Hall effect measurement instrument with temperature compensation
First Claim
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1. An instrument measuring Hall Effect of at least one Hall sensor magnetically coupled with a target during a measurement session, comprising:
- a probe including the Hall sensor and a magnetic field source,a data processing and display console coupled with the probe with an electronic coupling means, the console further comprising,a Hall Effect measurement circuit connected with the Hall sensor via the coupling means, the Hall Effect measurement circuitry further including at least partially a four-wire ohmmeter circuit, which captures at least two pairs of differential signals from the Hall Effect sensor,a data acquisition and processing module configured to receive signals from the Hall Effect measurement circuit and provide at least two pairs of uncompensated raw signals based on the differential signals;
a temperature compensation module configured to compute based on the at least two pairs of uncompensated raw data to produce a temperature compensation index;
a measurement conversion module configured to provide a corrected Hall Effect measurement data by correcting the raw signal data using information corresponding to the temperature compensation index.
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Abstract
Disclosed is a Hall Effect instrument with the capability of compensating for temperature drift consistently, accurately and in real time of operation. The instrument embodies a four-point ohmmeter circuit measuring Hall Effect sensor resistance and tracking the effect of temperature on the Hall Effect sensor. The instrument takes into account a relationship between the temperature and a temperature compensation index on a per probe basis, which has exhibited a deterministic difference observed by the present inventor.
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Citations
20 Claims
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1. An instrument measuring Hall Effect of at least one Hall sensor magnetically coupled with a target during a measurement session, comprising:
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a probe including the Hall sensor and a magnetic field source, a data processing and display console coupled with the probe with an electronic coupling means, the console further comprising, a Hall Effect measurement circuit connected with the Hall sensor via the coupling means, the Hall Effect measurement circuitry further including at least partially a four-wire ohmmeter circuit, which captures at least two pairs of differential signals from the Hall Effect sensor, a data acquisition and processing module configured to receive signals from the Hall Effect measurement circuit and provide at least two pairs of uncompensated raw signals based on the differential signals; a temperature compensation module configured to compute based on the at least two pairs of uncompensated raw data to produce a temperature compensation index; a measurement conversion module configured to provide a corrected Hall Effect measurement data by correcting the raw signal data using information corresponding to the temperature compensation index. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An instrument measuring Hall Effect of at least one Hall sensor magnetically coupled with a target during a measurement session and a first probe including the Hall sensor and a first magnetic field source, or a second probe including the Hall sensor, a magnetic field source and a temperature sensor,
a data processing and display console coupled with the first or the second probe, one at a time, with an electronic coupling means, the console further comprising, a Hall Effect measurement circuit connected with the first or the second Hall sensor respectively via the coupling means, the Hall Effect measurement circuitry further including at least partially a four-wire ohmmeter circuit, which captures at least two pairs of differential signals from the Hall Effect sensor, a data acquisition and processing module configured to receive signals from the Hall Effect measurement circuit and provide at least two pairs of uncompensated raw based on the differential signals; a mode selection module operable to be switched to a first mode or a second mode corresponding either the first probe or the second probe is coupled; a temperature compensation module configured to compute based on the at least two pairs of uncompensated raw data and the temperature reading and a probe slope associated with the probe to produce a temperature compensation index; a measurement conversion module configured to provide a corrected Hall Effect measurement data by correcting the raw signal data using information corresponding to the temperature compensation index. - View Dependent Claims (17, 18, 19, 20)
Specification