6.4 - Validierung der tomographischen Rekonstruktion eines neuartigen akustischen Sensorsystems zur Bestimmung von Gasgehaltsverteilungen in Mehrphasensystemen

Elfering, M.; Annas, S.; Czajka, H.; Jantzen, H.-A.; Janoske, U.

doi:10.5162/16dss2022/6.4

Cited by 1 publication

(1 citation statement)

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“…Furthermore, gas holdup determination in bubbly liquids via acoustic transmission tomography (GHATT) is the subject of current research. Elfering et al [10,11] utilize the dependency of sound velocity on volumetric gas content in GHATT. This dependency, first described mathematically by Wood [12], is valid for the socalled subcritical frequency range (i.e.…”

Section: Introductionmentioning

confidence: 99%

Method for time-of-flight estimation of low frequency acoustic signals in reverberant and noisy environment with sparse impulse response

Elfering¹,

Annas²,

Jantzen³

et al. 2022

Meas. Sci. Technol.

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For acoustic procedures which rely on the speed of sound to derive process parameters, the determination of the acoustic time of flight is essential. In this work, a method for the determination of the time of flight (TOF) is presented. It is intended for reverberant and noisy environments and can be applied in the gas holdup determination in bubbly liquids via acoustic transmission tomography (GHATT) for example. The method includes the selection and design of the transmitted signal to optimize the disambiguate of the autocorrelation, the narrowing of the time window based on the Fractional Fourier Transform (FrFT) to accelerate the TOF estimation. Furthermore, it includes the consideration of the system-induced signal distortion through prior quasi-anechoic measurements and the sparse reconstruction of the spatial impulse response for TOF estimation using non-negative sparse deconvolution algorithms. The method is tested analytically on numerically generated signals and various sparse deconvolution algorithms are investigated with respect to their applicability and limitations.

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Section: Introductionmentioning

confidence: 99%