US4479385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double resonator cantilever accelerometer
Assignee: United States Department of Energy
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Filing: 1982-09-23
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Granted: 1984-10-30
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Expires: 2002-09-23
Abstract
Abstract A digital quartz accelerometer includes a pair of spaced double-ended tuning forks fastened at one end to a base and at the other end through a spacer mass. Transverse movement of the resonator members stresses one and compresses the other, providing a differential frequency output which is indicative of acceleration.
Inventors
- 👤 Dale R. Koehler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:34
CPC Classifications
G; G01; G01P; G01P15/00; G01P15/02; G01P15/08; Y; Y10; Y10S; Y10S73/00; Y10S73/01
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
128 words
An accelerator comprising a base and a first free-standing acceleration sensitive resonator affixed to said base, said resonator consisting of: a resonator mass; a first elongate piezoelectric quartz force transducer having one end rigidly fastened to said base and an opposed end rigidly fastened to said mass; a second substantially identical transducer having one end rigidly fastened to said base and an opposed end rigidly fastened to said mass, each of said ends being spaced from a respective end of said first transducer; each of said transducers comprising a rectangular beam having a length greater than its width and a width greater than its thickness, said first transducer having a face in the length-width plane which is spaced from and opposing an equivalent face of said second transducer.
Claim 2
Dependent Claim
128 words
An accelerator comprising a base and a first free-standing acceleration sensitive resonator affixed to said base, said resonator consisting of: a resonator mass; a first elongate piezoelectric quartz force transducer having one end rigidly fastened to said base and an opposed end rigidly fastened to said mass; a second substantially identical transducer having one end rigidly fastened to said base and an opposed end rigidly fastened to said mass, each of said ends being spaced from a respective end of said first transducer; each of said transducers comprising a rectangular beam having a length greater than its width and a width greater than its thickness, said first transducer having a face in the length-width plane which is spaced from and opposing an equivalent face of said second transducer.
Claim 3
Dependent Claim
15 words
The accelerometer of claim 1 wherein said first transducer is parallel to said second transducer.
Claim 4
Dependent Claim
11 words
The accelerometer of claim 1 wherein said opposing beams are aligned.
Claim 5
Dependent Claim
11 words
The accelerometer of claim 3 wherein said opposing beams are parallel.
Claim 6
Dependent Claim
15 words
The accelerometer of claim 4 wherein each of said beams comprises a double-ended tuning fork.
Claim 7
Dependent Claim
38 words
The accelerometer of claim 1 further comprising an identical free-standing acceleration sensitive resonator identical to said first resonator and affixed to said base, said second resonator extending in a direction perpendicular to the axis of said first resonator.
Claim 8
Dependent Claim
124 words
An accelerometer comprising a base and a first free-standing acceleration sensitive resonator affixed to said base, said resonator consisting of: a resonator mass; a first elongate resonating member having one end rigidly fastened to said base and an opposed end rigidly fastened to said mass; an inactive, substantially identical member having one end rigidly fastened to said base and an opposed end rigidily fastened to said mass, each of said ends being spaced from a respective end of said first member; and a second resonating member substantially identical to said first resonating member, said second resonating member having one end rigidly fastened to said base and an opposed end free-standing, said second resonating member providing a temperature compensation signal for said first resonating member.
Claim 9
Dependent Claim
124 words
An accelerometer comprising a base and a first free-standing acceleration sensitive resonator affixed to said base, said resonator consisting of: a resonator mass; a first elongate resonating member having one end rigidly fastened to said base and an opposed end rigidly fastened to said mass; an inactive, substantially identical member having one end rigidly fastened to said base and an opposed end rigidily fastened to said mass, each of said ends being spaced from a respective end of said first member; and a second resonating member substantially identical to said first resonating member, said second resonating member having one end rigidly fastened to said base and an opposed end free-standing, said second resonating member providing a temperature compensation signal for said first resonating member.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-30 | 1988-04-30 | 1988-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-30 | 1992-04-30 | 1992-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-30 | 1996-04-30 | 1996-10-30 | $7700.00 | Window Closed / Lapsed |