Patent ID: 7466879

Claim:
A fiber optic force sensor for measuring shear force, comprising: an optical fiber comprising at least one fiber core having a fiber optical axis; a Bragg grating being formed in a portion of the at least one fiber core of the optical fiber and having a grating optical axis coaxial to the fiber optical axis; a first stack of layers comprising an upper protection layer and an upper anchoring layer; and a second stack of layers comprising a lower anchoring layer and a lower protection layer; wherein the first stack of layers is arranged above the second stack of layers with the upper anchoring layer facing the lower anchoring layer, wherein a first portion of the optical fiber is threaded through a hole provided in the upper anchoring layer to be anchored between the upper anchoring layer and the upper protection layer, a second portion of the optical fiber is threaded through a hole provided in the lower anchoring layer to be anchored between the lower anchoring layer and the lower protection layer, and wherein the portion of the fiber core of the optical fiber comprising the Bragg grating is arranged between the anchored first and second portions of the optical fiber.