Apparatus for performing quantitative measurement of DC and AC c

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Using radiant energy

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324750, 3242441, 324753, G01R 3100

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active

059695170

ABSTRACT:
A laser probe for measuring a magnetic field is disclosed. A polarized laser beam is passed through a magneto-optic crystal in the presence of an unknown magnetic field. The rotation of the polarization which occurs through the magneto-optic crystal is measured in order to determine the magnitude of the magnetic field. The measured magnetic field is used to determine, for example, the current through a conductor such as an interconnect line on a semiconductor chip. A method of calibrating the magnetic field using a known magnetic from a solenoid is also disclosed. Further disclosed is a method of providing a zero-reference current by momentarily stopping the chip clock.

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