Hall probe simulator circuit
AssigneeUniversity of Denver
InventorsGareth R. Eaton, Richard W. Quine
Life of this patent
Estimating the term…
Abstract
A simulated Hall probe, provide EPR coil driver, and/or perform a time-domain full scan sinusoidal deconvolution of EPR signals. The simulated Hall probe can return a Hall Effect voltage from a coil current that creates a magnetic field within a coil magnet and the reference current that would be fed to an actual Hall probe. From these values, the Hall Effective voltage can be determined which can be used to determine the magnetic field flux, which can then be used to regulate the magnetic field.
Claims19
A Hall probe simulator circuit for producing a simulated Hall effect voltage VH generatable by a Hall probe if the Hall probe were placed in a magnetic field created within a coil of wire, without actual use of the Hall probe, the Hall probe simulator circuit comprising:
- a reference current input configured to measure a reference voltage across a reference resistor by converting a reference current which is input into the reference resistor into a measured reference voltage VR;
- a current sensor comprising a current sense resistor configured to sense a coil current in the coil of wire;
- a controller coupled with the reference current input and the current sensor, wherein the controller is configured to produce the simulated Hall effect voltage VH, wherein producing the simulated Hall effect voltage VH comprises a multiplier for multiplying the sensed coil current times the measured reference voltage VR and a constant;
- and
- a water-cooled heat sink,
- wherein the current sense resistor is attached to the water-cooled heat sink,
- wherein the water-cooled heat sink is also used for a magnet power supply, and
- wherein the current sense resistor has a low resistance and a low temperature coefficient.
A method for operating a Hall probe simulator circuit for producing a simulated Hall Effect voltage VH generatable by a Hall probe if the Hall probe were placed in a magnetic field created within a coil of wire, without actual use of the Hall probe, the method comprising:
- sensing a coil current in the coil of wire using a current sense resistor of a current sensor;
- sensing a reference voltage across a reference resistor so as to by converting a reference current input into the reference resistor into a measured reference voltage VR;
- producing the simulated Hall effect voltage VH using a controller coupled with the reference current input and the current sensor by using a multiplier to multiply the coil current times the measured reference voltage and a constant;
- attaching the current sense resistor to a water-cooled heat sink such that the current sense resistor exhibits a low resistance and a low temperature coefficient;
- and
- using the water-cooled heat sink for a magnet power supply.
A Hall probe simulator circuit for producing a simulated Hall effect voltage VH generatable by a Hall probe if the Hall probe were placed in a magnetic field created within a coil of wire, without actual use of the Hall probe, the Hall probe simulator circuit comprising:
- a reference current input configured to measure a reference voltage across a reference resistor by converting a reference current which is input into the reference resistor into a measured reference voltage VR;
- and
- a current sensor comprising a current sense resistor configured to sense a coil current in the coil of wire;
- a controller coupled with the reference current input and the current sensor, wherein the controller is configured to produce the simulated Hall effect voltage VH, wherein producing the simulated Hall effect voltage VH comprises multiplying the sensed coil current times the measured reference voltage VR and a constant;
- and
- a switch configured to enable switching between using the Hall probe simulator circuit and an actual Hall probe, the actual Hall probe being separate from the Hall probe simulator circuit,
- wherein the Hall probe simulator is configured to:
- detect a signal phase from the actual Hall probe,
- adjust a signal phase of the Hall probe simulator to match the signal phase from the actual Hall probe, and
- engage a phase reversal switch, which can allow for connecting a magnet current so that it flows in either direction through the Hall probe simulator circuit.
Dependencies are inferred from the claim text.