| 摘要 |
<p>A system and method to sense the application of transverse stress to an optical fiber include a light source (32) that produces a relatively wide spectrum light beam, an optical fiber (22), a grating (26) within the fiber, and a spectrum analyzer (54). The light beam is reflected off or transmitted through the optical grating in the core (24) of the optical fiber that is transversely stressed directly by exposure to pressure. When transversely stressed, the optical grating produces a reflection or transmission of the light beam that has two peaks or minimums in its frequency spectrum whose spacing and/or spread are indicative of the forces applied to the fiber. One or more detectors sense the reflection or transmission from the optical grating to produce an output representative for the applied forces. Multiple optical gratings and detectors may be employed to simultaneously measure temperature or the forces at different locations along the fiber.</p> |
