Measuring and testing – Speed – velocity – or acceleration – Acceleration determination utilizing inertial element
Patent
1995-12-20
1997-03-18
Williams, Hezron E.
Measuring and testing
Speed, velocity, or acceleration
Acceleration determination utilizing inertial element
7351418, G01D 15125
Patent
active
056124945
ABSTRACT:
A capacitance-type electrostatic servo acceleration sensor capable of detecting applied acceleration with high sensitivity and with low error without needing an accurate oscillator. The sensor makes use of a PAM (pulse amplitude-modulation) circuit for performing pulse amplitude-modulation in proportion to the acceleration. The sensor is equipped with a capacitance-detecting portion having a movable electrode and a pair of fixed electrodes located on opposite sides of the movable electrode. The movable electrode is displaced in response to the acceleration. A comparator is formed by an operational amplifier, and a servomechanism is formed. The electrically obtained open gain of this operational amplifier is set sufficiently greater than the mechanically obtained gain of the capacitance-detecting portion. A measurement mode period and a force-balanced mode period are repeated alternately. During the measurement mode period, the movable electrode is not constrained by the servomechanism, and a voltage corresponding to the acceleration is applied to a sample-and-hold amplifier. During the force-balanced mode period, the movable electrode is constrained by the servomechanism according to the output from the sample-and-hold amplifier which corresponds to the acceleration, and the movable electrode is short-circuited to ground.
REFERENCES:
patent: 3911738 (1975-10-01), Fisher
patent: 4009607 (1977-03-01), Ficken
patent: 4102202 (1978-07-01), Ferriss
patent: 4345474 (1982-08-01), Deval
patent: 4584885 (1986-04-01), Cadwell
patent: 4932261 (1990-06-01), Henrion
patent: 5122755 (1992-06-01), Nootbaar et al.
patent: 5277053 (1994-01-01), McLane et al.
patent: 5325065 (1994-06-01), Bennett et al.
patent: 5343766 (1994-09-01), Lee
patent: 5428352 (1995-06-01), Bennett
patent: 5440939 (1995-08-01), Barney et al.
patent: 5454266 (1995-10-01), Chevroulet et al.
patent: 5465604 (1995-11-01), Sherman
patent: 5473946 (1995-12-01), Wyse et al.
patent: 5511420 (1996-04-01), Zhao et al.
Moller Richard A.
Murata Manufacturing Co. Ltd.
Williams Hezron E.
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