METHOD OF INSPECTING AIR-TIGHTNESS OF HOLLOW ARTICLE WITH OPEN END Russian patent published in 2012 - IPC G01M3/02 

FIELD: physics.

SUBSTANCE: disclosed method enables to eliminate the effect of diffusion of helium molecules through the sealing of a plug by pumping helium molecules from the annular cavity of the vacuum barrier. To this end, an airtight article is put into a test chamber which is evacuated. The article is then filled with helium. Air is pumped from the annular cavity until achieving a state of equilibrium with the test chamber. Measurements are taken using a leak detector. The time for onset of gas diffusion through the sealing of the plug is determined and helium molecules are removed from the annular cavity using a vacuum pump.

EFFECT: high quality of testing which increases reliability during operation.

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