Electricity: measuring and testing – Magnetic – Fluid material examination
Patent
1991-06-03
1993-05-25
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Fluid material examination
250225, 25022717, 3242441, 340631, G01N 2774, G01R 33032, G01R 3312, G02F 109
Patent
active
052143775
ABSTRACT:
A debris monitor apparatus and method and optical sensor apparatus and method that use the Faraday Effect to detect accumulation of debris on a magnetic probe. The probe contains a magnet and the optical sensor and is immersible in the fluid. As debris accumulates on the probe, the magnetic field changes. The optical sensor includes a magneto-optic material located within a portion of the changeable magnetic field, preferably near a node of the magnet. Means are provided to bi-directionally address the sensor magneto-optic material with linearly polarized light. Means are also provided to convert rotation of the light polarization angle into a modulation of the light's intensity. An electro-optic transducer converts the light intensity into electrical signals that indicate the quantity of debris accumulation on the probe, with a differentiated value of these signals with respect to time yielding rate of debris accumulation on the probe. Means are provided to calculate a ratio defined by the difference over sum of two bi-directionally transmitted pulses to provide a self-referenced output dependent only on the change in magnetic field caused by accumulation of debris on the probe. The changed magnetic field provides an inherent real-time memory of the accumulation of debris on the probe, which also permits multiplexed data collection.
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Maurice Lisa B.
Parkinson James R.
Spillman Jr. William B.
Lewis Leonard L.
Ronyak David M.
Simmonds Precision Products Inc.
Strecker Gerard R.
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