An ultrasound probe array for a high-pressure, high-temperature solid medium deformation apparatus
Name
An Ultrasound Probe Array for a High_FINAL-revised version May 2020 copy_v2_no_AEloc.pdf
Description
Accepted version
Size
2.5 MB
Format
Adobe PDF
Checksum (MD5)
6622c6de57243acbc1bfb743722c1d0b
Author(s)
Ghaffari, Hamed. O
Pec, Matej
Date Issued
August 2020
Journal
Review of Scientific Instruments
Publisher
AIP Publishing
Citation
Ghaffari, H. O. and M. Pec. "An ultrasound probe array for a high-pressure, high-temperature solid medium deformation apparatus", Review of Scientific Instruments 91, 8 (August 2020): 085117. © 2020 Author(s)
Version
Author's final manuscript
Abstract
Inelastic deformation of minerals and rocks is associated with activation of various defects such as fractures, twins, and dislocations. Active and passive ultrasound probes are potential tools to examine the nature of these defects under a broad range of pressure and temperature conditions. Here, we report on the development of an ultrasound probe array that allows us to monitor deforming samples in a high-pressure, high-temperature solid medium apparatus (a modified Griggs rig). We utilize several broadband miniature piezoelectric sensors that are placed above and below the sample to record acoustic emissions accompanying deformation and determine their locations in 1D. The emissions are recorded at 50 MS/s with a 12 bit resolution. Proper grounding and electric insulation of the sensors, together with optimized power delivery from the heating system, tremendously reduces electromagnetic interference and allows for a background noise level of ≈90 mV at a full range of ±2 V and 60 dB amplification. The system is capable of recording acoustic waves from 80 kHz to 2.5 MHz at sample temperatures up to 1100 °C and confining pressure up to 2.5 GPa.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
Terms of Use
Creative Commons Attribution-Noncommercial-Share Alike
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1063/5.0004035
