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In this paper the systematic development of an optical swirl sensor to measure the swirl ratio in an operating serial turbocharged DI-diesel engine is described. The optical sensor detects the visible light of the combustion, in particular the emission of the sooting flame in a wavelength range from 600 nm up to 1000 nm. The acceptance angle is so small that the soot clouds from every spray can be detected as they are beeing turned under the optical sensor by the swirling flow. In a first partdoi:10.19206/ce-117130 fatcat:eorfojq73faabjfp6zvjm7a2cq