Method and apparatus for testing the fluid-tight sealed integrity of hermetically-sealed package

摘要

A leak detector is adapted to test the fluid-tight sealed integrity of a hermetically-sealed package having a movable wall portion. An enclosure surrounds a package-to-be-tested, and the space within the enclosure is evacuated by a vacuum pump. As the pressure acting on the outer surface of the package begins to fall, the gas within the package will expand, pushing the movable wall portion outwardly. Such displacement of the movable wall portion is sensed and compared with a predetermined value. If desired, the reduced pressure within the enclosure may be held constant for a time interval, and the sensor used to determine whether the distended wall portion has relaxed.