Claims
- 1. A method for monitoring an angular displacement in a rotation plane about a rotation axis and related displacement parameters of a moving part, comprising:
mounting at least one electrodynamic profile on the moving part; placing at least one resonator in proximity to said electrodynamic profile; exciting in said resonator an alternating electromagnetic field at a frequency at which the electromagnetic field penetrates into the electrodynamic profile; measuring the variation of the electromagnetic field parameters, caused by displacement of the electrodynamic profile, said exciting of said resonator is by an electromagnetic field in the form of at least one slowed electromagnetic wave [having energy distribution of the electric and magnetic fields in said electrodynamic profile suitable for the maximum influence of its movement]; and measuring of variation of the slowed electromagnetic wave parameters, and comparing said measured parameters.
- 2. The method of claim 1, wherein: the scalar angular displacement is measured.
- 3. The method according to claim 2, wherein: the scalar angular displacement exceeds 180°.
- 4. The method according to claim 2, wherein: the scalar measured angular displacement is continuous.
- 5. The method according to claim 2, wherein: at least two said resonators are placed in the rotation plane at the same distance from and diametrically opposed to the rotation axis, and
parameters of at least two slowed electromagnetic waves are measured and compared.
- 6. The method according to claim 1, wherein: there is included the step of converting results of said comparing into a representation of the angular displacement parameters.
- 7. The method according to claim 1, wherein: the angular displacement and its direction are monitored.
- 8. The method according claim 7, wherein:
at least two resonators are placed with an angle shift in the rotation plane at the same distance from said electrodynamic profile, and parameters of at least two said slowed electromagnetic waves are measured and compared.
- 9. The method according to claim 8, wherein:
said angular shift is equal to approximately 90°.
- 10. The method according to claim 8, wherein:
at least two said resonators are placed in the rotation plane at the same distance from and diametrically opposed to the rotation axis.
- 11. The method according to claim 7, wherein:
at least four said resonators are placed with 90° angular shift in the rotation plane at the same distance from said electrodynamic profile, and the slowed electromagnetic waves are excited in each of said resonators, the parameters of said slowed waves in each resonator are measured and compared.
- 12. The method according to claim 1, wherein:
said slowed electromagnetic wave is an in-phase type of wave.
- 13. The method according to claim 1, wherein:
said slowed electromagnetic wave is an anti-phase type of wave.
- 14. The method according to claim 1, wherein:
the one slowed electromagnetic wave is an anti-phase type of wave, the other is an in-phase type of wave.
- 15. The method according to claim 1, wherein:
the electric field of said slowed electromagnetic wave is presented nearby the electrodynamic profile by the zero space harmonic.
- 16. The method according to claim 1, wherein:
the magnetic field of said slowed electromagnetic wave is presented nearby said electrodynamic profile by the zero space harmonic.
- 17. The method according to claim 1, wherein:
the electric field of the slowed electromagnetic wave is presented nearby the electrodynamnic profile by the plus one, minus one space harmonics.
- 18. The method according to claim 1, wherein:
the magnetic field of the slowed electromagnetic wave is presented nearby the electrodynamic profile by the plus one, minus one space harmonics.
- 19. An apparatus for monitoring angular displacement in a rotation plane about a rotation axis of a moving part, comprising:
at least one electrodynamic profile 1 for electric and magnetic fields mounted on the moving part 2 the displacement of the part 2 which is to be monitored, at least one resonator 4 and a measuring circuit 6 including at least one frequency generator 7, at least one transducer 8 and a converter 9 converting electric signals into the parameter of angular displacement, said resonator including at least one section of a sensitive slow-wave structure set to distribute the components of an electric and magnetic fields in the electrodynamic profile; said sensitive slow-wave structure further including at least two conductors, at least one of said conductors being an impedance conductor facing said electrodynamic profile.
- 20. The apparatus according to claim 19, wherein:
said slow-wave structure is fashioned as a row of conducting members arranged in series in the direction of the slowed wave propagation and connected to one another with spacing.
- 21. The apparatus according to claim 19, wherein:
said slow-wave structure forming a quadripole multi-pole.
- 22. The apparatus according to claim 19, wherein:
said slow-wave structure forming a multi-pole.
- 23. The apparatus according to claim 22, wherein:
both ends of said multi-pole are connected one to another, said multi-pole forming a traveling wave resonator.
- 24. The apparatus according to claim 23, wherein:
said resonator is connected to the measuring circuit through one of said matching plugs.
- 25. The apparatus according to claim 22, wherein:
at least two of said conductors of said multi-pole are connected together on the end opposite to said matching plug.
- 26. An apparatus according to claim 22, wherein:
all conductors of said multi-pole are open ended on the end opposite to the said matching plug.
- 27. An apparatus according to claim 22, wherein:
at least two conductors of said multi-pole are terminated to a capacitor on the end opposite to the said matching plug.
- 28. An apparatus according to claim 22, wherein:
at least two conductors of said multi-pole are terminated to an inductor on the end opposite to the said matching plug.
- 29. An apparatus according to claim 22, wherein:
said multi-pole comprising at least two impedance conductors placed in parallel and configured as mirror images of one another turned through 180°.
- 30. The apparatus according to claim 29, wherein:
said impedance conductors are made as radial spirals with opposite directions of winding.
