A Method of Quickly Obtaining the Center Wavelength of Fiber Bragg Grating
A fiber Bragg and center wavelength technology, which is applied in the field of fast acquisition of the center wavelength of fiber Bragg gratings, can solve the problems of low wavelength efficiency of fiber Bragg gratings, and achieve the effect of less resources and high resolution
Active Publication Date: 2019-08-23
NANCHANG HANGKONG UNIVERSITY
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[0005] Aiming at the inefficiency of the traditional method to obtain the wavelength of Fiber Bragg Grating (FBG), the present invention proposes a fast and efficient processing method, and at the same time provides the flow chart of the fast peak-finding algorithm, and points out the software and hardware equipment for realizing the method
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[0020] The present invention is realized based on tunable fiber FP filter (FFP-TF) and two reference fiber Bragg gratings (FBG), and its overall structure, see figure 1 shown. Its hardware includes two parts: optical path and circuit. The optical path consists of an ASE broadband light source (C-band), a fiber circulator, two temperature-free reference fiber Bragg gratings (FBG), n sensing fiber Bragg gratings (FBG) and a tunable fiber FP filter (FFP-TF )composition. The circuit part is composed of a photodetector (PD), a programmable gate array (FPGA) development platform, a high-speed ADC / DAC module, and a driving signal amplification circuit. In the grating array, two reference fiber Bragg gratings (FBGs) and n sensing fiber Bragg gratings (FBGs) use wavelength as their unique identifier, that is, wavelength division multiplexing is adopted.
[0021] The working principle of the present invention is as follows:
[0022] The light source ASE-C outputs a continuous spectr...
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The invention relates to a method for rapidly obtaining the central wavelength of an optical fiber Bragg grating. Fiber Bragg gratings occupy an important position in the field of sensing due to the characteristics of all-fiber fabrication and wavelength modulation. Because fiber Bragg gratings have inherent properties of wavelength modulation, demodulating wavelength becomes the key in fiber Bragg grating sensing systems. Wavelength demodulation based on tunable optical fiber FP filter is currently the most mature method, but for fiber Bragg grating photoelectric signals with noise and a large amount of data, the processing process of the existing technology has high resource overhead, low efficiency, and poor effectiveness lack of. In view of the above disadvantages, the present invention proposes a method for quickly obtaining the center wavelength of the fiber Bragg grating. This method requires that the photoelectric signal of the fiber Bragg grating array be processed quickly and efficiently in the hardware, and then the supporting host computer calibrates the transmission characteristics of the tunable fiber FP filter in real time according to the processing results of the two reference fiber Bragg gratings, and then obtains the transmission characteristics. The center wavelength of the fiber Bragg grating.
Description
technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a method for rapidly obtaining the central wavelength of an optical fiber Bragg grating. Background technique [0002] Fiber Bragg Grating (FBG) occupies an important position in the field of sensing due to the characteristics of all-fiber fabrication and wavelength modulation. Especially in the fields of national defense science and industry, power system, and health monitoring of civil engineering projects, Fiber Bragg Grating (FBG) is an indispensable part. The sensing parameter has unique characteristics to the modulation of the center wavelength of the fiber Bragg grating (FBG), which makes the method of demodulating the sensing fiber Bragg grating (FBG) universal. This versatility is reflected in the fact that any processing of the fiber Bragg grating (FBG) array signal is to more accurately demodulate the central wavelength value of the fiber Bra...
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IPC IPC(8): G01M11/02G01D5/30
Inventor 唐晨飞万生鹏徐津何家祥杨思玉宋早标贾鹏陈瑞麟王浩宇付雪松谭超
Owner NANCHANG HANGKONG UNIVERSITY