TY  - CHAP
A1  - Dokhanchi, Najmeh Sadat
A1  - Arnold, Jörg
A1  - Vogel, Albert
A1  - Völker, Conrad
T1  - Acoustic Travel-Time Tomography: Optimal Positioning of Transceiver and Maximal Sound-Ray Coverage of the Room
T2  - Fortschritte der Akustik - DAGA 2019
N2  - 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.
KW  - Bauphysik
KW  - Acoustic Travel-Time Tomography
KW  - Bauklimatik
KW  - Akustische Tomographie
Y1  - 2019
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20190408-38778
UR  - https://www.dega-akustik.de/publikationen/online-proceedings/
N1  - This conference paper has been submitted to the DAGA 2019. Thus, the original paper first is published in the "Fortschritte der Akustik - DAGA 2019"
ER  -