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Ghost Beam Suppression in Deep Frequency Modulation Interferometry for Compact On-Axis Optical Heads.
- Source :
-
Sensors (14248220) . Mar2021, Vol. 21 Issue 5, p1708-1708. 1p. - Publication Year :
- 2021
-
Abstract
- We present a compact optical head design for wide-range and low noise displacement sensing using deep frequency modulation interferometry (DFMI). The on-axis beam topology is realised in a quasi-monolithic component and relies on cube beamsplitters and beam transmission through perpendicular surfaces to keep angular alignment constant when operating in air or in a vacuum, which leads to the generation of ghost beams that can limit the phase readout linearity. We investigated the coupling of these beams into the non-linear phase readout scheme of DFMI and implemented adjustments of the phase estimation algorithm to reduce this effect. This was done through a combination of balanced detection and the inherent orthogonality of beat signals with different relative time-delays in deep frequency modulation interferometry, which is a unique feature not available for heterodyne, quadrature or homodyne interferometry. [ABSTRACT FROM AUTHOR]
- Subjects :
- *BESSEL beams
*LASER interferometry
*INTERFEROMETRY
*CUBES
Subjects
Details
- Language :
- English
- ISSN :
- 14248220
- Volume :
- 21
- Issue :
- 5
- Database :
- Academic Search Index
- Journal :
- Sensors (14248220)
- Publication Type :
- Academic Journal
- Accession number :
- 149295714
- Full Text :
- https://doi.org/10.3390/s21051708