Laser optical ultrasound detection

Details Laser optical ultrasound detection Laser optical ultrasound detection

G - Physics

02

F

349/48, 345/57

G02F 2/00 (2006.01) G01D 5/26 (2006.01) G01H 9/00 (2006.01) G01N 29/12 (2006.01) G01N 29/24 (2006.01) G01N 29/34 (2006.01) G02F 1/335 (2006.01)

Patent

CA 2007190

A laser ultrasound detection technique which is insensitive to laser intensity fluctuations, perturbation at the object surface and the like is disclosed. The invention consists of two substantially identical interferometers of the Fabry-Perot type or such an interferometer with a birefringent element in its optical cavity. The interferometers have resonance frequencies higher and lower than the laser frequency so that noises can be cancelled out by signal processing.

L'invention est une méthode de détection d'ultrasons au moyen d'un laser. Cette méthode est insensible aux fluctuations d'intensité du laser, aux perturbations à la surface de l'objet et autres effets similaires. L'invention utilise deux interféromètres du type Fabry-Pérot essentiellement identiques, ou un seul interféromètre de ce type ayant un élément biréfringent dans sa cavité optique. Les interféromètres ont des fréquences de résonance supérieure et inférieure à la fréquence du laser, de sorte que les bruits peuvent être annulés par un traitement du signal.

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