Method and an apparatus for detecting a possible leak in a vacuu

Details Method and an apparatus for detecting a possible leak in a vacuu Method and an apparatus for detecting a possible leak in a vacuu

1988-06-15

1989-07-11

Levy, Stewart J.

Measuring and testing

With fluid pressure

Leakage

G01M 332

Patent

active

048459771

ABSTRACT:
A method of detecting a possible leak in a vacuum package, including placing the package in a gauging space, shutting off the gauging space, applying a pressure in the closed gauging space higher than that in the vacuum package, and gauging the pressure in the gauging space as function of the time for a predetermined gauging period. At least two identical vacuum packages are each placed in a separate gauging space of identical size. A mutually identical initial pressure is applied in the closed gauging spaces and the pressure variation is simultaneously gauged in the closed gauging spaces, while the difference in pressure variation between the two gauging spaces is determined. An apparatus is used which includes at least two gauging spaces of identical size, each for receiving an identical vacuum package. These gauging spaces are connectable to a common space. The gauging space can be shut off from the common space. The pressure can be simultaneously gauged as a function of the time in each gauging space. A device is provided for determining the difference in pressure variation between the two or each pair of gauging spaces. The gauging spaces can be bounded by stationary walls or by a sheet-like, flexible and gas-tight body.

REFERENCES:
patent: 3352146 (1967-11-01), Lyssy
patent: 3792607 (1974-02-01), Fukuda
Patent Abstracts of Japan, vol. 9, No. 54, 3/1985 & JP,A, 59/190632, 10/1984.
Patent Abstracts of Japan, vol. 3, No. 106, 9/1979 & JP,A, 54/83496, 7/1979.
Patent Abstracts of Japan, vol. 3, No. 44, 4/1979 & JP,A, 54/22888, 2/1979.

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