Patent ID: 8616069

Claim:
A fiber optic sensor based on spiral structure, compromising: by a multi-loop spiral member formed by a spring wire, wherein a plurality of first deformation teeth are continuously distributed on an upper surface and a lower surface of the spring wire in a longitudinal direction along the spring wire; in two adjacent loops of the spring wire, the first deformation teeth on the lower surface of the upper loop of the spring wire and the first deformation teeth on the upper surface of the lower loop of the spring wire correspond to each other in a staggered way; a first signal optical fiber is clamped between the first deformation teeth on the lower surface of the upper loop of the spring wire and the deformation teeth on the upper surface of the lower loop of the spring wire; the positions of both ends of the spiral member are changed when a stress is applied thereon, and the distance between the two adjacent loops of the spring wire in the spiral member is changed such that the position between the first deformation teeth on the lower surface of the upper loop of the spring wire and the deformation teeth on the upper surface of the lower loop of the spring wire in the two loops of the spring wire is changed, and as a result, the bend curvature of the first signal optical fiber clamped between the two deformation teeth is changed; and the first signal optical fiber is connected to a test unit via a transmission optical fiber.