Patent
Method of inspecting internal pressures in sealed containers
Mikihiko Hamasaki,Kozo Oba +1 more
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TLDR
In this paper, a non-destructive method for inspecting internal pressures of sealed containers is proposed, where a magnetic impulsive force is impinged upon a metallic surface of the container and the resulting vibration of the metallic surface is detected.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.read more
Citations
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References
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Patent
Container inspection system
TL;DR: A package inspection system is used for automatic inspection of a different content or identification of a content in a package such as a container especially a large container in unloading from a ship without opening or unpacking the container.
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TL;DR: In this article, a method and apparatus for inspecting the internal pressure of hermetically sealed containers wherein a sound wave of free damped oscillation exicted at the elastic wall of a container is converted and detected as an electrical signal, analysis is performed for the natural self-correlation function of this detected signal by using logical operation circuits, and thus, the adequacy of internal pressure is discriminated by measuring the period of such function.
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