Distributed optical fiber sensing system

A distributed optical fiber and sensing system technology, applied in the field of optical sensing systems, can solve problems such as inability to achieve long-distance transmission, nonlinear effects of optical fibers, and stimulated Raman scattering

Active Publication Date: 2014-02-12
SUZHOU GUANGGE EQUIP
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Problems solved by technology

However, with the increase of the pulse pump light power, the nonlinear effect of the fiber appears, and even the stimulated Raman scattering effect appears.
Once stimulated Raman scattering occurs, the Raman signal will increase abnormally, making it impossible to demodulate normal sensing information
In the commonly used distributed optical fiber sensing system, the pulsed pumping light is generally injected into the sensing fiber nearby, and the pu

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  • Distributed optical fiber sensing system
  • Distributed optical fiber sensing system

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Embodiment Construction

[0014] Please refer to figure 1 , one embodiment provides a distributed optical fiber sensing system, the distributed optical fiber sensing system includes a Raman pulsed pumping light source 110 that generates Raman pulsed pumping light, and is connected to the Raman pulsed pumping light source 110 through an optical fiber The first pumping optical splitter 120 that splits the Raman pulsed pumping light generated by it according to the power, the first wavelength division multiplexer 130 connected to the first pumping optical splitter 120 through optical fibers, and the second A wavelength division multiplexer 130 is connected to the Raman pulsed pumping light source 110 and the Raman signal processing control device 140 for analyzing and processing the optical signal is connected to the first pumping optical splitter 120 through an optical fiber and prevented from being stimulated. The first Raman signal attenuator 150 where the Mann scattering signal appears, the second wav...

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Abstract

A distributed optical fiber sensing system comprises a Raman pulse pump light source for generating Raman pulse pump light, a first pump light branching device, a first Raman signal attenuator, a first wavelength division multiplexer, a second wavelength division multiplexer, a first sensing optical fiber, a second sensing optical fiber and a Raman signal processing and control device. The distributed optical fiber sensing system branches the Raman pulse pump light generated by the Raman pulse pump light source through the first pump light branching device so as to reduce power and processes one path of the Raman pulse pump light through the first Raman signal attenuator so as to prevent the stimulated Raman scattering effect, and therefore long-distance transmission is achieved.

Description

technical field [0001] The invention relates to an optical sensing system, in particular to a distributed optical fiber sensing system. Background technique [0002] In recent years, the distributed optical fiber sensing system based on the Raman scattering effect has been developed rapidly. However, because the Raman scattering signal light is very weak, the signal intensity is generally increased by increasing the pulse pump light power. However, with the increase of the pulse pump light power, the nonlinear effect of the fiber appears, and even the stimulated Raman scattering effect appears. Once stimulated Raman scattering occurs, the Raman signal will increase abnormally, making it impossible to demodulate normal sensing information. In the commonly used distributed optical fiber sensing system, the pulsed pumping light is generally injected into the sensing fiber nearby, and the pulsed pumping light and Raman signal light are transmitted in the same fiber, so the high...

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Application Information

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IPC IPC(8): G01D5/36
Inventor 陈志标
Owner SUZHOU GUANGGE EQUIP
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