Leak testing by gas flow signature analysis

摘要

To leak test a cavity in a test item, a pressurizing gas, at a preselected pressure is applied to the test item and the flow rate of the pressurizing gas during pressurization is recorded. This recorded flow rate is compared with a threshold level based on gas flow signature data for a reference test item. If the recorded gas flow exceeds the threshold level, an excessive leak signal is produced. This leak testing method significantly reduces the time required to perform low flow rate leak detection in large volume test items.