Laser gas analysis for multicomponent gas mixtures with essentially different gas concentration

Analysis and Approximation of Multicomponent Gas Mixtures

We consider a generalized system of Euler equations that describes the inviscid ow of a mixture of diierent gases. Systems of conservation laws of this type occur typically in the context of the numerical simulation of reacting gas ows. Results concerning the mathematical properties of the above model are presented. It turns out that a simple property of the thermodynamical equation of state en...

Multicomponent gas analysis using broadband quantum cascade laser spectroscopy.

We present a broadband quantum cascade laser-based spectroscopic system covering the region between 850 and 1250 cm(-1). Its robust multipass cavity ensures a constant interaction length over the entire spectral region. The device enables the detection and identification of numerous molecules present in a complex gas mixture without any pre-treatment in two minutes. We demonstrate that we can d...

Manometric Analysis of Gas Mixtures

Compact laser difference-frequency spectrometer for multicomponent trace gas detection

Design, performance characteristics, and application of a room temperature mid-infrared laser spectrometer are reported. This compact instrument is based on differencefrequency mixing of a widely tunable external-cavity diode laser and a diode-pumped monolithic Nd:YAG ring laser in periodically poled lithium niobate (PPLN). The differencefrequency tuning range of 3.98 μm to 4.62 μm was sufficie...

PDAE Formulations of Gas Pipes with Gas Mixtures

A PDAE model of a multicomponent gas pipeline has been formulated and solved using the ode15s solver of Matlab. The model with boundary conditions allows for reactions and di usion. Also, general cubic equations of state for pressure and enthalpy are described. To simplify the implementation at this stage, a non-reactive, non-di usional model with fixed feed composition is considered, and multi...