Measurement of broadband temperature-dependent ultrasonic attenuation and dispersion using photoacoustics. IEEE Trans Ultrason Ferroelectr Freq Control 2009 Aug;56(8):1666-76
Date
08/19/2009Pubmed ID
19686982DOI
10.1109/TUFFC.2009.1231Scopus ID
2-s2.0-68649092589 (requires institutional sign-in at Scopus site) 39 CitationsAbstract
The broadband ultrasonic characterization of biological fluids and tissues is important for the continued development and application of high-resolution ultrasound imaging modalities. Here, a photoacoustic technique for the transmission measurement of temperature-dependent ultrasonic attenuation and dispersion is described. The system uses a photoacoustic plane wave source constructed from a polymethylmethacrylate substrate with a thin optically absorbent layer. Broadband ultrasonic waves are generated by illuminating the absorbent layer with nanosecond pulses of laser light. The transmitted ultrasound waves are detected by a planar 7-microm high-finesse Fabry-Perot interferometer. Temperature-induced thickness changes in the Fabry-Perot interferometer are tracked to monitor the sample temperature and maintain the sensor sensitivity. The measured -6 dB bandwidth for the combined source and sensor is 1 to 35 MHz, with an attenuation corrected signal level at 100 MHz of -10 dB. The system is demonstrated through temperature-dependent ultrasound measurements in castor oil and olive oil. Power law attenuation parameters are extracted by fitting the experimental attenuation data to a frequency power law while simultaneously fitting the dispersion data to the corresponding Kramers-Krönig relation. The extracted parameters are compared with other calibration measurements previously reported in the literature.
Author List
Treeby BE, Cox BT, Zhang EZ, Patch SK, Beard PCAuthor
Sarah K. Patch PhD Associate Professor in the Physics department at University of Wisconsin - MilwaukeeMESH terms used to index this publication - Major topics in bold
AlgorithmsCastor Oil
Interferometry
Lasers
Olive Oil
Optics and Photonics
Plant Oils
Signal Processing, Computer-Assisted
Temperature
Ultrasonography
