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Atmospheric pressure meter based on fiber bragg grating

A technology of atmospheric pressure and optical fiber grating, which is applied in the direction of fluid pressure measurement, fluid pressure measurement, and measurement devices using optical methods. It can solve problems such as low sensitivity and complex structure, and achieve high sensitivity, small size, and high resolution. Effect

Active Publication Date: 2012-09-19
山东双测安全信息技术产业研究院有限公司
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Problems solved by technology

However, its complex structure causes transverse strain on the fiber grating and low sensitivity, and there is no design of the overall sensing system and the realization of software and hardware from the perspective of engineering applications.

Method used

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  • Atmospheric pressure meter based on fiber bragg grating

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Embodiment Construction

[0020] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings, so as to better understand the present invention. It should be noted that in the following description, when detailed descriptions of known functions and designs may dilute the main content of the present invention, these descriptions will be omitted here.

[0021] Such as figure 1 As shown, the present invention includes: vacuum capsule 1, fiber Bragg grating (FBG) 2, tunable matched grating filter 3, ASE broadband light source 7, optical isolator 6, Y-type fiber coupler 5, photodetector 4, Signal amplification and processing system 8; wherein FBG 2 is fastened on the surface of vacuum bellows 1 by glue. Described ASE broadband light source 7, 3dB bandwidth 30nm; ASE broadband light source 7 is connected with the A port of Y-type fiber coupler 5 through optical isolator 6; The B port of Y-type fiber coupler 5 is connected with tunable fiber grating 3, ...

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Abstract

The invention provides an atmospheric pressure meter based on a fiber bragg grating, which comprises a vacuum membrane box, a fiber bragg grating, a tunable matching grating filter, a wideband light source, a light isolator, a Y-type fiber coupler, a photoelectric detector and a signal amplifying and processing system, wherein the fiber bragg grating is fastened on the surface of the vacuum membrane box through glue. In the invention, the information of wavelength drift is demodulated by using a matching grating demodulating method, therefore, the strain of the fiber bragg grating, namely the deformation degree of the vacuum membrane box, is solved, and finally, the atmospheric pressure value is obtained. Light wavelength is detected but the light power is not detected, and light wavelength information is not influenced by light power loss in a light transmission process, therefore, the atmospheric pressure meter has the advantages of higher detection precision, larger resolving property and smaller noise. The atmospheric pressure meter is high in sensitivity and strong in strain resolving property. Meanwhile, an optical fiber sensor has stronger capacities of resisting electromagnetic interference, vibration, dampness, corrosion and the like, so that the atmospheric pressure meter can be normally used in a serious environment for a long time.

Description

technical field [0001] The invention relates to an atmospheric pressure gauge based on an optical fiber grating, and belongs to the technical field of optical fiber sensing. Background technique [0002] Sensor technology is one of the important technologies of modern measurement and automation systems. Barometric pressure is an important parameter in aerospace, and barometers can be used to calibrate many other navigational instruments. Traditional barometers can no longer fully meet the requirements of flameproof, explosion-proof and electromagnetic interference-proof instruments in aerospace. It is urgent to develop a small-sized barometer with strong anti-interference ability. [0003] Fiber Bragg Grating is a new type of optoelectronic device developed in the 1990s. After more than 10 years of development, the production technology of Fiber Bragg Grating is becoming more and more mature, and the system application is constantly expanding. Since the sensitive variable ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L11/02G01L19/04
Inventor 魏鹏王钊周亚光李成贵
Owner 山东双测安全信息技术产业研究院有限公司
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