Resistivity Measurement by Eddy Current Methods for Real-Time Monitoring of AgeHardening in Heat Treatable Alloys

摘要

In this research, the design of an eddy current sensor system that continuouslymonitors age hardening during aging of heat treatable alloys was modified to allow for operation at temperatures up to 595 deg C. With two eddy current coils in an impedance bridge circuit, eddy currents are generated in a pure aluminum reference sample standard and an age harden able test sample. The difference in the resistivity of the aging test sample relative to the reference sample results in a bridge unbalance voltage, Delta V sub BCA, which is continuously measured by a multimeter. Also, calibration procedures were developed to allow conversion of