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US5621171A
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Method for actively balancing a vibration structure gyroscope sensing element structure
Assignee: BAE Systems PLC
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Filing: 1996-04-05
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Granted: 1997-04-15
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Expires: 2016-04-05
Abstract
Abstract A vibrating structure gyroscope sensing element structure of ring-like or substantially cylindrical form made of ferromagnetic material is actively balanced by applying a variable strength magnetic field across a predetermined section of the circumference of the sensing element structure differentially to shift the resonant frequency of one or the other of the primary and secondary vibration modes (1,2) thereof by an amount sufficient to bring the two mode resonant frequencies into balance.
Inventors
- 👤 Christopher Fell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:49
CPC Classifications
G; G01; G01C; G01C19/00; G01C19/56; G01C19/567
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
75 words
A method for actively balancing a Vibrating Structure Gyroscope sensing element structure of ring-like or substantially cylindrical form made of ferromagnetic material, in which a variable strength magnetic field is applied across a predetermined section of the circumference of the sensing element structure differentially to shift the resonant frequency of one or the other of the primary and secondary vibration modes thereof by an amount sufficient to bring the two mode resonant frequencies into balance.
Claim 2
Independent Claim
75 words
A method for actively balancing a Vibrating Structure Gyroscope sensing element structure of ring-like or substantially cylindrical form made of ferromagnetic material, in which a variable strength magnetic field is applied across a predetermined section of the circumference of the sensing element structure differentially to shift the resonant frequency of one or the other of the primary and secondary vibration modes thereof by an amount sufficient to bring the two mode resonant frequencies into balance.
Claim 3
Dependent Claim
16 words
Method according to claim 1 in which the magnetic field is applied to the primary mode.
Claim 4
Dependent Claim
24 words
Method according to claim 2, in which the magnetic field applied reduces the mode resonant frequency of vibration in proportion to the field strength.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-04-14 | 2000-10-14 | 2001-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-04-14 | 2004-10-14 | 2005-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-04-14 | 2008-10-14 | 2009-04-15 | $7700.00 | Window Closed / Lapsed |