SUPERIMPOSED EDDY-CURRENT CONVERTER Russian patent published in 2002 - IPC

FIELD: instrumentation used in nuclear technology. SUBSTANCE: ferrite bar is positioned in superimposed eddycurrent converter uniaxially with excitation winding and two measurement windings of different diameter connected in opposition. Measurement windings are located in one plane and equivalent diameter of external measurement winding is chosen equal to 0.3 to 0.5 width of graphite ring of process tube of nuclear reactor of РБMK. type. Equivalent diameter of internal measurement winding equals to not more than 0.5 equivalent diameter of external measurement winding. Number of turns of internal measurement winding amounts to 0.9 to 1.1 number of turns of external measurement winding. EFFECT: increased authenticity of measurement of value of gap between channel tubes and graphite rings, reduced expenses for replacement of process tubes. 1 dwg