Charged mass thin film condenser accelerometer

Details Charged mass thin film condenser accelerometer Charged mass thin film condenser accelerometer

1995-12-22

1998-01-20

Chapman, John E.

Measuring and testing

Speed, velocity, or acceleration

Acceleration determination utilizing inertial element

361280, G01P 15125

Patent

active

057103763

ABSTRACT:
An accelerometer having a pair of spaced apart planar electrodes in a housing wherein one of the planar electrodes is made of a thin film and has a mass attached to one side such that acceleration causes the thin film to flex. A solid state amplifier is located in the housing attached to one of the planar electrodes to measure the change in capacitance caused by the flexing of the thin film. The solid state amplifier may be an NPN transistor. The mass may be a 4.5 mm steel airgun shot, and the thin film may be 1 mil polyester aluminized metallic film. The output of the accelerometer is connected to one input of a operational amplifier, and the other input of the operational amplifier is connected to a transducer measuring ambient noise such that the ambient noise is removed from the signal from the accelerometer.

REFERENCES:
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patent: 3742767 (1973-07-01), Bernard et al.
patent: 4516428 (1985-05-01), Kanomi
patent: 4583404 (1986-04-01), Bernard et al.
patent: 5092174 (1992-03-01), Reidemeister et al.
patent: 5103667 (1992-04-01), Allen et al.
patent: 5117694 (1992-06-01), Okumura

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