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A novel application of an open-ended microwave cavity in the field of on-line nuclear instrumentation, specifically to the determination of the void fraction in organic coolants used for cooling nuclear reactors, is presented. The sensor consists of a section of circular waveguide inserted in series with the piping system transporting the coolant. For the selected frequency of operation, the sensor section forms a resonant cavity whose resonant frequency, being a measure of the void fraction, can be automatically and continuously monitored by an electronic system.
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Stuchly et al. (1974) studied this question.
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