Speckle interference method for remote thickness measurement of a sheet and layer and an apparatus therefor

AuthorSearch for:
TypeTechnical Report
Series titleUnited States Patent
Subjectspeckle; remote; apparatus
AbstractA method and an apparatus are disclosed for remotely determining the thickness of a transparent or semi-transparent suspended sheet or solid or liquid layer, e.g. ice, on a solid surface which is either light-absorbent or highly reflective. The invention proposes directing a coherent beam of light onto a location on the layer such that the beam undergoes partial reflection from the top of the layer and partial reflection from the bottom of the layer or the underlying surface. Due to the coherency of the beam, two overlapping speckle patterns are produced which give rise to an interference pattern having interference fringes. The pattern can be caused to shift across the field of view and the shift, determined by a number of the passing interference fringes can be interpreted in terms of the thickness of the layer.
Publication date
AffiliationNRC Institute for Ocean Technology; National Research Council Canada
Peer reviewedNo
NRC number5807
NPARC number8895555
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Record identifierb2a9e777-53f4-4f44-993a-923eb8eb3b14
Record created2009-04-22
Record modified2016-10-03
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