method and device for determining the properties of a device in relation to particles

摘要

The present invention provides a method and apparatus for determining the particle response characteristic of a device. In accordance with the apparatus and the method, a fluid which can comprise a gas stream is passed through the device and an input pulse of particles is introduced into the fluid before entering the device. As a result, an output pulse of particles is produced in the fluid being discharged from the device. The input and output pulses of particles are recorded on the basis of particle count versus time. A sufficient number of repetitions are completed such that signal averaging of the input and output pulses of the particles produces statistically repeatable reference and response pulses of particles. A comparison between the reference and response pulses of particles is the particle response characteristic of the device.