High Temperature Flexible Ultrasonic Transducers for Structural Health Monitoring and Ndt
نویسندگان
چکیده
Flexible ultrasonic transducers (FUTs) consisting of a 75 μm thick metal membrane, a piezoelectric composite with a thickness larger than 85 μm and a top electrode were developed for structural health monitoring (SHM) and non-destructive testing (NDT) applications. The piezoelectric films were made by a sol-gel spray technique. Its ultrasonic performance in terms of signal strength is at least as good as commercially available broadband ultrasonic transducers at room temperature. Onsite gluing and brazing installation techniques which bond the FUTs onto steel pipes for SHM and NDT purposes up to 100°C and 150°C are developed, respectively. The best thickness measurement accuracy of FUT at 150°C was estimated to be 26 μm.
منابع مشابه
High Temperature Integrated and Flexible Ultrasonic Transducers for NDT
Integrated (IUTs) and flexible ultrasonic transducers (FUTs) are presented for NDT at high temperatures. These transducers are made of sol-gel sprayed piezoelectric thick (> 40μm) ceramic films. The ceramic materials are lead-zirconate-titanate, bismuth titanate and lithium niobate which are for thickness measurement up to 150°C, 400°C and 800°C, respectively. The IUT can be also deposited onto...
متن کاملMn-Doped CaBi4Ti4O15/Pb(Zr,Ti)O3 Ultrasonic Transducers for Continuous Monitoring at Elevated Temperatures
Continuous ultrasonic in-situ monitoring for industrial applications is difficult owing to the high operating temperatures in industrial fields. It is expected that ultrasonic transducers consisting of a CaBi₄Ti₄O15(CBT)/Pb(Zr,Ti)O₃(PZT) sol-gel composite could be one solution for ultrasonic nondestructive testing (NDT) above 500 °C because no couplant is required and CBT has a high Curie tempe...
متن کامل1 Mn - doped CaBi 4 Ti 4 O 15 / Pb ( Zr , Ti ) O 3 Ultrasonic 2 Transducers for Continuous Monitoring at Elevated 3 Temperatures 4
Continuous ultrasonic in-situ monitoring for industrial applications is difficult owing to 11 the high operating temperatures in industrial fields. It is expected that ultrasonic transducers 12 consisting of CaBi4Ti4O15(CBT)/Pb(Zr,Ti)O3(PZT) sol-gel composite could be one solution for 13 ultrasonic nondestructive testing (NDT) above 500 °C because no couplant is required and CBT has 14 a high C...
متن کاملDesign of Embedded Piezoelectric Transducers for Structural Health Monitoring in Concrete Structures
In the last decades the field of structural health monitoring and damage detection has been intensively explored. Active vibration technique allows to excite the structure at high frequency vibrations which are sensitive to small damage. Ideal candidates for the generation of high frequency (ultrasonic) signals are piezoelectric PZT transducers, due to their small size, low cost and large bandw...
متن کاملIntegrating monitoring and inspection with attached ultrasonic transducers
Ultrasonic methods are widely applied for nondestructive evaluation of structural components during both the manufacturing process and subsequent field inspections. The field inspections often require expensive teardown in order to access the back surfaces of critical components. Active ultrasonic methods are also a subject of ongoing research for structural health monitoring whereby transducer...
متن کامل