Patent ID: 6940062

Claim:
An adhesive method for an optical fiber curvature sensor that includes: a light source ( 20 ) for emitting a light; an optical fiber ( 10 ) having first and second ends, comprising an inside core ( 12 ) and an outside clad ( 14 ) of which some portion is eliminated by heat-treatment and in which a cutout-groove ( 16 ) is formed, said optical fiber being connected to said light source ( 20 ) at the first end; and a light receiving element ( 40 ) for measuring the intensity of light transmitting through said optical fiber ( 10 ) and connected to said optical fiber ( 10 ) at the second end, said method comprising the steps of: adhering said optical fiber ( 10 ) to a subject ( 50 ) bendable body part when said subject body part is in a curved state; and measuring a degree of curvature of said body part and simultaneously determining a direction of said curvature based on said intensity of light measured by the light receiving element.