【摘要】：為了保證井下工作安全,設(shè)計了一種CH4實時在線監(jiān)測系統(tǒng)。在分析了CH4氣體特征吸收光譜的基礎(chǔ)上,系統(tǒng)采用靜態(tài)傅里葉變換干涉具及柱面鏡等組成。通過線陣CCD采集靜態(tài)干涉條紋,由光譜分析算法求出各個波長上的光強衰減度,最后通過比爾-朗伯定理、濃度程長積公式等反演CH4氣體的濃度。仿真計算了光源光強、出射光強與瓦斯?jié)舛鹊暮瘮?shù)關(guān)系,驗證了采用5 m W的DFB激光器,可以保證變化區(qū)域基本線性。系統(tǒng)采用分子篩過濾處理的方法,克服了目前光譜檢測系統(tǒng)無法在井下復(fù)雜環(huán)境應(yīng)用的難題。實驗顯示,在5 cm的氣室中,經(jīng)分子篩過濾保護的光譜探測系統(tǒng)可以在潮濕、粉塵的環(huán)境中穩(wěn)定工作。采用傅里葉變換光譜分析法求解CH4濃度時,最小探測精度可達0.01%。
[Abstract]:In order to ensure the safety of underground work, a real-time on-line CH4 monitoring system is designed. Based on the analysis of the characteristic absorption spectra of Ch _ 4 gas, the system is composed of static Fourier transform interferometer and cylindrical mirror. The static interference fringes are collected by linear CCD, and the attenuation degree of light intensity at various wavelengths is calculated by spectral analysis algorithm. Finally, the concentration of Ch _ 4 gas is inversed by the Bear-Lambert theorem and the formula of concentration long product. The function relationship between the light intensity of the light source, the output light intensity and the gas concentration is simulated and calculated. It is verified that the DFB laser with 5 MW can guarantee the basic linearity of the variation region. The system adopts the method of molecular sieve filtration to overcome the problem that the spectral detection system can not be used in the complex underground environment. The experimental results show that the spectral detection system protected by molecular sieve filter can work stably in moist and dusty environment in a 5 cm chamber. The minimum detection accuracy can reach 0.01 when the concentration of Ch _ 4 is calculated by Fourier transform spectrum method.
【作者單位】： 焦作大學(xué)機電工程學(xué)院;
【基金】：國家自然科學(xué)基金(10974104) 河南省自然科學(xué)基金研究項目(132300410267)資助
【分類號】：TD712.3
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本文編號：2133743