| 摘要 |
An optical fiber sensor which can be used in an optical fiber communication line such as the Internet and connected with an optical fiber communication line capable of sharing a sensor line with the communication line. The optical fiber sensor comprises optical fibers (11d, 11b, 11e) each consisting of a core and a cladding formed on the outer circumference of the core, and so formed as to be optically coupled with optical fiber communication lines (10, 11a). The optical fibers are an optical fiber sensor line having sensor portions (SPa, SPb, SPc, SPd) allowing interaction of a part of transmitted light with the outside and including a portion (11b) for transmitting communication light at least from the optical fiber communication line. The optical fiber sensor further comprises a light source (15) for emitting sensor light to the incident end of the optical fiber sensor line, and a light receiving portion (15) for detecting the sensor light emitted from the exit end of the optical fiber sensor line through the sensor portion.
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