| 摘要 |
There is disclosed a distributed optical fibre sensor for measuring vibration, as a concurrent function of position along each of a plurality of sensing optical fibres, from properties of probe light backscattered within the sensing optical fibres. The sensor comprises a probe light source arranged to generate pulses of probe light for transmission to the sensing optical fibres, a detector arranged to receive and detect probe light backscattered within the sensing optical fibres, an optical switch arranged to switch between the sensing optical fibres, so as to direct each generated probe light pulse to a currently selected one of the sensing optical fibres, and to direct backscattered probe light from a currently selected one of the sensing optical fibres to the detector, the sensor being arranged to control the optical switch such that all of the sensing optical fibres can be used concurrently to detect acoustic vibration, and an analyser arranged to determine vibration, as a concurrent function of position along each of the sensing optical fibres, from the detected backscattered probe light. |
