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A grating sensing device and method based on Brillouin filter

A grating sensing and filter technology, which is applied in the direction of using optical devices to transmit sensing components, measuring devices, converting sensor outputs, etc. The effect of simple system structure

Active Publication Date: 2018-06-08
NANJING UNIV
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Problems solved by technology

Commercial systems mainly use tunable optical filter method and scanning method, but the demodulation accuracy of tunable filter method will be affected by nonlinear effects such as temperature drift of the filter itself

Method used

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  • A grating sensing device and method based on Brillouin filter
  • A grating sensing device and method based on Brillouin filter
  • A grating sensing device and method based on Brillouin filter

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Embodiment Construction

[0037] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0038] Such as figure 1 Shown is a schematic structural diagram of the grating sensing system based on the Brillouin filter of the present invention, a grating sensing device based on the Brillouin filter, including a broadband light source, a first circulator, a sensing fiber grating, a Brillouin A filter, a synchronous signal module, a photodetector and a signal acquisition and processing module, the Brillouin filter includes an optical fiber section that produces the stimulated Brillouin scattering SBS effect, and a second circulator and a narrow linewidth tunable light source; wherein,

[0039] A broadband light source, used to output a wide-spectrum continuous signal light to the first port A of the first circulator;

[0040] The first circulator is used to output the wide-spectrum continuous signal light from its second port B to the sensing...

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Abstract

The invention discloses a grating sensing device based on a Brillouin filter. The grating sensing device comprises a broadband light source, a first circulator, a sensing optical fiber grating, the Brillouin filter, a synchronization signal module, a photoelectric detector and a signal acquisition and processing module. The Brillouin filter comprises an optical fiber section generating the stimulated Brillouin scattering SBS effect, a second circulator and a narrow linewidth tunable light source. Broad spectrum continuous signal light outputted by the broadband light source is outputted to the sensing optical fiber grating through the first circulator, and the reflected light meeting the Bragg's condition of reflection is generated and outputted to the optical fiber section through the first circulator. The narrow linewidth tunable light source outputs frequency sweep light to be outputted to the optical fiber section through the second circulator. The reflected light and the frequency sweep light are reversely transmitted in the optical fiber section to generate the SBS effect, and the amplified reflected light is outputted to demodulate the central reflection wavelength of the sensing optical fiber grating. The invention also discloses a method of the grating sensing device based on the Brillouin filter. The device is simple in structure and high in measurement precision.

Description

technical field [0001] The invention relates to the technical field of fiber grating sensing, in particular to a grating sensing device and method based on a Brillouin filter. Background technique [0002] Since the invention of optical fiber in the 1960s, various optical fiber active and passive devices have been a hot spot in research and application. With the introduction and development of the concept of the Internet of Things, fiber grating sensors have received extensive attention and research due to their excellent anti-electromagnetic interference, small size, corrosion resistance, easy embedding, and high sensitivity. Because the fiber grating sensor can realize the sensing of multiple parameters such as temperature and stress, it is widely used in many fields such as power communication, building bridges, petrochemical industry, aerospace, biomedicine and so on. [0003] When the fiber grating sensor is used for sensing, the change of the external environment only...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/353G01D5/38
CPCG01D5/35364G01D5/38
Inventor 许国良张旭苹曹品奇
Owner NANJING UNIV
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