title: Method for obtaining gas concentration with a phase-based metrology system.
abstract: A new technique is presented for obtaining gas concentration by measuring the slope of the anomalous dispersion at a resonance. We describe the equations that govern this process using a Lorentz model and show that the slope of the anomalous dispersion is directly related to the absorption coefficient. The slope is obtained from an interferometric setup and a frequency modulation spectroscopy technique. Experimental data are presented that illustrate this technique for two different sample cells containing water vapor.
authors.forename: C R
authors.initials: CR
authors.lastname: Schwarze
authors.forename: J A
authors.initials: JA
authors.lastname: Gargas
authors.forename: J H
authors.initials: JH
authors.lastname: Rentz
authors.forename: M
authors.initials: M
authors.lastname: Hercher