TIME INTEGRATION METHOD TO DETERMINE THE CHARACTERISTIC PARAMETER OF A LIGHT EXTINCTIOMETER

The linear relation between the particle concentration and the output voltage of a light extinctiometer used to measure particle concentrati ons has been derived and calibrated. A time integration method was int roduced to determine the characteristic parameter of such a measuring system. This characteristic parameter which is proportional to the ext inction coefficient is found to be in good agreement with its theoreti cal value. As an example, in a vertical tube the increasing particle c oncentration was measured behind a developing flat interface between a gas and a gas-particle mixture as a function of time.