基于静态干涉系统的井下甲烷浓度实时监测系统的研究
发布时间：2018-07-20 13:46
【摘要】：为了保证井下工作安全,设计了一种CH4实时在线监测系统。在分析了CH4气体特征吸收光谱的基础上,系统采用静态傅里叶变换干涉具及柱面镜等组成。通过线阵CCD采集静态干涉条纹,由光谱分析算法求出各个波长上的光强衰减度,最后通过比尔-朗伯定理、浓度程长积公式等反演CH4气体的浓度。仿真计算了光源光强、出射光强与瓦斯浓度的函数关系,验证了采用5 m W的DFB激光器,可以保证变化区域基本线性。系统采用分子筛过滤处理的方法,克服了目前光谱检测系统无法在井下复杂环境应用的难题。实验显示,在5 cm的气室中,经分子筛过滤保护的光谱探测系统可以在潮湿、粉尘的环境中稳定工作。采用傅里叶变换光谱分析法求解CH4浓度时,最小探测精度可达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.
【作者单位】： 焦作大学机电工程学院;
【基金】：国家自然科学基金(10974104) 河南省自然科学基金研究项目(132300410267)资助
【分类号】：TD712.3
，
本文编号：2133743
[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.
【作者单位】： 焦作大学机电工程学院;
【基金】：国家自然科学基金(10974104) 河南省自然科学基金研究项目(132300410267)资助
【分类号】：TD712.3
，
本文编号：2133743
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