Diagnostics

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A New Concept for Time-Resolved Fourier-Transform Spectroscopy
Post, November 22, 2013 • In developing the dual etalon frequency comb (DEFCOM) spectrometer, CRF researchers Haifeng Huang and David Chandler are refining a new concept for time-resolved Fourier-transform (FT) spectroscopy based on the interference between two transient frequency combs. By opening the door to many potential uses—including time-resolved, high-resolution, broad-band spectroscopy with a microsecond...
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New Polarized-Depolarized Measurement Capability Extends Use of Raman/Rayleigh Methods to More Flame Types
Post, February 26, 2014 • By Robert Barlow Allowing single-shot measurements of all major species in nonsooting flames of simple fuels, such as H2 and CH4, spontaneous Raman scattering has been a key CRF laser diagnostic technique for fundamental turbulent-combustion studies. However, laser-induced fluorescence from soot precursors tends to interfere significantly with Raman scattering signals—limiting...
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Novel Spectroscopic Method Reveals Intermediates over a Broad Spectrum
Post, December 2, 2013 • CRF researcher Leonid Sheps has developed a new spectroscopic method, Time-Resolved Broadband Cavity-Enhanced Absorption Spectroscopy (TR-BB-CEAS). The new technique is capable of following the time evolution of transient intermediates as they are produced and consumed in a gas-phase chemical reaction by monitoring their absorption of near-UV to visible light (300–700...
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SAE International Honors CRF Researchers for Outstanding Presentations
Post, July 25, 2014 • Joseph Oefelein Solid technical work is great—but the ability to communicate effectively about that work is equally critical. To acknowledge the importance of good communication—and maintain a high quality of presentation at its technical meeting—SAE International established the SAE Excellence in Oral Presentation award in 1972. This year, two Sandians,...
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Turbulent Jet Flame Database Generated for Sooty Fuels
Post, August 30, 2011 • Figure 1. Design drawings of burner (a and b), showing the central fuel tube surrounded by a perforated plate that supports small pilot flames for stabilizing high-speed flames. Photograph (c) of pilot flames and the base of an ethylene jet flame. The CRF has a long and distinguished history of...

UTRC and CRF researchers discuss turbine engines
Post, June 11, 2012 • On April 23, a group of combustion researchers from the United Technologies Research Center (UTRC) visited the CRF. Led by manager Dr. Catalin Fotache, the UTRC researchers met with senior managers Art Pontau and Andy McIlroy, manager Daniel Dedrick, and others to speak about experimental diagnostics, modeling and simulation with...