Abstract

Tunable diode lasers (TDL) near 2.7μm are used to measure high-resolution direct absorption and wave length modulation with second harmonic (WMS-2f) spectra at high pressures for two CO2 transitions near 3633.08 and 3645.20cm1, belonging to the ν1+ν3 vibrational band. Important factors influencing the design of a high-pressure TDL sensor and the variation of WMS-2f line shape with changes in pressure and laser parameters are discussed. Measurements of line strength and line broadening parameters are carried out for the 3645.20cm1 transition in an atmospheric-pressure, high-temperature cell. A room-temperature high-pressure cell is then used to measure the pressure shift for both CO2 transitions. Deviation of the direct absorption and wavelength division spectroscopy (WMS) spectra from the Lorentzian profile is studied in a high-density (9.2  amagats) CO2–Ar mixture. The WMS spectra are shown to be negligibly affected by non-Lorentzian effects up to 10atm and room temperature, in contrast with direct absorption. Measurements of CO2 concentration and temperature are carried out in nonreactive shock-tube experiments (P812atm, T8001200K) to validate the accuracy and precision of wavelength-modulation-spectroscopy-based sensing. CO2 time histories are then measured in heptane ignition experiments and compared with reaction kinetics mechanisms to demonstrate the use of this sensor in high-pressure combustion systems.

© 2009 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Quantum cascade laser absorption sensor for carbon monoxide in high-pressure gases using wavelength modulation spectroscopy

R. M. Spearrin, C. S. Goldenstein, J. B. Jeffries, and R. K. Hanson
Appl. Opt. 53(9) 1938-1946 (2014)

Calibration-free wavelength-modulation spectroscopy for measurements of gas temperature and concentration in harsh environments

Gregory B. Rieker, Jay B. Jeffries, and Ronald K. Hanson
Appl. Opt. 48(29) 5546-5560 (2009)

Extension of wavelength-modulation spectroscopy to large modulation depth for diode laser absorption measurements in high-pressure gases

Hejie Li, Gregory B. Rieker, Xiang Liu, Jay B. Jeffries, and Ronald K. Hanson
Appl. Opt. 45(5) 1052-1061 (2006)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

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

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 OSA member, or as an authorized user of your institution.

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

Figures (20)

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

Contact your librarian or system administrator
or
Login to access OSA 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 OSA member, or as an authorized user of your institution.

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

Equations (11)

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

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

Metrics

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

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