Method of inspecting internal pressures in sealed containers

Details Method of inspecting internal pressures in sealed containers Method of inspecting internal pressures in sealed containers

1980-12-22

1983-08-16

Krass, Errol A.

Boots, shoes, and leggings

73 52, 364508, G01L 910, G01M 336

Patent

active

043995144

ABSTRACT:
A nondestructive method for inspecting internal pressures of sealed containers wherein a magnetic impulsive force is impinged upon a metallic surface of the container and the resulting vibration of the metallic surface is detected. The detected signal is applied to a plurality of band-pass filters from which the fundamental and harmonics are extracted. The two highest level signals extracted from the band-pass filters, designated the fundamental and a harmonic, are selected, which signals are analyzed by comparison to predetermined values for level and frequency and for their ratio of their levels with respect to one another. A judgment as to the integrity of the sealed container may be made based upon the deviation from the aforesaid predetermined values.

REFERENCES:
patent: 4187718 (1980-02-01), Shibasaki
patent: 4223790 (1980-09-01), Yoshida
patent: 4243932 (1981-01-01), Kakumoto et al.
patent: 4313171 (1982-01-01), Shibasaki

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