Fuel concentration measurement of premixed mixture using spark-induced breakdown spectroscopy

N. Kawahara, E. Tomita, S. Takemoto, Y. Ikeda

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)


This study determined the local equivalence ratio of a CH4/air mixture in a laminar premixed flame using spark-induced breakdown spectroscopy (SIBS) with a fiber-coupled intensified charge coupled device (ICCD) spectrometer. Spectrally resolved emission spectra of plasma generated by a spark plug were investigated for their potential to measure local fuel concentrations in a premixed mixture. The influence of key parameters, such as the camera gate timing and spark energy, on the intensity of radical emission was illustrated. The intensity ratio of CN/NH had a greater sensitivity to the equivalence ratio than did that of CN/OH, and the local equivalence ratio could be obtained with high resolution by measuring the local intensity ratios of CN/NH. Moreover, a spark-plug sensor with an optical fiber was developed for application in spark-ignition engines. The atomic emission intensity during the breakdown and arc phases of spark discharge could be obtained using the fiber-optic spark-plug sensor. The Hα/O intensity showed better linearity than the CN/NH intensity ratio in lean mixtures. The results presented here confirm the use of SIBS as a diagnostic tool for spark-ignition engines.

Original languageEnglish
Pages (from-to)1085-1092
Number of pages8
JournalSpectrochimica Acta - Part B Atomic Spectroscopy
Issue number10
Publication statusPublished - Oct 2009


  • Equivalence ratio measurement premixed mixture
  • Mole fraction measurement
  • Spark-induced breakdown spectroscopy (SIBS)

ASJC Scopus subject areas

  • Analytical Chemistry
  • Atomic and Molecular Physics, and Optics
  • Instrumentation
  • Spectroscopy


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