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• Rerucha, S
• Buchta, Z
• Sarbort, M
• Lazar, J
• Cip, O
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• Rerucha, S
• Buchta, Z
• Sarbort, M
• Lazar, J
• Cip, O
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• Rerucha, S
• Buchta, Z
• Sarbort, M
• Lazar, J
• Cip, O

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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

Simon Rerucha* , Zdenek Buchta, Martin Sarbort, Josef Lazar and Ondrej Cip

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)

Download PDF Full-Text [480 KB, uploaded 19 October 2012 14:12 CEST]

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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