Claims
- 1. An electron spin resonance system, comprising:
- a magnetic circuit in which each permanent magnet, including a magnetic pole piece on the surface thereof, of a pair of permanent magnets is respectively attached to an opposing surface of a stationary yoke of a pair of stationary yokes mounted opposite to each other to form a gap, a movable yoke mounted for continuously changing the distance between opposing surfaces of the stationary yokes, so that the magnetic resistance of a magnetic path formed by said permanent magnets, stationary yokes and movable yokes is continuously modulated, thereby forming a continuously modulated magnetic field in the gap between the opposed permanent magnets;
- coils for applying a modulating magnetic field to said gap and a sweeping magnetic field application coil for applying a sweeping magnetic field to said gap;
- a cavity resonator disposed in said gap for receiving specimens to be measured; and
- a microwave generator and a microwave detector attached to the outside of said cavity resonator.
- 2. An electron spin resonance system as defined in claim 1, wherein the modulating magnetic field application coil are disposed around the periphery of the magnetic pole piece or the permanent magnet.
- 3. An electron spin resonance system as defined in claim 1, wherein the modulating magnetic field application coils are disposed around the periphery of the movable yoke.
- 4. An electron spin resonance system as defined in claim 1, wherein the sweeping magnetic field application coils are disposed around the periphery of the magnetic pole piece or the permanent magnet.
- 5. An electron spin resonance system as defined in claim 1, wherein the sweeping magnetic field application coils are disposed around the periphery of the movable yoke.
- 6. An electron spin resonance system as defined in claim 2, further comprising an AC power source means capable of supplying an AC current to the modulating magnetic field application coil and a display means for outputting the microwave detected signal upon application of the modulating magnetic field is outputted to an oscilloscope.
- 7. An electron spin resonance system as defined in claim 5, further comprising a DC power source means capable of supplying a DC current to the sweeping magnetic field application coil and a display means capable of outputting a microwave detected signal upon application of the sweeping magnetic field to the x-y recorder.
- 8. An electron spin resonance system as defined in claim 2, further comprising a lock-in amplifier for improving the sensitivity by stepping up the detected signal voltage.
- 9. An electron spin resonance system as defined in claim 1, wherein a microwave circuit comprises a microwave generator and a microwave detector integrated into a module.
- 10. An electron spin resonance system as defined in claim 9, wherein a microwave Doppler sensor using a Gunn diode is the microwave circuit.
- 11. An electron spin resonance system as defined in claim 1, wherein the cavity resonator is a TE.sub.102 mode rectangular cavity resonator.
- 12. An electron spin resonance system as defined in claim 1, wherein the permanent magnet comprises an Fe-B-R series permanent magnet.
- 13. An electron spin resonance system as defined in claim 1, wherein the movable yoke comprises a bolt member forwarded and backwarded by a screw coupling passing through the stationary yoke.
- 14. An electron spin resonance system as defined in claim 13, wherein the bolt member comprises a plurality of bolt members disposed coaxially.
- 15. An electron spin resonance system as defined in claim 14, wherein the bolt member comprises a coarsely movable screwed bolt of a greater diameter and a fine movable screwed bolt of a smaller diameter.
- 16. An electron spin resonance system as defined in claim 1, wherein the movable yoke is disposed at one of the pair of yokes and the stationary yoke is disposed at another of the pair of yokes.
- 17. An electron spin resonance system as defined in claim 1, wherein the movable yoke is disposed at each one of the pair of yokes.
- 18. An electron spin resonance system as defined in claim 3, wherein an AC power source means capable of supplying an AC current to the modulating magnetic field application coil and a display means for outputting the microwave detected signal upon application of the modulating magnetic field is outputted to an oscilloscope.
- 19. An electron spin resonance system as defined in claim 4, wherein a DC power source means capable of supplying a DC current to the sweeping magnetic field application coil and a display means capable of outputting a microwave detected signal upon application of the sweeping magnetic field to the X-Y recorder are disposed.
