3.39μm赤外吸収法による炭化水素燃料濃度の計測

概要

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The 3.39μm He-Ne infrared laser absorption technique is useful for measuring hydrocarbon concentration. To measure the concentration of propane or methane in hydrocarbon fuels, molar absorption coefficients for 3.39μm wavelength were investigated in the temperature range 285〜420K and in the pressure range l00〜800 kPa. It was found that the absorption coefficient εis independent of temperature, and the pressure has little effect on εin propane, but a strong effect on εin methane. By means of this technique, the fuel concentration in the vicinity of a spark plug and HC concentration in an exhaust pipe of a spark ignition engine were measured under the condition of no residual gas and homogeneous mixture. For the lean mixture operating condition, although cycle-to-cycle fluctuation of the fuel concentration was very small, the fluctuation of pressure in the cylinder was large.
一般社団法人日本機械学会の論文
1996-03-25