Method and device including a bed of ferromagnetic fibers and magnetic flux sensor for measuring the amount of magnetic particles on a liquid
First Claim
1. A device for measuring the amount of magnetic particles in a liquid, said device including a magnet, a bed of ferromagnetic fibers supported in the magnetic field of said magnet to capture said particles as said liquid is passed through said bed and a means to measure the magnetic flux of the captured particles, wherein the improvement comprises:
- means providing a flow path for said liquid including said bed and a means to flow a known amount of said liquid along said flow path through said bed, said magnet comprising a pair of pole faces between which said bed is supported and having sufficient strength to substantially completely magnetize said particles, and said means to measure the magnetic flux comprising a magnetic flux sensor positioned between a pole face of said magnet and said bed, said bed being dimensioned such that the distance from said sensor to the fibers in said bed farthest from said sensor is not greater than about 6 millimeters.
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Abstract
An improved method and device for measuring magnetic particles in a liquid wherein a known amount of liquid is contacted with a bed of ferromagnetic fibers maintained in the magnetic field of a magnet with sufficient strength to substantially completely magnetize said particles for a time long enough for said particles to migrate to and be substantially completely captured by said fibers and having a magnetic flux sensor positioned between a pole face of said magnet and said bed wherein the distance from said sensor to the fibers farthest from said sensor is not greater than about 6 millimeters.
17 Citations
16 Claims
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1. A device for measuring the amount of magnetic particles in a liquid, said device including a magnet, a bed of ferromagnetic fibers supported in the magnetic field of said magnet to capture said particles as said liquid is passed through said bed and a means to measure the magnetic flux of the captured particles, wherein the improvement comprises:
means providing a flow path for said liquid including said bed and a means to flow a known amount of said liquid along said flow path through said bed, said magnet comprising a pair of pole faces between which said bed is supported and having sufficient strength to substantially completely magnetize said particles, and said means to measure the magnetic flux comprising a magnetic flux sensor positioned between a pole face of said magnet and said bed, said bed being dimensioned such that the distance from said sensor to the fibers in said bed farthest from said sensor is not greater than about 6 millimeters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for measuring the amount of magnetic particles in a liquid comprising:
- maintaining a bed of ferromagnetic fibers in the magnetic field between the pole faces of a magnet strong enough to substantially completely magnetize said particles to be measured, positioning a means to measure the magnetic flux from said bed between a pole face of said magnet and said bed wherein the distance between said means and the fibers farthest from said means is not greater than about 6 millimeters, measuring the magnetic flux from said bed to obtain a first flux value, passing a measured amount of said liquid through said bed at a flow rate sufficiently slow to permit said magnetic particles to become substantially completely captured by the fibers in said bed, measuring the flux value from said bed to obtain a second flux value, subtracting said first flux value from said second flux value to obtain a difference that is representative of the amount of magnetic particles in said
- View Dependent Claims (14, 15, 16)
Specification