Multiplexing demodulation equipment based on long-cycle fiber grating reflective sensor

A reflective sensor and fiber grating technology, which is applied in the direction of converting sensor output, using optical devices to transmit sensing components, instruments, etc., can solve the problems of backward time division multiplexing systems and wavelength division multiplexing systems in applied research, and achieve low cost , Realize the effect of multiplexing and a large number of multiplexing

Inactive Publication Date: 2016-07-27
DONGHUA UNIV
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  • Description
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Problems solved by technology

The multiplexing demodulation system based on the principle of low coherence is a multiplexing system with excellent performance and low cost, but the application research of this system is still far behind the time division multiplexing system, wavelength division multiplexing system, etc.

Method used

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  • Multiplexing demodulation equipment based on long-cycle fiber grating reflective sensor
  • Multiplexing demodulation equipment based on long-cycle fiber grating reflective sensor

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Embodiment Construction

[0015] 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 teachings of the present invention, those skilled in the art can 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.

[0016] Such as figure 1 As shown, the broadband light source 1 is connected with the optical signal of the first port of the three-port circulator 2, and the long-period fiber grating reflective sensor 4 is connected in series to the same optical fiber through a fiber coupler 3, and n (n≥2) The optical fibers of different optical path difference sensors are optically connected to the second port of the circulator, and the thir...

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Abstract

The invention relates to multiplexing demodulation equipment based on long-cycle fiber grating reflective sensors.The multiple long-cycle fiber grating reflective sensors are provided with different optical path differences; a broadband light source is connected with the first port of a three-port circulator, the second port of the three-port circulator is connected with an optical fiber connected with the multiple long-cycle fiber grating reflective sensors in series, and the third port is connected with the input end of a first optical fiber coupler; an output end of the first optical fiber coupler is connected with the input end of a polarization controller, and the other output end of the first optical fiber coupler is connected with the input end of an electric adjustable delay line; the output end of the polarization controller and the output end of the electric adjustable delay line are connected with two input ends of a second optical fiber coupler; the output end of the second optical fiber coupler is connected with the input end of a photoelectric detector, and the output end of the photoelectric detector is connected with a data acquisition card.By means of the multiplexing demodulation equipment, system spatial resolution is high, the reusable number is large, and cost is low.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a multiplexing demodulation device based on long-period optical fiber grating reflective sensors. Background technique [0002] In the field of optical fiber sensing, long-period fiber gratings have become a very important sensing device due to their high sensitivity to changes in temperature, stress and strain, and environmental refractive index. Compared with Bragg gratings, long-period fiber gratings have higher sensitivity to temperature, stress, etc., and its cladding mode is sensitive to the refractive index of the external environment, which can be applied to high-precision measurement of the refractive index of liquids. Although it has excellent single-point sensing performance, the practical progress of long-period fiber gratings in the application field lags far behind Bragg gratings. Due to its narrow frequency-domain reflection bandwidth, generally less...

Claims

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Application Information

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IPC IPC(8): G01D5/353
CPCG01D5/35354
Inventor 姜萌赵中泽王则鸣
Owner DONGHUA UNIV
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