UPPBERNINGSANORDNING FOR EN ACCELEROMETER

摘要

A one-piece support frame is used to support a pair of capacitor plates and a lightweight longitudinally reinforced pendulum having a paddle on one end. The paddle is positioned midway between the capacitor plates forming a pair of capacitors. Attached to the pendulum is an axle which in turn is supported between two flexures by means of jeweled pivoted bearings. The ends of the flexures are rigidly secured to the support frame, and a desired pressure of the bearings against the axle is maintained by means of adjustment screws. Also attached to the pendulum is a torque coil which interacts with a magnetic assembly, secured to the support frame, to restore the paddle to the midpoint between the capacitor plates when the pendulum has been subjected to an acceleration force. Secured to the support frame above and parallel to the pendulum is a thick film circuit board containing an integrated circuit and associated hybrid elements for applying time varying voltages to each capacitor so that the currents flowing through the capacitors can be used as a measure of the difference in capacitance due to deflection of the paddle. The circuitry also includes an output circuit having a servo-compensated network for applying a restoring current to the torque coil wherein the gain and frequency characteristics of the servo system are independent of an impedance used to measure the restoring current.