Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
Patent
1990-09-19
1992-10-20
Nguyen, Vinh
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rotor
324 74, 324 96, G01R 1900
Patent
active
051573270
ABSTRACT:
A method and apparatus for measuring an electro-optic voltage signal generated in response to an applied voltage signal at a select dot contact of an electro-optic crystal. The applied voltage signal is time averaged along one path to generate an average reference voltage signal, and electro-optically measured along another path to provide a corresponding electro-optic voltage signal. The electro-optic system is fine offset calibrated during a run, with the electro-optic voltage signal measured after the calibration. During the fine offset calibration, the electro-optic voltage signal and the average reference voltage signal are input to an integrator generating a responsive offset signal. The timing correlation between the applied voltage signal the electro-optic voltage signal is randomized during this calibration so that the generated electro-optic voltage signal is an average. The feedback forces the electro-optic signal to the average reference voltage signal level. Upon stabilization, the offset signal is locked in as the calibrated fine offset signal and the timing between the applied voltage and electro-optically measured voltage signals is restored. The applied voltage signal then is sampled to generate the electro-optically measured voltage signal.
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Nguyen Vinh
Photon Dynamics, Inc.
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