Measurement of metallurgical properties in ferromagnetic test pa

Details Measurement of metallurgical properties in ferromagnetic test pa Measurement of metallurgical properties in ferromagnetic test pa

1990-03-26

1992-09-01

Lall, Parshotam S.

Boots, shoes, and leggings

G06F 1520

Patent

active

051445654

ABSTRACT:
Apparatus for measuring metallurgical properties of a ferromagnetic test piece that includes a variable frequency oscillator for providing a periodic signal, and a test coil arrangement for applying the periodic signal to a test piece to generate eddy currents therein. A test signal is developed in response to eddy currents induced in the test piece and fed to a microprocessor-based digital controller. The digital controller is coupled to the oscillator for generating the oscillator periodic signal at successive first and second test frequencies. At least two harmonic components of the test signal are separated from each other by the digital controller at each test frequency. A plurality of constants empirically relating amplitude and phase characteristics of the harmonics to the desired material properties are prestored in the digital processor, and are employed in conjunction with amplitude and phase information of the separated harmonic components during a test operation using linear regression techniques for determining desired properties of the test piece.

REFERENCES:
patent: 4507740 (1985-03-01), Star et al.
patent: 4628261 (1986-12-01), Huschelrath et al.
patent: 4630229 (1986-12-01), D'Hondt
patent: 4631688 (1986-12-01), Boehm et al.
patent: 4821204 (1989-04-01), Huschelrath

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