18 April 1978 Measurement In Real Time Of Transversal Micro-Vibrations (Down To 1 A) On Diffusing Objects: Random Moire Captors
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Proceedings Volume 0136, 1st European Conf on Optics Applied to Metrology; (1978) https://doi.org/10.1117/12.956181
Event: First European Conference on Optics Applied to Metrology, 1977, Strasbourg, France
Abstract
We studied an optical method of diffuse wave interferometry based on a random moire principle, permitting, in real time, the measurement of very small displacements or vibrations under experimental conditions which are unusual by reason of their weakly constrain-ing character. In fact, - the field of application is that of objects with unpolished surfaces, observed perpendicularly to this surface, for displacement vectors situated in the plane of this surface; - the setup demands only ordinary precision ; it is composed of a lighting system with two coherent (laser) waves and a low-resolution imagery system followed by a detector ; - the mode of operation consists in the detection of variations of lighting in a laser image granularity spot ; under certain conditions, these variations are propor-tional to the displacement of the point corresponding to the object ; - the performances : the sensitivity is interferometric ; the theoretical limit is on the order of 0.1Å√Hz standard experimental conditions. Values close to this limit have been attained experimentally. The precision of the measurements is on the order of 1%.
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D. Joyeux, D. Joyeux, } "Measurement In Real Time Of Transversal Micro-Vibrations (Down To 1 A) On Diffusing Objects: Random Moire Captors", Proc. SPIE 0136, 1st European Conf on Optics Applied to Metrology, (18 April 1978); doi: 10.1117/12.956181; https://doi.org/10.1117/12.956181
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