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Diffraction loss calculation based on boundary element method for an air-coupled phased array

Golinske, René and Hoffmann, Maik and Konetzke, Eric and Unger, Alexander and Rutsch, Matthias and Kupnik, Mario (2015):
Diffraction loss calculation based on boundary element method for an air-coupled phased array.
In: IEEE IUS 2015, Taipei, Taiwan, 21.10.2015-24.10.2015, [Conference or Workshop Item]

Abstract

We present an efficient numerical method to analyze the diffraction loss of an ultrasonic air–coupled phased array transducer to an arbitrary located receiving aperture. The objective is the efficient calculation of diffraction loss for applications in which such an array is excited with arbitrary input signals on all channels for different beam steering angles. Available software, such as Field II, provide the pressure field in front of the phased transducer array, i.e. they assume a point source receiver. Our calculation method, however, is focused on directly calculating the diffraction loss to a given receiving aperture, such as a microphone or a receiving transducer, with arbitrary location and orientation. The boundary element method (BEM) is used for an efficient calculation. The entire model is implemented in the commercially avail- able software package Mathematica V10 from Wolfram Research. Excellent agreement between calculation results and microphone measurements validate the approach. For future work, we will use this model for further optimizing the development of high-performance air-coupled phased array transducer designs.

Item Type: Conference or Workshop Item
Erschienen: 2015
Creators: Golinske, René and Hoffmann, Maik and Konetzke, Eric and Unger, Alexander and Rutsch, Matthias and Kupnik, Mario
Title: Diffraction loss calculation based on boundary element method for an air-coupled phased array
Language: English
Abstract:

We present an efficient numerical method to analyze the diffraction loss of an ultrasonic air–coupled phased array transducer to an arbitrary located receiving aperture. The objective is the efficient calculation of diffraction loss for applications in which such an array is excited with arbitrary input signals on all channels for different beam steering angles. Available software, such as Field II, provide the pressure field in front of the phased transducer array, i.e. they assume a point source receiver. Our calculation method, however, is focused on directly calculating the diffraction loss to a given receiving aperture, such as a microphone or a receiving transducer, with arbitrary location and orientation. The boundary element method (BEM) is used for an efficient calculation. The entire model is implemented in the commercially avail- able software package Mathematica V10 from Wolfram Research. Excellent agreement between calculation results and microphone measurements validate the approach. For future work, we will use this model for further optimizing the development of high-performance air-coupled phased array transducer designs.

Uncontrolled Keywords: Phased Array, Air-Coupled, Diffraction loss, 40 kHz Ultrasound, BEM, Boundary Element Method
Divisions: 18 Department of Electrical Engineering and Information Technology > Institute for Electromechanical Design
18 Department of Electrical Engineering and Information Technology > Institute for Electromechanical Design > Measurement and Sensor Technology
18 Department of Electrical Engineering and Information Technology
Event Title: IEEE IUS 2015
Event Location: Taipei, Taiwan
Event Dates: 21.10.2015-24.10.2015
Date Deposited: 04 Nov 2015 13:44
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