DEVICE FOR DETERMINING THE COMPOSITION OF FLUIDS, IN PARTICULAR THE CONSTITUENTS OF EXHAUST GASES OF INTERNAL COMBUSTION ENGINES

摘要

A device is useful for determining the composition of fluids, in particular the constituents of exhaust gases of internal combustion engines. A light beam (32, 31) passes through the waste gas along the length of a measurement section (29) and becomes more or less weakened or modified in function of the content of the constituents. The light signal received is advantageously recorded by a measurement section light sensor (18), which is shielded from the light source (14) that emits the light, and is evaluated in relation to the original light emission in an evaluation circuit (26). The device lends itself to simple and accurate determination of the turbidity of the waste gas or of the content of optically active constituents in a fluid or gas.