Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1986-10-14
1987-08-04
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
73700, 73754, H01L 4108
Patent
active
046848428
ABSTRACT:
A gas pressure transducer has a voltage stabilizer for supplying a piezoelectric crystal in a gas with an AC constant-voltage signal corresponding to an applied AC signal and having a constant peak amplitude. An alternating output current from the piezoelectric crystal is converted by a current-to-voltage converter into an AC voltage, which is shifted in phase by a phase shifter so that the impedance of the piezoelectric crystal is minimal or nearly minimal under the resonant condition. The shifted AC voltage is then applied to the voltage stabilizer. The piezoelectric crystal, the voltage stabilizer, the current-to-voltage converter, and the phase shifter jointly constitute a self-excited oscillation loop. Since the amplitude of the AC voltage from the current-to-voltage converter is uniquely dependent on the pressure of the gas, the gas pressure can be known from a DC voltage produced by rectifying the AC voltage.
REFERENCES:
patent: 3432691 (1969-03-01), Shoh
patent: 3447051 (1969-05-01), Attwood et al.
patent: 3586936 (1971-06-01), McLeroy
patent: 3819961 (1974-06-01), Bourgeois et al.
patent: 3967143 (1976-06-01), Watanabe et al.
patent: 4302728 (1981-11-01), Nakamura
patent: 4468581 (1984-08-01), Okada et al.
Ultrasonic Pressure & Frequency Analyzer, by Modlo and Moore, IBM Technical Disclosure Bulletin, vol. 14, No. 3, Aug. 1971, pp. 850-851.
Abe Masakazu
Maruno Naohiko
Ogawa Tetsuo
Budd Mark O.
Nagano Keiki Seisakusho, Ltd.
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