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MAE PhD Defense – Taeyang Kim
April 23 @ 3:00 pm - 5:00 pm
TITLE: Novel Piezoelectric Sensors: Design, Prototyping and Characterization
ADVISOR: Dr. Xiaoning Jiang
DATE & TIME: Monday, April 23, 2018 at 3 PM
LOCATION: EB3 – 3235B
Piezoelectric sensors are widely utilized for automotive, aerospace, biomedical, civil and energy industries owing to their high sensitivity, broad bandwidth, low power consumption, and cost-effectiveness. Despite these advantages, there are still crucial limitations of piezoelectric sensors in the lack of reliability, sensitivity and applicability in the actual conditions. So the main theme of this dissertation is the development of novel piezoelectric sensors focusing on the efficiency of design, prototyping and applicability. Four different types of the ultrasound transducers were aimed to be developed for the aerospace, biomedical and civil applications: 1) Piezoelectric floating element shear stress sensor for the wind tunnel flow measurement, 2) Transit time difference flowmeter for intravenous flow rate measurement using 1-3 piezoelectric composite transducers, 3) AlN ultrasound sensor for photoacoustic Lamb wave detection in a high temperature environment, 4) Flexible piezo-composite ultrasound transducers for biomedical applications. Prototype sensors were designed, fabricated, characterized, and the performance for each application was tested in lab bases. The results indicated that the newly developed prototype sensors and design considerations provided in this study can be useful for developing various types of sensors in measuring the stress, flow rate, structural integrity and biomedical signal.
Taeyang Kim was born on November 17, 1981 in Taegu, South Korea. He received his Bachelor of Science in Mechanical Engineering from Korea Military Academy, Seoul, Korea in 2005, and his M.S. degree in Mechanical Engineering from Texas A&M University, College Station, TX, in 2009. In August 2014, he started his work as a PhD student in the Department of Mechanical & Aerospace Engineering, North Carolina State University. Currently, he is working as a Research Assistant at the Micro/Nano Engineering Laboratory (MNEL) under Dr. Xiaoning Jiang. His broad research interests involve high temperature piezoelectric sensors, shear stress sensor, IV flowmeter and ultrasonic NDT/biomedical sensors.