Patent ID: 8317723

Claim:
A pressure sensor for connecting to a detector, said pressure sensor comprising: an optical fibre having a distal end with a distal plane for sensing pressure, a proximal end for communicating with a patch cord, and an in-fibre Bragg grating (FBG) situated proximate the distal end, a housing having a distal aperture, a proximal aperture and a bore therebetween, said housing sized to accept said optical fibre and said FBG, said FBG being housed in said housing and the housing configured so that the FBG is responsive to an axial component of a force produced by a fluid pressure at the distal end of the fiber and to attenuate coupling of radial components of the force to the FBG, an annular ring forming a flexible seal between said optical fibre and said housing at least distal to said FBG, and a holder configured to retain said housing, such that axial strain is transferred to said in-fibre Bragg grating housed within said housing by the fluid pressure at the distal end of the fiber.