Application of Light Refractive Tomography for Reconstructing Ultrasound Fields in Various Media

Abstract

This paper describes an optical measurement technique, referred to as light refractive tomography (LRT), which enables noninvasive measurement of ultrasound pressure fields in water. The pressure field arising from a cylindrically focused ultrasound transducer is measured separately by means of LRT and hydrophone. Good agreement is achieved between the results obtained by these two different methods. After that, LRT is extended and applied to the reconstruction of density variations in a PMMA block induced by ultrasound. The results appear plausible, however, a quantitative verification is currently still missing, since we know of no other published methods succeeding so far in the measurement of density change in solids induced by ultrasound.