Patent ID: 7701205
Filing Date: 2010-04-20
Classification: G01B,G01R

Abstract:
1. A method for non-contact measurement of a dimension and/or an electrical property of an electrically conductive object to be measured, the method comprising: placing a transmitter coil on one side of the object to be measured, placing a receiver coil on another, opposite, side of the object to be measured, generating a magnetic field in the transmitter coil, suddenly changing the magnetic field generated in the transmitter coil, detecting a voltage induced in the receiver coil, determining a period of time that elapses from a time of the change of the magnetic field in the transmitter coil up to a time when a voltage starts being induced in the receiver coil, determining a maximum magnitude of the voltage induced in the receiver coil, and based on measured values received, calculating the dimension and/or electrical conductivity of the object to be measured, wherein the voltage induced in the receiver coil is integrated, and wherein the dimension and/or electrical conductivity of the object to be measured is calculated based on a value of the integrated signal at least two different points in time.