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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 33 — Nov. 20, 2009
  • pp: 6492–6500

Two-color-absorption sensor for time-resolved measurements of gasoline concentration and temperature

Sung Hyun Pyun, Jason M. Porter, Jay B. Jeffries, Ronald K. Hanson, Juan C. Montoya, Mark G. Allen, and Kevin R. Sholes  »View Author Affiliations


Applied Optics, Vol. 48, Issue 33, pp. 6492-6500 (2009)
http://dx.doi.org/10.1364/AO.48.006492


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Abstract

A midinfrared absorption sensor for crank-angle-resolved in-cylinder measurements of gasoline concentration and gas temperature for spark-ignition internal-combustion engines is reported, and design considerations and validation testing in the controlled environments of a heated cell and shock-heated gases are discussed. Mid-IR laser light was tuned to transitions in the strong absorption bands associated with C—H stretching vibration near 3.4 μm , and time-resolved fuel vapor concentration and gas temperature were determined simultaneously from the absorption at two different wavelengths. These two infrared laser wavelengths were simultaneously produced by difference-frequency generation, which combines a near-IR signal laser with two near-IR pump lasers in a periodically poled lithium niobate crystal. Injection current modulation of the pump lasers produced intensity modulation of the mid-IR, which allowed the transmitted signals from the two laser wavelengths to be detected on a single detector and separated by frequency demultiplexing. Injection current modulation produced a wavelength modulation synchronous with the intensity modulation for each of the laser wavelengths, and accurate measurement of the gasoline absorption signal required the effects of wavelength modulation to be considered. Validation experiments were conducted for a single-component hydrocarbon fuel (2,2,4-trimethyl-pentane, commonly known as iso-octane) and a gasoline blend in a heated static cell ( 300 T 600 K ) and behind planar shock waves ( 600 < T < 1100 K ) in a shock tube. With a bandwidth of 10 kHz , the measured fuel concentrations agreed within 5% RMS and the measured temperature agreed within 3% RMS to the known values. The 10 kHz bandwidth is sufficient to resolve 1 crank-angle degree at 1600 RPM .

© 2009 Optical Society of America

OCIS Codes
(120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics
(120.6780) Instrumentation, measurement, and metrology : Temperature
(300.1030) Spectroscopy : Absorption

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: July 21, 2009
Revised Manuscript: October 22, 2009
Manuscript Accepted: October 28, 2009
Published: November 16, 2009

Citation
Sung Hyun Pyun, Jason M. Porter, Jay B. Jeffries, Ronald K. Hanson, Juan C. Montoya, Mark G. Allen, and Kevin R. Sholes, "Two-color-absorption sensor for time-resolved measurements of gasoline concentration and temperature," Appl. Opt. 48, 6492-6500 (2009)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-48-33-6492

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