Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Using radiant energy
Patent
1988-09-28
1990-02-27
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Using radiant energy
356365, 364577, G01R 3100, G01R 3102
Patent
active
049049313
ABSTRACT:
The voltage between two objects is measured utilizing an electro-optic crystal exhibiting birefringence in two axes (slow and fast) mutually orthogonal to an optic axis extending between the two objects. Two collimated light beams polarized at an angle to the slow and fast axes is passed through the crystal parallel to the optic axis with one of the collimated light beams retarded relative to the other by about 1/4 wave. The two beams emerging from the crystal are passed through a polarizer and converted to phase shifted electrical signals by photo diodes in electric circuits which regulate the sources of the light beams to maintain the peak magnitudes of the two electric signals constant and equal. As another feature of the invention, a stairstep output waveform representative of the measured waveform is generated in a digital computer from a bidirectional cumulative count of zero crossings of the two electric signals which is incremented or decremented depending upon which of the two electrical signals is leading. Improved accuracy of the output signal is achieved by adjusting the stairstep waveform by the magnitude of the smaller of the two electrical signals, with the sense of the adjustment determined by the relative polarities of the two electrical signals.
REFERENCES:
patent: 3769584 (1973-10-01), Iten et al.
patent: 4629323 (1986-12-01), Matsumoto
patent: 4698497 (1987-10-01), Miller et al.
A. Yariv, Introduction to Optical Electronics, 2nd Edition, copyright 1977, pp. 253-259, Holt, Rinehart and Winston.
Day et al., Optical Power Line Voltage and Current Measurement Systems, vol. 1, Research Project 2748, National Bureau of Standards, Boulder, Colo.
Burns W.
Karlsen Ernest F.
Studebaker B. R.
Westinghouse Electric Corp.
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