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Dynamic drift demodulation device and method for fiber grating

A fiber grating and demodulation device technology, which is applied in the direction of using optical devices to transmit sensing components and reduce unwanted effects, and can solve problems such as narrow demodulation range, low resolution of spectral analysis, and slow demodulation speed , to achieve the effect of large measuring range and dynamic range, simple structure of the device, and elimination of influence

Inactive Publication Date: 2012-05-09
SHANGHAI BOOM FIBER SENSING TECH
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Problems solved by technology

However, the spectral analysis method has low resolution, high price and slow demodulation speed; the demodulation speed of the interferometer method has been improved, but it is easily affected by external factors such as temperature; although the matching grating method is low in cost and fast in speed, the demodulation The narrow range cannot meet the requirements of large-scale changes; the adjustable F-P filter method, although the accuracy is higher than the spectral analysis method, still cannot meet the engineering requirements, and the cost is high

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  • Dynamic drift demodulation device and method for fiber grating
  • Dynamic drift demodulation device and method for fiber grating
  • Dynamic drift demodulation device and method for fiber grating

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Embodiment Construction

[0025] Below in conjunction with specific embodiment the implementation of technical scheme is described in further detail:

[0026] The device of the present invention relates to a fiber grating dynamic change demodulation device, which mainly includes a broadband light source 1, a coupler 2, a fiber grating 3, a circulator 4, an optical fiber semiconductor coating device 5, a photoelectric converter 6, a DC coupler 7, a filter Device 8, data processing 9, drive 10. The output end of the broadband light source 1 is connected to the input end of the coupler 2, the output end of the coupler 2 is connected to the input end of the fiber grating 3, the return end of the coupler 2 is connected to the input end of the circulator 4, and the output end of the circulator 4 is connected to the optical fiber The input terminal of the semiconductor coating device 5, the return terminal of the circulator 4 is connected to the input terminal of the photoelectric converter 6, the output term...

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Abstract

The invention discloses a dynamic drift demodulation device and method for a fiber grating and belongs to the technical field of fiber grating sensing. By virtue of the linear relationship between the reflected light power of a fiber semiconductor coated device and the wavelength change of incident light, the leftward / rightward offsets of the central wavelength of the fiber grating which is subjected to external modulations are demodulated, to generate light power signals which are convenient to measure, thus achieving the dynamical drift demodulation of the fiber grating.

Description

technical field [0001] The invention relates to the technical field of optical fiber grating sensing, in particular to the field of dynamic change demodulation of optical fiber gratings. Background technique [0002] With the continuous development of fiber optic sensing technology, fiber gratings have been widely used in industrial sites due to their characteristics of no electromagnetic interference, no electricity, corrosion resistance, small size, light weight, and high sensitivity. The demodulation technology of fiber gratings is also becomes more and more critical. At present, the demodulation of fiber grating mainly includes spectral analysis method, interferometer demodulation method, matched grating method, adjustable F-P filter method and so on. However, the spectral analysis method has low resolution, high price and slow demodulation speed; the demodulation speed of the interferometer method has been improved, but it is easily affected by external factors such as...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D3/028G01D5/353
Inventor 霍佃恒李旭皋魏席刚
Owner SHANGHAI BOOM FIBER SENSING TECH
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