FABRICATION AND TESTING OF MICROWAVE SINTERED SOL-GEL SPRAY-ON BISMUTH TITANATE-LITHIUM NIOBATE BASED PIEZOELECTRIC COMPOSITE FOR USE AS A HIGH TEMPERATURE (>500° C) ULTRASONIC TRANSDUCER

2010 ◽  
Author(s):  
C. T. Searfass ◽  
A. Baba ◽  
B. R. Tittmann ◽  
D. K. Agrawal ◽  
Donald O. Thompson ◽  
...  
Keyword(s):  
High Temperature ◽  
Lithium Niobate ◽  
Bismuth Titanate ◽  
Ultrasonic Transducer ◽  
Sol Gel ◽  
Piezoelectric Composite

scholarly journals Engine Oil Condition Monitoring Using High Temperature Integrated Ultrasonic Transducers

2010 ◽  
Author(s):  
M. Kobayashi ◽  
Z. Sun ◽  
C.-K. Jen ◽  
K.-T. Wu ◽  
J. Bird ◽  
...  
Keyword(s):  
High Temperature ◽  
Sol Gel ◽  
Composite Films ◽  
Ultrasound Velocity ◽  
Ultrasonic Waves ◽  
Ultrasonic Transducers ◽  
Engine Oil ◽  
Piezoelectric Composite ◽  
Engine Operation ◽  
Lubricant Oil

High temperature integrated ultrasonic transducers (IUTs) made of thick piezoelectric composite films have been coated directly onto the lubricant oil supply and sump lines of a modified CF700 turbojet engine. These thick piezoelectric films are fabricated using a sol-gel spray technology. The center frequencies of these IUTs are in the range of 10 to 12 MHz. The top electrodes, electrical wires, conducting adhesive bond, connectors and cables have been tested successfully for temperatures of up to 500°C. By operating these IUT in transmission mode, the amplitude and velocity of transmitted ultrasonic waves across the flow channel of the lubricant oil in supply and sump lines were measured during engine operation. The results have shown that the strength of the ultrasonic waves is sensitive to the presence of air bubbles in the oil and that the ultrasound velocity is linearly dependent on oil temperature. Based on the sensitivity of ultrasound velocity to oil temperature, a method for real-time monitoring of engine oil degradation is proposed.

scholarly journals Mn-doped CaBi4Ti4O15/Pb(Zr,Ti)O3 Ultrasonic Transducers for Continuous Monitoring at Elevated Temperatures

2017 ◽  
Author(s):  
Makiko Kobayashi ◽  
Taiga Kibe ◽  
Hajime Nagata
Keyword(s):  
High Temperature ◽  
Thermal Cycle ◽  
Elevated Temperatures ◽  
Signal To Noise Ratio ◽  
Ultrasonic Transducer ◽  
Sol Gel ◽  
Ultrasonic Transducers ◽  
In Situ Monitoring ◽  
Signal To Noise ◽  
Noise Ratio

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 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 temperature. To verify the high temperature durability, CBT/PZT sol-gel composite films were fabricated on titanium substrates by spray coating, and the CBT/PZT samples were tested in a furnace at various temperatures. Reflected echoes with a high signal-to-noise ratio were observed up to 600 C. A thermal cycle test was conducted from room temperature to 600 C, and no significant deterioration was found after the second thermal cycle. To investigate the long-term high-temperature durability, a CBT/PZT ultrasonic transducer was tested in the furnace at 600 °C for 36 h. Ultrasonic responses were recorded every 3 h, and the sensitivity and signal-to-noise ratio were stable throughout the experiment.

Sol–gel prepared bismuth titanate for high temperature ultrasound transducers

RSC Advances ◽  
2012 ◽  
Vol 2 (9) ◽  
pp. 3678 ◽  
Author(s):  
SE Burrows ◽  
KL McAughey ◽  
RS Edwards ◽  
S Dixon
Keyword(s):  
High Temperature ◽  
Bismuth Titanate ◽  
Sol Gel ◽  
Ultrasound Transducers

scholarly journals Investigation of high-temperature ultrasonic transducer design using lithium niobate piezocomposite

2015 ◽  
Vol 57 (4) ◽  
pp. 193-199 ◽  
Author(s):  
K J Kirk ◽  
R Hou ◽  
N Schmarje ◽  
N M Pragada ◽  
L Torbay ◽  
...  
Keyword(s):  
High Temperature ◽  
Lithium Niobate ◽  
Ultrasonic Transducer ◽  
Transducer Design

Performance investigation on RE3+(Nd3+,Er3+) doped lithium niobate nanocrystals prepared by sol-gel technique

2007 ◽  
Author(s):  
Lihua Wang ◽  
Duorong Yuan ◽  
Xiulan Duan ◽  
Xinqiang Wang ◽  
Fapeng Yu
Keyword(s):  
Lithium Niobate ◽  
Sol Gel ◽  
Gel Technique
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