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Applied Optics

Applied Optics


  • Vol. 42, Iss. 12 — Apr. 20, 2003
  • pp: 2043–2051

Simultaneous in situ measurement of CO, H 2 O, and gas temperatures in a full-sized coal-fired power plant by near-infrared diode lasers

Holger Teichert, Thomas Fernholz, and Volker Ebert  »View Author Affiliations

Applied Optics, Vol. 42, Issue 12, pp. 2043-2051 (2003)

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We present what is to our knowledge the first near-infrared diode-laser-based absorption spectrometer that is suitable for simultaneous in situ measurement of carbon monoxide, water vapor, and temperature in the combustion chamber (20-m diameter, 13-m path length) of a 600-MW lignite-fired power plant. A fiber-coupled distributed-feedback diode-laser module at 1.56 μm served for CO detection, and a Fabry-Perot diode laser at 813 nm was used to determine H2O concentrations and temperature from multiline water spectra. Despite severe light losses (transmission, <10-3) and strong background radiation we achieved a resolution of 1.9 × 10-4 (1σ) fractional absorption, equivalent to 200 parts in 106 by volume of CO (at 1450 K, 105 Pa) with 30-s averaging time.

© 2003 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics
(140.0140) Lasers and laser optics : Lasers and laser optics
(140.2020) Lasers and laser optics : Diode lasers

Original Manuscript: May 20, 2002
Revised Manuscript: August 6, 2002
Published: April 20, 2003

Holger Teichert, Thomas Fernholz, and Volker Ebert, "Simultaneous in situ measurement of CO, H 2 O, and gas temperatures in a full-sized coal-fired power plant by near-infrared diode lasers," Appl. Opt. 42, 2043-2051 (2003)

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