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Test results on an electromagnetic current sensor with an "open" design
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1976
[PDF-4.58 MB]
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Description:An electromagnetic current sensor with a unique "open" design was developed by J. R. Olson of the Naval Undersea Center. It was tested for steady flow accuracy and cosine response in the horizontal and vertical planes. The sensor's configuration was designed to minimize hydrodynamic disturbances of the current flow and to offer good linearity and directivity response. Test data revealed the sensor's steady-flow measurement uncertainty to be ±2.5 percent of full scale. Horizontal directivity errors were less than ±4 cm/s and 5 cm/s for half- and one-knot test flows. The major contributor of error for the cosine response was determined to be an imbalance in amplifier gain between the sensor's two measuring axes. Vertical directivity results were too noisy for reliable analysis, and the problem was believed to be caused by a distortion of the sensor's magnetic field during testing.
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Rights Information:Public Domain
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