System and method for temperature compensation of eddy current sensor waveform parameters
First Claim
1. A method of compensating for temperature variations in an eddy current sensor signal, the method comprising the steps of:
- receiving an initial signal from an eddy current sensor (ECS) in response to a conductive element passing the ECS;
sensing an ECS temperature and an ECS board temperature;
retrieving values for a subset of correction coefficients based on at least one of the ECS temperature and the ECS board temperature;
computing a temperature correction factor from the values for the subset of correction coefficients; and
applying the temperature correction factor to the initial signal.
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Abstract
An embodiment of the invention generally pertains to a method of compensating for temperature variations in an eddy current sensor signal. The method may include the steps of receiving an initial signal from an eddy current sensor (ECS) in response to a conductive element passing the ECS and sensing an ECS temperature and an ECS board temperature. The method may also include determining a subset of correction coefficients based on the ECS temperature and the ECS board temperature and determining a temperature correction factor from the subset of correction coefficients. The method may then compute a temperature corrected signal from the initial signal and the temperature correction factor.
47 Citations
22 Claims
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1. A method of compensating for temperature variations in an eddy current sensor signal, the method comprising the steps of:
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receiving an initial signal from an eddy current sensor (ECS) in response to a conductive element passing the ECS; sensing an ECS temperature and an ECS board temperature; retrieving values for a subset of correction coefficients based on at least one of the ECS temperature and the ECS board temperature; computing a temperature correction factor from the values for the subset of correction coefficients; and applying the temperature correction factor to the initial signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of compensating for temperature variations in an eddy current sensor signal, the method comprising the steps of:
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generating an initial signal from an eddy current sensor (ECS) in response to a conductive element passing by the ECS; receiving in a sensor electronics board the initial signal; producing a waveform signal from the initial signal; receiving, in a temperature compensation module, the waveform signal from the sensor electronics board; receiving, in the temperature compensation module, an ECS temperature and an sensor electronics board temperature; retrieving values for a subset of correction coefficients, each value being based on at least one of the ECS temperature and the sensor electronics board temperature; computing a temperature correction factor from the values for the subset of correction coefficients; determining from the waveform signal a waveform parameter; computing a normalized waveform parameter from the temperature correction factor and the waveform parameter; and determining a standoff distance from the normalized waveform parameter, the standoff distance being a distance between the ECS and the conductive element. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification