Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Demand – excess – maximum or minimum
Patent
1992-09-30
1995-04-11
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Demand, excess, maximum or minimum
324 72, G01R 1904
Patent
active
054061962
ABSTRACT:
A maximum voltage detecting apparatus for measuring the output maximum voltage, such as of an optical sensor, a thermal sensor or a wind sensor, utilizing a ferroelectric substance. A d.c. power source of a reset circuit applies a d.c. voltage to a ferroelectric device to generate a maximum spontaneous polarization, the ferroelectric device including metal electrodes and a PZT ferroelectric substance held therebetween. The output voltage such as from the wind sensor is applied to the ferroelectric device so as to have an opposite polarity. A polarization measuring circuit measures a residual polarization in the ferroelectric device by this output voltage and measures a maximum output voltage value from the residual polarization value.
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Karlsen Ernest F.
Rohm & Co., Ltd.
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