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公开(公告)号：US20200018624A1
公开(公告)日：2020-01-16
申请号：US16031197
申请日：2018-07-10
申请人： EPRO GMBH
发明人： G. Peter Tasche , Michael Schlereth , Ulf Overkamp
摘要： A method for calibrating an eddy current sensor for temperature. Both frequency and one of voltage and current of an oscillator driving the eddy current sensor are measured at a plurality of temperatures and a plurality of target surface distances. Temperature equations are regressed to fit the measured frequency and one of the voltage and the current for each temperature, where the temperature equations have a common number of equivalent factors, and factor equations are regressed for each of the equivalent factors. A gain adjustment and an offset adjustment pair for each of the plurality of temperatures is determined for an oscillator associated with the eddy current sensor, that compensates an output of the eddy current sensor to a standard temperature. A gain equation is regressed to fit the determined gain adjustments, and an offset equation is regressed to fit the determined offset adjustments. The temperature equations, factor equations, gain equation, and offset equation are provided with the eddy current sensor.
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公开(公告)号：US10684148B2
公开(公告)日：2020-06-16
申请号：US16031197
申请日：2018-07-10
申请人： EPRO GMBH
发明人： G. Peter Tasche , Michael Schlereth , Ulf Overkamp
摘要： A method for calibrating an eddy current sensor for temperature. Both frequency and one of voltage and current of an oscillator driving the eddy current sensor are measured at a plurality of temperatures and a plurality of target surface distances. Temperature equations are regressed to fit the measured frequency and one of the voltage and the current for each temperature, where the temperature equations have a common number of equivalent factors, and factor equations are regressed for each of the equivalent factors. A gain adjustment and an offset adjustment pair for each of the plurality of temperatures is determined for an oscillator associated with the eddy current sensor, that compensates an output of the eddy current sensor to a standard temperature. A gain equation is regressed to fit the determined gain adjustments, and an offset equation is regressed to fit the determined offset adjustments. The temperature equations, factor equations, gain equation, and offset equation are provided with the eddy current sensor.
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