- 31. The apparatus according to claim 29, wherein:
said impedance conductors are made as meander lines shifted one to another in the direction of the rotation on T/2, where T is the average period of a meander line.
- 32. An apparatus according to claim 22, wherein:
said multi-pole comprises two identical impedance conductors placed in the same surface.
- 33. An apparatus according to claim 32, wherein:
said impedance conductors form an interdigital comb.
- 34. An apparatus according to claim 22, wherein:
each of said electrodynamic profiles forms a round body, said body facing said multipole, and electromagnetic property of said body alters in the azimuth direction.
- 35. An apparatus according to claim 34, wherein:
said body has the altering in the azimuth direction radius
- 36. An apparatus according to claim 34, wherein:
said body has the altering in the azimuth direction width.
- 37. An apparatus according to claim 34, wherein:
each of said electrodynamic profiles is formed by a conducting material.
- 38. An apparatus according to claim 34, wherein:
each of said electrodynamic profiles is formed by a dielectric material.
- 39. An apparatus according to claim 34, wherein:
each of said electrodynamic profiles is formed by a magnetic material.
- 40. An apparatus according to claim 34, wherein:
each of said electrodynamic profiles is formed by a metal coating on the dielectric ring.
- 41. An apparatus according to claim 40, wherein:
said metal coating forms a ring with alternating width.
- 42. An apparatus according to claim 40, wherein:
said metal coating forms a periodic in the azimuth direction row of conducting members, not connected one to another.
- 43. An apparatus according to claim 40, wherein:
said metal coating has a configuration of a meander line.
- 44. An apparatus according to claim 40, wherein:
said metal coating has a configuration of a regular comb.
- 45. An apparatus according to claim 40, wherein:
said metal coating has the form of a comb with inclined fingers.
- 46. An apparatus according to claim 22, wherein:
at least one surface of each of said electrodynamic profiles facing said multi-pole is placed perpendicularly to the rotation axis.
- 47. An apparatus according to claim 22, wherein:
at least one surface of each of said electrodynamic profiles facing said multi-pole is placed in parallel to the rotation axis.
- 48. An apparatus according to claim 19, wherein:
said impedance conductors are fashioned in the rotation plane.
- 49. An apparatus according to claim 19, wherein:
said impedance conductors are fashioned in the cylindrical surface with the axis coinciding with the rotation axis.
- 50. An apparatus according to claim 19, wherein:
said matching plug comprises at least one capacitor.
- 51. An apparatus according to claim 19, wherein:
said matching plug comprises at least one inductor.
- 52. An apparatus according to claim 19, wherein:
said matching plug includes a section of an additional two-conductor slow-wave structure.
- 53. An apparatus according to claim 52, wherein:
said additional slow-wave structure has the configuration of a coupled helix.
- 54. An apparatus according to claim 52, wherein:
said additional slow-wave structure has a wave impedance Z2 which differs from the wave impedance Z1 of said multi-pole by at least a factor of three.
- 55. An apparatus according to claim 19, wherein:
said resonator includes two said matching plugs connected to the measuring circuit in series.
- 56. An apparatus according to claim 19, wherein:
said resonator is connected to said measuring circuit through one of said matching plugs.
- 57. An apparatus according to claim 19, wherein:
at least one of said impedance conductors of said sensitive slow-wave structure has the configuration of a comb.
- 58. An apparatus according to claim 19, wherein:
at least one of said impedance conductors of said sensitive slow-wave structure has the configuration of a meander line.
- 59. An apparatus according to claim 19, wherein:
at least one of said impedance conductors of said sensitive slow-wave structure has the configuration of a radial spiral having a free outline with at least one axis of symmetry.
- 60. A method of claim 1, wherein said measuring step includes measuring of variation of the slowed electromagnetic wave parameters.
- 61. A method of claim 60, wherein said measuring step includes comparing said measured parameters.
- 62. A method according to claim 1, wherein said slowed electromagnetic wave has an energy distribution of the electric and magnetic fields in said electrodynamic profile suitable for the maximum influence of its movements.
- 63. An apparatus of claim 19, wherein said resonator includes at least one matching plug.
- 64. An apparatus of claim 63, wherein said section of a sensitive slow-wave structure is connected to said matching plug.
- 65. An apparatus of claim 19, wherein said measuring circuit includes at least one frequency generator.
- 66. An apparatus of claim 65, wherein said frequency generator is a radio frequency generator.
- 67. An apparatus of claim 19, wherein said measuring circuit includes a transducer and a converter.
- 68. An apparatus of claim 19, wherein said distribution by said sensitive slow-wave structure is in a given ratio.
- 69. An apparatus of claim 19, wherein:
said slow-wave structure forming a multi-pole.
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This is a continuation-in-part of U.S. patent application Ser. No. 09/134056, filed Aug. 14, 1998, by Pchelnikov et al., for Electromagnetic Method of Liquid Level Monitoring, and a division of U.S. patent application Ser. No. 09/379,840, filed Aug. 24, 1999.
Divisions (1)
|
Number |
Date |
Country |
Parent |
09379840 |
Aug 1999 |
US |
Child |
10155343 |
May 2002 |
US |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
09134056 |
Aug 1998 |
US |
Child |
10155343 |
May 2002 |
US |