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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 45, Iss. 28 — Oct. 1, 2006
  • pp: 7498–7503

Optical sensors based on III-nitride photodetectors for flame sensing and combustion monitoring

Jose Luis Pau, Javier Anduaga, Carlos Rivera, Álvaro Navarro, Isabel Álava, Marcos Redondo, and Elías Muñoz  »View Author Affiliations

Applied Optics, Vol. 45, Issue 28, pp. 7498-7503 (2006)

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Combustion control requires visible photodetectors to sense the CH * CL emission at 430 nm that combined with a visible–blind UV photodetector allows us to obtain the OH * CH * ratio. UV–visible P-InGaN∕GaN multiple quantum well-N photodiodes with 15 18 mm 2 areas were fabricated to conduct OH * ( 308 nm ) and CH * CL detection without external filters. Bandpass detectors at 230 390 nm and 360 450 nm presented linear responses over five decades and rejection ratios > 10 3 at 430 and 308 nm , respectively. A full optical sensor system was built and detectors operated at 120 °C in a combustion chamber, showing linear responses within the dynamic range, maximum signal-to-noise ratios of 10 3 and response times of < 1 s . An exponential association dependence between the optical OH * CH * CL signals and the gas∕air ratios was found.

© 2006 Optical Society of America

OCIS Codes
(040.5160) Detectors : Photodetectors
(120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics
(160.6000) Materials : Semiconductor materials
(230.5590) Optical devices : Quantum-well, -wire and -dot devices

ToC Category:
Optical Devices

Original Manuscript: December 9, 2005
Revised Manuscript: May 16, 2006
Manuscript Accepted: May 22, 2006

Jose Luis Pau, Javier Anduaga, Carlos Rivera, Álvaro Navarro, Isabel Álava, Marcos Redondo, and Elías Muñoz, "Optical sensors based on III-nitride photodetectors for flame sensing and combustion monitoring," Appl. Opt. 45, 7498-7503 (2006)

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