US4467651A
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Method for determining acceleration
Assignee: Honeywell International Inc
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Filing: 1983-01-06
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Granted: 1984-08-28
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Expires: 2003-01-06
Abstract
Abstract An accelerometer has two proof masses each constrained from movement by a beam resonant force transducer. The proof mass-force transducer systems are mounted with the sensitive axes of the proof masses aligned and the force transducers arranged so that their resonant frequencies f 1 and f 2 vary oppositely with a change in acceleration. The acceleration is determined in accordance with the relation a=A.sub.1 f.sub.1 -A.sub.2 f.sub.3 +A.sub.0 or a=A.sub.1 f.sub.1.sup.2 -A.sub.2 f.sub.2.sup.2 +A.sub.0 where a is the acceleration and A 1 , A 2 and A 0 are calibration coefficients.
Inventors
- 👤 Rex B. Peters
- 👤 Arnold Malametz
- 👤 Jeffrey F. Tonn
- 👤 Charles K. Lee
- 👤 Aleksandar M. Gogic
- 👤 Victor B. Corey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:44
CPC Classifications
G; G01; G01P; G01P15/00; G01P15/02; G01P15/08; G01P15/097; Y; Y10; Y10S; Y10S73/00; Y10S73/01
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
88 words
In an accelerometer having dual proof masses sensitive to the same acceleration, with a pair of beam resonant force transducers, one connected with each proof mass for sensing the force induced in the proof mass by acceleration, the transducers having resonant frequencies f 1 and f 2 which vary oppositely with a change in acceleration, the improved method of determining the acceleration from the transducer frequencies in accordance with the relation a=A.sub.1 f.sub.1 -A.sub.2 f.sub.2 +A.sub.0, where A 1 , A 2 and A 0 are calibration coefficients.
Claim 2
Dependent Claim
88 words
In an accelerometer having dual proof masses sensitive to the same acceleration, with a pair of beam resonant force transducers, one connected with each proof mass for sensing the force induced in the proof mass by acceleration, the transducers having resonant frequencies f 1 and f 2 which vary oppositely with a change in acceleration, the improved method of determining the acceleration from the transducer frequencies in accordance with the relation a=A.sub.1 f.sub.1 -A.sub.2 f.sub.2 +A.sub.0, where A 1 , A 2 and A 0 are calibration coefficients.
Claim 3
Dependent Claim
88 words
In an accelerometer having dual proof masses sensitive to the same acceleration, with a pair of beam resonant force transducers, one connected with each proof mass for sensing the force induced in the proof mass by acceleration, the transducers having resonant frequencies f 1 , f 2 which vary oppositely with a change in acceleration, the improved method of determining the acceleration from the transducer frequencies in accordance with the relation a=A.sub.1 f.sub.1.sup.2 -A.sub.2 f.sub.2.sup.2 +A.sub.0, where A 1 , A 2 and A 0 are calibration coefficients.
Claim 4
Dependent Claim
88 words
In an accelerometer having dual proof masses sensitive to the same acceleration, with a pair of beam resonant force transducers, one connected with each proof mass for sensing the force induced in the proof mass by acceleration, the transducers having resonant frequencies f 1 , f 2 which vary oppositely with a change in acceleration, the improved method of determining the acceleration from the transducer frequencies in accordance with the relation a=A.sub.1 f.sub.1.sup.2 -A.sub.2 f.sub.2.sup.2 +A.sub.0, where A 1 , A 2 and A 0 are calibration coefficients.
Claim 5
Dependent Claim
32 words
The method of claim 2 in which the calibration coefficients are determined for the best approximation of acceleration over the full input range and over the operating temperature range of the accelerometer.
Claim 6
Dependent Claim
39 words
The method of claim 3 in which the accelerometer is calibrated at discrete temperatures T j and the calibration coefficients are represented as a matrix of coefficients {A.sub.ij }; j=1, 2, 3, . . . ; i=1, 2, 0.
Claim 7
Dependent Claim
25 words
The method of claim 4 in which each coefficient A i is modeled with a least-squares-fit polynomial function with respect to temperature, represented by ##EQU2##
Claim 8
Dependent Claim
30 words
The method of claim 2 in which the caibration coeffficients are determined for a minimum value of the derivative of acceleration with respect to temperatures, (da/dT), where T is temperature.
References Cited (Backward Citations)
US3479536A
Cited
US4155257A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-08-28 | 1988-02-27 | 1988-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-28 | 1992-02-27 | 1992-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-28 | 1996-02-27 | 1996-08-28 | $7700.00 | Window Closed / Lapsed |