Optical fiber sensing system based on phase-shifted optical fiber grating

A phase-shifting fiber grating and fiber sensing system technology, applied in the field of optical sensors, can solve the problems of difficult promotion and application, high system cost, and achieve the effects of increasing line width, ensuring optical power and saving costs.

Active Publication Date: 2012-12-19
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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Problems solved by technology

[0004] The wavelength demodulation method has been proposed in the prior art, however, the wavelength demodulation system of the prior art needs to b

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  • Optical fiber sensing system based on phase-shifted optical fiber grating
  • Optical fiber sensing system based on phase-shifted optical fiber grating

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[0021] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail in conjunction with specific embodiments and with reference to the accompanying drawings.

[0022] It should be noted that in the drawings or description of the specification, similar or identical parts use the same drawing numbers. And in the drawings, it is marked for simplicity or convenience. Furthermore, the implementation manners that are not shown or described in the drawings are those that are known to those of ordinary skill in the art. In addition, although this article may provide demonstrations of parameters including specific values, it should be understood that the parameters need not be exactly equal to the corresponding values, but can be approximated to the corresponding values ​​within acceptable error tolerances or design constraints.

[0023] Please refer to figure 1 , figure 1 It is a fibe...

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Abstract

The invention provides an optical fiber sensing system based on a phase-shifted optical fiber grating. The optical fiber sensing system comprises a semiconductor laser light source, a first coupler, the phase-shifted optical fiber grating, a fiber Bragg grating, a second coupler and a wavelength demodulation instrument, wherein the semiconductor laser light source generates a laser with preset wavelength width; the first coupler is used for coupling the laser with the preset wavelength width to the phase-shifted optical fiber grating and coupling a signal laser reflected back by the fiber Bragg grating to the second coupler; a transmission window of the phase-shifted optical fiber grating changes along with change of external physical quantity of the phase-shifted optical fiber grating, and transmitted portions of the laser passing through the phase-shifted optical fiber grating form the signal laser with wavelength narrower than the preset wavelength; the fiber Bragg grating is used for reflecting the signal laser, and the reflected signal laser is transmitted to the first coupler by the aid of the phase-shifted optical fiber grating; the second coupler is used for coupling the signal laser to the wavelength demodulation instrument; and the wavelength demodulation instrument is used for demodulating the signal laser to obtain the external physical quantity of the phase-shifted optical fiber grating. The optical fiber sensing system based on the phase-shifted optical fiber grating does not need a high-resolution spectrograph or a narrow-linewidth tunable laser, so that cost is greatly saved.

Description

technical field [0001] The invention relates to the technical field of optical sensors, in particular to an optical fiber sensing system based on a phase-shifting optical fiber grating. Background technique [0002] Fiber Bragg Grating (FBG for short) is made by utilizing the photosensitivity in the optical fiber, and the refractive index of the fiber core is periodically modulated to form a narrow-band (transmission or reflection) filter or mirror. When it is affected by physical quantities such as ambient temperature and pressure, its central wavelength will change, so fiber gratings can be used as sensors to measure changes in external physical quantities. Fiber Bragg grating sensing system has the advantages of anti-electromagnetic interference, corrosion resistance, stable chemical performance, small size, light weight, etc., and can be widely used in measuring temperature, pressure, strain, acceleration, etc., and has been widely used in large-scale structural building...

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Application Information

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IPC IPC(8): G01D5/26
Inventor 徐团伟李芳刘育梁
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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