Distributive optical fiber vibration sensing system based on wave division multiplex technology

Abstract

The invention discloses a distributive optical fiber vibration sensing system based on the wave division multiplex technology, which comprises a vibration position detector and a vibration frequency detector. According to the invention, the vibration position detector and the vibration frequency detector share a long-distance sensing optical fiber by a special structure. The distributive optical fiber vibration sensing system has the beneficial technical effects that under the condition of simultaneously obtaining the vibration position signal and vibration frequency signal, the length of the long-distance sensing optical fiber required to be arranged is greatly shortened, and the system cost is saved; and based on the mature wave division multiplex technology, the accuracy of two optical signal is guaranteed, so that the system can realize high-precision detection on the vibration position signal and the vibration frequency signal.

Description

technical field [0001] The invention relates to a distributed optical fiber vibration sensing system, in particular to a distributed optical fiber vibration sensing system based on wavelength division multiplexing technology. Background technique [0002] Vibration measurement has potential application value in engineering fields, such as structural health monitoring, aerospace, petrochemical, power system and other safety monitoring; traditional vibration measurement methods such as mechanical measurement and electrical measurement have low sensitivity and large volume 1. The measurement range is limited by the amplification device, and the traditional vibration measurement method can only perform point measurement, which is limited in practical application. Therefore, it is imperative to develop a high-performance vibration measurement system. [0003] Distributed optical fiber sensing technology refers to the continuous modulation of the light wave in the optical fibe...

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Problems solved by technology

[0004] In the prior art, the research on the vibration sensing system based on optical fiber technology has been very extensive, but the existing measurement methods generally have the problem that the vibration frequency measurement and the vibration position measurement are difficult to balance, so two systems must be arranged in the measurement space, one One set is used for vibration frequency measurement, and the other is used for vibration position measurement. In order to realize fully distributed monitoring of a large area, the length of the sensing fiber must be long enough. If two sets of measurement systems are arranged at the same time, the length of the sensing fiber required It will be double that of a single system, resulting in a substantial increase in system cost

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