The laser diffraction technique constitute an easy and fast on line measurement of drop sizes. Based on the well known theory of diffraction, a laser diagnostic technique is described for the measurement of droplet size distribution. Limitations of the technique are studied to identify accuracy of measurements when applied to dense sprays (i.e. diesel fuel). Drop size measurements are then conducted for different diesel fuel under different conditions of injection and chamber pressures. Results lead to better understanding of the atomization process.

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