Development of a radio frequency excited local impedance probe

Local void fraction measurements were made with a Karlsruhe type impedance probe. The probe was operated at radio frequency to minimize sensitivity to liquid phase resistivity. Two types of signal thresholding were used: level and derivative. A dual beam X-ray system was used as a calibration standa...

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Bibliographic Details
Published in:Nuclear engineering and design 1981-01, Vol.67 (1), p.125-136
Main Authors: Vince, M.A., Krycuk, G., Lahey, R.T.
Format: Article
Language:English
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Summary:Local void fraction measurements were made with a Karlsruhe type impedance probe. The probe was operated at radio frequency to minimize sensitivity to liquid phase resistivity. Two types of signal thresholding were used: level and derivative. A dual beam X-ray system was used as a calibration standard for the radio frequency excited impedance probe. Calibration was performed in vertical air/water flows. Derivative thresholding was found to be preferable to level thresholding, however, in both schemes hydrodynamic and surface tension effects were observed below a liquid superficial velocity of 0.5 m/s. Table salt (NaCl) was added to the water to verify the probe's response to changing water resistivity. Derivative thresholding appeared to work quite well but level thresholding was found to be inadequate due to the change in capacitance.
ISSN:0029-5493
1872-759X
DOI:10.1016/0029-5493(81)90160-6