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Allfiber type long period fiber grating solution multi-parameter sensing system

A fiber grating and sensing system technology, applied in the direction of transmitting sensing components, measuring devices, instruments, etc. by using optical devices, can solve problems such as low signal-to-noise ratio, low cost performance, and difficulty in realizing remote monitoring, etc., to improve measurement resolution rate effect

Inactive Publication Date: 2012-01-18
DONGHUA UNIV
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Problems solved by technology

Therefore, the current long-period fiber grating multi-parameter system is usually low in cost performance, difficult to realize remote monitoring and poor in repeatability, and the signal-to-noise ratio of the measurement is not high, which affects the accuracy of the measurement

Method used

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  • Allfiber type long period fiber grating solution multi-parameter sensing system
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  • Allfiber type long period fiber grating solution multi-parameter sensing system

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Embodiment Construction

[0033] Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0034] Embodiments of the present invention relate to an all-fiber long-period fiber grating multi-parameter sensing system, such as figure 1As shown, it includes a broadband light source 1, a composite long-period fiber grating 3, a first 2×2 fiber coupler 4, a first Bragg fiber grating 5, a refractive index matching liquid 6, a fiber isolator 7, and a second 2× 2 Fiber coupler 8, second Bragg fiber grating 9, photoelect...

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Abstract

The invention relates to an allfiber type long period fiber grating solution multi-parameter sensing system. Broadband light source output light enters the input end of a 2*2 fiber coupler by a compound long period fiber grating; one path of output light of the 2*2 fiber coupler enters a first fiber Bragg grating; the other path of the output light enters a second fiber Bragg grating by a fiber isolator; the reflected light of the two fiber Bragg gratings is collected by a data capture card after entering a photoelectric conversion module and a signal amplifier; and a computer carries out data processing and real-time measurement result display. In the multi-parameter sensing system, the compound long period fiber grating serves as the sensitive elements of a plurality of parameters, matched fiber Bragg gratings serve as signal demodulation elements to realize the allfiber type multi-parameter sensing system. The allfiber type long period fiber grating solution multi-parameter sensingsystem has the advantages of electromagnetic interference, allfiber type measurement and the like and can be remotely monitored.

Description

technical field [0001] The invention relates to the technical field of fiber grating sensing, in particular to an all-fiber long-period fiber grating sensing system with multi-parameter measurement function. Background technique [0002] The real-time monitoring of solution concentration and temperature is an important part of industrial engineering quality control in some fields, and it is also an important technical means in the fields of water pollutant monitoring and environmental monitoring. A fiber grating is an optical element that establishes a certain spatial refractive index periodic distribution in an optical fiber, so that the propagation characteristics of light can be changed in it. Long-period fiber grating (LPG) is a kind of transmission grating. Its resonance wavelength and resonance intensity are very sensitive to changes in the external environment. The resonance peak wavelength of the long-period fiber grating needs to meet the phase matching condition, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D21/02G01D5/353G01D5/38
Inventor 詹亚歌罗君许毓敏余木火
Owner DONGHUA UNIV
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