A Torsional Strain and Vibration Monitor for the Motor-Generator Shaft of the Zero Gradient Synchrotron (ZGS)

A monitoring system has been developed for measuring the torsional strains and torsional vibrations produced in the motor-generator shaft by the pulsed operation of the ring magnet of the ZGS. The detection of these vibrations makes it possible to readjust the ring magnet cycle to prolong the life of the shaft. The monitoring system uses stainless steel bands mounted on the shaft. These bands contain engraved markings that are sensed by the optical system that controls the digital electronics. The system makes over 800 digital measurements of strain during each revolution of the generator shaft. Alarms and shutdown circuits are activated if the strain exceeds a safe limit. A digital-to-analog (d-to-a) converter produces an output for displaying strain and vibrations on a conventional oscilloscope.