Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1976-08-25
1977-08-09
Corcoran, Robert J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
G01R 3312
Patent
active
040413772
ABSTRACT:
A method and apparatus for providing a digital display representing the magnetostrictive characteristics of a test specimen is disclosed. The apparatus is useful in combination with a test fixture of the type having means for inducing a periodic and alternating induction in a test specimen and including at least one displacement sensitive transducer mounted in association with the test specimen for generating a magnetostriction signal reflecting the magnetostrictive deformation of the test specimen in response to the induction. The apparatus includes a timing circuit associated with the means for inducing the induction in the test specimen, the timing circuit being adapted for producing a series of timing signals identifying the occurrences of zero and maximum induction in the specimen. A conversion circuit operates under the control of the timing circuit for deriving from the magnetostriction signal a DC difference signal which is proportional to the difference between the amplitudes of the magnetostriction signal corresponding to the occurrences of maximum and zero induction in the test specimen. The DC difference signal, which reflects the magnetostrictive characteristics of the test specimen, is applied to a display which produces a digital output corresponding to the magnitude and polarity of the DC difference signal.
REFERENCES:
patent: 2312888 (1943-03-01), Everest
patent: 2596752 (1952-05-01), Williams
patent: 2850697 (1958-09-01), Little, Jr.
Armco Steel Corporation
Corcoran Robert J.
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