Method and apparatus for measuring inductance

Details Method and apparatus for measuring inductance Method and apparatus for measuring inductance

2005-01-04

2005-01-04

Lamarre, Guy J. (Department: 2133)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S613000, C340S933000, C340S941000

Reexamination Certificate

active

06838886

ABSTRACT:
A method and apparatus for measuring changes induced in an inductive field on a wire-loop of an oscillator circuit based upon variations in a current function without the need to measure frequency changes. Induced noise has independent effects upon the current function and voltage function of an inductance measurement circuit. By inductively coupling one input and directly coupling the second input of a comparator circuit to the inductance measurement circuit, the phase of the current function can be adjusted to coincide with the phase of the voltage function. By combining the voltage function with the current function, an output isolating the induced noise from the measured inductance is obtained.

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