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Proceedings Paper

Flow immune photoacoustic sensor for real-time and fast sampling of trace gases
Author(s): Jan C. Petersen; David Balslev-Harder; Nikola Pelevic; Anders Brusch; Stefan Persijn; Mikael Lassen
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Paper Abstract

A photoacoustic (PA) sensor for fast and real-time gas sensing is demonstrated. The PA cell has been designed for flow noise immunity using computational fluid dynamics (CFD) analysis. PA measurements were conducted at different flow rates by exciting molecular C-H stretch vibrational bands of hexane (C6H14) in clean air at 2950cm-1 (3.38 μm) with a custom made mid-infrared interband cascade laser (ICL). The PA sensor will contribute to solve a major problem in a number of industries using compressed air by the detection of oil contaminants in high purity compressed air. We observe a (1σ, standard deviation) sensitivity of 0.4 ±0.1 ppb (nmol/mol) for hexane in clean air at flow rates up to 2 L/min, corresponding to a normalized noise equivalent absorption (NNEA) coefficient of 2.5×10-9 W cm-1 Hz1/2, thus demonstrating high sensitivity and fast and real-time gas analysis. The PA sensor is not limited to molecules with C-H stretching modes, but can be tailored to measure any trace gas by simply changing the excitation wavelength (i.e. the laser source) making it useful for many different applications where fast and sensitive trace gas measurements are needed.

Paper Details

Date Published: 22 February 2018
PDF: 8 pages
Proc. SPIE 10539, Photonic Instrumentation Engineering V, 105390G (22 February 2018); doi: 10.1117/12.2291064
Show Author Affiliations
Jan C. Petersen, Danish Fundamental Metrology Institut (Denmark)
David Balslev-Harder, Danish Fundamental Metrology Institut (Denmark)
Nikola Pelevic, VSL Dutch Metrology Institute (Netherlands)
Anders Brusch, Danish Fundamental Metrology Institut (Denmark)
Stefan Persijn, VSL Dutch Metrology Institute (Netherlands)
Mikael Lassen, Danish Fundamental Metrology Institut (Denmark)

Published in SPIE Proceedings Vol. 10539:
Photonic Instrumentation Engineering V
Yakov G. Soskind, Editor(s)

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