Patent US3597679A successfully refreshed from Google Patents.
US3597679A
Expired / Lapsed
US
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Device for measuring magnetic field strength using a hall probe and comprising means for suppressing alterations of the hall voltage due to temperature fluctuations
Assignee: Finnigan MAT GmbH
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Filing: 1969-03-10
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Granted: 1971-08-03
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Expires: 1989-03-10
Abstract
Abstract The invention provides a device for measuring magnetic field strength using a Hall probe and comprising means for suppressing alterations of the Hall voltage due to temperature fluctuations, said means comprising a thermal stabilization device for the Hall probe and a device for controlling the Hall current in such a way that the Hall voltage remains constant with a constant magnetic field.
Inventors
- 👤 Karleugen Habfast
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:18
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/02; G01R33/06; G01R33/07; H; H10; H10N; H10N52/00; H10N52/80
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
142 words
An apparatus for measuring the strength of a magnetic field comprising a Hall probe disposed in the magnetic field means for supplying a control current to the Hall probe, and means responsive to the output voltage of the Hall probe for providing a measure of the strength of the magnetic field, the improvement comprising means for maintaining the Hall probe within a predetermined temperature range, means for deriving a signal f(iH) that is a function of the control current to the Hall probe, means for providing a temperature signal f(tH) that is a function of the temperature of the Hall probe, and control means responsive to the f(iH) signal and the f(tH) signal, the control means causing the control current iH to the Hall probe to maintain the output voltage of the probe constant when the magnetic field is of constant strength.
Claim 2
Independent Claim
142 words
An apparatus for measuring the strength of a magnetic field comprising a Hall probe disposed in the magnetic field means for supplying a control current to the Hall probe, and means responsive to the output voltage of the Hall probe for providing a measure of the strength of the magnetic field, the improvement comprising means for maintaining the Hall probe within a predetermined temperature range, means for deriving a signal f(iH) that is a function of the control current to the Hall probe, means for providing a temperature signal f(tH) that is a function of the temperature of the Hall probe, and control means responsive to the f(iH) signal and the f(tH) signal, the control means causing the control current iH to the Hall probe to maintain the output voltage of the probe constant when the magnetic field is of constant strength.
Claim 3
Dependent Claim
104 words
The improvement according to claim 1, wherein, the means for providing the temperature signal f(tH) includes a sensor for sensing the temperature of the Hall probe and a first amplifier responsive to the output of the sensor, the output of the first amplifier being coupled to the control means the means for deriving the signal f(iH) includes a second amplifier, the output of the second amplifier being coupled to the control means, and the control means includes means for combining the f(iH) signal and the f(tH) signal to provide a regulating signal to the means which supplies the control current to the Hall probe.
Claim 4
Dependent Claim
57 words
The improvement according to claim 1 wherein the control means includes means for combining the f(iH) signal and the f(tH) signal, the combining means comprising a first resistor through which the control current iH flows, a voltage divider shunting the first resistor, and means for applying the temperature signal tH across a portion of the voltage divider.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |