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Acoustic Travel-Time Tomography: Optimal Positioning of Transceiver and Maximal Sound-Ray Coverage of the Room

  • Acoustic travel-time tomography (ATOM) determines the distribution of the temperature in a propagation medium by measuring the travel-time of acoustic signals between transmitters and receivers. To employ ATOM for indoor climate measurements, the impulse responses have been measured in the climate chamber lab of the Bauhaus-University Weimar and compared with the theoretical results of its image source model (ISM). A challenging task is distinguishing the reflections of interest in the reflectogram when the sound rays have similar travel-times. This paper presents a numerical method to address this problem by finding optimal positions of transmitter and receiver, since they have a direct impact on the distribution of travel times. These optimal positions have the minimum number of simultaneous arrival time within a threshold level. Moreover, for the tomographic reconstruction, when some of the voxels remain empty of sound-rays, it leads to inaccurate determination of the air temperature within those voxels. Based on the presented numerical method, the number of empty tomographic voxels are minimized to ensure the best sound-ray coverage of the room. Subsequently, a spatial temperature distribution is estimated by simultaneous iterative reconstruction technique (SIRT). The experimental set-up in the climate chamber verifies the simulation results.

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Document Type:Conference Proceeding
Author:M.Sc. Najmeh Sadat Dokhanchi, Dipl.-Ing. Jörg Arnold, Dr.-Ing. Albert VogelGND, Prof. Dr.-Ing. Conrad VölkerGND
DOI (Cite-Link):https://doi.org/10.25643/bauhaus-universitaet.3877Cite-Link
URN (Cite-Link):https://nbn-resolving.org/urn:nbn:de:gbv:wim2-20190408-38778Cite-Link
Parent Title (Multiple languages):Fortschritte der Akustik - DAGA 2019
Date of Publication (online):2019/03/31
Date of first Publication:2019/03/31
Release Date:2019/04/08
Publishing Institution:Bauhaus-Universität Weimar
Institutes:Fakultät Bauingenieurwesen / Professur Bauphysik
Tag:Acoustic Travel-Time Tomography
GND Keyword:Bauphysik; Bauklimatik; Akustische Tomographie
Dewey Decimal Classification:600 Technik, Medizin, angewandte Wissenschaften / 620 Ingenieurwissenschaften / 621 Angewandte Physik
BKL-Classification:56 Bauwesen / 56.55 Bauphysik, Bautenschutz
Licence (German):License Logo Zweitveröffentlichung
This conference paper has been submitted to the DAGA 2019. Thus, the original paper first is published in the "Fortschritte der Akustik - DAGA 2019"