Temperature- and pressure-dependent midinfrared absorption cross sections of gaseous hydrocarbons

Abstract

Transmittance spectra of four gaseous hydrocarbons were measured by using a Fourier transform infrared spectrometer. The analyzed substances are propane, n-butane, ethanol, and iso-octane (2,2,4-trimethyl-pentane). Mixtures of hydrocarbons and nitrogen were prepared and analyzed in an optical cell between 298 and 473 K at pressures up to 1800 kPa. Molecule specific absorption cross sections were calculated for different temperatures and pressures that are relevant for technical absorption measurements. Dependences of the spectral absorption cross sections, as well as the integrated absorption cross sections on temperature and pressure, were investigated.

Development of an alkali chloride vapour-generating apparatus for calibration of ultraviolet absorption measurements

“…Grosch et al 9 have developed a high-temperature open flow cell for reactive gases at temperatures up to 530 • C. This flow cell allows for highresolution spectroscopic measurements in the ultraviolet (UV) and infrared (IR) spectral regions (190-20 000 nm). Vattenfall Research and Development AB has developed and patented an in situ alkali chloride monitor (IACM) 7 based on UV absorption and designed a calibration cell 8 for this instrument.…”

Quantitative measurement of combustion gases in harsh environments using NDIR spectroscopy

“…Both are usually achieved by controlling and optimizing the combustion process, i.e. mixture formation prior to ignition (Grosch et al (2014), Bauke et al (2018), ). A typical approach to reduce NO x emissions is the use of exhaust gas recirculation to lower combustion temperature.…”

“…A typical approach to reduce NO x emissions is the use of exhaust gas recirculation to lower combustion temperature. EGR-rates can be determined by monitoring CO 2 concentrations (Grosch et al, 2014).…”

“…In contrast to sensors for civil applications requiring lowcost solutions, systems for engine development application are less price-sensitive but have, on the other hand, more demanding requirements. For example, they need to offer µs time resolution to enable crank-angle resolution and resolve single engine cycles (Grosch et al (2014), Bauke et al (2018)).…”

Quantitative, time-resolved detection of CH<sub>4</sub> concentrations in flows for injection analysis in CNG engines using IR absorption

“…In this work, we present the derivative of a measurement system based on NDIR absorption developed previously for mixture formation analysis at the spark plug in gasolinefuelled engines (Grosch et al, 2010(Grosch et al, , 2011(Grosch et al, , 2014(Grosch et al, , 2007. The system allows crank-angle resolved measurements of fuel concentration for single engine cycles.…”