Laser Doppler spectroscopy with smoothened spectra line shapes

摘要

Changes in electrophoretic mobility distribution of particles in an electric field, as determined by Doppler shifts of laser light scattered by the particles while undergoing oscillation, may be unambiguously measured when the electric field is produced by a frequency modulated square wave voltage. Diminished likelihood of potential ambiguities in the measurement is achieved by smoothing the scattered light spectra and reducing harmonic spectral structures.