Method and apparatus for improving the dynamic range of...

Details Method and apparatus for improving the dynamic range of... Method and apparatus for improving the dynamic range of...

G - Physics

01

N

G01N 29/24 (2006.01) G01N 29/22 (2006.01) G01N 29/32 (2006.01) G01N 29/34 (2006.01)

Patent

CA 2435186

A system for identifying ultrasonic displacements in a material under test utilising a time-varying output pulse of a first laser beam. The system includes a seed laser light source for providing a laser beam, a modulating assembly in the path of propagation of the laser beam for time-varying of the laser beam, at least one optical isolation assembly placed in the path of propagation of the laser beam for preventing reflected laser light feedback into the seed laser light source, and at least one laser light amplification assembly placed in the path of propagation of the laser beam for amplifying the laser beam which passes the amplified time-varying output pulse of the laser beam.

L'invention concerne un système destiné à identifier des déplacements ultrasonores, dans un matériau à l'épreuve, par l'utilisation d'une impulsion de sortie, variable dans le temps, d'un premier faisceau laser. Le système comprend une source de rayonnement laser d'origine fournissant un faisceau laser, un assemblage de modulation placé dans le chemin de propagation du faisceau laser, destiné à faire varier le faisceau laser dans le temps, au moins un assemblage optique isolant disposé dans le chemin de propagation du faisceau laser afin d'empêcher un retour de rayonnement laser réfléchi dans la source de rayonnement laser d'origine, et au moins un assemblage d'amplification de rayonnement laser placé dans le chemin de propagation du faisceau laser, destiné à amplifier le faisceau laser, et duquel sort l'impulsion de sortie amplifiée, variable dans le temps, du faisceau laser.

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