Method of improving the contrast of images obtained using...

G - Physics – 01 – B

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G01B 1/00 (2006.01) G01B 9/02 (2006.01)

Patent

CA 2306162

To improve the contrast of images obtained using the pulsed image-addition ESPI technique and relative to a mechanically stressed object, a preliminary measuring cycle is performed, with the object in the unstressed condition, to obtain a predetermined number of interference images (110-160) differing from one another by a controlled phase shift of a fraction of the pulses traveling along one of the branches of the interferometer; a mean luminous intensity value is calculated (170) from the interference images, is memorized (180), and is subtracted (220) from each of the interference images obtained during the actual measuring cycle to improve the contrast of the images.

L'invention concerne un procédé permettant d'améliorer le contraste d'images obtenues à l'aide de la technique d'interférométrie électronique des formes de tachetures et addition d'images pulsées et par rapport à un objet soumis à une contrainte mécanique. Le procédé consiste à effectuer un cycle de mesure préliminaire alors que l'objet n'est soumis encore à aucune contrainte pour obtenir un nombre prédéterminé d'images d'interférence (110-160) différentes les unes des autres, par un décalage de phase commandée d'une fraction des impulsions se déplaçant le long d'une des branches de l'interféromètre. Une valeur d'intensité lumineuse moyenne est calculée (170) à partir des images d'interférence, et est mémorisée (180) puis soustraite (220) de chacune des images d'interférence obtenues pendant le cycle de mesure réel pour améliorer le contraste des images.

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