Open AccessFeatures of an acousto-optical two-channel laser displacement interferometer with multi-frequency photodetectors with subpycometer resolution
Author(s) -
Е. V. Leun
Publication year - 2022
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2182/1/012008
Subject(s) - heterodyne (poetry) , photodetector , displacement (psychology) , interferometry , optics , channel (broadcasting) , astronomical interferometer , laser , physics , phase (matter) , resolution (logic) , heterodyne detection , acoustics , computer science , telecommunications , artificial intelligence , psychology , quantum mechanics , psychotherapist
The article discusses the issues of improving acousto-optical (AO) heterodyne laser displacement interferometers (LDI) by using two independent multi-frequency photodetectors: high- frequency (HF) and low-frequency (LF) low-noise, working with "fast inaccurate" and "slow accurate" measuring channels, respectively. The "fast inaccurate" channel allows you to measure displacements with high velocity peed movements. The scheme of the "slow accurate" channel is based on the joint operation of a phase-locked frequency system and a small-range phase meter, providing high resolution for low velocity. Such a scheme of AO LDI most fully implements its capabilities in the control of start-stop cyclic movements of objects, providing high resolution at the initial and final stages of movements with low velocity. A metrological analysis of the "slow accurate" channel is carried out, the possibilities and conditions for achieving AO LDI at low velocity of subpicometer resolution are shown.