Patent
Dual-beam skin friction interferometer
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TLDR
In this paper, a portable dual-laser-beam interferometer is described that nonintrusively measures skin friction by monitoring the thickness change of an oil film at two locations while said oil film is subjected to shear stress.Abstract:
A portable dual-laser-beam interferometer is described that nonintrusively measures skin friction by monitoring the thickness change of an oil film at two locations while said oil film is subjected to shear stress. An interferometer flat is utilized to develop the two beams. Light detectors sense the beam reflections from the oil film and the surface thereunder. The signals from the detectors are recorded so that the number of interference fringes produced over a given time span may be counted.read more
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Journal ArticleDOI
Modern developments in shear-stress measurement ☆
TL;DR: In this article, three relatively modern categories of skin-friction measurement techniques are broadly classified as microelectromechanical systems (MEMS)-based sensors, oil-film interferometry, and liquid crystal coatings.
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Method and apparatus for evaluating the thickness of thin films
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Multi-beam optical probe and system for dimensional measurement
Marc Miousset,Jacques Fourot +1 more
TL;DR: In this article, a non-contact multi-beam optical probe was proposed for the dimensional measurement of objects. But it was not shown how to use it in the real world.
References
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Patent
Interferometric process and apparatus for the measurement of the etch rate of opaque surfaces
TL;DR: In this paper, an interferometer system and process for detecting etch rates in opaque materials, such as silicon or metal, has means for producing a pair of parallel light beams, one of which is directed to the surface of the opaque material and the other of which was directed to an adjacent transparent masking material.