Quantitative Acoustic Relaxational Spectroscopy for real-time monitoring of natural gas: A perspective on its potential

Andi Petculescu*, Richard M. Lueptow

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

42 Scopus citations

Abstract

Although there are several methods for high sensitivity gas composition detection, typically off-line and laboratory-based, approaches for real-time, moderate-sensitivity detection are few. An approach based on Quantitative Acoustic Relaxation Spectroscopy (QARS) is proposed here. The methodology is based on the frequency-dependent acoustic propagation in a gas mixture, which depends on the concentration of contaminant gases in a known base gas. After describing the molecular acoustics model and QARS algorithm, we provide examples related to the identification of "mine gas" contamination in air, a mining safety application, and detecting impurities in low quality natural gas, an important issue in the natural gas processing industry. In both of these cases where moderate-sensitivity, continuous gas composition sensing would be useful, the QARS approach shows significant promise, at least theoretically, for realistic contaminant levels. Of course, further work is needed to refine several aspects of the molecular relaxation model that is necessary for the approach to be successful, not to mention challenges related to the development of a sensor based on the technique. Nevertheless, QARS holds potential to be a simple, robust, and inexpensive approach for moderate-sensitivity, continuous, real-time gas composition sensing.

Original languageEnglish (US)
Pages (from-to)121-127
Number of pages7
JournalSensors and Actuators, B: Chemical
Volume169
DOIs
StatePublished - Jul 5 2012

Keywords

  • Acoustic sensors
  • Molecular relaxation
  • Natural gas
  • Quantitative gas analysis

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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