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

Institute of Scientific Instruments of the ASCR, Kralovopolska 147, 612 64 Brno, Czech Republic
* Author to whom correspondence should be addressed.
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)
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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).
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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