Q-damping circuit including a diode acting as a resistor for damping a high temperature superconductor self-resonant coil in a nuclear quadrupole resonance detection system

• US 7,292,041 B2
• Filed: 11/23/2004
• Issued: 11/06/2007
• Est. Priority Date: 11/24/2003
• Status: Expired due to Fees

• Current Assignee: E. I. du Pont de Nemours and Company (Corteva, Inc.)
• Original Assignee: E. I. du Pont de Nemours and Company (Corteva, Inc.)
• Inventors: Laubacher, Daniel B., Alvarez, Robby L.
• Primary Examiner(s): Gutierrez; Diego
• Assistant Examiner(s): Vargas; Dixomara
• Application Number:
  US10/996,396
• Publication Number:
  US 20050140371A1
• Time in Patent Office: 1,078 Days
• Field of Search: 324300-322, 333 1-212, 333219-235
• US Class Current: 324/322
• CPC Class Codes: G01V 3/14 operating with electron or nuclear magnetic resonance
• CPC Class Codes: H04N 21/47 End-user applications

Abstract

The use of a bias controlled diode in the Q-damping circuit of a high temperature superconductor transmit, receive, or transmit and receive self-resonant coil in a nuclear quadrupole resonance detection system results in improved performance. The diode is operated with a forward bias such that the diode is resistive with a resistance of about 10 to about 1000 ohms.

Claims

1. A nuclear quadrupole resonance detection system, comprising a high temperature superconductor self-resonant transmit and receive coil and a Q-damping circuit for the transmit and receive coil, wherein the Q-damping circuit comprises a diode operated with a forward bias such that the diode has a resistance of about 10 to about 1000 ohms and is able to provide all needed Q-damping circuit resistance.

2. The nuclear quadrupole resonance detection system of claim 1, wherein the resistance is from about 100 to about 800 ohms.

3. The nuclear quadrupole resonance detection system of claim 2, wherein the resistance is from about 500 to about 650 ohms.

4. The nuclear quadrupole resonance detection system of any of claims 1-3, further comprising a single loop or coil to inductively couple the Q-damping circuit to the high temperature superconductor self-resonant transmit and receive coil.

5. The nuclear quadrupole resonance detection system of claim 4, wherein the single loop or coil comprises a high temperature superconductor.

6. The nuclear quadrupole resonance detection system of claim 4, wherein the single loop or coil is copper.

7. The nuclear quadrupole resonance detection system of any of claims 1-3, further comprising a high temperature superconductor single loop to inductively couple the Q-damping circuit to the high temperature superconductor self-resonant transmit and receive coil.

8. The nuclear quadrupole resonance detection system of any of claims 1-3, further comprising a copper single loop to inductively couple the Q-damping circuit to the high temperature superconductor self-resonant transmit and receive coil.

9. The nuclear quadrupole resonance detection system of any of claims 1-3, wherein the Q-damping circuit further comprises a capacitor and an inductor.

10. A nuclear quadrupole resonance detection system, comprising a high temperature superconductor self-resonant transmit coil and a Q-damping circuit tot the transmit coil, wherein the Q-damping circuit comprises a diode operated with a forward bias such that the diode has a resistance of about 10 to about 1000 ohms and is able to provide all needed Q-damping in circuit resistance.

11. The nuclear quadrupole resonance detection system of claim 10, wherein the resistance is from about 100 to about 800 ohms.

12. The nuclear quadrupole resonance detection system of claim 11, wherein the resistance is from about 500 ohms to about 650 ohms.

13. The nuclear quadrupole resonance detection system of any of claims 10-12, further comprising a single loop, or coil to inductively couple the Q-damping circuit to the high temperature superconductor self-resonant transmit coil.

14. The nuclear quadrupole resonance detection system of claim 13, wherein the single loop or coil comprises a high temperature superconductor.

15. The nuclear quadrupole resonance detection system of claim 13, wherein the single loop or coil is copper.

16. The nuclear quadrupole resonance detection system of any of claims 10-12, further comprising a high temperature superconductor single loop to inductively couple the Q-damping circuit to the high temperature superconductor self-resonant transmit coil.

17. The nuclear quadrupole resonance detection system of any of claims 10-12, further comprising a copper single loop to inductively couple the Q-damping circuit to the high temperature superconductor self-resonant transmit coil.

18. The nuclear quadrupole resonance detection system of any of claims 10-12, wherein the Q-damping circuit further comprises a capacitor and an inductor.

28. The nuclear quadrupole resonance detection system of any of claims 3, 12 and 21, wherein the resistance is about 600 ohms.

19. A nuclear quadrupole resonance detection system, comprising a high temperature superconductor self-resonant receive coil and a Q-damping circuit for the receive coil, wherein the Q-damping circuit comprises a diode operated with a forward bias such that the diode has a resistance of about 10 to about 1000 ohms and is able to provide all needed Q-damping circuit resistance.

20. The nuclear quadrupole resonance detection system of claim 19, wherein the resistance is from about 100 to about 800 ohms.

21. The nuclear quadrupole resonance detection system of claim 20, wherein the resistance is from about 500 ohms to about 650 ohms.

22. The nuclear quadrupole resonance detection system of any of claims 19-21, further comprising a single loop or coil to inductively couple the Q-damping circuit to the high temperature superconductor self-resonant receive coil.

23. The nuclear quadrupole resonance detection system of claim 22, wherein the single loop or coil comprises a high temperature superconductor.

24. The nuclear quadrupole resonance detection system of claim 22, wherein the single loop or coil is copper.

25. The nuclear quadrupole resonance detection system of any of claims 19-21, further comprising a high temperature superconductor single loop to inductively couple the Q-damping circuit to the high temperature superconductor self-resonant receive coil.

26. The nuclear quadrupole resonance detection system of any of claims 19-21, further comprising a copper single loop to inductively couple the Q-damping circuit to the high temperature superconductor self-resonant receive coil.

27. The nuclear quadrupole resonance detection system of any of claims 19-21, wherein the Q-damping circuit further comprises a capacitor and an inductor.