High-sensitivity detection of molecular absorptions by semiconductor diode-lasers at wavelength lower than 2 MU-M
Authors: Cancio P., Pavone F.S.
Autors Affiliation: European Laboratory for Non-Linear Spectroscopy (LENS), L.go E. Fermi 2, I-50125, Firenze, Italy; Instituto de Estructura de la Materia, C.S.I.C. C/Serrano 123, E-28006, Madrid, Spain
Abstract: We present some recent measurements performed on absorption overtone transitions of molecular species, interesting for environmental and spectroscopic applications, by means of semiconductor diode laser at wavelengths lower than 2 μm. The characteristics of the semiconductor diode lasers needed for this application are described. Different detection techniques have been compared testing the sensitivity of the apparatus by means of absorption detection of Methane at 886 nm. A spectroscopic characterization of Ammonia at 1.65 μm and Acetylene at 789 nm have been performed by studying the pressure broadening behaviour at different temperatures. Sensitivity measurements of these molecules at atmospheric conditions have been done in order to know the minimum detectable concentration of the system. The measured values were 0.08 ppm/Km for NH3 in N2 and 0.2 ppm/Km for C2H2 in air.
Journal/Review: PHYSICA SCRIPTA
Volume: T58 Pages from: 86 to: 93
KeyWords: Laser sensors; Molecular spectroscopy; DOI: 10.1088/0031-8949/1995/T58/010Citations: 10data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2021-08-01References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here