ET Historical Contributors
Hans Christian Ørsted: Discovered magnetic field around a current1820
André-Marie Ampère: Studied interaction of current-carrying conductors1820–1825
Michael Faraday: Discovered electromagnetic induction1831–1834
Heinrich Lenz: Formulated Lenz’s Law (induced currents oppose the cause)1834
Franz Ernst Neumann: Developed mathematical theory of electromagnetic induction1845
Hermann von Helmholtz: Applied energy conservation to electromagnetic theory1847
James Clerk Maxwell: Unified electricity & magnetism via Maxwell’s equations1873–1879
William Thomson (Lord Kelvin): Developed solutions to Bessel’s equation, helped model ECT behavior1850s–1880s
David E. Hughes: Demonstrated metal differentiation with electromagnetic induction1860s
Charles P. Steinmetz: Introduced phasor analysis and impedance diagrams1890s–1900s
Early ECT Practitioners (1920s–1940s)
Charles W. Burroughs: Early ECT instruments at Magnetic Analysis Corp. 1925–1940s
Carl Kinsley: Patented ECT comparator designs. 1930s–1940s
Theodore Zuschlag: Co-developer of MAC eddy current systems. 1930s–1940s
Archibald H. Davis: Contributed ECT innovations at Republic Steel. 1930s–1940s
Horace G. Knerr: Republic Steel ECT innovator. 1930s–1940s
Alfred R. Sharpies: Early ECT tester developer at Republic Steel. 1930s–1940s
Ross Gunn: Developed probe-based ECT systems at U.S. Naval Research Lab. 1940s
Dr. Trygve Yensen: Developed low-loss electrical steels and annealing methods at Westinghouse. 1930s–1940s
Post-War Innovators (1950s–1970s)
Friedrich Förster: Father of modern ECT; phase plane, lift-off compensation, quantitative systems. 1948–1960s
Hugo L. Libby: Hanford researcher; multifrequency ECT, frequency mix analysis. 1950s–1970s
Caius V. Dodd: Oak Ridge; mathematical modeling of ECT systems. 1950s–1970s
J.A. Deeds: Oak Ridge collaborator with Dodd; early field modeling work. 1950s–1970s
Richard Hochschild: Commercialized Förster’s work in U.S.; early microwave ECT. 1950s–1970s
Robert Oliver: Early adopter and integrator of ECT in U.S. industry. 1950s–1960s
Robert McClung: Contributed to post-war ECT innovations and training. 1950s–1970s
Richard Betz: ECT in nuclear turbine blade inspection. 1970s
Clyde J. Denton: Developed steam generator ECT systems. 1970s
E.R. Reinhart: Applied round-robin testing to ECT system evaluation. 1970s
Allen Wehrmeister: Led nuclear industry applications for ECT. 1970s
Ron Botsco: Advocated for microwave NDT; worked with Hochschild. 1970s
John D. Kraus: Applied Maxwell’s field theory to radio astronomy (mentioned as ECT analogy). 1960s–1970s