Precise positioning type optical fiber distributed vibration sensor
An optical fiber distributed, vibration sensor technology, applied in the field of photoelectric sensing, can solve the problems of signal fading, interferometer phase gradual change, inaccurate, reliable sensing positioning, etc., to achieve low additional cost, high reliability and accuracy , to avoid the effect of non-reciprocal phase deviation
Inactive Publication Date: 2012-05-09
北京奥普科达科技有限公司
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[0013] The embodiment of the present invention provides a precise positioning optical fiber distributed vibration sensor, which is used to solve the problem that the interferometer phase changes slowly due to the use of single-mode optical fiber in the existing interferometer type optical fiber distributed vibration sensor, so that it cannot be accurately and reliably The problem of sensor positioning
In addition, the embodiment of the present invention also solves the problem of signal fading caused by polarization-induced birefringence in the existing interferometer-type optical fiber distributed vibration sensor
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[0040] Due to the long sensing fiber in the optical fiber distributed vibration sensor in the prior art, a relatively low-cost single-mode fiber is usually used, so there are problems of interferometer phase gradient in the sensor and signal fading caused by polarization-induced birefringence. The embodiment of the present invention uses the phase carrier modulation and demodulation technology to improve the existing dual Mach-Zehnder interferometer type optical fiber distributed vibration sensor, in which the phase modulation of the optical path signal is performed by setting the signal modulation module, and the interference of the sensor A signal demodulation module is set at the signal output end to demodulate the modulated optical path signal, thereby eliminating the influence of slow phase change on sensor positioning. In addition, the embodiment of the present invention can further adopt the polarization control technology, and add a polarization controller in the optica...
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The invention discloses a precise positioning type optical fiber distributed vibration sensor. A signal modulation module is added in the existing dual Mach-Zehnder interferometer type optical fiber distributed vibration sensor for phase modulation of optical signals in the sensor. Nonreciprocal phase offset of two paths of interference optical signals output by the precise positioning type optical fiber distributed vibration sensor. A first signal detection module and a second signal detection module are added for converting the output two paths of interference optical signals into the digital signals to be demodulated. Simultaneously, the output end of the sensor provided by the invention is provided with a signal demodulation module which is used for digital demodulation of the digital signals to be demodulated so as to obtain actual vibration signals. The sensor provided by the invention can effectively solve the problem of nonreciprocal phase deviation of the existing interferometer type optical fiber distributed vibration sensor as a result of long-distance operation of the interferometer, and has the advantages of high reliability and accuracy, low cost and easy realization.
Description
technical field [0001] The invention relates to the technical field of photoelectric sensing, in particular to a precise positioning optical fiber distributed vibration sensor. Background technique [0002] The optical fiber distributed sensor can measure the vibration information that changes with time along the entire length of the optical fiber. It has the advantages of high sensitivity, long detection distance, strong anti-electromagnetic interference ability, and easy maintenance after installation. Therefore, it is used in long-distance optical cable protection, oil pipeline monitoring and It has important implications in other areas of structural monitoring. [0003] At present, according to the difference in working principle, optical fiber distributed sensors can be divided into four types: double interferometer type, optical time domain reflectometer type, intensity modulation type and scattering type. Among them, the dual-interferometer optical fiber distributed ...
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IPC IPC(8): G01H9/00
Inventor 林明霞
Owner 北京奥普科达科技有限公司