A mechanically stable laser diode speckle interferometer for surface contouring and displacement measurement

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dc.contributor.authorFrancis, Daniel
dc.contributor.authorMasiyano, Dackson
dc.contributor.authorHodgkinson, Jane
dc.contributor.authorTatam, Ralph P.
dc.date.accessioned2016-02-22T14:39:54Z
dc.date.available2016-02-22T14:39:54Z
dc.date.issued2015-04-09
dc.description.abstractElectronic speckle pattern interferometry (ESPI) is demonstrated using a simple configuration consisting of a wedged window and a beamsplitter. The window serves to produce a reference beam which is in-line with the scattered object beam. The system is almost common-path and therefore provides much better mechanical stability than conventional ESPI configurations, which have widely separated beam paths. The configuration has collinear observation and illumination directions and therefore has maximum sensitivity to out-of-plane displacement. Wavelength modulation through adjustment of the laser diode control current provides a convenient method of phase shifting without the need for external moving parts. Further, variation of the laser diode control temperature allows extended wavelength tuning to adjacent longitudinal modes, facilitating surface contouring measurements via the two-wavelength technique. The interferometer is demonstrated for surface displacement measurement with a 3.3 μm centre displacement measured over a 15 mm × 15 mm region of a flat plate. Contour measurements of a shaped object are made using an equivalent wavelength of 1.38 mm.en_UK
dc.identifier.citationDaniel Francis, Dackson Masiyano, Jane Hodgkinson and Ralph P Tatam. A mechanically stable laser diode speckle interferometer for surface contouring and displacement measurement. Measurement Science and Technology, Volume 26, Number 5, 055402.en_UK
dc.identifier.issn0957-0233
dc.identifier.urihttp://dx.doi.org/10.1088/0957-0233/26/5/055402
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/9721
dc.language.isoenen_UK
dc.publisherInstitute of Physicsen_UK
dc.rightsContent from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Attribution 3.0 Unported (CC BY 3.0). You are free to: Share — copy and redistribute the material in any medium or format Adapt — remix, transform, and build upon the material for any purpose, even commercially. The licensor cannot revoke these freedoms as long as you follow the license terms. Under the following terms: Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. Information: No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.
dc.subjectESPIen_UK
dc.subjectspeckleen_UK
dc.subjectinterferometryen_UK
dc.subjectcontouringen_UK
dc.subjectlaser diodeen_UK
dc.titleA mechanically stable laser diode speckle interferometer for surface contouring and displacement measurementen_UK
dc.typeArticleen_UK

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