, National Physical Lab. (India)

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