近红外光谱烷烃类气体定量分析系统的研究  

A Method for Quantitative Analysis System of Alkane Gaseous Mixture with Near Infrared Spectroscopy

作　　者：朱凌建[1,2] 汤晓君[1] 邱宗明[2] 刘君华[1] 张钟华[3] 张勇[1] 

机构地区：[1]西安交通大学电力设备电气绝缘国家重点实验室,陕西西安710049 [2]西安理工大学机械与精密仪器工程学院,陕西西安710048 [3]中国计量科学研究院,北京100013

出　　处：《光谱学与光谱分析》2011年第1期69-72,共4页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(50877056);陕西省教育厅自然科学研究项目(09JK684)资助

摘　　要：介绍了一种近红外光谱烷烃类气体在线定量分析测量方法。该方法以单片闪耀光栅为核心构成分光系统,分析计算了分光系统的关键参数,设计构建了硬件系统平台,完成了窄带光束实验测试和烷烃类七种单组分气体光谱探测实验。实验表明,入射狭缝为2mm时,分光系统在中心波长1200～1800nm波段内能够分离谱宽为10nm的窄带光束,出射光束中心波长步进扫描步长优于0.1nm。光谱探测实验证实七种气体在1600～1800nm波段内存在较强的特征谱线,但存在严重的交叉混叠现象。甲烷谱线位置与HITRAN光谱数据库相吻合。实验结果表明该方法有可能用于混合气体探测,且结构简单、成本低廉,为后续研究提供了技术储备并明确了研究方向。A method for online quantitative analysis system of alkane gaseous mixture with near infrared spectroscopy is described in the present paper.A single plane diffraction grating is used as the principal device in the monochromatic spectrum system.The key parameters of the monochromator were deduced and calculated in detail.A quantitative analysis system was designed and constructed according to the parameters.The narrow-band beam testing experiments and spectral scanning experiments of seven kinds of single-component alkane gases were accomplished on the above hardware system platform.The narrow-beam experiments show that a 10 nm narrow-band beam spectra was successfully obtained by the monochromatic system when the entrance slit width is 2 mm.And a step-scanning resolution of the outgoing beam＇s center wavelength with 0.1 nm can be realized within the spectra of 1.2~1.8 μm.The spectral scanning experiments indicate that there was some stronger characteristic absorption spectrum existing between the spectra of 1.6~1.8 μm,which is consistent with the HITRAN spectral database.And there is serious cross-aliasing phenomenon existing among the absorption spectra.These experiments demonstrate that this method has a successful application in mixed gas monitoring and on-line analysis with the characteristics of simple structure and low cost.And it also provides further technical reserves and opens a path way to spectral analysis in the follow-up studies.

关 键 词：近红外吸收光谱 烷烃类气体 定量分析 平面衍射光栅 

分 类 号：TH744.4[机械工程—光学工程]