Ghost Beam Suppression in Deep Frequency Modulation Interferometry for Compact On-Axis Optical Heads
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 surface...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-03-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/21/5/1708 |
| _version_ | 1797416216974852096 |
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| author | Oliver Gerberding Katharina-Sophie Isleif |
| author_facet | Oliver Gerberding Katharina-Sophie Isleif |
| author_sort | Oliver Gerberding |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-09T06:00:16Z |
| format | Article |
| id | doaj.art-8b6357c27b8342858896b609d1f5b518 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-09T06:00:16Z |
| publishDate | 2021-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-8b6357c27b8342858896b609d1f5b5182023-12-03T12:09:46ZengMDPI AGSensors1424-82202021-03-01215170810.3390/s21051708Ghost Beam Suppression in Deep Frequency Modulation Interferometry for Compact On-Axis Optical HeadsOliver Gerberding0Katharina-Sophie Isleif1Institute of Experimental Physics, University of Hamburg, Luruper Chaussee 149, D-22761 Hamburg, GermanyDeutsches Elektronen-Synchrotron DESY, Notkestraße 85, D-22607 Hamburg, GermanyWe 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.https://www.mdpi.com/1424-8220/21/5/1708laser interferometrydisplacement sensingghost beams |
| spellingShingle | Oliver Gerberding Katharina-Sophie Isleif Ghost Beam Suppression in Deep Frequency Modulation Interferometry for Compact On-Axis Optical Heads Sensors laser interferometry displacement sensing ghost beams |
| title | Ghost Beam Suppression in Deep Frequency Modulation Interferometry for Compact On-Axis Optical Heads |
| title_full | Ghost Beam Suppression in Deep Frequency Modulation Interferometry for Compact On-Axis Optical Heads |
| title_fullStr | Ghost Beam Suppression in Deep Frequency Modulation Interferometry for Compact On-Axis Optical Heads |
| title_full_unstemmed | Ghost Beam Suppression in Deep Frequency Modulation Interferometry for Compact On-Axis Optical Heads |
| title_short | Ghost Beam Suppression in Deep Frequency Modulation Interferometry for Compact On-Axis Optical Heads |
| title_sort | ghost beam suppression in deep frequency modulation interferometry for compact on axis optical heads |
| topic | laser interferometry displacement sensing ghost beams |
| url | https://www.mdpi.com/1424-8220/21/5/1708 |
| work_keys_str_mv | AT olivergerberding ghostbeamsuppressionindeepfrequencymodulationinterferometryforcompactonaxisopticalheads AT katharinasophieisleif ghostbeamsuppressionindeepfrequencymodulationinterferometryforcompactonaxisopticalheads |