Detection of interference phase by digital computation of quadrature signals in homodyne laser interferometry

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 photodet...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2012-10, Vol.12 (10), p.14095-14112
Main Authors: Rerucha, Simon, Buchta, Zdenek, Sarbort, Martin, Lazar, Josef, Cip, Ondrej
Format: Article
Language:English
Subjects:
Accuracy
Complexity
Computation
digital signal processing
homodyne detection
Interference
Interferometry
Laser beams
Laser interferometry
Lasers
Methods
Modulation
optical metrology
Quadratures
Sensors
Signal processing
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Summary: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).
ISSN:1424-8220
1424-8220
DOI:10.3390/s121014095