Matthias Rutsch

Matthias Rutsch
Technische Universität Darmstadt | TU · Department of Electrical Engineering and Information Technology (Dept.18)

Master of Science

About

25
Publications
2,714
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114
Citations

Publications

Publications (25)
Data
A rotating view of the CAD-Data of the Experimental Setup in "Multipath Flow Metering of High-Velocity Gas Using Ultrasonic Phased-Arrays"
Article
Full-text available
Sparse spiral phased arrays are advantageous for many emerging air-coupled ultrasonic applications, since grating lobes are prevented without being constrained to the half-wavelength element spacing requirement of well-known dense arrays. As a result, the limitation on the maximum transducer diameter is omitted and the aperture can be enlarged for...
Article
Full-text available
In this work we combine a multipath ultrasonic gas flow meter (UFM) with an ultrasonic air-coupled phased-array. This allows complementing the advantages of a multipath UFM, i.e. higher accuracy and more robustness to irregular flow, with the extended velocity measuring range due to sound drift compensation via a phased-array. We created a 3D-print...
Article
Waveguides allow grating lobe free beamforming for air-coupled ultrasonic phased-arrays by reducing the effective inter-element spacing to half wavelength. Since the sound waves propagate through the waveguide ducts, additional time delays are introduced. In this work, we present analytical, numerical, and experimental methods to estimate these tim...
Conference Paper
Full-text available
Ferroelectrets are typical cellular polymer foams that exhibit high flexibility and an excellent matching to air. Recently, biodegradable cellular polylactic acid (PLA) ferroelectrets have been introduced, exhibiting a large longitudinal piezoelectric coefficient. In this work, we present a combination of a PLA film and a printed PLA backplate usin...
Article
Ultrasound propagation in liquids is highly influenced by its attenuation due to viscous damping. The dissipated energy will be partially absorbed by the liquid due to its dynamic viscosity as well as its bulk viscosity. The former results in the generation of a flow that is called acoustic streaming, and the latter is associated with the vibration...
Conference Paper
Air-coupled ultrasonic sonar systems are a valuable complement to lidar sensors for safe navigation of autonomous vehicles, especially in environments with optically transparent and reflective surfaces. Consequently, sonar systems based on phased arrays and beamforming are a promising compact solution, providing precise and unambiguous 3D localizat...
Conference Paper
Spiral-shaped phased arrays are widely used for sound source localization and are trending in other fields, e.g. 3D medical ultrasound imaging. The non-uniform element geometry allows grating lobe free beamforming without an inter-element spacing of half wavelength. We demonstrate the 3D imaging capabilities of an air-coupled ultrasonic 40-kHz phas...
Conference Paper
Schlieren photography is widely used for visualiza-tion of acoustic or shock waves, e.g. in ballistics and aerodynamics. Due to the low molar refractivity of air the visualization of acoustic waves requires sensitive equipment or high sound pressure levels. We present a Schlieren system utilized in a non-destructive test setup, that is capable to v...
Article
We present an air-coupled ultrasonic imaging system based on a 40 kHz 8×8 phased-array for three-dimensional real-time localization of multiple objects in the far-field. By attaching a waveguide to the array, the effective inter-element spacing is reduced to half wavelength. This enables grating lobe free transmit and receive beamforming with a uni...
Conference Paper
We present a simulation of an ultrasonic transducer element with piezoelectric and electrostatic transduction combined and with two bending plates. It combines the high SPL of a piezoelectric transducer with the tunable resonance frequency of a CMUT due to spring softening effect. In this work, we compare two state-of-the-art transducers with our a...
Conference Paper
Full-text available
We present a three-dimensional far-field imaging method using an air-coupled 40 kHz 8×8 ultrasound phased-array. A waveguide is attached to the array which reduces the aperture to 35 mm×35 mm and the inter-element spacing to λ /2 for grating lobe free beamforming. Using transmit beamforming, a pulse echo detection is performed sequentially for each...
Conference Paper
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 freque...
Conference Paper
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 st...
Conference Paper
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 addition...

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