Computational approach to interference phase detection and linearity error correction in laser interferometry

0426201 - ÚPT 2015 ME eng A - Abstrakt
Řeřucha, Šimon - Šarbort, Martin - Buchta, Zdeněk - Číp, Ondřej - Lazar, Josef
Computational approach to interference phase detection and linearity error correction in laser interferometry.
21th annual International Conference on Advanced Laser Technologies ALT´13. Book of Abstracts. Budva: University of Montenegro, 2013. s. 54.
[ALT´13. Annual International Conference on Advanced Laser Technologies /21./. 16.09.2013-20.09.2013, Budva]
Grant CEP: GA ČR GAP102/10/1813; GA MŠMT ED0017/01/01; GA MŠMT EE2.3.30.0054; GA MPO FR-TI2/705; GA MPO FR-TI1/241
Institucionální podpora: RVO:68081731
Klíčová slova: laser interferometry * computational approach
Kód oboru RIV: BH - Optika, masery a lasery

Although the laser interferometry represents the most precise class of techniques in the field of precise measurement of geometrical quantities, its wide use in measurement systems is still accompanied by many unresolved challenges. One of these challenges it the complexity of underlying optical systems that makes the interferometry systems very sensitive and expensive devices. We present a novel approach to the interference phase detection in homodyne laser interferometry that aims at reduction of the optical complexity while the resolution is preserved. Our method employs a series of computational steps to infer a pair of signals in quadrature that allows to determine the interference phase with a sub-nanometre resolution from an interference signal from a non-polarising interferometer sampled by a single photodetector. The data processing covers a the phase detection as well as several errorcorrection and scale linearization techniques. The complexity trade-off is the use of laser beam with frequency modulation capability. The method was experimentally evaluated on a Michelson interferometer-based free-space setup and its performance has been compared to a traditional homodyne detection method.The results indicate the method is a feasible alternative for the traditional homodyne detection since it performs with comparable accuracy (< 0.5nm standard deviation), especially where the optical setup complexity is principal issue and the modulation of laser beam is not a heavy burden, for instance in multi-axis measurement systems or laser diode based systems.
Trvalý link: http://hdl.handle.net/11104/0235658