Low Frequency Electromagnetic Technique LFET

Low Frequency Electromagnetic Technique also commonly referred as LFET is one of the electromagnetic testing methods utilized effectively for the inspection and assessment of Boiler Wall tubes. A low frequency electromagnetic field in induced into the boiler wall tube material using an external horseshoe shaped electromagnet. Any flaw in the path of the magnetic field distorts the magnetic flux which is detected by the array of sensors. The severity of a discontinuity is measured by analyzing a Phase / Amplitude plane graph with the aid of a custom purpose software.