- 20. An electron spin resonance system, comprising:
- a magnetic circuit in which each permanent magnet, including a magnetic pole piece on the surface thereof, of a pair of permanent magnets is respectively attached to an opposing surface of a stationary yoke of a pair of stationary yokes are mounted opposite to each other to form a gap, a movable yoke mounted for continuously changing the distance between opposing surfaces of the stationary yokes, so that the magnetic resistance of a magnetic path formed by said permanent magnets, stationary yokes and movable yokes is continuously modulated, thereby forming a continuously modulated magnetic field in the gap between the opposed permanent magnets;
- coils for applying a modulating magnetic field to said gap or a sweeping magnetic field application coil for applying a sweeping magnetic field to said gap;
- a cavity resonator disposed in said gap for receiving specimens to be measured; and
- a microwave generator and a microwave detector attached to the outside of said cavity resonator.
- 21. An electron spin resonance system as defined in claim 20, wherein the modulating magnetic field application coil is disposed around the periphery of the magnetic pole piece or the permanent magnet.
- 22. An electron spin resonance system as defined in claim 20, wherein the modulating magnetic field application coil is disposed around the periphery of the movable yoke.
- 23. An electron spin resonance system as defined in claim 20, wherein the sweeping magnetic field application coils are disposed around the periphery of the magnetic pole piece or the permanent magnet.
- 24. An electron spin resonance system as defined in claim 20, wherein the sweeping magnetic field application coils are disposed around the periphery of the movable yoke.
- 25. An electron spin resonance system as defined in claim 21, wherein an AC power source means capable of supplying an AC current to the modulating magnetic field application coil is disposed and a display means for outputting the microwave detected signal upon application of the modulating magnetic field is outputted to an oscilloscope.
- 26. An electron spin resonance system as defined in claim 25, further comprising a DC power source means capable of supplying a DC current to the sweeping magnetic field application coil and a display means capable of outputting a microwave detected signal upon application of the sweeping magnetic field to the x-y recorder.
- 27. An electron spin resonance system as defined in claim 20, wherein a microwave circuit comprises a microwave generator and a microwave detector integrated into a module.
- 28. An electron spin resonance system as defined in claim 27, wherein a microwave Doppler sensor using a Gunn diode is the microwave circuit.
- 29. An electron spin resonance system as defined in claim 20, wherein the cavity resonator is a TE.sub.102 mode rectangular cavity resonator.
- 30. An electron spin resonance system as defined in claim 20, wherein the permanent magnet comprises an Fe-B-R series permanent magnet.
- 31. An electron spin resonance system as defined in claim 20, wherein the movable yoke comprises a bolt member forwarded and backwarded by a screw coupling passing through the stationary yoke.
- 32. An electron spin resonance system as defined in claim 31, wherein the bolt member comprises a plurality of bolt members disposed coaxially.
- 33. An electron spin resonance system as defined in claim 32, wherein the bolt member comprises a coarsely movable screwed bolt of a greater diameter and a fine movable screwed bolt of a smaller diameter.
- 34. An electron spin resonance system as defined in claim 20, wherein the movable yoke is disposed at one of the pair of yokes and the stationary yoke is disposed at another of the pair of yokes.
- 35. An electron spin resonance system as defined in claim 20, wherein the movable yoke is disposed at each one of the pair of yokes.
- 36. An electron spin resonance system as defined in claim 22, wherein an AC power source means capable of supplying an AC current to the modulating magnetic field application coil and a display means for outputting the microwave detected signal upon application of the modulating magnetic field is outputted to an oscilloscope.
- 37. An electron spin resonance system as defined in claim 23, wherein a DC power source means capable of supplying a DC current to the sweeping magnetic field application coil and a display means capable of outputting a microwave detected signal upon application of the sweeping magnetic field to the X-Y recorder are disposed.
Priority Claims (1)
Number |
Date |
Country |
Kind |
1-263328 |
Oct 1989 |
JPX |
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Parent Case Info
This application is a continuation of Ser. No. 555,593, filed Jul. 23, 1990, now U.S. Pat. No. 5,142,232, issued Aug. 25, 1992.
US Referenced Citations (6)
Continuations (1)
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Number |
Date |
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Parent |
555593 |
Jul 1990 |
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