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We present a fully-populated 2D-phased array, capable of emitting directed air-coupled ultrasound at 40 kHz without any grating lobes. In comparison to our previous work [Konetzke et al, IUS 2015], in which we describe a 1D-phased array, we use 3D printing techniques to realize a wave guide structure that fulfills the half-wavelength criteria of 4.3 mm. The key idea is to use the wave-guide structure...
We present a fully-populated 8×8 2D-phased array, capable of emitting directed air-coupled ultrasound at 40 kHz with λ/2-pitch size for zero grating lobes. In comparison to our previous work, in which we describe a 1D-phased array, we use 3D-printing to realize the wave guide structure. Besides the key idea to separate the vibrating from the acoustic aperture, the 3D-printing approach allows implementing...
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...
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)...
We introduce an ultrasonic one-dimensional (1D) air-coupled phased array transducer, operating at 40 kHz without any grating lobes. It is well known, that this achievement is only possible when each transducer element is small enough for an element pitch that is equal to or less than half of the wavelength, i.e. ≤ 4.3 mm for 40 kHz operation frequency. As far as we know, conventionally low frequency...
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,...
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