Jan Hinrichs

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

Master of Science
Non destructive, non contact testing of sheet materials using aircoupled Lamb waves

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17
Publications
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70
Citations

Publications

Publications (17)
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
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
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...

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