Compact optical system for measuring linear and angular displacement of solid structures

M.L. Jakobsen, H.E. Larsen, Steen Grüner Hanson

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearch


    We present a compact, low-cost optical method for detection of in-plane speckle translation, which e.g. could be a measure of in-plane translation or rotation of a solid structure. The speckles are produced by illuminating a non-specular target surface with coherent light. The scattered light propagates through free-space to the sensor inlet. The sensor is based on a lenticular array, which implements a narrow spatial band-pass filter, acting on the translating speckle patterns. The sensor detects speckle translation, which for the given configuration can be caused to detect both translation and rotation of the target. The presented free space propagation design can provide a sensor with no direct sensitivity on the working distance. The electrical signals from the sensor are processed with a digital algorithm, based on zero-crossings detection to provide real-time displacement measurements. The spatial filter of the sensor is characterized here, and the precision of the sensor, integrated with a processor, which applies zero-crossing detection to the signal, is considered.

    © 2004 COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
    Original languageEnglish
    Title of host publicationProceedings, Optical Correlation Devices Based on Diffractice Optical Elements, Including Optical and Digital Holography, Fractal Optics, and Optical Sensors
    EditorsO.V. Angelsky
    Place of PublicationBellingham, VA
    PublisherInternational Society for Optical Engineering
    Publication date2004
    Publication statusPublished - 2004
    Event6th International Conference ''Correlation optics'' - Chernivtsi, Ukraine
    Duration: 16 Sep 200319 Sep 2003
    Conference number: 6


    Conference6th International Conference ''Correlation optics''
    SeriesSPIE Proceedings Series, 5477


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