Measuring apparatus and method for the determination of particle concentrations in a fluid or aerosol, in particular the exhaust gases

摘要

It is a measuring device and a method for determining a particle concentration in a fluid or aerosol proposed by means of scattered light. The measuring device has a measuring chamber (10), a light source (11) and at least one light sensor (12a, 12b) for detecting a scattered radiation, whereby the light source (11) has an actual light power and a light beam (13a) is generated, which, as by means of light beam by the measuring chamber (10), and wherein a further light sensor (21) for detecting the actual optical power of the light source (11) is provided. The further light sensor (21), in the beam path of the light beam and supplies a the actual optical power of the light source (11) by means of light signal representing. The method provides that a monitoring measurement for determining the actual optical power of the light source (11) is carried out, and that in the subsequent measuring process a correction of the scattered light signals of the light sensors (12a, 12b) is carried out in such a way that a by changing the light power of the light source (11) is compensated for the scattered light signals change caused. The measuring device can be both for the measurement of the scattered light as well as for the measurement of the measuring technique) by means of light (opazimetrische be used. In addition, it is also a combination of the two measuring methods possible.