Chemical and Biological Sensors

Ballantine, David S.; Martin, Stephen J.; Ricco, Antonio J.; Frye, G.C.; Wohltjen, H.; White, Richard M.; Zellers, Edward T.

doi:10.1016/b978-012077460-9/50005-8

Cited by 130 publications

(216 citation statements)

References 229 publications

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“…Before, only non-leaky Lamb wave (Lohr and Rose, 2003) on non-piezoelectric substrates or shear horizontal waves on piezoelectric substrates (Balantine et al, 1997;Thomson and Stone, 1997) were investigated, because it was thought that bulk acoustic waves or surface acoustic waves with a dominant vertical displacement would be inapplicable for coating detection in a liquid environment (Länge et al, 2008;Calabrese et al, 1987).…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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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“…Theoretically surface acoustic wave sensors (SAWs) categorized in microelectromechanical systems (MEMS) which depend on the modulation of acoustic surface to detect a physical phenomenon. Microelectromechanical systems (MEMS) are one of the areas that are widely used for gas sensing purpose, because of the advantages it brings in efficiency, robustness and cost effectiveness [1,2]. By introducing ethylene gaseous as an input to the sensors, receiver will receives and transduces input into a mechanical wave [1].…”

Section: Introductionmentioning

confidence: 99%

“…Microelectromechanical systems (MEMS) are one of the areas that are widely used for gas sensing purpose, because of the advantages it brings in efficiency, robustness and cost effectiveness [1,2]. By introducing ethylene gaseous as an input to the sensors, receiver will receives and transduces input into a mechanical wave [1]. The sensor then transduces again the mechanical wave into electrical signal.…”

Section: Introductionmentioning

confidence: 99%

Design and Development of ZnO Based Gas Sensor for Fruit Ripening Detection

et al. 2016

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Abstract. This work focuses on the nondestructive fruit ripeness detection system at different maturity stages. The study involved a computational approach whereby the detector is simulated and characterized. The development of the 2 dimensional finite elements provides deeper understanding in an isotropic media of the sensor. The paper presents a sensitive layer of the zinc oxide with a thickness of 0.5 µm on LiNbO3 piezoelectric substrate for ethylene (C2H4) gas sensing application in order to distinguish maturity level of fruits. In addition the sensor acts as a better device for sensing the amount of ethylene gases that releases from mature fruits.

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“…Visualization of sound or pressure field propagation in gases, fluids, or transparent media is of major interest, with applications in a diverse range of topics, including acoustic transducer design [1,2], noise source identification [3], insect hearing [4], effects of elastic waves and strain in solid materials [5,6], and material and chemical identification [7,8].…”

Section: Introductionmentioning

confidence: 99%

Imaging of acoustic fields using optical feedback interferometry

Bertling¹,

Perchoux²,

Taimre³

et al. 2014

Opt. Express

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This is the final published version of the article (version of record). It first appeared online via OSA at https://www.osapublishing.org/oe/abstract.cfm?uri=oe-22-24-30346. Please refer to any applicable terms of use of the publisher. University of Bristol -Explore Bristol Research General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Abstract:This study introduces optical feedback interferometry as a simple and effective technique for the two-dimensional visualisation of acoustic fields. We present imaging results for several pressure distributions including those for progressive waves, standing waves, as well as the diffraction and interference patterns of the acoustic waves. The proposed solution has the distinct advantage of extreme optical simplicity and robustness thus opening the way to a low cost acoustic field imaging system based on mass produced laser diodes.

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Chemical and Biological Sensors

Cited by 130 publications

References 229 publications

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

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

Design and Development of ZnO Based Gas Sensor for Fruit Ripening Detection

Imaging of acoustic fields using optical feedback interferometry

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