Metallic debris detection sensor
First Claim
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1. A sensor having:
- a magnetic sensor head adapted to produce a magnetic field;
a magnetic field sensor responsive to changes in the magnetic field;
a temperature probe; and
processing means for determining the amount of material accumulated on the magnetic sensor head based on both magnetic field and temperature data;
whereinthe magnetic sensor head comprises two permanent magnetic or electromagnetic poles and the magnetic field sensor and the temperature sensor are located between the magnetic poles; and
the processing means is adapted to determine the amount of material accumulated on the magnetic sensor by comparing measured magnetic field and temperature data with data stored in a look up table (LUT), wherein the data stored in the look up table is specific for the associated sensor and comprises correction values for the change in magnetic field with temperature; and
whereinthe processing means is arranged to self calibrate the sensor by using the LUT to determine deviations in magnetic strength with time.
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Abstract
The present invention relates to a sensor arrangement. In particular, a sensor for the measurement of magnetically active or ferrous debris, for example, as generated as a result of machine wear. There is provided a sensor (5) having a magnetic sensor head adapted to produce a magnetic field, —a magnetic field sensor (10) responsive to changes in the magnetic field; a temperature probe (15); and processing means (50) for determining the amount of debris accumulated on the magnetic sensor head based on both magnetic field and temperature data.
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Citations
15 Claims
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1. A sensor having:
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a magnetic sensor head adapted to produce a magnetic field; a magnetic field sensor responsive to changes in the magnetic field; a temperature probe; and processing means for determining the amount of material accumulated on the magnetic sensor head based on both magnetic field and temperature data;
whereinthe magnetic sensor head comprises two permanent magnetic or electromagnetic poles and the magnetic field sensor and the temperature sensor are located between the magnetic poles; and the processing means is adapted to determine the amount of material accumulated on the magnetic sensor by comparing measured magnetic field and temperature data with data stored in a look up table (LUT), wherein the data stored in the look up table is specific for the associated sensor and comprises correction values for the change in magnetic field with temperature; and
whereinthe processing means is arranged to self calibrate the sensor by using the LUT to determine deviations in magnetic strength with time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for detecting magnetically active or ferrous material, the method including:
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providing a sensor having a magnetic sensor head adapted to produce a magnetic field, a magnetic field sensor responsive to changes in the magnetic field and a temperature probe, wherein the magnetic sensor head comprises two permanent magnetic or electromagnetic poles and the magnetic field sensor and the temperature sensor are located between the magnetic poles; measuring changes in the magnetic field; measuring the temperature of the sensor; and determining the amount of ferrous material accumulated in the magnetic sensor head based on both magnetic field and temperature data by comparing measured magnetic field and temperature data with data stored in a look up table (LUT), wherein the data stored in the look up table is specific for the associated sensor and comprises correction values for the change in magnetic field with temperature; and
self calibrating the sensor by using the LUT to determine deviations in magnetic strength with time.
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Specification