Triboluminescence Instrument (2 of 2) (IMAGE) Purdue University Caption The back side of an instrument created by Purdue University researchers to determine if pharmaceutical formulations have trace crystallinity. The main circuit board that controls the instrument consists of a high-power voltage regulator to power the striking solenoid. The instrument was created in collaboration with the Department of Chemistry's Jonathan Amy Instrumentation Facility. Credit (Image provided) Usage Restrictions None 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.