End-gas temperature measurements in a DOHC spark-ignition engine using CARS

We adopted a broadband CARS technique to measure end-gas temperatures in a combustion chamber of a conventional 4-cylinder DOHC spark-ignition engine. A mobile CARS system measured a full CARS spectrum on a shot by shot basis. The system consisted of a frequency doubled Nd:YAG laser (Continuum Surlite II), broadband modeless dye laser and a monochromator equipped with an optical multi-channel analyzer (RG&G 1420).