Steam generator mapping with reflections of eddy current signal

A method to determine deposits in a steam generator, comprising:

• creating a calibration standard having at least two rings of deposit material;
• subjecting the calibration standard to an eddy current signal, wherein an amplitude of the signal reflected from the calibration standard is used to obtain a polynomial equation fit of the reflected eddy current signals to actual thickness of the rings;
• obtaining a baseline signal offset from the calibration standard;
• obtaining a steam generator with tubes;
• initiating an eddy current signal into the tubes of the steam generator;
• detecting and recording reflections of the eddy current signal initiated into the tubes of the steam generator;
• subtracting the baseline signal offset from the reflected eddy current signals to obtain a corrected reflected eddy current signal;
• and
• determining a thickness of the deposits in the steam generator from the corrected reflected eddy current signal through the polynomial equation fit.