Intensity demodulation type wind speed sensor based on chirped fiber grating

A chirped fiber grating, wind speed sensor technology, applied in the direction of velocity/acceleration/shock measurement, instrument, fluid velocity measurement, etc. Indestructible effect

Active Publication Date: 2022-06-28
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The broadband laser output by the broadband light source is limited to a specific wavelength by the filter and then input into the sensing unit. When the wind blows to the sensing unit, the sensing unit bends, causing the chirped long-period fiber grating embedded in it to deform. , the chirp signal is therefore weakened, and the light intensity of the transmission spectrum also changes accordingly. The change of the light intensity of the transmission spectrum of the chirped light signal is analyzed by a spectrometer, and then the ambient wind pressure is detected. However, this long-period fiber grating wind speed sensor has a large volume, Not conducive to promotion

Method used

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  • Intensity demodulation type wind speed sensor based on chirped fiber grating
  • Intensity demodulation type wind speed sensor based on chirped fiber grating
  • Intensity demodulation type wind speed sensor based on chirped fiber grating

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Experimental program
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Embodiment 1

[0052] For ease of understanding, see figure 1 , figure 2 , an embodiment of the intensity demodulation type wind speed sensor based on chirped fiber grating provided by the present invention includes a broadband light source 1, a Y-type fiber circulator 2, a pump laser 3, a wavelength division multiplexer 4, a pump light coupling device 5, chirped fiber grating 6 and optical power meter 7 coated with metal thin film 8 on the surface; wherein:

[0053] The broadband light source 1 is connected to the first port of the Y-type optical fiber circulator 2, and is used to emit output light to the Y-type optical fiber circulator 2;

[0054] The second port of the Y-type optical fiber circulator 2 is connected to the signal optical port of a specific wavelength of the wavelength division multiplexer 4, and the Y-type optical fiber circulator 2 is used for directional transmission of output light;

[0055] The pump laser 3 is connected to a pump light port of a specific wavelength ...

Embodiment 2

[0082] like image 3 As shown, the intensity demodulation type wind speed sensor based on chirped fiber grating measures wind speed, including the following steps:

[0083] S1: The output light of the broadband light source 1 is input from the first port of the Y-type optical fiber circulator 2, output from the second port of the Y-type optical fiber circulator 2, and reaches the signal optical port of the specific wavelength of the wavelength division multiplexer 4;

[0084] S2: The wavelength division multiplexer 4 combines the output light of the broadband light source and the pump light emitted by the pump laser 3 into a beam to obtain a combined beam. The combined beam is output from the common port of the wavelength division multiplexer 4 and reaches the pump optocoupler 5;

[0085] S3: The pump optical coupler 5 couples the pump light of the combined light into the fiber cladding of the chirped fiber grating 6, and the metal film 8 coated on the surface of the chirped ...

Embodiment 3

[0092]Intensity demodulation type wind speed sensor based on chirped fiber grating, the process of measuring wind speed by optical power meter 7 is as follows: the output light of broadband light source 1 reaches wavelength division multiplexer 4 through Y-type fiber circulator 2, and the output light of broadband light source 1 reaches wavelength division multiplexer 4, and the output light of broadband light source 1 reaches wavelength division multiplexer 4 through Y-type fiber circulator 2. The pump light is transmitted to the pump optical coupler 5 through the wavelength division multiplexer 4 together. The pump optical coupler 5 couples the pump light into the fiber cladding, and is then absorbed by the metal film 8 coated on the surface of the chirped fiber grating 6 to generate heat, so that the temperature of the chirped fiber grating 6 increases, and the reflection spectrum bandwidth widen. Due to the long length of the chirped fiber grating 6, the intensity of the p...

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Abstract

The invention discloses an intensity demodulation type wind speed sensor based on a chirped fiber grating. The intensity demodulation type wind speed sensor comprises a broadband light source, a Y-shaped optical fiber circulator, a pump laser, a wavelength division multiplexer, a pump optical coupler, the chirped fiber grating with the surface coated with a metal film and an optical power meter. Heat is generated through the absorption effect of the metal film coated on the surface of the chirped fiber grating on the pump light, the chirped fiber grating is heated, and due to the temperature gradient change caused by attenuation of the power of the pump light along the length of the chirped fiber grating, the reflection spectrum bandwidth of the chirped fiber grating is widened. Under the action of wind speed, the heating effect of the metal film is weakened, the reflection spectrum bandwidth and the reflection light power of the chirped fiber grating are reduced, and the change of the reflection light power of the chirped fiber grating is measured by using the optical power meter, so that the wind speed is measured, and the device has the characteristics of high measurement speed, low cost of a demodulation system, small size, convenience in use and the like. The fiber grating wind speed sensor is suitable for dynamic high-speed measurement, and the dynamic detection range of the fiber grating wind speed sensor is widened.

Description

technical field [0001] The invention relates to the technical field of fiber grating sensors, in particular to an intensity demodulation type wind speed sensor based on chirped fiber gratings. Background technique [0002] With the acceleration of industrial modernization, the accurate measurement of airflow speed plays an important role in aviation, chemical industry, medical treatment, agriculture and other fields. Wind speed sensors based on various principles have been proposed one after another. At present, in some harsh environments such as low temperature or high temperature, radioactivity and corrosiveness, the wind speed sensor of the micro-electromechanical system cannot work or the measurement effect is not good. [0003] Fiber optic wind speed sensors have attracted extensive attention due to their advantages of anti-electromagnetic interference, long-distance measurement capability, high sensitivity, and high adaptability to harsh environments. [0004] Among t...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G01P5/26
CPCG01P5/26Y02A90/10
Inventor董新永唐玉涵徐鹏柏高震森杨军王云才秦玉文
OwnerGUANGDONG UNIV OF TECH