Patent ID: 11946740
Assignee: ELCOMETER LIMITED
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 5:
6. A method of measuring coating thickness using a coating thickness probe comprising at least one drive coil and at least one pick-up coil, the method comprising the steps of:
driving an alternating drive current in the or each drive coil;
scaling the alternating drive current in the or each drive coil according to a first scaling factor using a first modulator;
detecting a signal output by the or each pick-up coil using a detector;
scaling an output of the detector according to a second scaling factor using a second modulator;
applying a transfer function to an output of the second modulator to determine an instrument output corresponding to a measured coating thickness; and
changing both the first and second scaling factors simultaneously based on the instrument output.