Method and remotely adjustable reactive and resistive electrical elements

• US 8,816,566 B2
• Filed: 10/30/2012
• Issued: 08/26/2014
• Est. Priority Date: 03/06/2009
• Status: Active Grant

• Current Assignee: Life Services, LLC
• Original Assignee: Life Services, LLC, Regents of The University of Minnesota (University of Minnesota)
• Inventors: Snyder, Carl J. Jr., Vaughan, John Thomas Jr., Lemaire, Charles A.
• Primary Examiner(s): DOUGHERTY, THOMAS M
• Application Number:
  US13/664,391
• Publication Number:
  US 20130063319A1
• Time in Patent Office: 665 Days
• Field of Search: 310/311, 310314-319, 310/328
• US Class Current: 310/318
• CPC Class Codes: G01R 33/34092 RF coils specially adapted for NMR spectrometers
• CPC Class Codes: G01R 33/3628 Tuning/matching of the transmit/receive coil
• CPC Class Codes: H01Q 1/103 Latching means; ensuring extension or retraction thereof
• CPC Class Codes: H01Q 3/02 using mechanical movement of antenna or antenna system as a whole
• CPC Class Codes: H01Q 3/44 varying the electric or magnetic characteristics of reflecting, refracting, or diffracting devices associated with the radiating element
• CPC Class Codes: H02N 2/0075 Electrical details, e.g. drive or control circuits or methods
• CPC Class Codes: H02N 2/043 Mechanical transmission means, e.g. for stroke amplification
• CPC Class Codes: H02N 2/046 for conversion into rotary motion
• CPC Class Codes: H10N 30/802 Drive or control circuitry or methods for piezoelectric or electrostrictive devices not otherwise provided for

Abstract

Apparatus and method that includes providing a variable-parameter electrical component in a high-field environment and based on an electrical signal, automatically moving a movable portion of the electrical component in relation to another portion of the electrical component to vary at least one of its parameters. In some embodiments, the moving uses a mechanical movement device (e.g., a linear positioner, rotary motor, or pump). In some embodiments of the method, the electrical component has a variable inductance, capacitance, and/or resistance. Some embodiments include using a computer that controls the moving of the movable portion of the electrical component in order to vary an electrical parameter of the electrical component. Some embodiments include using a feedback signal to provide feedback control in order to adjust and/or maintain the electrical parameter. Some embodiments include a non-magnetic positioner connected to an electrical component configured to have its RLC parameters varied by the positioner.

Claims

1. A method comprising:

providing an electrical component having a characteristic impedance at a first frequency; and

based on an electrical feedback signal, automatically moving, using a non-magnetic mechanical-movement device, a movable portion of the electrical component in relation to another portion of the electrical component to change both the characteristic impedance and the first frequency.

2. The method of claim 1, wherein the moving using the non-magnetic mechanical-movement device comprises moving using a piezo-electric motor.

3. The method of claim 1, wherein the electrical component comprises an inductor, and wherein at least one of its parameters includes an inductance.

4. The method of claim 1, wherein the electrical component comprises a capacitor, and wherein at least one of its parameters includes a capacitance.

5. The method of claim 1, wherein the electrical component comprises a resistor, and wherein at least one of its parameters includes a resistance.

15. The method of claim 1, wherein the electrical component includes a first antenna element having a movable portion that moves relative to another portion, the first antenna element having an adjustable resonant frequency, the computer-readable medium further comprising instructions such that, based on an electrical signal, the automatically moving moves the movable portion of the first antenna element in order to vary the adjustable resonant frequency.

16. The method of claim 1, wherein the electrical component includes a first antenna element having an adjustable length, and wherein the automatically moving changes the length of the first antenna element.

17. The method of claim 1, wherein the electrical component includes a plurality of antenna elements having a resonant frequency, and wherein the automatically moving, using a non-magnetic mechanical-movement device results in adjusting the resonant frequency and the characteristic impedance of the plurality of antenna elements at the resonant frequency.

18. The method of claim 1, further comprising using a programmable information-processing device operatively coupled to control the automatically moving of the movable portion of the electrical component.

19. The method of claim 1, wherein the electrical component comprises a first antenna element having an electrical length, and wherein the automatically moving, using a non-magnetic mechanical-movement device includes adjusting the electrical length of the first antenna element.

6. A computer-readable medium having instructions stored thereon for causing a suitably programmed information processor to execute a method that comprises:

providing an electrical component having a characteristic impedance at a first frequency; and

based on an electrical feedback signal, automatically moving, using a non-magnetic mechanical-movement device, a movable portion of the electrical component in relation to another portion of the electrical component to change both the characteristic impedance and the first frequency.

7. The computer-readable medium of claim 6, wherein the moving using the non-magnetic mechanical-movement device comprises moving using a piezo-electric motor.

8. The computer-readable medium of claim 6, wherein the electrical component comprises an inductor, and wherein at least one of its parameters includes an inductance.

9. The computer-readable medium of claim 6, wherein the electrical component comprises a capacitor, and wherein at least one of its parameters includes a capacitance.

10. The computer-readable medium of claim 6, wherein the electrical component comprises a resistor, and wherein at least one of its parameters includes a resistance.

11. The computer-readable medium of claim 6, wherein the electrical component includes a first antenna element having a movable portion that moves relative to another portion, the first antenna element having an adjustable resonant frequency, the computer-readable medium further comprising instructions such that, based on an electrical signal, the automatically moving moves the movable portion of the first antenna element in order to vary the adjustable resonant frequency.

12. The computer-readable medium of claim 6, wherein the electrical component includes a first antenna element having an adjustable physical length, and wherein the computer-readable medium further includes instructions such that the automatically moving changes the physical length of the first antenna element.

13. The computer-readable medium of claim 6, wherein the electrical component includes a plurality of antenna elements having a resonant frequency, and wherein the computer-readable medium further includes instructions such that the automatically moving results in adjusting the resonant frequency and the characteristic impedance of the plurality of antenna elements at the resonant frequency.

14. The computer-readable medium of claim 6, wherein the electrical component comprises a first antenna element having an electrical length, and wherein the automatically moving, using a non-magnetic mechanical-movement device includes adjusting the electrical length of the first antenna element.

20. An apparatus comprising:

an electrical component having a characteristic impedance at a first frequency; and

an information-processing control system that, based on an electrical feedback signal, automatically moves, using a non-magnetic mechanical-movement device, a movable portion of the electrical component in relation to another portion of the electrical component to change both the characteristic impedance and the first frequency.