Unbalanced interferometer based fiber bragg grating (FBG) demodulation system and method

A fiber grating demodulation and interferometer technology, which is used in optical demodulation, optics, instruments, etc., can solve the problems of unsatisfactory mutation signal responsivity, difficulty in demodulation and multiplexing, etc., and achieves good linearity and easy complexation. Useful, large dynamic range effects

Inactive Publication Date: 2011-08-10
DALIAN UNIV OF TECH
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Problems solved by technology

Most of the current FGB sensing systems have their own advantages and disadvantages, and it is difficult to solve the problems of demodulation and multiplexing, especially the unsatisfactory response to mutation signals.

Method used

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  • Unbalanced interferometer based fiber bragg grating (FBG) demodulation system and method
  • Unbalanced interferometer based fiber bragg grating (FBG) demodulation system and method
  • Unbalanced interferometer based fiber bragg grating (FBG) demodulation system and method

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Embodiment Construction

[0015] The specific embodiments of the present invention will be described in detail below in conjunction with the technical solutions and accompanying drawings.

[0016] like figure 1 and figure 2 As shown, the present invention uses a common broad-spectrum light source covering the wavelength range of 1520-1560 nm. The sensing fiber grating is transmitted through a circulator or a coupler, and the narrow-band optical signal sensitive to external physical parameters reflected by the sensing fiber grating enters an unbalanced Michelson interferometer or a Mach-Zehnder interferometer with an optical path difference of d between the two arms. The unbalanced Michelson interferometer or Mach-Zehnder interferometer converts the wavelength change of the optical signal reflected by the fiber Bragg grating into an interference signal with a phase change. The phase change of the interference signal caused by the wavelength change is wound on the piezoelectric ceramic device along th...

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Abstract

The invention relates to an unbalanced interferometer based fiber bragg grating (FBG) demodulation system and method, belonging to the technical field of fiber optic sensing. The system sequentially passes through a superluminescent diode (SLD) or an amplified spontaneous emission (ASE) broadband light source, an optic isolator, a circulator or a coupler, and a fiber bragg grating and returns back to the circulator or the coupler, and then passes through the coupler, an unbalanced Michelson interferometer with two channels and a Faraday rotator mirror and returns back to an interferometer and the coupler or passes through a Mach-Zehnder interferometer with two channels and the coupler, wherein one channel of the interferometer is wound around a piezoelectric ceramic or an electrooptical modulator, and an acousto-optic modulator, finally passes through a dense wave division multiplexer and a photoelectric detector and is connected with an ARCTAN based PGC (Phase Generation Carrier) signal response demodulation module. The invention has the advantages; by adopting the combination of the an FBG sensor and ARCTAN-based PGC phase modulation, the system has high sensitivity, large dynamic range and good linearity, good response to an abrupt signal and easiness of multiplexing, low cost and easiness of implementing.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and relates to an optical fiber grating sensor demodulation system based on an unbalanced interferometer and a demodulation method thereof. Background technique [0002] As the development of Fiber Bragg Grating (FBG) sensor technology is getting closer to practical application, demodulation technology has become the key point of FBG sensor. The basic principle of the FBG sensing system is to convert the measured change into a small change in the center wavelength of the fiber grating, and then into a corresponding change in the demodulation system. Therefore, the demodulation accuracy of the demodulation device in the FBG sensor directly affects the The detection accuracy of the whole system. [0003] Several elements must be considered for an FBG sensing system: system resolution, sensitivity, dynamic range, whether it is easy to multiplex, response to signals, and legibility of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F2/00G01D5/26
Inventor 荆振国彭伟于奇
Owner DALIAN UNIV OF TECH
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