Part-per-million gas detection from long-baseline THz spectroscopy
- 13 September 2004
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 85 (11) , 2128-2130
- https://doi.org/10.1063/1.1788896
Abstract
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 5.0m path length at pressures down to 1Pa. Both phase sensitive (lock-in) detection and direct signal averaging using a rapid-scanning delay line are used for data acquisition.Keywords
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