Estimation of the spatial impulse response of an ultrasonic transducer using a tomographic approach
1995 (English)In: Journal of the Acoustical Society of America, ISSN 0001-4966, E-ISSN 1520-8524, Vol. 98, no 4, 2094-2103 p.Article in journal (Refereed) Published
The impulse response method is often used to study the ultrasonic field radiated by planar or gently curved transducers. These investigations can be extended to include the reflected echoes from point reflectors, which can be used in syntesizing echoes from reflectors of known shapes. The single point echo can be measured directly but there are however certain problems associated with this. This paper proposes an alternative method to estimate the echo from a point-like reflector by measuring the echoes from sliding halfplanes. Using a tomographic approach, the single point echo is estimated from these measurements. To perform the tomographic inversion, a truncated weighted Singular Value Decomposition (SVD) is used in order to catch essential features of the ultrasonic echoes, where the weight functions are chosen specially to suit our application. Numerical solutions are given for the chosen weight functions and an error analysis is carried out.
Place, publisher, year, edition, pages
1995. Vol. 98, no 4, 2094-2103 p.
Research subject Signal Processing
IdentifiersURN: urn:nbn:se:ltu:diva-6545Local ID: 4c5dc5e0-799a-11db-8824-000ea68e967bOAI: oai:DiVA.org:ltu-6545DiVA: diva2:979431
Godkänd; 1995; 20060929 (ysko)2016-09-292016-09-29Bibliographically approved