Novel composite coded pattern for small angle measurement using imaging method -art.no.62891D

Nukala, Suguna Sree and Gorthi, Sai Siva and Lolla, Kameswara Rao (2006) Novel composite coded pattern for small angle measurement using imaging method -art.no.62891D. In: Conference on Novel Optical Systems Design and Optimization IX,, Aug 15-16, 2006, San Diego, CA, D2891.

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Abstract

A novel approach for measurement of small rotation angles using imaging method is proposed and demonstrated. A plane mirror placed on a precision rotating table is used for imaging the newly designed composite coded pattern. The imaged patterns are captured with the help of a CCD camera. The angular rotation of the plane mirror is determined from a pair of the images of the pattern, captured once before and once after affecting the tilt of the mirror. Both simulation and experimental results suggest that the proposed approach not only retains the advantages of the original imaging method but also contributes significantly to the enhancement of its measuring range (+/- 4.13 degrees with accuracy of the order of 1 arcsec).

Item Type:	Conference Paper
Series.:	PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE)
Publisher:	SPIE-International Society for Optical Engineering
Additional Information:	Copyright of this article belongs to SPIE-International Society for Optical Engineering.
Keywords:	Small-rotation–angle measurement;imaging method; composite coded pattern; FFT analysis; phase unwrapping, measurement range.
Department/Centre:	Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited:	26 Aug 2010 05:13
Last Modified:	19 Sep 2010 06:12
URI:	http://eprints.iisc.ac.in/id/eprint/30701

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