Part-per-million gas detection from long-baseline THz spectroscopy
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 5.0 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.
Citation
Harmon, S. A., & Cheville, R. A. (2004). Part-per-million gas detection from long-baseline THz spectroscopy. Applied Physics Letters, 85(11), 2128-2130. https://doi.org/10.1063/1.1788896