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Sensors 2012, 12(10), 14095-14112; doi:10.3390/s121014095

Detection of Interference Phase by Digital Computation of Quadrature Signals in Homodyne Laser Interferometry

Institute of Scientific Instruments of the ASCR, Kralovopolska 147, 612 64 Brno, Czech Republic
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Author to whom correspondence should be addressed.
Received: 31 August 2012 / Revised: 10 October 2012 / Accepted: 12 October 2012 / Published: 19 October 2012
(This article belongs to the Special Issue Laser Sensing and Imaging)
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Abstract

We have proposed an approach to the interference phase extraction in the homodyne laser interferometry. The method employs a series of computational steps to reconstruct the signals for quadrature detection from an interference signal from a non-polarising interferometer sampled by a simple photodetector. The complexity trade-off is the use of laser beam with frequency modulation capability. It is analytically derived and its validity and performance is experimentally verified. The method has proven to be a feasible alternative for the traditional homodyne detection since it performs with comparable accuracy, especially where the optical setup complexity is principal issue and the modulation of laser beam is not a heavy burden (e.g., in multi-axis sensor or laser diode based systems). View Full-Text
Keywords: laser interferometry; optical metrology; homodyne detection; digital signal processing laser interferometry; optical metrology; homodyne detection; digital signal processing
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Rerucha, S.; Buchta, Z.; Sarbort, M.; Lazar, J.; Cip, O. Detection of Interference Phase by Digital Computation of Quadrature Signals in Homodyne Laser Interferometry. Sensors 2012, 12, 14095-14112.

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