Solid-state log n-period System

A log n-period system with all solid-state components has been designed and tested. The logarithmic converter uses the logarithmic transfer relationship between the short-circuit collector current and the base-emitter voltage of a silicon transistor to convert an exponentially varying ion chamber cu...

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Veröffentlicht in:Nuclear instruments & methods 1967-01, Vol.48 (2), p.296-300
1. Verfasser: Byrd, J.S.
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description A log n-period system with all solid-state components has been designed and tested. The logarithmic converter uses the logarithmic transfer relationship between the short-circuit collector current and the base-emitter voltage of a silicon transistor to convert an exponentially varying ion chamber current to a linear voltage. The operational amplifier in the logarithmic converter has a junction-type field-effect transistor at its input for very high input impedance. To obtain the reactor period, the linear voltage is differentiated by a circuit whose damping is controlled by the level and rate of change of its input. This circuit adequately protects a nuclear reactor during startup. The overall system is accurate, reliable and stable.
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language eng
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subjects CONVERSION
DESIGN
ELECTRONIC EQUIPMENT
MONITORING
N26400 -Instrumentation-Miscellaneous Instruments & Components
NEUTRON FLUX
PULSES
REACTIVITY
REACTORS
SAFETY
SEMICONDUCTORS
title Solid-state log n-period System
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