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Coherent multiplexing method for optical fiber Bragg raster sensor and apparatus thereof

A grating sensor, fiber Bragg technology, applied in the coupling of optical waveguides, etc., can solve the problems of high-cost light source demodulation system, limited practical application, and high cost of FBG sensor network.

Inactive Publication Date: 2007-01-31
ZHEJIANG UNIV
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Problems solved by technology

Both sets of multiplexing technologies require high-cost light sources and complex demodulation systems, which directly lead to the high cost of the FBG sensor network and limit many of its practical applications.

Method used

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  • Coherent multiplexing method for optical fiber Bragg raster sensor and apparatus thereof
  • Coherent multiplexing method for optical fiber Bragg raster sensor and apparatus thereof
  • Coherent multiplexing method for optical fiber Bragg raster sensor and apparatus thereof

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Embodiment Construction

[0019] Such as figure 1 As shown, taking the serial connection as an example, multiple FBG pairs with different grating center distances are connected to the sensor 5 (composed of the reference FBG 3 and the sensing FBG 4) through the optical fiber 6, and the input end is through the ② port of the circulator 2 The ① port is connected with the optical signal of the light source 1, the input end of the photodiode 7 of the ③ port of the circulator 2 is respectively connected with the optical signal of one side of the 2×2 fiber coupler 12, and the output end of the photodiode 7 is electrically connected with the data acquisition card 8 . The other side of the 2×2 fiber optic coupler 12 is respectively connected to two optical fiber collimators 11 for optical signals, and two mirrors 10 are arranged corresponding to the positions of the two fiber collimators 11, one of which is controlled by a stepping motor 9 Its position moves. The above-mentioned multiple FBG pair sensors 5 ar...

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Abstract

The invention relates to a coherent diplex method for optical fiber Prague grating sensor and the device to realize the method. The output of normal light source connects to the port optical signal of circulator 1, and the port of circulator 2 is connecting to FBG pare sensor array optical signal, and the port of circulator 3 and the input end of photodiode connect to the optical signal of 2*2 optical fiber coupler. The output end of photodiode connects to data acquisition card. And the other side of 2*2 optical fiber coupler is connected to optical signal of two optical fiber collimator. Two reflecting mirrors are set corresponding to two optical fiber collimators and one could control the movement by step motor. The invention has low making complex and saves system cost.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a method for coherent multiplexing of an optical fiber Bragg grating sensor and equipment for realizing the method. Background technique [0002] Fiber Bragg Grating (FBG) has become an important device for optical fiber sensing due to its unique advantages such as internal sensitivity of optical fiber, wavelength coding, and easy networking. Based on the developed wavelength division multiplexing (WDM) and time division multiplexing (TDM) technologies, fiber grating arrays are widely used in optical fiber quasi-distributed sensing, such as: real-time health monitoring of buildings, bridges, dams, etc., backbone Temperature monitoring along transmission lines. Among them, WDM requires each FBG sensor to work at different reflection wavelengths, requires a broadband light source (bandwidth is often greater than 40nm) as the input light source, and also r...

Claims

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Application Information

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IPC IPC(8): G02B6/34G02B6/42
Inventor 管祖光陈达如何赛灵
Owner ZHEJIANG UNIV
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