Patent ID: 7859257

Claim:
A system for carrying out eddy current measurements on components for nuclear reactors when these components are located in water, wherein the system is adapted to measure at least one property of these components, such as the thickness of at least one layer located on the component, by generating at least one electromagnetic alternating field which penetrates the component in question and in the same generates eddy currents which retroact on the generated electromagnetic alternating field, wherein the system is arranged to carry out the measurement of the property in question by measuring a response to the generated electromagnetic alternating field and carrying out a calculation of the property in question, wherein the system comprises, a control unit located outside of the water and arranged to control the measurement, a measurement probe moved to the immediate vicinity of the components in the water, wherein the measurement probe comprises means, preferably at least one coil, with the help of which the electromagnetic alternating field which penetrates the component in question is generated, a first cable constituting at least a part of the connection between the control unit and the measurement probe, wherein this cable is at least partially located in the water, and a switching unit located in the water and arranged to be connected with said first cable, and to be connected with the measurement probe, wherein the switching unit comprises a switching device which can assume at least a first and a second state, wherein in the first state the first cable is connected with the measurement probe and in the second state the first cable is not connected with the measurement probe.