| 摘要 |
A method is described of non-destructive testing an evacuated package for the presence of a leak, said evacuated package comprising a sealed filled evacuated bag (1) containing a predetermined quantity of a comminuted product, which comprises:causing a surface (2) of a sealed filled evacuated bag (1) under test to impact under controlled conditions with a supported piezo electric device (7), andmeasuring a resultant transient electrical test signal.
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