Tomographic imaging of the inclining vortex air flow field using parallely faced acoustic arrays
For the monitoring of the strong vortex wind field like a tornado, an acoustic tomographic technique for the reconstruction of two-dimensional vortex air flow profile was demonstrated. To this end, acoustic sparse array elements were placed along the opposite sides of monitoring rectangular region. Travel times of the acoustic waves through the region were then measured along the parallel paths between the facing pair of array elements. Particularly, tomographic method was examined to reconstruct the inclining vortex wind field based on the vector field Fourier central slice theorem. To make it possible, wind field was assumed to be the superposition of vortex flow in the transversal plane and vertical axial flow, anti-symmetric vortex flow component was then extracted from the travel time difference data along observation axis. By this means, ill-posed problem caused by the lack of the view data was overcome and non-inclining part of the vortex wind field was reconstructed. Test examinations were carried out using the indoor model equipment with the 10-channel bidirectional ultrasonic transmitter/receiver circuit. As a result, it was demonstrated that precisions of the estimated vortex parameters (maximum vortex airflow speed and size) were satisfactory which justifies the feasibility of the present method.
Haiyue Li Akira Yamada
Bioapplicat.and Systems Engineering,Tokyo University of Agriculture & Technology,Nakamachi 2-24-16,Koganei,Tokyo,184-8588,Japan
国际会议
The 10th Western Pacific Acoustics Conference(第十届西太平洋声学会议WESPAC X)
北京
英文
1-6
2009-09-21（万方平台首次上网日期，不代表论文的发表时间）