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Measuring the mobility of charged aerosols by Schlieren interferometry of Doppler-shifted light

A new method for measuring the velocity of charged particles or droplets moving in applied electric fields is described. It uses a Schlieren system which selects symmetrical plus and minus diffraction orders and allows them to overlap and interfere, so that the best frequency due to the differential Doppler-shift can be recorded at a point in the image plane. The method is illustrated by its application to a monodisperse spray of electrically atomized kerosene, using a He-Ne laser as the light source. Its advantages are discussed and its range is assessed theoretically.