TY - JOUR
AU - Emmenegger, Lukas
AB - Instrumentation for environmental monitoring of gaseous pollutants and greenhouse gases tends to be complex, expensive, and energy demanding, because every compound measured relies on a specific analytical technique. This work demonstrates an alternative approach based on mid-infrared laser absorption spectroscopy with dual-wavelength quantum cascade lasers (QCLs). The combination of two dual- and one single-DFB QCL yields high-precision measurements of CO (0.08 ppb), CO2 (100 ppb), NH3 (0.02 ppb), NO (0.4 ppb), NO2 (0.1 ppb), N2O (0.045 ppb), and O3 (0.11 ppb) simultaneously in a compact setup (45 × 45 cm2). The lasers are driven time-multiplexed in intermittent continuous wave mode with a repetition rate of 1 kHz. The individual spectra are real-time averaged (1 s) by an FPGA-based data acquisition system. The instrument was assessed for environmental monitoring and benchmarked with reference instrumentation to demonstrate its potential for compact multi-species trace gas sensing.
TI - Multi-species trace gas sensing with dual-wavelength QCLs
JF - Applied Physics B
DO - 10.1007/s00340-018-6977-y
DA - 2018-05-17
UR - https://www.deepdyve.com/lp/springer-journals/multi-species-trace-gas-sensing-with-dual-wavelength-qcls-MDkllIaG8V
SP - 1
EP - 9
VL - 124
IS - 6
DP - DeepDyve
ER -