Part-per-million gas detection from long-baseline THz spectroscopy

Harmon, S. A.; Cheville, R. A.
September 2004
Applied Physics Letters;9/13/2004, Vol. 85 Issue 11, p2128
Academic Journal
We report a long-baseline THz time domain spectrometer based on a White cell design capable of detecting gas species in the low part-per-million range in near real time. Coherent transients from methyl chloride vapor are observed directly in the time domain using a 5.0 m path length at pressures down to 1 Pa. Both phase sensitive (lock-in) detection and direct signal averaging using a rapid-scanning delay line are used for data acquisition.


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