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A cost effective PC based Eddy Current Testing System is designed and developed to detect surface cracks in nonmagnetic metals. The developed system is composed of Constant Current AC Source for excitation of the probe; and demodulation circuitry for acquisition of the signal from the crack. Eddy Current Testing Probe is also designed using the Analytical Approach. Surface cracks were successfully detected through developed system. The flaw signal is also plotted in real time on PC. Data logging feature and position sensing is also incorporated.

an endeavor has been done to produce a cost effective Eddy Current Testing System. For this purpose, study was carried out on using the Improved Howland Pump as a constant current AC source for exciting inductive load transducer i.e. the Eddy Current Testing (ECT) probe. Experimental validation was performed by fabricating the constant current AC pump and using it for excitation purposes in the eddy current testing system. As a result, through-hole surface cracks were successfully detected which proved the working of the Improved Howland Current pump as a constant current AC source. It is a valuable technique for exciting Eddy Current Probes.

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