OPTICAL FIBRE SENSORS AND METHODS FOR SENSING

摘要

A multi-mode fibre optic sensor for optically sensing a physical perturbation includes a multi-mode optical fibre segment (14) which accepts coherent monochromatic radiation from a suitable source (12). As the radiation is propagated in the fibre (14), the various modes form a complex interference pattern which changes in response to a physical perturbation of the fibre. A detector (16) provides an output signal to a signal processor (18) which analyzes the signal as a function of the change in intensity to provide an information signal functionally related to the perturbation.