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Monitoring the Wobbe index of natural gas using fiber-enhanced raman spectroscopy

: Sandfort, Vincenz; Trabold, Barbara M.; Abdolvand, Amir; Bolwien, Carsten; Russell, Philip S.J.; Wöllenstein, Jürgen; Palzer, Stefan

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Sensors. Online journal 17 (2017), Nr.12, Art. 2714, 17 S.
ISSN: 1424-8220
ISSN: 1424-8239
ISSN: 1424-3210
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IPM ()
raman spectroscopy; Wobbe Index; photonic crystal fiber; Kagomé; natural gas

The fast and reliable analysis of the natural gas composition requires the simultaneous quantification of numerous gaseous components. To this end, fiber-enhanced Raman spectroscopy is a powerful tool to detect most components in a single measurement using a single laser source. However, practical issues such as detection limit, gas exchange time and background Raman signals from the fiber material still pose obstacles to utilizing the scheme in real-world settings. This paper compares the performance of two types of hollow-core photonic crystal fiber (PCF), namely photonic bandgap PCF and kagomé-style PCF, and assesses their potential for online determination of the Wobbe index. In contrast to bandgap PCF, kagomé-PCF allows for reliable detection of Raman-scattered photons even below 1200 cm−1, which in turn enables fast and comprehensive assessment of the natural gas quality of arbitrary mixtures.