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.
Differential absorption spectroscopy for gas monitoring at sub-millimeter wavelengths
2006-09-01
1216259 byte
Conference paper
Electronic Resource
English
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