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

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

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Received: 31 August 2012; in revised form: 10 October 2012 / Accepted: 12 October 2012 / Published: 19 October 2012
(This article belongs to the Special Issue Laser Sensing and Imaging)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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).
Keywords: laser interferometry; optical metrology; homodyne detection; digital signal processing
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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.

AMA 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(10):14095-14112.

Chicago/Turabian Style

Rerucha, Simon; Buchta, Zdenek; Sarbort, Martin; Lazar, Josef; Cip, Ondrej. 2012. "Detection of Interference Phase by Digital Computation of Quadrature Signals in Homodyne Laser Interferometry." Sensors 12, no. 10: 14095-14112.

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