Automated Process for Testing the Airtightness of Encapsulated Modules
Original Publication Date: 1986-Dec-01
Included in the Prior Art Database: 2005-Mar-09
The conventional processes currently used for testing the airtightness of small sealed elements, such as the covers of encapsulated modules, generally call for two successive operations to reveal the possible presence of so-called fine leaks and gross leaks. The fine leaks are revealed by using mass spectography techniques during a first operation, whereas the gross leaks are revealed during a subsequent operation by immersing the module into a fluorocarbon bath and checking for any air bubbles emanating from the module cover. Such conventional operations are time consuming and, furthermore, make it impractical to automatize the test. The present process calls for holographic interferometry for testing the airtightness of the covers of encapsulated modules.