Seal Voids


Time Domain Imaging (TDI)™
Utilizes an echo (amplitude & polarity) arrival ‘time’ as a reference, such as standard A-Scan, B-Scan and C-Mode type images.

Seal Voids

Polymer Pouch Seal Integrity, Through Transmission - Application Note 801

Seal Voids

Sample & Method

A polymer pouch was imaged using the THRU-Scan.


The blue areas within the seal (gray band) are locations of signal loss, representing voids which block transmission of the ultrasound through the sample. As these voids become larger, they connect and threaten the integrity of the package by providing a leak path. This is an example of a relatively good seal.