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Showing 1 to 5 of 5 for “"frequency-modulation spectroscopy"”.
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Extending frequency modulation spectroscopy : sensitive and selective high resolution laser absorption in the visible and ultraviolet
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1996.
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Application of sensitive spectroscopic techniques to intramolecular dynamics and combustion kinetics
Modifications of Cavity Ringdown Spectroscopy (CRD) for use in the UV region are discussed. These modifications partially overcome the low sensitivity of CRD in the UV (due to lower mirror reflectivity, R - 0.99) by removal of non-exponential contributions to the ringdown decay. We have also …
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Application of the FMCW method to quasi-distributed absorption sensors
… absorption sensors based on the frequency modulated continuous wave (FMCW) method. The sensor units consist of open-path micro-optic cells constructed from GRIN lenses, each of differing lengths. Guided by initial simulations, two approaches are experimentally investigated and …
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Using saturated absorption spectroscopy on acetylene-filled hollow-core fibers for absolute frequency measurements
Current portable near-infrared optical frequency references offer modest accuracy and instability compared to laboratory references. Low pressure reference cells are necessary to realize features narrower than the Doppler broadened overtone transitions, and most setups to date have occurred in …
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Environmental Monitoring - using diode-laser-based spectroscopic techniques
… tunable diode lasers was extended by use of sum-frequency generation. High-resolution ultraviolet spectroscopy of mercury isotopes around 254 nm was performed on low-pressure cells as well as at atmospheric pressure. Ultraviolet radiation around 300 nm, utilized for monitoring of sulfur dioxide …