| 摘要 |
An improved instrument is provided for measuring electrophoretic mobility by reticle velocity measurements of laser illuminated particles. The instrument of the invention finds particular utility in industrial processing of colloidal suspensions, and particularly in the purification of industrial and drinking water. A laser beam is provided in the instrument of the invention which is focused on the particles in the sample solution which is contained in an electrophoretic cell. A reticle or grating is positioned such that the reflection of the laser beam from the particles passes through the reticle to a photo-tube placed on the other side of the reticle. Then, as the particles move through the solution the photo-tube is intermittently illuminated through the reticle and, as a result, generates a train of electric pulses whose frequency is directly proportional to the velocity of the particles, and is therefore a measure of electrophoretic mobility.
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