Dynamic Pressure Measurement Using Two-Frequency Ultrasound

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Abstract
To perform non-invasive pressure measurement by ultrasound, we examined the acoustic characteristics of microcapsules which are dependent on the surrounding pressure. The linear amplitude change of frequency spectrum by pressure was used to develop a fast pressure measurement method. To determine the correspondence of the spectrum amplitude with pressure, we defined a twin frequency attenuation ratio (TAR) as a new pressure parameter measured by two-frequency ultrasound. Dynamic change of pressure was experimentally detected by TAR, whose sensitivity for ultrasonic pressure measurement was thus indicated.

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