ELECTROINDUCTIVE INSTRUMENT FOR CHECKING DIMENSIONS AND DETECTING FLAWS IN METAL PRODUCTS,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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The object of the invention is an electroinductive instrument for checking dimensions and detecting flaws in metal products based on the method of excitation and recording in a controllable area of eddy currents, which contains an inductive pickup, a comparison pickup, a generator of electrical oscillations, an amplifier, an indicator, and electrical elements of regulation. To reduce the temperature error of the measuring pickup and to increase the precision of checking, the coil of the pickup is provided with an additional winding wound with double wire which is soldered at one end. The free ends of the wire are included in the circuit of the automatic compensator on the axis of the motor of which there are mounted slides of the elements of the temperature compensation of the measuring bridge.