Absolute angle measurement using dual-wavelength laser speckle: theory and method

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dc.contributor.authorGibson, Sam J.
dc.contributor.authorCharrett, Thomas O. H.
dc.contributor.authorTatam, Ralph P.
dc.date.accessioned2024-01-04T15:50:22Z
dc.date.available2024-01-04T15:50:22Z
dc.date.issued2023-11-30
dc.description.abstractThis paper presents a method utilising the speckle pattern formed by dual-wavelength illumination for the measurement of the two out-of-plane surface angles with respect to the sensor frame. Theoretical expressions are derived relating the observed speckle shift between patterns formed by two wavelengths for tilted surfaces with both on-axis and off-axis detector positions. These expressions are verified experimentally, showing RMS errors of between 0.5–1.0 . Finally, an on-axis implementation of the concept is presented using dual-wavelength illumination generated from two modes of a standard FP diode laser. Simplified expressions for the calculation of surface angles from measured speckle shift using this arrangement are presented, given in terms of three sensor constants; the responsivity or sensitivity of the sensor, C, and the zero surface tilt speckle shifts, Ax0 and Ay0. Experimental results using this sensor for a range of surface tilts between 0.0° and 7.5° showed an RMS error of 0.10° in θx and 0.19° in θy.en_UK
dc.identifier.citationGibson SJ, Charrett TO, Tatam RP. (2024) Absolute angle measurement using dual-wavelength laser speckle: theory and method. Optics and Lasers in Engineering, Volume 174, March 2024, Article number 107956en_UK
dc.identifier.issn0143-8166
dc.identifier.urihttps://doi.org/10.1016/j.optlaseng.2023.107956
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/20608
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectLaser speckle theoryen_UK
dc.subjectAbsolute angle measurementen_UK
dc.subjectDual-wavelength speckleen_UK
dc.titleAbsolute angle measurement using dual-wavelength laser speckle: theory and methoden_UK
dc.typeArticleen_UK
dcterms.dateAccepted2023-11-19

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