Patent ID: 7480044

Claim:
A device for practicing a process for determining properties of liquid particles of engine exhaust gas, wherein the process comprises detecting Raman scattering produced in a test area by excitation with one of a laser, a laser diode, and a diode laser, and determining at least one of a type and composition of individual constituents of the liquid particles of the engine exhaust gas and concentrations of individual constituents of the liquid particles of the engine exhaust gas, the device comprising a test volume located inside an exhaust gas pipe and at least one of: a detector unit comprising one of optical fibers and parts of optical fibers and being structured and arranged to characterize the engine exhaust gas; a detector unit and a plurality of optical components and being structured and arranged to characterize the engine exhaust gas; and a device enclosing the engine exhaust gas and a device for one of avoiding contamination and reducing contamination.