Device for use in eddy current testing for transmission of signals between a signal processing device and a signal source

A device for transmission of signals between a signal processing device and a signal source mounted in a housing being movable relative to a test object, comprising a non-rotating base member, a holder having an end face adapted to be positioned adjacent a surface of the test object for rotatably supporting the signal source, a support member extending from said non-rotating base member, and including a first bearing for rotatably supporting the holder about a rotation axis intersecting said test object, a second bearing in the end face of the holder by which the signal source housing is eccentrically journalled to the holder, a connecting link in the form of a tube interconnecting the non-rotating base member and the signal source housing, a first coupling mechanically connecting the connecting link to the non-rotating base member adjacent to the rotation axis of the holder, a second coupling mechanically connecting the connecting link to the signal source housing, and signal conducting means within the connecting link extending between the signal processing device and the signal source through the first and second couplings, said first and second couplings being flexible couplings permitting the connecting link to rotate relative to the non-rotating base member, and rotation limiting means for substantially preventing the signal source to rotate more than 360 degrees relative to the non-rotating base member and including projections extending outwardly from the tube and engaging respective projections extending from said signal source and said non-rotating base member adjacent to the first and second couplings, said connecting link tube being adapted to allow liquid coolant to be transported to the signal source.