Adhesive Tester (IMAGE) Penn State Caption This image shows an experimental setup to test the ultrasonic wave modes selected by based on a variety of criteria. Researchers placed an ultrasonic wave emitter and receiver on either side of a sample bonded with adhesive to another surface. Faults purposely included are outlined in white. Credit Baiyang Ren Usage Restrictions Non commercial use only License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.