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Adua1 ・ wavelengthlaser absorption − scattehng ( 1、 AS ) technique was developed to analyze the mixture formation precess in a D ， 1． gaseline spray ． P ・ xylene was used as a test fuel and the second harmonic ( 532nm ) and the feurth harmonic( 266nm ) of an Nd ： YAG laser were simultaneously illuminated the spray ， which was 血 jected into a high tempera 加 re and high pressure constant volume vesse1 ． The dual ・ wave length LAS 血 ages were acquired by two CCD ca 皿 eras and processed by a computer ． The distributions of droplets and vapor concentrations