Title :
Differential absorption spectroscopy for gas monitoring at sub-millimeter wavelengths
Author :
Han, P.Y. ; Sucha, G. ; Harter, D. ; Galvanauskas, A. ; Li, M. ; Zhang, X.-C.
Author_Institution :
Zhongyuan Univ. of Technol., Zhengzhou
Abstract :
A differential absorption spectroscopic system is developed for gas monitoring at sub-millimeter wavelengths. Tunable, narrowband terahertz (THz) pulse trains are generated using optical pulse trains obtained by an adjustable pulse shaping technique. By tuning the THz frequency at or away from the resonant frequency, differential data are obtained to determine the water vapor concentration. After the time delay between the THz pulse trains and optical pulse trains is properly set, real-time measurement can be implemented without scanning temporal THz waveform.
Keywords :
gas sensors; optical pulse shaping; submillimetre wave measurement; submillimetre wave spectra; submillimetre wave spectroscopy; THz frequency tuning; THz waveform; adjustable pulse shaping; differential absorption spectroscopic system; differential absorption spectroscopy; gas monitoring; narrowband terahertz pulse trains; optical pulse trains; resonant frequency; sub-millimeter wavelengths; tunable terahertz pulse trains; water vapor concentration; Absorption; Monitoring; Narrowband; Optical pulse generation; Optical pulse shaping; Optical pulses; Optical tuning; Pulse measurements; Pulse shaping methods; Spectroscopy;
Conference_Titel :
Infrared Millimeter Waves and 14th International Conference on Teraherz Electronics, 2006. IRMMW-THz 2006. Joint 31st International Conference on
Conference_Location :
Shanghai
Print_ISBN :
1-4244-0400-2
Electronic_ISBN :
1-4244-0400-2
DOI :
10.1109/ICIMW.2006.368520
