Open AccessPulsed quantum cascade laser based hypertemporal real-time headspace measurements
Author(s) -
Toby K. Boyson,
Dylan Rittman,
Thomas G. Spence,
Maria E. Calzada,
Abhijit G. Kallapur,
Ian R. Petersen,
K. Paul Kirkbride,
David S. Moore,
C. C. Harb
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.010519
Subject(s) - nitromethane , quantum cascade laser , optics , materials science , spectroscopy , laser , absorption spectroscopy , cascade , cavity ring down spectroscopy , explosive material , wavelength , analytical chemistry (journal) , optoelectronics , physics , chemistry , organic chemistry , chromatography , quantum mechanics , thermodynamics
Optical cavity enhancement is a highly desirable process to make sensitive direct-absorption spectroscopic measurements of unknown substances, such as explosives, illicit material, or other species of interest. This paper reports advancements in the development of real-time cavity ringdown spectroscopy over a wide-bandwidth, with the aim to make headspace measurements of molecules at trace levels. We report results of two pulsed quantum cascade systems operating between (1200 to 1320)cm(-1) and (1316 to 1613)cm(-1) that measure the headspace of nitromethane, acetonitrile, acetone, and nitroglycerin, where the spectra are obtained in less than four seconds and contain at least 150,000 spectral wavelength datapoints.
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