Full waveform analysis for high pressure ultrasonic measurement.

Area of Science:

• Geophysics
• Materials Science
• High-Pressure Physics

Background:

• Ultrasonic velocity measurements are crucial for understanding material properties under extreme conditions.
• Analyzing ultrasonic echoes in high-pressure apparatus can be challenging due to signal overlap.

Purpose of the Study:

• To present a novel data analysis protocol for ultrasonic velocity measurements.
• To enable accurate analysis of complex ultrasonic signals obtained in high-pressure experiments.

Main Methods:

• A data analysis protocol for ultrasonic velocity measurements was developed.
• The protocol utilizes synthetic ultrasonic signals modeled from the first echo off the anvil-assembly boundary.
• Echoes are modeled as delta functions convolved with this waveform, allowing for data fitting.

Main Results:

• The developed protocol effectively models synthetic ultrasonic signals.
• This method allows for the analysis of overlapped echoes, a common issue in high-pressure experiments.
• The protocol is suitable for data from synchrotron X-ray facility-based multi-anvil high-pressure apparatus.

Conclusions:

• The reported protocol provides a robust method for analyzing ultrasonic velocity data under high pressure.
• This advancement facilitates more accurate material characterization in extreme environments.
• The technique is particularly useful for experiments involving small sample assemblies and high pressures.