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Proceedings Paper

Computer acquisition of 3D images utilizing dynamic speckles
Author(s): Alexei A. Kamshilin; Dmitry V. Semenov; Ervin Nippolainen; Erik Raita
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Paper Abstract

We present novel technique for fast non-contact and continuous profile measurements of rough surfaces by use of dynamic speckles. The dynamic speckle pattern is generated when the laser beam scans the surface under study. The most impressive feature of the proposed technique is its ability to work at extremely high scanning speed of hundreds meters per second. The technique is based on the continuous frequency measurements of the light-power modulation after spatial filtering of the scattered light. The complete optical-electronic system was designed and fabricated for fast measurement of the speckles velocity, its recalculation into the distance, and further data acquisition into computer. The measured surface profile is displayed in a PC monitor in real time. The response time of the measuring system is below 1 μs. Important parameters of the system such as accuracy, range of measurements, and spatial resolution are analyzed. Limits of the spatial filtering technique used for continuous tracking of the speckle-pattern velocity are shown. Possible ways of further improvement of the measurements accuracy are demonstrated. Owing to its extremely fast operation, the proposed technique could be applied for online control of the 3D-shape of complex objects (e.g., electronic circuits) during their assembling.

Paper Details

Date Published: 9 June 2006
PDF: 9 pages
Proc. SPIE 6252, Holography 2005: International Conference on Holography, Optical Recording, and Processing of Information, 62521E (9 June 2006); doi: 10.1117/12.677058
Show Author Affiliations
Alexei A. Kamshilin, Kuopion Yliopisto (Finland)
Dmitry V. Semenov, Kuopion Yliopisto (Finland)
Ervin Nippolainen, Kuopion Yliopisto (Finland)
Erik Raita, Oy Optoinspection Ltd. (Finland)

Published in SPIE Proceedings Vol. 6252:
Holography 2005: International Conference on Holography, Optical Recording, and Processing of Information
Yury Denisyuk; Ventseslav Sainov; Elena Stoykova, Editor(s)

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