Authors: T.W. Nga; C.S.B. Lim

Source: Journal of Holography and Speckle, Volume 1, Number 1, March 2004 , pp. 58-62(5)

Publisher: American Scientific Publishers

Abstract:

The speckle correlation encoder technique is often used to measure in-plane displacements although it is capable of out-of-plane displacement measurements as well. The theory behind the out-of-plane measurement mode is outlined here, as is the experimentation conducted to verify its feasibility. An error analysis reveals that a laser illumination angle of 45° is ideal for reducing measurement errors as a result of improper determination of the illumination angle in this mode. The o ut-of-plane displacement-measuring capability of the electronic speckle correlation technique was then utilized in a cantilever-based device designed to determine magnetic forces. This device offers the advantages of easy usage and convenient variation of measurement sensitivity.

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Keywords: ELECTRONIC SPECKLE PATTERN INTERFEROMETRY; SPECKLE CORRELATION; DISPLACEMENT MEASUREMENT; MAGNETIC FORCE SENSING

Document Type: Research article

DOI: http://dx.doi.org/10.1166/jhs.2004.009

Publication date: 2004-03-01

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• The growing interest and activity in the fields of holography and speckle require a forum for rapid dissemination of important results. Journal of Holography and Speckle (JOHAS) is that international forum which offers scientists and engineers timely, peer-reviewed research in these fields. Journal of Holography and Speckle publishes original rapid communications, full research papers and timely state-of-the-art reviews (with author's biography and photo) encompassing the fundamental and applied research in all areas of holography, and speckle.
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