Apparatus for measuring physical properties of a sample

Details Apparatus for measuring physical properties of a sample Apparatus for measuring physical properties of a sample

G - Physics

01

N

G01N 21/45 (2006.01) G01B 11/06 (2006.01) G01N 21/17 (2006.01)

Patent

CA 2368278

The invention provides an apparatus for measuring the physical properties of a sample by optically monitoring the response of the sample to illumination by ultrashort optical pulses. The apparatus forms a common path optical interferometer of a Sagnac type that can measure physical properties at normal incidence. The interferometer is a two-arm Sagnac interferometer featuring three beam splitters. Measurement is performed in such a manner that a sample (14) is excited by a beam of ultrashort optical pulses, and variations in intensity and phase of another optical beam are detected. This enables a wide range of measurement of physical properties such as thickness, sound velocity, and thermal properties of substances.

L'invention concerne un instrument permettant de mesurer une propriété physique d'un échantillon par la détection optique de la réaction dudit échantillon à la projection d'une impulsion optique ultra-courte. L'invention concerne, en particulier, un interféromètre optique de Sagnac à chemin commun, qui sert à mesurer une propriété physique selon un angle d'entrée vertical. L'interféromètre, qui est un interféromètre du type Sagnac à deux bras, possède trois séparateurs de faisceau. L'échantillon (14) est excité par une impulsion optique ultra-courte, et on mesure les changements dans l'intensité et la phase du faisceau optique provoqués par cette excitation. Par conséquent, il est possible de mesurer une propriété physique parmi de nombreuses autres, notamment l'épaisseur d'un objet, une vitesse sonore ou une propriété thermique.

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