FIBER OPTIC STRAIN GAUGE

• Main Authors: HIROSE KOJI, KAWARADA MINORU, NEMOTO ISAMU
• Format: Patent
• Language: English
• Published: 29.05.1998
• Edition: 6
• Subjects: MEASURING; MEASURING ANGLES; MEASURING AREAS; MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER,MECHANICAL EFFICIENCY, OR FLUID PRESSURE; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS; MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS; TESTING

PROBLEM TO BE SOLVED: To provide a fiber optic strain gauge which has a small strain transmission loss, can be easily stuck to an object, and has high accuracy. SOLUTION: An optical fiber 11 is coupled with a light emitting section and a light receiving section at one end. The opening of a sleeve 12 at one end is sealed with the optical fiber 11 in a state where the other end section of the fiber 11 is inserted into the sleeve through the opening and the front end of the fiber 11 reaches the intermediated position of the sleeve 12 or its vicinity. A reflecting member 13 is composed of a stepped columnar member from which a wire section 13a is protruded. At the front end of the wire section 13a, a reflecting surface is formed. A base material 14 has an opening 14a of a similar figure to the external shape of the material 14 at the central part of the rectangle platy body of the material 14. The sleeve 12 housing the fiber 11 and the reflecting member 13 are stuck and fixed to the base material 14 in advance. In the hollow section of the sleeve 12, the reflecting surface at the front end of the wire section 13a is faced to the front end face of the fiber 11 with a prescribed clearance in between.