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Optics Letters

Optics Letters


  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 7 — Apr. 1, 2014
  • pp: 1873–1876

Formaldehyde laser-induced fluorescence imaging with a multi-band transmission filter

Hendrik Thering, Lars Beckmann, Christian Jördens, Markus Röder, Thomas Dreier, and Christof Schulz  »View Author Affiliations

Optics Letters, Vol. 39, Issue 7, pp. 1873-1876 (2014)

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A method for laser-induced fluorescence (LIF) imaging of formaldehyde (CH2O) that discriminates against the interfering signal from polycyclic aromatic hydrocarbons (PAHs) is presented. This technique uses an interference filter with 11 transmission bands that closely match the most prominent fluorescence features of CH2O upon excitation at 355 nm. The signal increases by a factor of 12 with the multi-band filter compared to a single-band filter. Slight angle-tuning of the filter shifts the transmission maxima to the minima in between the CH2O-LIF features. The pixel-by-pixel difference between the images collected at the two filter angles thus provides CH2O images free of PAH interference, providing the capability for selective single-pulse CH2O-LIF imaging in engine combustion even under fuel-rich conditions.

© 2014 Optical Society of America

OCIS Codes
(120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics
(120.2440) Instrumentation, measurement, and metrology : Filters
(300.2530) Spectroscopy : Fluorescence, laser-induced
(300.6550) Spectroscopy : Spectroscopy, visible
(330.6180) Vision, color, and visual optics : Spectral discrimination

ToC Category:

Original Manuscript: December 11, 2013
Revised Manuscript: February 12, 2014
Manuscript Accepted: February 17, 2014
Published: March 21, 2014

Hendrik Thering, Lars Beckmann, Christian Jördens, Markus Röder, Thomas Dreier, and Christof Schulz, "Formaldehyde laser-induced fluorescence imaging with a multi-band transmission filter," Opt. Lett. 39, 1873-1876 (2014)

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