Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Spatially resolved tunable diode-laser absorption measurements of CO using optical Stark shifting

Not Accessible

Your library or personal account may give you access

Abstract

A tunable diode laser has been applied in optical Stark-modulated absorption spectroscopy to provide spatially resolved concentration measurements of CO. A cw IR probe beam from the diode laser was crossed with a nonresonant high-intensity beam from a Nd:YAG laser to generate a Stark-induced change in absorption in the crossing volume. The optical Stark-modulated absorption spectra were calculated showing the influence of experimental parameters including partial pressure of CO, total absorption path length, and intensity of the perturbing beam. The technique was demonstrated in a premixed atmospheric CH4–air flame and in a room temperature absorption cell, and good agreement was found between experiment and theoretical calculations. Thus far a spatial resolution of 0.5 cm has been achieved for time-averaged measurements of CO flame mole fractions of a few percent. Further improvements in the system should enable measurements of CO levels approaching 0.1% in flames with spatial resolution in the mm range and temporal resolution of 10 nsec.

© 1983 Optical Society of America

Full Article  |  PDF Article
More Like This
Laser absorption sampling probe for temporally and spatially resolved combustion measurements

S. M. Schoenung and R. K. Hanson
Appl. Opt. 21(10) 1767-1771 (1982)

Simultaneous temperature and sensitive two-species concentration measurements by single-shot CARS

Michel Pealat, P. Magre, P. Bouchardy, and G. Collin
Appl. Opt. 30(10) 1263-1273 (1991)

Diode laser sensor for measurements of CO, CO2, and CH4 in combustion flows

Radu M. Mihalcea, Douglas S. Baer, and Ronald K. Hanson
Appl. Opt. 36(33) 8745-8752 (1997)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (9)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Tables (1)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (5)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved