Fast Gaussian fitting method applied to fiber Bragg grating wavelength demodulation

An optical fiber Bragg and wavelength demodulation technology, which is applied in the direction of using optical devices to transmit sensing components, convert sensor outputs, and measure devices, etc., can solve the problems of increased computational complexity, low demodulation speed, and high computational complexity.

Active Publication Date: 2016-07-20
武汉烽理光电技术有限公司
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Problems solved by technology

[0004] At present, the Gaussian fitting algorithm is used to demodulate the central wavelength of the fiber Bragg grating. Although the anti-noise performance and demodulation accuracy are relatively high, because the realization of the Gaussian fitting algorithm requires a large number of nonlinear operations, the computational com...

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  • Fast Gaussian fitting method applied to fiber Bragg grating wavelength demodulation
  • Fast Gaussian fitting method applied to fiber Bragg grating wavelength demodulation
  • Fast Gaussian fitting method applied to fiber Bragg grating wavelength demodulation

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Embodiment Construction

[0034] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0035] A kind of fast Gaussian fitting method that is applied to fiber Bragg grating wavelength demodulation designed by the present invention is characterized in that it comprises the following steps:

[0036] Step 1: The FPGA determines the number interval to be logarithmically calculated according to the fiber Bragg grating reflection spectrum data interval collected by the AD acquisition module, and establishes a hash table in the FPGA according to the internal resources of the FPGA;

[0037] Step 2: Approximately express the fiber Bragg grating reflection spectral density curve with a Gaussian function in the FPGA as:

[0038] I ( λ ) = I o e - 4 ln 2 ...

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Abstract

The invention discloses a fast Gaussian fitting method applied to fiber Bragg grating wavelength demodulation. The method comprises steps: 1, according to an acquired reflectance spectral data interval, a digital interval for logarithmic operation is determined, and a proper Hash table is built according to resources inside the system; 2, advanced operation is carried out on a fixed coefficient process decomposed through theoretical analysis and formula conversion, and an operation result is stored in a dependent variable for later use; 3, a look-up table method is adopted to calculating the natural logarithm of a sampled spectral value; and 4, a fitting process, that is, a fiber grating demodulation process, is carried out. The method can effectively solve the problem of limitations on the demodulation speed by the traditional Gaussian fitting algorithm and greatly improves the fiber grating demodulation speed on the premise of not reducing the demodulation precision and the demodulation range.

Description

technical field [0001] The invention relates to the technical field of fiber grating demodulation, in particular to a fast Gaussian fitting method applied to fiber Bragg grating wavelength demodulation. Background technique [0002] Fiber Bragg Grating FBG (Fiber Bragg Grating) has the characteristics of anti-electromagnetic interference, good electrical insulation, corrosion resistance, small size, light weight, small transmission loss, multi-point distributed measurement, and wide measurement range. It is widely used in civilian applications. Engineering, aviation, shipbuilding, electric power, petroleum, building structure health monitoring, complex mechanical system dynamic monitoring and other fields. With the continuous maturity of fiber grating sensing technology, its unique advantages have been gradually reflected in scientific research and production. [0003] The sensing principle of the fiber Bragg grating is based on the relationship between the center wavelengt...

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Application Information

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IPC IPC(8): G01D5/353
CPCG01D5/35367G01D5/3538
Inventor 李政颖王加琪包琨超陈晓威王洪海姜德生
Owner 武汉烽理光电技术有限公司
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