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High-speed demodulation device and method based on fiber fabry-perot cavity and fiber grating combined measurement

A fiber grating and demodulation device technology, which is applied to measurement devices, instruments, etc., can solve problems such as slow demodulation speed, and achieve the effects of fast demodulation speed, reduced demodulation cost, and accurate measurement results.

Active Publication Date: 2015-08-26
BEIHANG UNIV
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Problems solved by technology

[0005] Aiming at the problem of slow demodulation speed, the present invention provides a high-speed demodulation device and method based on dual-parameter joint measurement of optical fiber P-cavity and fiber Bragg grating

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  • High-speed demodulation device and method based on fiber fabry-perot cavity and fiber grating combined measurement
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  • High-speed demodulation device and method based on fiber fabry-perot cavity and fiber grating combined measurement

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Embodiment Construction

[0039] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0040]The invention senses changes in external temperature and pressure / strain, and simultaneously demodulates the cavity length variation of the optical fiber FRP cavity and the reflection center wavelength drift of the fiber grating, thereby realizing the measurement of the temperature, pressure / strain variation. The present invention integrates the three-wavelength digital phase demodulation method based on intensity demodulation and the edge filtering method into a set of demodulation schemes, respectively demodulates the fiber-optic cavity and the fiber grating, instead of using the spectral scanning method, This greatly improves the speed of demodulation. On the other hand, a calibration experiment was carried out before the measurement, which compensated the influence on the temperature measurement caused by the return interference spec...

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Abstract

The invention relates to a high-speed demodulation device and method based on fiber fabry-perot cavity and fiber grating combined measurement. The high-speed demodulation device comprises a power supply module, a 3dB coupler, a circulator, a sensing unit and a demodulation unit. The high-speed demodulation method comprises that the relation among the demodulation error amount, the temperature variation and the pressure / strain variation of a fiber grating is obtained via calibration, and relation among the length variation of a fiber fabry-perot cavity, the temperature variation and the pressure / strain variation is obtained via calibration; the length variation of the fiber fabry-perot cavity and the drift amount of the wavelength of a reflection center of the fiber grating are modulated; and the temperature variation and the pressure / strain variation are solved. Compared with the prior art, double parameters can be measured via rapid demodulation on the basis of fiber fabry-perot cavity and fiber grating sensing, influence of fiber fabry-perot interference spectrum on temperature measurement caused by fiber grating modulation is compensated, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a high-speed demodulation device and method based on dual-parameter joint measurement of an optical fiber peroxide cavity and an optical fiber grating. Background technique [0002] In recent years, dual-parameter (temperature, pressure / strain) simultaneous sensing technology based on optical fiber sensors is a very active research field. This type of sensing is mainly used in composite materials, large building structures, aerospace vehicles, military products, etc. Structural health self-diagnosis, environmental adaptation, damage self-healing, etc. [0003] As a sensor, the optical fiber F-P cavity obtains the change of the external physical quantity by demodulating the cavity length. It has the advantages of simple structure, small size, convenient installation, high reliability, high sensitivity, fast response, and single optical fiber signal transmission. It h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D21/02
Inventor 宋镜明金靖陈嬴邵洪峰吴蓉
Owner BEIHANG UNIV
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