Patent ID: 8005325
Filing Date: 2011-08-23
Classification: A61B,G01B,G01L,G02B

Abstract:
1. An apparatus for sensing a motion, the apparatus comprising: a length of an optical fibre comprising a Bragg grating; an element for reducing an impact of an external force that is transversal to the Bragg grating; a contact region coupled to a first portion of the length of the optical fibre and arranged so that movement of a further region, that is in direct or indirect contact with the contact region and moves relative to the apparatus in a direction along a portion of the apparatus, causes movement of the length of the optical fibre at the first optical fibre portion; and a holder arranged for reducing movement of the length of the optical fibre at a second portion of the length of the optical fibre when the optical fibre portion is moved at the first optical fibre portion; wherein the apparatus is arranged so that movement of the contact region relative to the holder causes a change in strain of the Bragg grating.