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Open Access Green as soon as Postprint is submitted to ZB.
Optoacoustic methods for frequency calibration of ultrasonic sensors.
IEEE Trans. Ultrason. Ferroelectr. Freq. Control. 58, 316-326 (2011)
The frequency response of ultrasonic detectors is commonly calibrated by finding their sensitivity to incident plane waves at discrete frequencies. For certain applications, such as the emerging field of optoacoustic tomography, it is the response to point sources emitting broadband spectra that needs to be found instead. Although these two distinct sensitivity characteristics are interchangeable in the case of a flat detector and a point source at infinity, it is not the case for detectors with size considerably larger than the acoustic wavelength of interest or those having a focused aperture. Such geometries, which are common in optoacoustics, require direct calibration of the acoustic detector using a point source placed in the relevant position. In this paper, we report on novel cross-validating optoacoustic methods for measuring the frequency response of wideband acoustic sensors. The approach developed does not require pre-calibrated hydrophones and therefore can be readily adopted in any existing optoacoustic measurement configuration. The methods are successfully confirmed experimentally by measuring the frequency response of a common piezoelectric detector having a cylindrically focused shape.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
optical interferometry; in-vivo; hydrophones; tomography; reciprocity
Language
english
Publication Year
2011
HGF-reported in Year
2011
ISSN (print) / ISBN
0885-3010
e-ISSN
1525-8955
Quellenangaben
Volume: 58,
Issue: 2,
Pages: 316-326
Publisher
Institute of Electrical and Electronics Engineers (IEEE)
Publishing Place
IEEE-Inst. Electrical Electronics Engineers Inc.
Reviewing status
Peer reviewed
Institute(s)
Institute of Biological and Medical Imaging (IBMI)
POF-Topic(s)
30205 - Bioengineering and Digital Health
Research field(s)
Enabling and Novel Technologies
PSP Element(s)
G-505500-001
PubMed ID
21342817
Erfassungsdatum
2011-05-16