Optical fiber hot-wire type wind gage based on tilted fiber bragg grating

A fiber-optic Bragg and hot-wire technology, which is applied in the direction of measuring fluid velocity by using thermal variables, can solve the problems of low sensitivity and repeatability, complex structure, etc., and achieve the effect of simple measurement principle, small size and convenient production

Inactive Publication Date: 2013-03-20
CHINA JILIANG UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to propose a tilted fiber Bragg grating-based anemometer with simple design, compact structure, high sensitivity and low cost, aiming at the shortcomings of existing fiber Bragg grating anemometers, such as complex structure, low sensitivity and low repeatability. Fiber Optic Hot Wire Anemometer

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  • Optical fiber hot-wire type wind gage based on tilted fiber bragg grating
  • Optical fiber hot-wire type wind gage based on tilted fiber bragg grating

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Embodiment Construction

[0013] The present invention will be further described below in conjunction with the accompanying drawings.

[0014] Such as figure 1 , shown in 2, a kind of fiber optic hot wire wind power based on tilted fiber Bragg grating, mainly includes spectrometer 1, broadband light source 2, fiber optic circulator 3, pumping light source 4, wavelength division multiplexer 5, tilted fiber Bragg grating 6, Metal film7. The spectrometer 1 is connected to the optical output end of the optical fiber circulator 3, the incident end of the optical fiber circulator 3 is connected to the broadband light source 1, and at the same time, the reflection end of the optical fiber circulator 3 is connected to the Pass end of the peak multiplexer 5, and the peak multiplexer The Reflect end of 5 is connected to the pump light source, and the Common end of the peak multiplexer is connected to one end of the inclined fiber grating 6 coated with a metal film.

[0015] In order to couple the pump light so...

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Abstract

The invention relates to an optical fiber hot-wire type wind gage based on a tilted fiber bragg grating which uses wavelength demodulation method to achieve wind power measurement and solves problems that an ordinary optical fiber sensor is complex in structure and high in cost. The optical fiber hot-wire type wind gage based on a tilted fiber bragg grating is capable of enabling pump light source to enter a wind gage through a wavelength division multiplexer, being coupled into a cladding of a cladding mode of the tilted fiber bragg grating, heating a metallic film plated on the surface, raising temperature of the optical fiber to cause redshift of wavelength of the tilted fiber bragg grating, lowering the temperature of the optical fiber by wind to cause blueshift of wavelength of the tilted fiber bragg grating, and obtaining information related to the wind power through wavelength measurement by broadband light source and a spectrometer. The optical fiber hot-wire type wind gage based on the tilted fiber bragg grating is small in size, simple in structure, low in cost, strong in operability, and capable of being widely used in various wind monitoring fields.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to an optical fiber hot-wire anemometer based on an inclined optical fiber Bragg grating. Background technique [0002] Compared with traditional anemometers, fiber optic hot wire anemometers have unique advantages: high sensitivity, light weight, small size, anti-electromagnetic interference, corrosion resistance, and intrinsically safe. Since the optical fiber hot-wire anemometer uses light waves to transmit information, and the optical fiber can be used as an electrical insulation and corrosion-resistant transmission medium, it can be conveniently and effectively used in various large electromechanical, seismic wave detection, petrochemical, mine and other strong electromagnetic fields. Interference and flammable and explosive and other harsh environments. [0003] There are many mechanisms for using optical fiber as a hot-wire anemometer medium, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P5/10
Inventor 董新永郑杰
Owner CHINA JILIANG UNIV
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