Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1987-03-23
1988-03-15
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310323, 310324, 310328, H01L 4108
Patent
active
047315563
ABSTRACT:
An oscillator utilizes a piezo-electric transducer as a frequency determining element. The transducer, when unloaded, has a resonant frequency which determines the oscillation frequency and exhibits a pretermined level of amplitude excursion. A clamping mechanism detachably couples the transducer into engagement with a conduit through which fluid flows. This action increases the loading of the transducer and produces a change of resonant frequency, causing the oscillator frequency to change, and also causing the level of amplitude excursion to change. The amount of oscillator frequency change and the change in excursion level have respective values when the fluid flowing in the conduit past the transducer is bubble free which differ from the respective values when the fluid contains bubbles. Circuitry responsive to the changing amplitude values produces an output signal when a selected one of the bubble free and bubble containing conditions is detected. Apparatus responsive to the output signal produces a visual equivalent thereof.
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