Nondestructive evaluation of non-ferromagnetic materials using m

Details Nondestructive evaluation of non-ferromagnetic materials using m Nondestructive evaluation of non-ferromagnetic materials using m

1993-03-16

1995-10-17

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

73594, 73643, G01N 2914, G01N 2928

Patent

active

054579945

ABSTRACT:
A method and apparatus for the nondestructive evaluation of ferromagnetic and non-ferromagnetic materials, particularly wire ropes, cables, and strands, and pipes utilizing the magnetostrictive effect for measuring minute variations in magnetic fields and characterizing these minute variations as indicative of the acoustic/ultrasonic behavior of fractures, cracks, and other anomalies within a substance under evaluation. The apparatus and method contemplate both an active testing application, wherein a transmitting sensor generates an acoustic/ultrasonic pulse within a material through the magnetostrictive effect and a second receiving sensor detects reflected acoustic/ultrasonic waves within the material, again by the inverse magnetostrictive effect. The advantages of utilizing magnetostrictive sensors as opposed to well known piezoelectric sensors lies in the ability to generate and detect acoustic/ultrasonic waves without a direct physical or acoustical contact to the material. The apparatus and method of the present invention also anticipates the use of a passive monitoring system comprised only of a receiving magnetostrictive sensor that continuously monitors a ferromagnetic or non-ferromagnetic substance for acoustic emissions and either records this monitored information or alerts the appropriate personnel of the existence of an acoustic emission indicating deterioration within the structure.

REFERENCES:
patent: 4309903 (1982-01-01), Ono
patent: 4352038 (1982-09-01), Moreton
patent: 4593565 (1986-06-01), Chamuel

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