Eddy current inspection device for nondestructive testing

An eddy current inspection device for nondestructive testing, the device comprising:

• a bobbin-shaped coil configured to be inserted into a specimen, which is an object of nondestructive testing, and to apply induction current to an inner diameter of the specimen;
• a cylindrical manual sensor array configured to disposed in the bobbin-shaped coil and to include lines and rows;
• and
• a control module configured to select one or more frequencies of multiple frequencies, apply AC power to the bobbin-shaped coil, generate a square wave signal with a varying phase difference, and perform first multiplication by an applied signal and the square wave signal,
• wherein the control module is configured to switch and apply driving power such that arc-directional rows are sequentially selected from a plurality of rows of the cylindrical manual sensor array, and to perform second multiplication of multiplying the applied signal by the square wave signal with a varying phase frequency, and
• configured to detect a flaw of the specimen on the basis of the first multiplied signal and the second multiplied signal, using amplitude and phase difference distribution of a signal.

An eddy current inspection device for nondestructive testing, the device comprising:

• a bobbin-shaped coil configured to be inserted into a specimen, which is an object of nondestructive testing, and to apply induction current to an inner diameter of the specimen;
• a reference coil configured to be inserted into a nondestructive specimen, which is a reference of the specimen, and to apply induction current to an inner diameter of the nondestructive specimen;
• a ring-shaped manual sensor array configured to disposed in the bobbin-shaped coil and to include one row;
• and
• a control module configured to select one or more frequencies of multiple frequencies, apply AC power to the bobbin-shaped coil and the reference coil, generate a square wave signal with a varying phase difference, and perform first multiplication by an applied signal and the square wave signal,
• wherein the control module is configured to apply driving power to the ring-shaped manual sensor array and to perform second multiplication of multiplying the applied signal by the square wave signal with a varying phase frequency, and
• configured to detect a flaw of the specimen on the basis of the first multiplied signal and the second multiplied signal, using amplitude and phase difference distribution of a signal.