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- Title
High performance direct absorption spectroscopy of pure and binary mixture hydrocarbon gases in the 6-11 $$\upmu$$ m range.
- Authors
Heinrich, Robert; Popescu, Alexandru; Hangauer, Andreas; Strzoda, Rainer; Höfling, Sven
- Abstract
The availability of accurate and fast hydrocarbon analyzers, capable of real-time operation while enabling feedback-loops, would lead to a paradigm change in the petro-chemical industry. Primarily gas chromatographs measure the composition of hydrocarbon process streams. Due to sophisticated gas sampling, these analyzers are limited in response time. As hydrocarbons absorb in the mid-infrared spectral range, the employment of fast spectroscopic systems is highly attractive due to significantly reduced maintenance costs and the capability to setup real-time process control. New developments in mid-infrared laser systems pave the way for the development of high-performance analyzers provided that accurate spectral models are available for multi-species detection. In order to overcome current deficiencies in the availability of spectroscopic data, we developed a laser-based setup covering the 6-11 $$\upmu$$ m wavelength range. The presented system is designated as laboratory reference system. Its spectral accuracy is at least $$6.6\times 10^{-3}$$ cm $$^{-1}$$ with a precision of $$3\times 10^{-3}$$ cm $$^{-1}$$ . With a 'per point' minimum detectable absorption of $$1.3\times 10^{-3}$$ cm $$^{-1}$$ Hz $$^{{-}{1/2}}$$ it allows us to perform systematic measurements of hydrocarbon spectra of the first 7 alkanes under conditions which are not tabulated in spectroscopic database. We exemplify the system performance with measured direct absorption spectra of methane, propane, iso-butane, and a mixture of methane and propane.
- Subjects
HYDROCARBONS; ABSORPTION spectra; BINARY mixtures; GAS chromatography; METHANE
- Publication
Applied Physics B: Lasers & Optics, 2017, Vol 123, Issue 8, p1
- ISSN
0946-2171
- Publication type
Article
- DOI
10.1007/s00340-017-6796-6