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Sensors 2018, 18(2), 526; https://doi.org/10.3390/s18020526

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

Institute of Sensor and Actuator Technology, Coburg University of Applied Sciences and Arts, Am Hofbräuhaus 1b, 96450 Coburg, Germany
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Received: 29 November 2017 / Revised: 1 February 2018 / Accepted: 8 February 2018 / Published: 9 February 2018
(This article belongs to the Section Physical Sensors)
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Abstract

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. View Full-Text
Keywords: biofilms; deposition layers; liquid-filled tubes; clamp-on transducers; guided acoustic waves biofilms; deposition layers; liquid-filled tubes; clamp-on transducers; guided acoustic waves
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Tietze, S.; Singer, F.; Lasota, S.; Ebert, S.; Landskron, J.; Schwuchow, K.; Drese, K.S.; Lindner, G. Monitoring of Soft Deposition Layers in Liquid-Filled Tubes with Guided Acoustic Waves Excited by Clamp-on Transducers. Sensors 2018, 18, 526.

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