PTI’s proprietary Airborne Ultrasound technology is a non-destructive seal quality inspection solution. Airborne ultrasound can be used for many material types such as Tyvek, paper, foil, film, aluminum, plastic & poly. PTI’s Seal-Scan (Offline) and Seal-Sensor (Online) both utilize the non-contact airborne ultrasonic testing technology. As a package seal passes through the sensor head, ultrasonic waves propagate through the material causing reflection of the sound waves. When defects are encountered, they result in a reduction/elimination of the signal strength – identifying the defect. The greater the acoustic difference between mediums (most evident at gas to solid transition) the more sound is reflected, and the less sound transmitted through the seal.