Patent ID: 8937718
Filing Date: 2015-01-20
Classification: G01N

Abstract:
1. A calibration apparatus for calibrating a scattered-light measuring device that measures a particle concentration in motor vehicle exhaust gases, the calibration apparatus comprising: at least one scattering body, wherein the scattering body includes a carrier material that has a number of scattering centers which are disposed in such a way that the scattering body, upon irradiation with light, delivers scattered light having an intensity and a distribution defined by the scattering body, wherein the scattering body includes one of at least one toned layer and a gray glass filter disposed on a surface of the scattering body, wherein the one of the at least one toned layer and the gray glass filter one of attenuates and dampens light that one of enters and exits through the one of the at least one toned layer and the gray glass filter.