| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical pressure sensor capable of detecting, even the minuter changes in pressure. SOLUTION: The inside of a cylindrical member 5 is partitioned into a first space S1 and a second space S2 by a partitioning member 7. The member is fixed so that the FBG section 31 of an optical fiber 3 is located in the first space S1, and that the FBG section 31 is not located in the second space S2. The first space S1 is sealed; and the second space S2 has an opening 8, capable of ventilation, an external fluid (air, water, etc.) is let into the space, and its pressure becomes equal to an outside pressure (external air pressure, hydraulic pressure). The partitioning member 7 is formed so as to be swayable in the longitudinal direction of the cylindrical member 5, together with the optical fiber 3; and when a difference is produced between the outside pressure and the predetermined inside pressure of the sealed space, the partitioning member 7 moves in either direction, and according to this, the FBG section 31 of the optical fiber 31 expands or contracts. COPYRIGHT: (C)2008,JPO&INPIT
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