Quick leak detection on dimensionally stable/slack packaging without the addition of test gas

US10845266B2 · kind B2 · utility

Assignee

• INFICON AG · LI

Inventors

• Silvio Decker · Cologne, DE
• Daniel Wetzig · Cologne, DE
• Hjalmar Bruhns · Bonn, DE
• Stefan Mebus · Cologne, DE

Key dates

• Filing date: Jan 9, 2019
• Grant date: Nov 24, 2020
• Expiry date: Jan 9, 2039

Classification

• Technology area (CPC G): Physics
• CPC primary: G01M3/3218
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method for leak detection of a test specimen includes providing an evacuable film test chamber which is operatively coupled to a pressure measuring device, and at least one processor operatively coupled to the pressure measuring device; measuring a pressure within the evacuable film test chamber by the pressure measuring device at predetermined times during a measurement period of time; calculating by the processor, a first or higher order derivative of a pressure change with respect to time at a first predetermined time, and a first or higher order derivative of a pressure change with respect to time at least at a second predetermined time during the measurement period of time, to provide at least a pair of derivative values; and categorizing by the processor a leaky or tight state of the specimen under test by a pattern recognition process based on the pair of derivative values.