Particle measuring device and method for determining the particle mass concentrations in aerosols

摘要

A particle measuring device (1) for determining particle mass concentrations in aerosols has a radiation source (2), which is designed as a laser diode (2), and a measurement receiving part (7), by means of which light emitted by the laser diode (2) through an aerosol can be received and In order to generate reliable and correct particle measurement signals over a long period of time, it is proposed that a radiation power of the laser diode (2) with a frequency that is considerably higher than a cut-off frequency of the measurement receiving part (7) can be modulated, that over the duration of a measurement signal of the measurement receiving part (7) there is on average a predeterminable radiation power of the laser diode (2).