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Versatile Air-Coupled Phased Array Transducer For Sensor Applications

Unger, Alexander and Konetzke, Eric and Rutsch, Matthias and Hoffmann, Maik and Ramadas, Nishal and Dixon, Steve and Kupnik, Mario (2015):
Versatile Air-Coupled Phased Array Transducer For Sensor Applications.
In: IEEE SENSORS 2015, Busan, Südkorea, 01.11.2015-04.11.2015, [Conference or Workshop Item]

Abstract

We introduce a versatile one–dimensional (1D) air–coupled phased array transducer device operating at 40 kHz. It allows both - transmit beam steered ultrasound at high sound pressure level and it can sense beam steered ultrasound. This device opens the door to many new sensory applications. Conventionally, low frequency sensor array design for air–coupled application was not possible due to the inter element spacing (also referred as pitch) criteria that needs to be satisfied for given applications. We overcome this limitation by introducing a smart packaging layer that separates the acoustic aperture from the actual radiating aperture of the ultrasonic transducer. By doing this, we ensure that the half wavelength criteria is fulfilled. The proposed new design leads to a wide operation range without any undesirable grating lobes. A proof of concept prototype device was built and its performance evaluated in the laboratory. An impressive 130 ± 1 dB sound pressure level (SPL) was observed at a distance of 1 m. The prototype also was capable of steering approximately 110◦ in total, in both transmit and receive mode of operation.

Item Type: Conference or Workshop Item
Erschienen: 2015
Creators: Unger, Alexander and Konetzke, Eric and Rutsch, Matthias and Hoffmann, Maik and Ramadas, Nishal and Dixon, Steve and Kupnik, Mario
Title: Versatile Air-Coupled Phased Array Transducer For Sensor Applications
Language: English
Abstract:

We introduce a versatile one–dimensional (1D) air–coupled phased array transducer device operating at 40 kHz. It allows both - transmit beam steered ultrasound at high sound pressure level and it can sense beam steered ultrasound. This device opens the door to many new sensory applications. Conventionally, low frequency sensor array design for air–coupled application was not possible due to the inter element spacing (also referred as pitch) criteria that needs to be satisfied for given applications. We overcome this limitation by introducing a smart packaging layer that separates the acoustic aperture from the actual radiating aperture of the ultrasonic transducer. By doing this, we ensure that the half wavelength criteria is fulfilled. The proposed new design leads to a wide operation range without any undesirable grating lobes. A proof of concept prototype device was built and its performance evaluated in the laboratory. An impressive 130 ± 1 dB sound pressure level (SPL) was observed at a distance of 1 m. The prototype also was capable of steering approximately 110◦ in total, in both transmit and receive mode of operation.

Uncontrolled Keywords: Phased Array, Air-Coupled, Grating lobes, Transmit, Receive, 40 kHz Ultrasound, Smart packaging layer, sound tubes, wave guides, Versatile
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 SENSORS 2015
Event Location: Busan, Südkorea
Event Dates: 01.11.2015-04.11.2015
Date Deposited: 04 Nov 2015 14:08
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