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) 0142-3312Full text not available from this archive.
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.
|Uncontrolled Keywords:||error correction, laser interferometer, nonlinear errors|
|Faculty, School or Research Centre:||Faculty of Science (until 2011) > School of Life Sciences
Faculty of Science (until 2011)
|Depositing User:||Katrina Clifford|
|Date Deposited:||09 Sep 2008|
|Last Modified:||01 Oct 2010 14:10|
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