The number of electrical pulses counted for a given period of time is directly proportional to flow volume. A tachometer can be added to measure the turbine's rotational speed and to determine the liquid flow rate. Turbine meters, when properly specified and installed, have good accuracy, partic...
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In FIG. 2, the optical disc 1 is rotated by a motor 15 at a constant speed regulated by a speed control means 18 in cooperation with a tachometer 16. For the purpose of recording and reproduction, a laser beam (shown by broken line) from a laser beam source 6 is applied to the op...