Double parameter measuring method basing on long period optical-fiber grating to sen sor

A technology of long-period gratings and fiber gratings, applied in the direction of transmitting sensing components with optical devices, to achieve real-time on-line monitoring, high measurement accuracy, and low cost

Inactive Publication Date: 2006-05-24
ZHEJIANG UNIV
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  • Double parameter measuring method basing on long period optical-fiber grating to sen sor
  • Double parameter measuring method basing on long period optical-fiber grating to sen sor
  • Double parameter measuring method basing on long period optical-fiber grating to sen sor

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Embodiment Construction

[0018] Such as figure 1 As shown, the input end of the long-period fiber grating pair sensor 3 is connected to the optical signal of the broadband light source through the unidirectional isolator 2, and the output end and the input end of the photodiode 7 are connected to the optical signal at both ends of the 3-dB fiber coupler 4, The output terminal of the photodiode 7 is electrically connected with the data acquisition card 8 . The two ends of the other side of the 3-dB fiber coupler 4 are respectively connected with two optical fiber collimators 5 for optical signals, corresponding to the two fiber collimators 5 are provided with two mirrors 6, one of which can move back and forth. The sensor 3 of the long-period fiber grating pair is pre-buried in the monitored building as a curvature and temperature sensor, the broadband light source 1 and the signal demodulation part are both in the monitoring center, and the broadband light enters the sensor 3 of the long-period fiber ...

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Abstract

Through LPGP, light in broadband generates optical path difference caused by refringence between core layer and clad layer in optical fiber. The optical path difference is compensated by a scannable Michelson interferometer so as to obtain interference fringe. Intensity of interference fringe is sensitive to curvature of LPGP. Carrying out Fourier transform for interference fringe obtains centered wavelength of loss peak of macrocyclic optical fiber grating spectrograph in LPGP. The location of wavelength is sensitive to temperature signal. The invention obtains signal of dual parameters of LPGP sensor. Through matrix method, the invention eliminates crossing influence between parameters. Features are: low cost, suitable to integration and to instrument.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a dual-parameter measurement method of a long-period optical fiber grating pair sensor. Background technique [0002] In modern sensing, it is very common to measure two or more parameters simultaneously. South Korea’s Y.G.Han wrote two sections of Bragg gratings on optical fibers with different diameters. The spectral reflection peak positions of the two sections of gratings have the same sensitivity to temperature changes, but different sensitivity to strain. By monitoring the changes in the positions of the two reflection peaks, Simultaneously demodulate the temperature and strain signals. In the real-time monitoring system of building state, the sensor and its inquiry method that can measure temperature and strain (or bending) at the same time are very useful and have a broad market. [0003] In the field of optical fiber sensing, the Long-Period f...

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Application Information

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IPC IPC(8): G01D5/353G01K11/3206
Inventor 管祖光何赛灵
Owner ZHEJIANG UNIV
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