Event Title

Understanding the Analysis of Ultrasonic Propagation in Ablative Materials

Session Number

R02

Advisor(s)

Carol Vorres, Industrial Measurement Systems Inc.
Donald Yuhas, Industrial Measurement Systems Inc

Location

B-133

Start Date

28-4-2016 11:05 AM

End Date

28-4-2016 11:30 AM

Disciplines

Physics

Abstract

Ultrasonic thermometry uses precise ultrasonic time-of-flight (ToF) to remotely measure temperature in materials without direct access to a hot surface and without disturbing the thermal transport at that heated surface. This technique has been used to measure the internal barrel temperature during firing of large Navy guns with sensors attached to the external barrel surface. This technique has also been used to measure the temperature of thermal protective materials during space vehicle re-entry. Ultrasonic thermometry relies on various propagation models to determine the estimated ToF of the ultrasonic wave. The scope of this SIR involves comparing various models and verifying model calculation results with laboratory experimental data on a known material. First, a simple model based on geometrical optics was compared to a MatLab wave propagation model. Secondly, several parameters such as sample size, sensor dimensions, frequency, ultrasonic velocity and attenuation were varied in the MatLab model to determine optimal settings and model convergence. Using optimal settings, the model was used to simulate the laboratory experimental conditions on a copper block test sample. Lastly, a series of ToF measurements were made on the copper block and compared with the model calculations.


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Apr 28th, 11:05 AM Apr 28th, 11:30 AM

Understanding the Analysis of Ultrasonic Propagation in Ablative Materials

B-133

Ultrasonic thermometry uses precise ultrasonic time-of-flight (ToF) to remotely measure temperature in materials without direct access to a hot surface and without disturbing the thermal transport at that heated surface. This technique has been used to measure the internal barrel temperature during firing of large Navy guns with sensors attached to the external barrel surface. This technique has also been used to measure the temperature of thermal protective materials during space vehicle re-entry. Ultrasonic thermometry relies on various propagation models to determine the estimated ToF of the ultrasonic wave. The scope of this SIR involves comparing various models and verifying model calculation results with laboratory experimental data on a known material. First, a simple model based on geometrical optics was compared to a MatLab wave propagation model. Secondly, several parameters such as sample size, sensor dimensions, frequency, ultrasonic velocity and attenuation were varied in the MatLab model to determine optimal settings and model convergence. Using optimal settings, the model was used to simulate the laboratory experimental conditions on a copper block test sample. Lastly, a series of ToF measurements were made on the copper block and compared with the model calculations.