Next Article in Journal
6G Enabled Smart Infrastructure for Sustainable Society: Opportunities, Challenges, and Research Roadmap
Next Article in Special Issue
Development of a Compound Speckle Interferometer for Precision Three-Degree-of-Freedom Displacement Measurement
Previous Article in Journal
ZARATAMAP: Noise Characterization in the Scope of a Smart City through a Low Cost and Mobile Electronic Embedded System
Previous Article in Special Issue
High-Performance Ultra-Thin Spectrometer Optical Design Based on Coddington’s Equations
Article

Ghost Beam Suppression in Deep Frequency Modulation Interferometry for Compact On-Axis Optical Heads

1
Institute of Experimental Physics, University of Hamburg, Luruper Chaussee 149, D-22761 Hamburg, Germany
2
Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, D-22607 Hamburg, Germany
*
Authors to whom correspondence should be addressed.
Academic Editor: Ki-Nam Joo
Sensors 2021, 21(5), 1708; https://doi.org/10.3390/s21051708
Received: 10 February 2021 / Revised: 24 February 2021 / Accepted: 25 February 2021 / Published: 2 March 2021
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. View Full-Text
Keywords: laser interferometry; displacement sensing; ghost beams laser interferometry; displacement sensing; ghost beams
Show Figures

Figure 1

MDPI and ACS Style

Gerberding, O.; Isleif, K.-S. Ghost Beam Suppression in Deep Frequency Modulation Interferometry for Compact On-Axis Optical Heads. Sensors 2021, 21, 1708. https://doi.org/10.3390/s21051708

AMA Style

Gerberding O, Isleif K-S. Ghost Beam Suppression in Deep Frequency Modulation Interferometry for Compact On-Axis Optical Heads. Sensors. 2021; 21(5):1708. https://doi.org/10.3390/s21051708

Chicago/Turabian Style

Gerberding, Oliver; Isleif, Katharina-Sophie. 2021. "Ghost Beam Suppression in Deep Frequency Modulation Interferometry for Compact On-Axis Optical Heads" Sensors 21, no. 5: 1708. https://doi.org/10.3390/s21051708

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop