Real time evaluation and correction of nonlinear errors in single frequency interferometers

Wang, C.H., Augousti, A.T. and Mason, J. (2000) Real time evaluation and correction of nonlinear errors in single frequency interferometers. Transactions of the Institute of Measurement and Control, 22(5), pp. 405-412. ISSN (print) 0142-3312

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Nonlinear errors in single frequency interferometers are mainly caused by inaccuracies in quadrature signals. A novel design for real time correction of these errors has been developed using a technique based on the use of a microcontroller and computational analogue circuits. The former is responsible for the detection of these nonlinear errors while the latter is responsible for their correction. As a result, errors arising from nonlinearity are reduced to about 0.3% of an interference fringe over a bandwidth for the quadrature signals ranging from d.c. to 100 kHz. Moreover, a simplified method for evaluating the degree of these nonlinear errors without resorting to a length standard is also presented. Finally, a demonstration application of this new correction technique to a laser interferometer was carried out and experimental results are given.

Item Type: Article
Uncontrolled Keywords: error correction, laser interferometer, nonlinear errors
Research Area: Physics
Faculty, School or Research Centre: Faculty of Science (until 2011)
Faculty of Science (until 2011) > School of Life Sciences
Depositing User: Katrina Clifford
Date Deposited: 09 Sep 2008
Last Modified: 14 Aug 2017 12:17

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