A1.3 - Detection of Coatings and Measurement of Coating Thickness on Technical Substrates using Surface Acoustic Waves in a Waveguide Configuration

Lindner, Gerhard; Schmitt, Martin; Schmidt, Katrin; Faustmann, H.; Krempel, S.; Schubert, J.

doi:10.5162/sensor09/v1/a1.3

Proceedings SENSOR 2009, Volume I 2009

DOI: 10.5162/sensor09/v1/a1.3

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A1.3 - Detection of Coatings and Measurement of Coating Thickness on Technical Substrates using Surface Acoustic Waves in a Waveguide Configuration

Gerhard Lindner¹,

Martin Schmitt²,

Katrin Schmidt³

et al.

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Cited by 3 publications

References 15 publications

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Monitoring of Soft Deposition Layers in Liquid-Filled Tubes with Guided Acoustic Waves Excited by Clamp-on Transducers

Tietze

Singer

Lasota

et al. 2018

Sensors

Self Cite

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The monitoring of liquid-filled tubes with respect to the formation of soft deposition layers such as biofilms on the inner walls calls for non-invasive and long-term stable sensors, which can be attached to existing pipe structures. For this task a method is developed, which uses an ultrasonic clamp-on device. This method is based on the impact of such deposition layers on the propagation of circumferential guided waves on the pipe wall. Such waves are partly converted into longitudinal compressional waves in the liquid, which are back-converted to guided waves in a circular cross section of the pipe. Validating this approach, laboratory experiments with gelatin deposition layers on steel tubes exhibited a distinguishable sensitivity of both wave branches with respect to the thickness of such layers. This allows the monitoring of the layer growth.

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Monitoring of Soft Deposition Layers in Liquid-Filled Tubes with Guided Acoustic Waves Excited by Clamp-on Transducers

Tietze

Singer

Lasota

et al. 2018

Sensors

Self Cite

View full text Add to dashboard Cite

show abstract

Acoustic Limescale Layer and Temperature Measurement in Ultrasonic Flow Meters

Landskron

Dotzer

Benkert

et al. 2022

Sensors

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Guided acoustic waves are commonly used in domestic water meters to measure the flow rate. The accuracy of this measurement method is affected by factors such as variations in temperature and limescale deposition inside of the pipe. In this work, a new approach using signals from different sound propagation paths is used to determine these quantities and allow for subsequent compensation. This method evaluates the different propagation times of guided Lamb waves in flow measurement applications. A finite element method-based model is used to identify the calibration curves for the device under test. The simulated dependencies on temperature and layer thickness are validated by experimental data. Finally, a test on simulated data with varying temperatures and limescale depositions proves that this method can be used to separate both effects. Based on these values, a flow measurement correction scheme can be derived that provides an improved resolution of guided acoustic wave-based flow meters.

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Detection of coatings within liquid-filled tubes and containers by mode conversion of leaky Lamb waves

Schmitt

Schmidt

Olfert

et al. 2013

J. Sens. Sens. Syst.

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Abstract. In this paper, a new acoustic sensor principle for coating detection within liquid-filled tubes and containers based on mode conversion of leaky Lamb waves is introduced. Leaky Lamb waves are excited and detected by single-phase transducers, which are attached on the outer side of a tube or container. By transmission time and amplitude measurements, coating formation within the liquid-filled tube and container is detected non-invasively. This new sensor principle is subdivided into the separate considerations of Lamb wave excitation, mode conversion and inverse mode conversion. The Lamb wave excitation by a single-phase transducer is visualized by scanning laser Doppler vibrometer imaging. The mode conversion process of leaky Lamb waves is measured by membrane hydrophone measurements and Schlieren visualization; afterwards, the measured emission angles are compared with the theoretical one. The inverse mode conversion process of pressure waves back to leaky Lamb waves is visualized by Schlieren images. By merging the results of Lamb wave excitation, mode conversion and inverse mode conversion, the new sensor concept is explained. Theoretical considerations and measurement results of adhesive tape coating inside a liquid-filled plastic tube and a liquid-filled stainless steel container verify the new acoustic sensor principle. Finally the measuring sensitivity and the technical realization are discussed.

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A1.3 - Detection of Coatings and Measurement of Coating Thickness on Technical Substrates using Surface Acoustic Waves in a Waveguide Configuration

Cited by 3 publications

References 15 publications

Monitoring of Soft Deposition Layers in Liquid-Filled Tubes with Guided Acoustic Waves Excited by Clamp-on Transducers

Monitoring of Soft Deposition Layers in Liquid-Filled Tubes with Guided Acoustic Waves Excited by Clamp-on Transducers

Acoustic Limescale Layer and Temperature Measurement in Ultrasonic Flow Meters

Detection of coatings within liquid-filled tubes and containers by mode conversion of leaky Lamb waves

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