Electricity: measuring and testing – Magnetic – Stress in material measurement
Patent
1987-12-22
1990-06-05
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Stress in material measurement
73779, 7386269, 324223, G01B 724, G01L 112, G01R 3314, G01R 3318
Patent
active
049317296
ABSTRACT:
A magnetic domain strain gage and method of digitally measuring strain or fatigue within a ferromagnetic material by measuring the time required for an increasing magnetizing force to cause magnetic domains to flip orientation in a ferromagnetic material as a function of strain or stress within the material. The magnetic domain's maximum rate of flip is measured as a time differential by a high frequency digital oscillator which provides a digital signal indicative of the strain thereby providing increased compatibility with digital data acquisition systems and having a superior signal to noise ratio in comparison with present low signal level analog resistance strain gages.
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Abel David B.
Allied-Signal Inc.
Strecker Gerard R.
Walsh Robert A.
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