G - Physics – 01 – P
Patent
G - Physics
01
P
354/32, 73/42
G01P 7/00 (2006.01) G01P 15/097 (2006.01) G01P 15/10 (2006.01)
Patent
CA 1295049
VIBRATING BEAM ACCELEROMETER WITH VELOCITY CHANGE OUTPUT Abstract A dual sensor, frequency output accelerometer that does not require either high sampling rates or mechanical matching of the sensors to achieve high levels of accuracy. In one embodiment, the accelerometer comprises a first sensor (12, 14, 16) that produces an output signal S1 having afrequency f1 related to acceleration along the sensitive axis, and a second sensor (18, 20, 22) that produces a second signal S2 having a frequency f2 related to acceleration along the sensitive axis, the sensors being arranged such that a given acceleration causes the frequency of one output signal to increase and thefrequency of the other output signal to decrease. Velocity change .DELTA.V during time interval T is determined according to: Image where A, F and B are constants, .DELTA..PHI. is the difference between the phase chnnges of the output signals over time interval T, and .SIGMA..PHI. is the sum of the phase changes of the output signals over time interval T. Higher order correction terms are also described for very high precision applications. Also disclosed isan accelerometer for measuring velocity change during a time interval that includes a subinterval during which electrical power is unavailable.
520905
Peters Rex B.
Riches Mckenzie & Herbert Llp
Sundstrand Corporation
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