Measuring and testing – With fluid pressure – Leakage
Patent
1987-02-02
1988-09-20
Tokar, Michael J.
Measuring and testing
With fluid pressure
Leakage
73 52, G01M 336
Patent
active
047716304
ABSTRACT:
Method and apparatus for testing hermetic seal integrity of sealed packages and containers, are provided. The method includes placing a sealed test package having at least one semi-flexible surface, within a test chamber. The pressure within the test chamber is changed from a first value to a second value, over the time interval of a test cycle. During the time interval of the test cycle, both the pressure within the test chamber and the displacement of the semi-flexible surface of the test package are continuously measured, and produced therefrom, are a first analog data signal proportional to the pressure within the test chamber, and a second analog data signal proportional to the displacement of the semi-flexible surface of the test package. During the time interval of the test cycle, the first analog data signal is converted into a first discrete data sequence, and the second analog data signal is converted into a second discrete data sequence. From the first discrete data sequence and the second discrete data sequence, a correlation estimate is computed in accordance with principles of statistical analysis, as to provide a reliable measure of hermetic seal integrity of the test package.
REFERENCES:
patent: 3837215 (1974-09-01), Massage
Croce Carlo P.
Halaby Sami A.
Oefinger Arthur R.
Gaglia, Jr. Charles A.
Jeanette Henry C.
Nath Gary M.
Roskos Joseph W.
Tokar Michael J.
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