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Extending the receive performance of phased micromachined ultrasonic transducer arrays in air down to 40 kHz and below

Rutsch, Matthias and Konetzke, Eric and Unger, Alexander and Hoffmann, Maik and Ramadas, Nishal and Dixon, Steve and Kupnik, Mario (2015):
Extending the receive performance of phased micromachined ultrasonic transducer arrays in air down to 40 kHz and below.
In: IEEE IUS 2015, Taipei, Taiwan, 21.10.2015-24.10.2015, [Conference or Workshop Item]

Abstract

We present a versatile ultrasonic one– dimensional (1D) air–coupled phased array transducer with a focus on its receive performance. In addition to its beam steering capability in transmit mode, it can be used to listen to ultrasonic waves at 40 kHz and below. We fulfill the half–wavelength criteria for the element spacing by introducing an additional layer, consisting of many tapered sound tubes (waveguides). These sound tubes separate the effective acoustic aperture from the actual receiving aperture of several ultrasonic transducers. This ensures that the array is not affected by grating lobes over a wide range of steering angles, and, thus, the array is capable of receiving directed ultrasound with only one primary receive direction for an adjustable angle (receive– beam forming). Based on this approach, we built and characterized a proof–of–concept prototype device. Our results prove that the array is able to receive ultrasonic waves over a wide range of 110◦ in total, with a receive sensitivity of −55.9 dB (0 dB equal 1 V/Pa). Thus, the device has huge potential for new sensory applications and the approach is compatible with micromachined ultrasonic transducers as well.

Item Type: Conference or Workshop Item
Erschienen: 2015
Creators: Rutsch, Matthias and Konetzke, Eric and Unger, Alexander and Hoffmann, Maik and Ramadas, Nishal and Dixon, Steve and Kupnik, Mario
Title: Extending the receive performance of phased micromachined ultrasonic transducer arrays in air down to 40 kHz and below
Language: English
Abstract:

We present a versatile ultrasonic one– dimensional (1D) air–coupled phased array transducer with a focus on its receive performance. In addition to its beam steering capability in transmit mode, it can be used to listen to ultrasonic waves at 40 kHz and below. We fulfill the half–wavelength criteria for the element spacing by introducing an additional layer, consisting of many tapered sound tubes (waveguides). These sound tubes separate the effective acoustic aperture from the actual receiving aperture of several ultrasonic transducers. This ensures that the array is not affected by grating lobes over a wide range of steering angles, and, thus, the array is capable of receiving directed ultrasound with only one primary receive direction for an adjustable angle (receive– beam forming). Based on this approach, we built and characterized a proof–of–concept prototype device. Our results prove that the array is able to receive ultrasonic waves over a wide range of 110◦ in total, with a receive sensitivity of −55.9 dB (0 dB equal 1 V/Pa). Thus, the device has huge potential for new sensory applications and the approach is compatible with micromachined ultrasonic transducers as well.

Uncontrolled Keywords: Phased Array, Air-Coupled, Grating lobes, Receive, CMUT, 40 kHz Ultrasound
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 13:45
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