| 主权项 |
1. A method for conducting fast Brillouin optical time domain analysis for dynamic sensing of optical fibers, the method comprising:
injecting a pump pulse signal into a first end of an optical fiber; injecting a probe signal into a second end of an optical fiber, wherein the probe and the pump pulse signals exhibit a frequency difference therebetween that is appropriate for an occurrence of a Brillouin effect, in which the probe signal is amplified by a Brillouin effect, to yield a probe wave whose gain corresponds to matching between the fiber physical properties and the pump-probe waves frequency difference, at each point along the fiber, at any point of time; alternating the frequency of either the probe or the pump signals, so as the alternated signal exhibits a series of signal sections, each signal section having a predefined common duration and a different frequency; measuring the Brillouin probe gain for each one of the alternating frequencies; extracting, by a computer processor, physical properties of the optical fiber throughout its length at sample points associated with the sampled time and the frequencies, based on the measured Brillouin probe gain, to yield a dynamic analysis of the physical properties of the optical fiber; and repeating the alternating with an identical series of signal sections, wherein the measuring is further repeated for each respective alternating frequency and averaged, so that the extracting is applied to averaged Brillouin probe gain, for improving the signal to noise ratio. |
