Method and device for detecting fundamental natural modes of...

Details Method and device for detecting fundamental natural modes of... Method and device for detecting fundamental natural modes of...

A - Human Necessities

61

B

A61B 3/16 (2006.01)

Patent

CA 2425173

The invention concerns a method which consists in: positioning the eye (3) relative to a detecting device (1) so as to form with said device a Fabry-Pérot cavity with main optical axis (A1) and comprising two opposite reflecting surfaces along the main optical axis (A1), one of the two surfaces being formed by a fixed reflective element (M1) and the other being formed by the cornea (2) of the eye; injecting in said Fabry-Pérot cavity an incident laser beam (F) centred on the main optical axis (A1) of the Fabry-Pérot cavity, the lateral and longitudinal alignments of the cornea (2) relative to the main optical axis (A1) being produced so as to obtain longitudinal interferences between the reflected initial and return laser beams between the two reflective surfaces of the cavity, and in detecting with an optoelectronic sensor (7) the intensity (I) in time of said interferences. The invention is useful for measuring intraocular pressure.

On positionne l'oeil (3) par rapport à un dispositif de détection (1) en sorte de former avec ce dispositif une cavité de Pérot-Fabry d'axe optique principal (A1) et comportant deux faces réflectives opposées selon l'axe optique principal (A1), une de ces deux faces étant constituée par un élément réflectif (M1) fixe et l'autre étant formée par la cornée (2) de l'oeil. On injecte dans cette cavité un faisceau laser (F) incident centré sur l'axe optique principal (A1) de la cavité Pérot-Fabry, les alignements latéral et longitudinal de la cornée (2) par rapport à l'axe optique principal (A1) étant réalisés en sorte d'obtenir des interférences longitudinales entre les faisceaux laser aller et retour réfléchis entre les deux faces réflectives de la cavité, et on détecte au moyen d'un détecteur optoélectronique (7) l'intensité (I) dans le temps de ces interférences. Application: mesure de la pression intra-oculaire.

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