| 摘要 |
Provided is an optical fiber sensing system that can carry out measurement accurately without being affected by measurement noise factors other than the physical-quantity attribute of a measurement target object, for example, the effects of the emission power of a light source, fiber insertion loss, fluctuations in the sensitivity of a photo detector, fluctuations in the amplitude of an amplifier or other fluctuations, the loss of optical energy due to the bending of an optical fiber (bending loss), the loss of optical energy due to the connecting of two or more optical fibers by means of connectors (connector loss), the gain fluctuations of electric circuitry provided on a platform, and so forth. A reflective sensor is connected to an end of an optical fiber connected to a light source. The light source outputs physical measurement light. Reflected light coming from the reflective sensor is separated into two beams of light. Information on the physical quantity of a measurement target object is detected on the basis of an intensity ratio of the two beams.
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