G - Physics – 01 – P
Patent
G - Physics
01
P
73/42
G01P 15/08 (2006.01) G01P 15/135 (2006.01)
Patent
CA 1085645
ABSTRACT OF THE DISCLOSURE 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 pro- vided 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 opera- tional 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.
306930
Aspila Kalevi P.
Her Majesty The Queen In Right Of Canada As Represented By The M
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