Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
Patent
1991-06-04
1993-05-11
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rotor
324 713, 250207, 250307, G01R 3100, G01R 3102
Patent
active
052104877
ABSTRACT:
A surface is probed with a pulsed electron beam and secondary electrons are detected to produce a detector signal. First portions of the detector signal are substantially dependent on the voltage of the surface being probed, while second portions of the detector signal are substantially independent of the voltage of the surface being probed. In general, the first and second portions of the detector signal include unwanted noise caused by low-level sampling due to beam leakage and/or by scintillator afterglow in the secondary-electron detector. The detector signal is sampled during the first signal portions and is sampled during the second signal portions. The sampled first signal portions are combined with the complement of the sampled second signal portions to produce a measured voltage signal representing voltage of the conductor. In a preferred sampling scheme, alternate electron-beam sampling pulses are held-off. A first gate samples the secondary-electron detector signal when sampling pulses are not held off. A second gate samples the secondary-electron detector signal when sampling pulses are held off, and these samples are inverted. The samples from the first gate are combined with the inverted samples from the second gate to substantially cancel unwanted background noise caused by beam leakage and/or scintillator afterglow after sufficient integration.
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Masnaghetti Douglas
Richardson Neil
Takahashi Hitoshi
Burns William J.
Karlsen Ernest F.
Olsen Kenneth
Riter Bruce D.
Schlumberger Technologies Inc.
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