Abstract
Two compact TDLAS sensor systems based on different structural optical cores were developed. The two optical cores combine two recent developments, gallium antimonide (GaSb)-based ICL and a compact multipass gas cell (MPGC) with the goal to create compact TDLAS based sensors for the mid-IR gas detection with high detection sensitivity and low power consumption. The sensors achieved minimum detection limits of ~5 ppbv and ~8 ppbv, respectively, for CH4 and C2H6 concentration measurements with a 3.7-W power consumption.
Highlights
Numerous diverse applications of trace gas sensing includes environmental monitoring, industrial process control and the monitoring of gas concentrations at industrial locations, or exhaled breath for medical diagnostics
Two compact Tunable diode laser absorption spectroscopy (TDLAS) sensor systems based on different structural optical cores were developed
A future sensor upgrade will employ an ARM microprocessor-based controller, instead of the laptop with NI DAQ card, which will have a significantly smaller size, lower power consumption and longer battery life
Summary
Numerous diverse applications of trace gas sensing includes environmental monitoring, industrial process control and the monitoring of gas concentrations at industrial locations, or exhaled breath for medical diagnostics. The commercial availability of ICLs in 2009 led to new opportunities for TDLAS based sensing applications, especially the detection of hydrocarbons [9,10,11,12,13,14]. Hydrocarbons, such as methane (CH4), ethane (C2H6), propane (C3H8), ethylene (C2H4), propene (C3H6), acetylene (C2H2), have strong absorption features in the 3-4 μm spectral range where their fundamental absorption band is located. The detection of ethane is of interest for environmental monitoring [20,21]
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