WIDE RANGE MONITORING DEVICE

PURPOSE:To measure excellently neutron flux which varies over a wide range of >=10 digits by switching two measuring circuits which have different measurement ranges with hysteresis. CONSTITUTION:The neutron detected value of a nuclear reactor, etc., from a neutron detector 11 is supplied to a lo...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: FUKUSHIMA TOSHIKI, NISHIYAMA OSAMU, ENDOU YORIMASA
Format: Patent
Sprache:eng
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Beschreibung
Zusammenfassung:PURPOSE:To measure excellently neutron flux which varies over a wide range of >=10 digits by switching two measuring circuits which have different measurement ranges with hysteresis. CONSTITUTION:The neutron detected value of a nuclear reactor, etc., from a neutron detector 11 is supplied to a logarithmic count rate measuring circuit 23 which outputs a logarithmic value with linearity in a low and a high measurement range respectively and a Cambel measuring circuit 24. The logarithmic output of the measuring circuit 23 is applied to the 1st comparator 251 of a switching decision circuit 25 while supplied to a switching circuit 26; and the measured value is compared with a reference value which is widely set with hysteresis in both cases where the measured value consists of >=8 digits and =10 digits.