Adjustment of scale factor linearity in a servo accelerometer

Details Adjustment of scale factor linearity in a servo accelerometer Adjustment of scale factor linearity in a servo accelerometer

1990-05-18

1992-07-28

Williams, Hezron E.

Measuring and testing

Speed, velocity, or acceleration

Acceleration determination utilizing inertial element

73517R, 73 1D, G01P 1508

Patent

active

051332140

ABSTRACT:
A method for post-production reduction of scale factor nonlinearities including testing of an assembled torque coil and magnetic circuit to determine nonlinearities. To reduce the scale factor nonlinearities, the position of a magnetic circuit component which intercepts the magnetic flux passing through a torque coil is changed. The position of the interior surface of a magnetic end cap is changed with respect to the position of the torque coil. The location of the interior surface of the end cap is varied by using an end cap having a plug portion which is selected to have an interior surface at a location which minimizes scale factor nonlinearities.
An force-balance accelerometer has an improved magnetic circuit for reducing nonlinear scale factors. The magnetic circuit which provides a return path for magnetic flux from a permanent magnet source includes an end cap having an interior surface which is located at an optimum distance from the torque coil of the accelerometer to minimize scale factor distortion. The end cap includes a plug member having a predetermined reference surface for engagement with a reference surface in the end cap to locate the interior surface of the plug at an optimum position.

REFERENCES:
patent: 4088026 (1978-05-01), Flanner
patent: 4854169 (1989-08-01), Sakuma et al.

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