Laser measurements of polymer melt flow through nozzles. Part I. theoretical basis of measurements
and methodics of investigations
Publications on flow of polymer solutions and initial studies on polymer melt flow have been reviewed. Direct contactless measurements of flow of liquids and gases are possible with the use of the LDV method (Laser Doppler Velocimetry). The theoretical basis for laser measurements of velocity using the Doppler effect in optics is discussed. Advantages of the two-beam back-scattering method applied for polymer melt flow measurements have been characterized. The use of Bragg cell for the frequency shift and for the introduction of additional scattering particles into the polymer stream has been described.
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