Science University Research Symposium (SURS)
Publication Date
Fall 2026
College
College of Sciences & Mathematics
Department
Chemistry and Physics, Department of
SURS Faculty Advisor
Dr. Matthew Zeh ([email protected])
Presentation Type
Poster Presentation
Abstract
Acoustic wave propagation through granular materials such as sand is influenced by moisture content, porosity, and interactions between particles. This project focuses on the development and validation of a custom ultrasonic pitch-catch system to investigate how moisture content affects wave speed and attenuation in sand. We assembled the system by integrating two 200 kHz ultrasonic transducers in a pitch–catch configuration, with a function generator and an oscilloscope to measure acoustic signals. The function generator drives the transmitting transducer with sinusoidal bursts to send ultrasonic waves through the sample, while the oscilloscope is used to measure the transmitted and received signal amplitudes and the delay between the excitation and receiver. Initial tests in water were performed to establish a reference for subsequent measurements in sand. Transducer separation and excitation amplitude were varied to improve signal detection. Preliminary observations revealed oscillatory signals accompanied by background noise, making it difficult to distinguish acoustic arrivals from possible electrical interference. These findings highlight the importance of improving signal quality and verifying acoustic transmission before reliable wave speed and attenuation measurements can be obtained in sand.
Recommended Citation
Ochoa Flores, Valentina A., "Developing a pitch-catch system for Investigating Acoustic Wave Propagation in Granular Media" (2026). Science University Research Symposium (SURS). 387.
https://repository.belmont.edu/surs/387
