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Research On HHT Algorithm In EFPI Optical Fiber Gas Monitoring System

Posted on:2016-08-02Degree:MasterType:Thesis
Country:ChinaCandidate:X XieFull Text:PDF
GTID:2181330467491019Subject:Electrical engineering
Abstract/Summary:PDF Full Text Request
With the rapid development of economy in our country, and the constant improvement of the coal mining technology, mining area of the mining depth gradually deepened, lead to the increasing of gas disaster in coal mine, safety hidden danger also more and more. Design a good detection effect, meet the coal mine safety in production of gas concentration measurement system, to reduce the gas explosion accidents, to ensure the safety of underground operations. Traditional non-optical gas sensors have slow response, short life, detection accuracy and low defects, and it is difficult to achieve continuous real-time detection of a larger area. Using an optical method for detecting methane gas has been an effective way to detect a widely recognized, various fiber sensors become everyone’s first choice in the coal mine gas safety testing, and also in coal production has played a huge role. Solve the problem of coal mine safety accidents fundamentally, to achieve long-term development of the coal mines.This paper constructs kind of EFPI optical fiber gas monitoring system based on HHT algorithm, to realize the measurement of the gas. First, it introduces the principles and demodulation method of EFPI fiber optic sensing technology, and then introduces the basic theory, structure and application of HHT algorithm. Then gives the overall structure of the gas monitoring system, using the laser of MXSLD-CS65M5A, improved EFPI sensors, gas chamber and other devices. They are introduced respectively. The structure of hardware is designed, with STM32F103VE as the core, The system uses μc/os-Ⅱ as the operating system. Finally, build laboratory platform and analog demodulation by MATLAB simulation. Use HHT algorithm to extract information from the spectral interference EFPI, get EFPI spectral information filtered and demodulated using bimodal algorithm EFPI cavity length information.Through simulation and numerical analysis, the algorithm to solve the original non-stationary signal interference spectrum, nonlinear shortcomings, through a series of changes to remove noise, which can reduce the difficulty of data processing and increase the accuracy of the gas signal analysis. Through the study of optical fiber sensing gas, and implement new methods of coal mine gas monitoring and for guiding coal mine production safety is of great significance.
Keywords/Search Tags:Gas, optical fiber sensor, EFPI, HHT, Spectrum detection
PDF Full Text Request
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