Self-compensating accelerometer

Details Self-compensating accelerometer Self-compensating accelerometer

1991-10-10

1992-11-17

Chapman, John E.

Measuring and testing

Speed, velocity, or acceleration

Acceleration determination utilizing inertial element

G01P 1512

Patent

active

051633256

ABSTRACT:
An acceleration sensor having a sensing mass supported relative to a frame by a plurality of beams having a plurality of resistors integral therewith. The resistance of the beam resistors varies as the sensing mass is displaced relative to the frame in response to acceleration of the frame in a direction generally normal to the plane of beam extension. The displacement of the sensing mass due to such acceleration produces a corresponding change in the output of a Wheatstone bridge incorporating the beam resistors in the legs thereof. At least one leg of the bridge additionally has a resistor of variable resistance in series with the beam resistor thereof, the resistance of which is controlled by a microprocessor, whereby the range of bridge outputs is adjusted to initially compensate for manufacturing tolerances and thereafter compensate for temperature effects and component aging. The resistance is varied by way of the microprocessor switching fixed resistors in paarallel connection with the leg of the bridge.

REFERENCES:
patent: 4869107 (1989-09-01), Murakami
Beckwith et al., Mechanical Measurements. Reading, Mass., Addison-Wesley, 1961, pp. 134-141. TJ 148 B4.

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