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Machine translation
1. (WO1979000841) SPECKLE INTERFEROMETRIC MEASUREMENT OF SMALL OSCILLATORY MOVEMENTS
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1979/000841    International Application No.:    PCT/GB1979/000043
Publication Date: 18.10.1979 International Filing Date: 09.03.1979
IPC:
A61B 1/227 (2006.01), A61B 1/267 (2006.01), G01H 9/00 (2006.01)
Applicants:
Inventors:
Priority Data:
9398/78 09.03.1978 GB
Title (EN) SPECKLE INTERFEROMETRIC MEASUREMENT OF SMALL OSCILLATORY MOVEMENTS
(FR) MESURE INTERFEROMETRIQUE A TACHE DE PETITS MOUVEMENTS OSCILLATOIRES
Abstract: front page image
(EN)Measurement of small oscillatory movements of an irregular surface (12) involves the production of a speckle pattern therefrom by coherent light illumination, and the arrangement of a photodetector (14) for direct response to such pattern, variations in photodetector output component at the frequency of the surface movement representing that movement. Another, stationary, illuminated irregular surface (13) can be involved to produce a speckle interference pattern for response of the photodetector (14) thereto and, in the case where the two surfaces (12, 13) are closely adjacent, a single beam can be used to illuminate the first and other surfaces predominantly and by stray light, respectively. This common beam illumination can be used in prior speckle interferometry. The first surface (12) can be an eardrum oscillated by a sound wave, suitably of swept frequency or impulse form, with detection of the photodetector variations respectively being in synchronous manner or by Fourier analysis, respectively.
(FR)Une mesure de petits mouvements oscillatoires d"une surface irreguliere (12) consiste a produire des taches d"interference par illumination de cette surface avec une lumiere coherente et a disposer un photodetecteur (14) captant directement les variations de l"intensite lumineuse; les variations de la composante de sortie du photodetecteur a la frequence du mouvement de surface representent ce mouvement. Une autre surface irreguliere illuminee, immobile (13) peut produire un dessin de taches d"interference en reponse au photodetecteur (14) et, dans le cas ou les deux surfaces (12, 13) sont adjacentes, un seul rayon peut etre utilise pour illuminer la premiere surface et la seconde surface de maniere predominante et par lumiere de diffusion, respectivement. Cette illumination par rayon commun peut etre utilisee en interferometrie a taches. La premiere surface (12) peut etre un tympan mis en vibration par une onde sonore, sous forme de frequence ou d"impulsion, avec detection des variations du photodetecteur de facon synchrone ou par analyse de Fourier, respectivement.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)