Ultrasonic Fingerprint Sensor (IMAGE) American Institute of Physics Caption An ultrasonic fingerprint sensor measures a three-dimensional, volumetric image of the finger's surface and the tissues beneath -- making it difficult to "spoof" or fake. Credit Courtesy of Dave Horsley/University of California, Davis Usage Restrictions The image may only be used with appropriate caption or credit. 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.