Title :
Use of rotational sideband absorption for high sensitivity methane detection with a 1.64 mu m DFB laser
Author :
Weldon, V. ; Phelan, P. ; Hegarty, J.
Author_Institution :
Dept. of Phys., Trinity Coll., Dublin, Ireland
Abstract :
High sensitivity methane detection using a 1.64 mu m DFB laser in the rotational sideband of the 2v3 overtone region is demonstrated. A sensitivity of 2 ppm.m was achieved which is comparable with recent measurements in the purely vibrational Q branch and therefore relaxes the wavelength constraints of DFB lasers for methane sensing.
Keywords :
chemical variables measurement; distributed feedback lasers; gas sensors; infrared spectra of organic molecules and substances; infrared spectroscopy; laser transitions; measurement by laser beam; nonelectric sensing devices; organic compounds; semiconductor lasers; 1.64 micron; DFB laser; high sensitivity methane detection; methane sensing; rotational sideband absorption; wavelength constraints;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19921345
