LOGARITHMIC-AMPLIFIER PERIOD METER
A. Pearson, Y.J. Fokkinga · OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) · 1959
A logarithic device is described that can be used for the following applications: monitoring log power and log rate during reactor startup without range switching; reactor control during part of the startup cycle for reactors with automatic startup and, if made linear tn the reactor operating range, control in that range; gamma monitoring if combined with a suitable ion chamber; and service as a simple reactor simulator if modified to obtain the antilogarithm of an input. The instrument is completely transistorized except for one vacuum tube serving as the logarithmic element. An electromechanical servo loop provides an isolated logarithmic output signal, and a tachometer linked to the servo-motor provides a log-rate or period signal. (J.H.M.)