Patent ID: 7197934
Filing Date: 2007-04-03
Classification: G01L

Abstract:
1. An optical fiber pressure detector for detecting pressure variations in at least one medium in relation to a reference medium, comprising at least one deformable element inside a body, exposed on one side to the reference medium and, on the opposite side, to a pressure to be measured, at least one optical fiber at least a portion of which is connected on one side to deformable element and, on the opposite side, to a reference point, and whose stress varies with the displacements of the deformable element, this optical fiber portion comprising at least one optical grating, an optical system for detecting the deformations undergone by each optical grating as a result of the pressure variations undergone by the deformable element and means for adjusting the stress applied to the optical fiber, characterized in that the deformable element comprises a bellows provided with a base fastened to body, the reference point being formed by means of a device comprising a rigid tube provided with a bottom, resting at its end opposite the bottom against base of the bellows, a rigid element translatable in the direction of elongation of the optical fiber, which rests against bottom of rigid tube by means of adjustable spacing means, and retention means allowing the optical fiber portion to be fastened to rigid element.