| 摘要 |
A fiber optic interferometric sensor system utilizing a reference transducer and an optical source having a very short coherence length, typically about 80 microns. The optical source is used to activate a remotely located fiber optic sensor which has an optical path defference between two reflecting surfaces such that the reflected optical beams are incoherent for the optical source used. The reflected beams are then coupled to a reference transducer, located remotely from the sensor and preferably near the electronic processing circuitry. The reference transducer is designed with an optical path length difference to produce a coherent combination for the optical path length differences of both the sensor and the reference transducer thereby forming a highly sensitive interferometer.
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