Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1978-02-17
1979-12-11
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310329, H01L 4110
Patent
active
041785258
ABSTRACT:
There is disclosed a transmitter for detecting and transmitting peak amplitudes of a cyclic voltage developed by a transducer responsive to vibration. The transmitter includes an input amplifier receiving the transducer output signal in circuit to a voltage peak detector which generates a voltage signal responsive to the peak of the amplified transducer signal, a voltage peak integrator which develops an analog output voltage signal responsive to a predetermined, stored number of pulses of the pulse voltage signal and output amplifier which generates an output current signal proportional to the summed pulses of the voltage signal. The transmitter operates at a steady current drain of a few milliamperes and develops an output current signal in the 4-20 milliampere range whereby it can be directly coupled to most electrical instrumentation. The vibration transducer which is employed is preferably a piezoelectric crystal having an integrated preamplifier circuit which is powered by a constant current source supply included in the transmitter circuits.
REFERENCES:
patent: Re28596 (1975-10-01), Siegel
patent: 3213197 (1965-10-01), Hawkins
patent: 3390286 (1968-06-01), Gradin et al.
patent: 3455148 (1969-07-01), Foster et al.
patent: 3455149 (1969-07-01), Foster et al.
patent: 3749946 (1973-07-01), Ruti
patent: 4085349 (1978-04-01), Farstad
Budd Mark O.
Robertshaw Controls Company
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