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Applied Optics

Applied Optics


  • Vol. 42, Iss. 12 — Apr. 20, 2003
  • pp: 2226–2235

Measurement of absolute minority species concentration and temperature in a flame by the photothermal deflection spectroscopy technique

Yunjing Li and Rajendra Gupta  »View Author Affiliations

Applied Optics, Vol. 42, Issue 12, pp. 2226-2235 (2003)

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It is experimentally demonstrated that absolute concentrations of minority species in flames can be measured by the photothermal deflection spectroscopy (PTDS) technique. In addition, the PTDS signal simultaneously yields the flame temperature at the measurement point. Absolute concentration profiles of OH have been measured in a flat-flame burner with methane as fuel. The PTDS measurements agree well with those obtained independently by the absorption technique. The flame temperature measurements by PTDS are also in good agreement with those obtained by the Boltzmann distribution among the rotational levels of OH.

© 2003 Optical Society of America

OCIS Codes
(120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics
(300.0300) Spectroscopy : Spectroscopy
(300.6430) Spectroscopy : Spectroscopy, photothermal
(350.5340) Other areas of optics : Photothermal effects

Original Manuscript: July 16, 2002
Revised Manuscript: December 19, 2002
Published: April 20, 2003

Yunjing Li and Rajendra Gupta, "Measurement of absolute minority species concentration and temperature in a flame by the photothermal deflection spectroscopy technique," Appl. Opt. 42, 2226-2235 (2003)

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