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1. 发明授权

US4383181A Method and apparatus for analyzing a gaseous mixture 失效
标题翻译：用于分析气体混合物的方法和装置
公开(公告)号：US4383181A
公开(公告)日：1983-05-10
申请号：US212660
申请日：1980-12-03
申请人： Dieter Roess , Wolfgang Hartig
发明人： Dieter Roess , Wolfgang Hartig
IPC分类号： G01N21/31 , G01N15/06
CPC分类号： G01N21/314
摘要： A gaseous mixture containing a number of molecular gases is analyzed to establish the amount of each individual gas by directing a light beam along a measurement path 11 through the gas. Each of the spectral component is selected to coincide with a respective vibrational-rotational-excitation band of one of the gases. The attenuation produced in each of the spectral components in its passage along the measurement path 11 serves as an indication of the concentration of the associated gas. The spectral components are generated either from distinct light sources 12, 13, 14 or are alternatively produced by spectral division of light from a multiple line or broad band source. Different marking frequencies f1, f2 and f3 are used to modulate each of the spectral components so that the signal received from the single photoelectric receiver 18 can be subsequently demodulated by three demodulators 19, 20, 21 to recover information relating to the individual spectral components. A series of reference beams at spectral frequencies which are unattenuated by the gases present in the measurement section are used for comparison purposes and allow factors such as contamination of the optics and ageing of the light source to be taken into account. A number of different embodiments are disclosed showing various ways of generating the spectral measurement and reference components and of processing the signals delivered by the single photoelectric receiver 18.
摘要翻译：分析含有多个分子气体的气体混合物，以通过沿着测量路径11引导光束通过气体来建立每个单独气体的量。选择每个频谱分量以与气体中的一种的相应振动旋转激发频带一致。在其沿着测量路径11的通道中的每个光谱分量中产生的衰减用作关联气体的浓度的指示。光谱分量由不同的光源12,13,14产生，或者通过来自多条线或宽带光源的光的光谱分割而产生。使用不同的标记频率f1，f2和f3来调制每个频谱分量，使得从单个光电接收机18接收的信号可以随后由三个解调器19,20,21进行解调，以恢复与各个频谱分量有关的信息。使用在测量部分中存在的气体没有衰减的光谱频率的一系列参考光束用于比较目的，并且可以考虑诸如光学元件的污染和光源老化等因素。公开了许多不同的实施例，其显示了生成频谱测量和参考分量以及处理由单个光电接收器18传送的信号的各种方式。

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