Closed loop temperature compensation for accelerometer current s

Details Closed loop temperature compensation for accelerometer current s Closed loop temperature compensation for accelerometer current s

1991-07-31

1993-06-22

Chapman, John E.

Measuring and testing

Speed, velocity, or acceleration

Temperature compensator

73517B, G01P 1513

Patent

active

052208311

ABSTRACT:
A temperature compensation system for a force balance accelerometer is disposed within a feedback loop. A series resistor (82) is connected in series with torque coils (30,80). Connected in parallel with the torque coils and the series resistor (82) is a parallel resistor (84) having a positive resistive temperature coefficient. Series resistor (82) and parallel resistor (84) are placed in close thermal communication with torque coil (30) and a magnetic circuit that includes stators (10 and 12) and permanent magnets (14). As the temperature of the accelerometer increases, less current flows through parallel resistor (84) and more current flows through the torque coil (30), thereby compensating for a reduced torque constant of torque coil that decreases with temperature, yet, enabling the resulting output current, I.sub.o, to remain constant (for a given acceleration).

REFERENCES:
patent: 3030814 (1962-04-01), Ainsworth
patent: 3708754 (1973-01-01), Diehl
patent: 4128010 (1978-12-01), Aske
patent: 4144764 (1979-03-01), Hartzell, Jr.
patent: 4336718 (1982-06-01), Washburn
patent: 4430894 (1984-02-01), Albert et al.
patent: 4694696 (1987-09-01), Hojo et al.
patent: 4697455 (1987-10-01), Norling
patent: 4887467 (1989-12-01), Sakuma et al.

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