Application of Acoustic Emission Technique as a Monitor System to FRP Cryostat

The acoustic emission (AE) from FRP cryostats has been studied in order to establish the monitoring systems of FRP Cryostat. Kaiser effect was found in FRP cryostat and hence using AE method we can estimate the stress history of any FRP cryostat. Condition of coolant was also detected by AE techniques. Sudden decrease of internal pressure which leads to the rapid evaporation of coolant can be detected as sudden increase of AE counts. It is also found that the vacuum leak area caused by gaseous pressure could be located by the location of AE sources.