Optical diffraction tomography of ultrasonic fields with algebraic reconstruction techniques

Author

Holm, Anders ; Persson, Hans W. ; Lindstrom, K.

Author_Institution

Dept. of Electr. Meas., Lund Inst. of Technol., Sweden

fYear

1990

fDate

4-7 Dec 1990

Firstpage

685

Abstract

The authors describe a light diffraction technique, optical diffraction tomography (ODT), which allows a measurement of ultrasonic pressure and phase in the cross-section of an ultrasonic beam. ODT measurements are based on the Raman-Nath equations describing the interaction between ultrasonic fields and light. The reconstruction of the measurement plane is done with algebraic reconstruction techniques (ARTs) combined with nearest-neighbor averaging. A limiting factor on reconstruction accuracy in tomography is the number of projections. With ART satisfactory results are obtained with 10 projections for both near- and far-field measurements. Measurements with different transducers at 2 and 3.5 MHz are presented. The measurements present pressure and phase-angle mappings. A comparison with hydrophone measurements is included

Keywords

acoustic field; acoustic imaging; acoustic intensity measurement; acoustic signal processing; acousto-optical devices; light diffraction; ultrasonic measurement; 2 MHz; 3.5 MHz; Raman-Nath equations; US beam cross-section; US phase; algebraic reconstruction techniques; far-field measurements; light diffraction technique; near-field measurement; nearest-neighbor averaging; optical diffraction tomography; phase-angle mappings; pressure mapping; transducers; ultrasonic fields; ultrasonic pressure; Art; Equations; Optical diffraction; Phase measurement; Pressure measurement; Sonar equipment; Subspace constraints; Tomography; Transducers; Ultrasonic variables measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1990. Proceedings., IEEE 1990

Conference_Location

Honolulu, HI

Type

conf

DOI

10.1109/ULTSYM.1990.171451

Filename

171451