| 摘要 |
A force rebalance accelerometer ( 20 ) includes a silicon dioxide-based proof mass ( 28 ) having capacitive elements ( 40 ) engaged with excitation rings ( 61 ) made from alloys of Super Invar. The magnet assembly ( 60 ) includes an excitation ring ( 61 ), a magnet ( 63 ), and a pole piece ( 65 ). The Super Invar of the excitation rings ( 61 ) substantially matches the coefficient of thermal expansion of the silicon dioxide-based proof mass ( 28 ) to substantially reduce distortion signals caused by temperature changes. Movement of the accelerometer causes the capacitive elements ( 40 ) to produce a signal proportional to the movement acceleration and not by temperature changes experienced by the accelerometer.
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