LPAS
Principle of the Measurement:
1. Excitation of ethylene inside a resonator using a modulated CO2 laser
2. Quenching of excited ethylene by collisions
3. Heat transfer leads to audible noise at the laser modulation frequency
4. Detection of noise with a microphone
Species Measured:
1. Ethylene
Time response:
4-20 seconds
Detection limit:
70-200 pptv
Manufacturer:
Sensor Sense
Publications:
Airborne measurements of ethene from industrial sources using laser photo-acoustic spectroscopy
J.A. de Gouw, S. te Lintel Hekkert, J. Mellqvist, C. Warneke, E.L. Atlas, F.C. Fehsenfeld, A. Fried, G.J. Frost, F.J.M. Harren, J.S. Holloway, B. Lefer, R. Lueb, J.F. Meagher, D.D. Parrish, M. Patel, L. Pope, D. Richter, C. Rivera, T.B. Ryerson, J. Samuelsson, J. Walega, R.A. Washenfelder, P. Weibring and X. Zhu
Environmental Science & Technology, 43, 2437-2442 (2009).
Inter-comparison of laser photoacoustic spectroscopy and gas chromatography techniques for measurements of ethene in the atmosphere
W.C. Kuster, F.J.M. Harren and J.A. de Gouw
Environmental Science & Technology, 39, 4581-4585 (2005).