Optically multiplexed multi-gas detection using quantum cascade laser photoacoustic spectroscopy.
We report high-throughput, nondispersive optical multiplexing of laser beams using a scanning galvanometer. We have utilized this technique for multispecies trace-gas detection using multiple quantum cascade laser photoacoustic spectroscopy. We demonstrate switching from one laser to another in less than 1 s, a performance level needed for a comprehensive multispecies sensor, and a high signal-to-noise ratio detection of five gaseous components, NH(3), NO(2), dimethyl methyl phosphonate (DMMP, a simulant for nerve agents), acetone, and ethylene glycol, in a room air gas mixture containing approximately 3 ppb of NH(3), approximately 8 ppb of NO(2), approximately 20 ppb of DMMP, approximately 30 ppb of acetone, and approximately 40 ppb of ethylene glycol.
Mukherjee
Anadi
A
Pranalytica, Inc., 1101 Colorado Avenue, Santa Monica, California 90401, USA.
Prasanna
Manu
M
Lane
Michael
M
Go
Rowel
R
Dunayevskiy
Ilya
I
Tsekoun
Alexei
A
Patel
C Kumar N
CK