Share Email Print
cover

Proceedings Paper

Measurement In Real Time Of Transversal Micro-Vibrations (Down To 1 A) On Diffusing Objects: Random Moire Captors
Author(s): D. Joyeux
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper 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%.

Paper Details

Date Published: 18 April 1978
PDF: 7 pages
Proc. SPIE 0136, 1st European Conf on Optics Applied to Metrology, (18 April 1978); doi: 10.1117/12.956181
Show Author Affiliations
D. Joyeux, Universite de Paris-Sud (France)


Published in SPIE Proceedings Vol. 0136:
1st European Conf on Optics Applied to Metrology
Michel H. Grosmann; Patrick Meyrueis, Editor(s)

© SPIE. Terms of Use
Back to Top