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The fuel film thickness resulting from fuel spray impingement on a flat transparent window was characterized in a high pressure high temperature cell for various thermodynamic conditions, injection pressures, injection durations, fuel types and injector technologies by Refractive Index Matching technique. The ambient conditions at injection timing were similar to that of a direct injection spark ignition engine at Top Dead Center, with the distance between the injector tip and the impinging surface set to 10 mm. The spray axis was set normal to the rough transparent window surface at ambient temperatures of 453 K, 573 K and 673 K, and ambient densities of 5.0 kg/m₃, 6.0 kg/m₃ and 6.5 kg/m₃. Injection pressures of 100 and 200 bar were investigated. Three injector technologies were studied: piezo-electric, multi-holes and swirl types. Two fuels, iso-octane and model gasoline, were tested.