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Publikationen von Professorinnen und Professoren der HAW Hamburg

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Alle : 101, ... , 2003, 2004, 2005, ... , 2020
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2020

Zeitschriftenbeiträge:

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Said Ali El-Busaidy, Bernd Baumann, Marcus Wolff und Lars Duggen
Modelling of open photoacoustic resonators
Photoacoustics, 18
2020

Marker: TI-MP

Zusammenfassung: Photoacoustic spectroscopy employs acoustic resonators for signal amplification. Resonators are usually closed, however, in some applications, open resonators are preferred. The opening deteriorates the photoacoustic signal hence reducing the sensitivity of the photoacoustic measurement. We present two new approaches for simulating the photoacoustic signal in open resonators using finite element modelling. The approaches are based on the amplitude mode expansion model and the viscothermal model with the opening modelled using perfectly matched layers and the boundary element method respectively. Additionally, the performance of the viscothermal model using perfectly matched layers for simulating open resonators is extended to the ultrasound region. The simulation results are verified by comparing them to photoacoustic measurements. The approaches provide an accurate basis for designing and optimizing open resonators with high sensitivity.

2019

Zeitschriftenbeiträge:

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Levin Schilling und Peter Dalhoff
Piezoelectric Patch Transducers: Can alternative sensors enhance bearing failure prediction?
Journal of Physics: Conference Series, 1356(012015)
25 Oktober 2019
English

Marker: TI-M+P

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Said El-Busaidy, Bernd Baumann, Marcus Wolff, Lars Duggen und Henry Bruhns
Experimental and Numerical Investigation of a Photoacoustic Resonator for Solid Samples: Towards a Non-Invasive Glucose Sensor
Sensors, 19(13)
29 Juni 2019

Marker: TI-MP

Zusammenfassung: T-cell resonators have been used lately for non-invasive blood glucose measurements for photoacoustic spectroscopy on skin samples. A resonator has a significant role in determining the strength of the measured signal and the overall sensitivity of the sensor. Here we present results of the measurement of the photoacoustic signal of such a T-cell resonator. The signal is also modelled using the amplitude mode expansion method, which is based on eigenmode expansion and the introduction of losses in the form of loss factors. The measurement reproduced almost all the calculated resonances from the numerical models with fairly good agreement. The cause of the differences between the measured and the simulated resonances are explained. In addition, the amplitude mode expansion simulation model is established as a faster and computationally less demanding photoacoustic simulation alternative to the viscothermal model. The resonance frequencies from the two models differ by less than 1.8%. It is noted that the relative height of the amplitudes from the two models depends on the location of the antinodes within the different parts of the resonator. The amplitude mode expansion model provides a quick simulation tool for the optimization and design of macro resonators.

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Levin Schilling und Peter Dalhoff
Piezoelectric Patch Transducers: Can alternative sensors enhance bearing failure prediction?
Journal of Physics: Conference Series,
2019
akzeptiert

Marker: TI-MP

Plakate:

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Said El-Busaidy, Bernd Baumann, Marcus Wolff und Lars Duggen
Modelling of an open photoacoustic resonator for blood glucose measurements
11 Juli 2019
ICPPP 2019

Marker: TI-MP

Konferenz-/Workshop-/Podiumsdiskussionsbeiträge, Ausstellungs-/Modenschaubeteiligungen:

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Sven Störtenbecker, Rudolf Anselm und Peter Dalhoff
Projekt X-Rotor: Mit Multirotoren zur 20 MW Turbine
Husum Wind 2019
Husum, Deutschland
11 September 2019

Marker: TI-MP

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Sven Störtenbecker, Mukunda Tamang und Peter Dalhoff
Simplified support structure design for multi rotor wind turbine systems
Wind Energy Science Conference (WESC) 2019
Cork, Irland
19 Juni 2019
English

Marker: TI-MP

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Inga Reinwardt, Levin Schilling, Peter Dalhoff, Dirk Steudel und Michael Breuer
Measuring Dynamic Wake Characteristics with Nacelle Mounted LiDAR Systems
WESC 2019
17 Juni 2019
Englisch

Marker: TI-MP

pdf
Levin Schilling und Peter Dalhoff
Piezoelectric Patch Transducers: Can alternative sensors enhance bearing failure prediction?
EERA Deepwind'19
Trondheim, Norway
17 Januar 2019
English

Schlüsselwörter: sensor technologies, piezoelectric patch transducers, condition monitoring, wind energy

Marker: TI-MP

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Said El-Busaidy, Bernd Baumann, Marcus Wolff und Lars Duggen
Modeling the photoacoustic signal of an open resonator
Comsol User Day
2019

Marker: TI-MP

Zusammenfassung: Photoacoustic sensors are well established for the detection of substances of small concentrations. Ordinarily these sensors make use of closed acoustic resonators for signal enhancement. Due to special requirements for certain applications we we need to consider an acoustic resonator with an opening. In the presentation we give an account of the challenges this bears for the simulation of the photoacoustic signal.

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Letzte Änderung: 23.01.15

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