Abstract: A receiver for a Pulsed Eddy Current (PEC) system configured to detect a changing electromagnetic field generated by eddy currents induced in an object of an electrically conductive material. The receiver includes an electrically conductive receiver coil, a high-voltage receiver channel, a low-voltage receiver channel, and an over-voltage protection connected between the receiver coil and the LVRC. The OVP includes a bias circuit B, a diode D connected between the receiver coil and the bias circuit, and a capacitor C connected between the bias circuit and the LVRC.

Abstract: A receiver for a Pulsed Eddy Current (PEC) system configured to detect a changing electromagnetic field generated by eddy currents induced in an object of an electrically conductive material. The receiver includes an electrically conductive receiver coil, a high-voltage receiver channel, a low-voltage receiver channel, and an over-voltage protection connected between the receiver coil and the LVRC. The OVP includes a bias circuit B, a diode D connected between the receiver coil and the bias circuit, and a capacitor C connected between the bias circuit and the LVRC.

Abstract: A measurement device for measuring properties of a metal sheet processed in a rolling mill, including: an inspection coil set including a transmitter coil and a receiver coil, the transmitter coil being configured to apply a time-varying magnetic field to the metal sheet, and the receiver coil being configured to detect a magnetic field transient produced from the metal sheet. The property of the metal sheet is derivable from the magnetic field transient. A correction coil set, for detecting a spatial deviation of the metal sheet from a reference plane, each correction coil being connectable to a capacitor to form a respective resonance circuit having a resonance frequency. The correction coils are resonated at the respective resonance frequency. A shift in the resonance frequency in the presence of the metal sheet is detectable and the spatial deviation is derivable from the shifts.

Abstract: A measurement device for measuring properties of a metal sheet processed in a rolling mill, including: an inspection coil set including a transmitter coil and a receiver coil, the transmitter coil being configured to apply a time-varying magnetic field to the metal sheet, and the receiver coil being configured to detect a magnetic field transient produced from the metal sheet. The property of the metal sheet is derivable from the magnetic field transient. A correction coil set, for detecting a spatial deviation of the metal sheet from a reference plane, each correction coil being connectable to a capacitor to form a respective resonance circuit having a resonance frequency. The correction coils are resonated at the respective resonance frequency. A shift in the resonance frequency in the presence of the metal sheet is detectable and the spatial deviation is derivable from the shifts.