Measuring and testing – Speed – velocity – or acceleration – Acceleration determination utilizing inertial element
Patent
1983-01-31
1984-07-17
Gill, James J.
Measuring and testing
Speed, velocity, or acceleration
Acceleration determination utilizing inertial element
G01P 1513
Patent
active
044598491
ABSTRACT:
A force measuring system is provided in which a force sensitive element (51) includes a movable capacitor plate (21) located between two fixed capacitor plates (19, 20). A pair of jewel bearings (52) are mounted to a support casting (55) and provides support for a force sensitive element (51). The support casting (55) also serves as a support for a hybrid integrated circuit (68) which, in turn, forms a support substrate for one of the fixed plates (19). A second fixed plate (20) may be mounted on the casting (55) via a substrate (69). The hybrid integrated circuit (68) is therefore in close proximity to a capacitor element (19-21). The hybrid circuit (68) provides output power to a torquer coil (37) which centers the force sensitive element (51), with current provided to the torquer coil (37) being indicative of force exerted on the force sensitive element (51).
The hybrid circuit is designed so that a power amplifier circuit can be added in order to provide additional current to the torquer coil (37) at relatively high measured forces. The power amplifier has little effect on output current at moderate force levels, and therefore the inclusion of the power amplifier on the hybrid circuit is optional, with the hybrid circuit being operable without the power amplifier.
The system exhibits a high degree of structural stability while being compact in size.
REFERENCES:
patent: 4080835 (1978-03-01), Marques
patent: 4131020 (1978-12-01), Hugli et al.
patent: 4169384 (1979-10-01), Flanner et al.
Gill James J.
Protigal Stanley N.
The Bendix Corporation
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