Measuring and testing – Speed – velocity – or acceleration – Acceleration determination utilizing inertial element
Patent
1979-04-11
1981-01-20
Gill, James J.
Measuring and testing
Speed, velocity, or acceleration
Acceleration determination utilizing inertial element
73382R, G01P 1508
Patent
active
042455103
ABSTRACT:
A portable accelerometer unit is described for measuring deviations or excursions from a datum due to an applied load or force. The portable accelerometer unit includes an accelerometer device mounted by suspension means in a housing, and is operable to generate an output signal in response to the applied load. An electrical circuit is also provided connectible to the accelerometer device to receive the output signal therefrom. This circuit includes at least one operational amplifier stage containing an operational amplifier. This amplifier has two input terminals and an output terminal. One of the input terminals is connected through a first variable resistance to a power supply. The other input terminal is connected to the accelerometer to receive the output signal therefrom. This other input terminal also has a feedback circuit operatively connected to it. The feedback circuit is controlled by a second variable resistance, whereby to effect zeroing of an accelerometer output signal due to gravity. An output device in the form of a meter, strip chart recorder or the like is driven from the output terminal to provide a readout of the applied load. A more preferred form of accelerometer unit includes a second operational amplifier stage to provide for isolation of the output device from the accelerometer device. In a still more preferred form, the portable accelerometer unit includes a third operational amplifier stage. The third operational amplifier has a feedback circuit connected between an input terminal and its output terminal, controlled by a variable resistance. This provides sensitivity control of the output signal.
REFERENCES:
patent: 3455148 (1969-07-01), Foster et al.
patent: 4079804 (1978-03-01), Paillard
patent: 4091356 (1978-05-01), Histchins
Gill James J.
Her Majesty the Queen in right of Canada as represented by the
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