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A multi-parameter decoupling method with a Lamb wave sensor for improving the selectivity of label-free liquid detection.

Zhou L, Wu Y, Xuan M, Manceau JF, Bastien F - Sensors (Basel) (2012)

Bottom Line: We found they can play very different roles in the detections.Here, the A(0) mode is used to identify the density of the detected liquid and with this density value we obtained the viscosity by the amplitude shifts of the S(0) mode.This could be a way to distinguish an unknown liquid with high sensitivity or to solve the problem of selectivity of label-free detection on biosensors.

View Article: PubMed Central - PubMed

Affiliation: Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou 215163, China. zhoulq@sibet.ac.cn

ABSTRACT
In this paper, a liquid multi-parameter decoupling method with only one Lamb wave sensor is presented. In a Lamb wave sensor, antisymmetric modes (A(01) mode for low frequency, A(03) mode for high frequency) and symmetric modes (S(0) mode) are used to detect multiple parameters of a liquid, such as its density, sound velocity, and viscosity. We found they can play very different roles in the detections. For example, the A(01) mode is very sensitive to the liquid's density but the A(03) mode is sensitive to the sound velocity. Here, the A(0) mode is used to identify the density of the detected liquid and with this density value we obtained the viscosity by the amplitude shifts of the S(0) mode. This could be a way to distinguish an unknown liquid with high sensitivity or to solve the problem of selectivity of label-free detection on biosensors.

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Related in: MedlinePlus

The system for liquid detection, (a) Schematic diagram of the micro Lamb wave sensor interaction with liquid, ρL: density, cL: sound velocity, ηL: viscosity; (b) Micro Lamb wave sensor packaged with printed circuit board (PCB).
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f1-sensors-12-10369: The system for liquid detection, (a) Schematic diagram of the micro Lamb wave sensor interaction with liquid, ρL: density, cL: sound velocity, ηL: viscosity; (b) Micro Lamb wave sensor packaged with printed circuit board (PCB).

Mentions: The micro Lamb wave device in Figure 1(a) contains a silicon membrane (length 7.8 mm, thickness ∼12 μm) with a ground layer (Ti/Mo, GND, ∼0.2 μm) and a piezoelectric layer (aluminum nitride, AlN, ∼1.8 μm). Lamb waves are excited and detected directly using bidirectional inter-digital transducers (IDTs) [33] located on the surface of the AlN layer. There are six pairs of fingers on bidirectional IDTs in each exciting and detecting transducer. The period of bidirectional IDT is about 400 μm. As waves are partly reflected at the end of length-limited membrane (∼7.8 mm), the device has strong signal without reflectors on both ends of the membrane. With the layers described as in [34], the mass per unit area of the membrane (M) is about 0.0355 kg/m2.


A multi-parameter decoupling method with a Lamb wave sensor for improving the selectivity of label-free liquid detection.

Zhou L, Wu Y, Xuan M, Manceau JF, Bastien F - Sensors (Basel) (2012)

The system for liquid detection, (a) Schematic diagram of the micro Lamb wave sensor interaction with liquid, ρL: density, cL: sound velocity, ηL: viscosity; (b) Micro Lamb wave sensor packaged with printed circuit board (PCB).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3472832&req=5

f1-sensors-12-10369: The system for liquid detection, (a) Schematic diagram of the micro Lamb wave sensor interaction with liquid, ρL: density, cL: sound velocity, ηL: viscosity; (b) Micro Lamb wave sensor packaged with printed circuit board (PCB).
Mentions: The micro Lamb wave device in Figure 1(a) contains a silicon membrane (length 7.8 mm, thickness ∼12 μm) with a ground layer (Ti/Mo, GND, ∼0.2 μm) and a piezoelectric layer (aluminum nitride, AlN, ∼1.8 μm). Lamb waves are excited and detected directly using bidirectional inter-digital transducers (IDTs) [33] located on the surface of the AlN layer. There are six pairs of fingers on bidirectional IDTs in each exciting and detecting transducer. The period of bidirectional IDT is about 400 μm. As waves are partly reflected at the end of length-limited membrane (∼7.8 mm), the device has strong signal without reflectors on both ends of the membrane. With the layers described as in [34], the mass per unit area of the membrane (M) is about 0.0355 kg/m2.

Bottom Line: We found they can play very different roles in the detections.Here, the A(0) mode is used to identify the density of the detected liquid and with this density value we obtained the viscosity by the amplitude shifts of the S(0) mode.This could be a way to distinguish an unknown liquid with high sensitivity or to solve the problem of selectivity of label-free detection on biosensors.

View Article: PubMed Central - PubMed

Affiliation: Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou 215163, China. zhoulq@sibet.ac.cn

ABSTRACT
In this paper, a liquid multi-parameter decoupling method with only one Lamb wave sensor is presented. In a Lamb wave sensor, antisymmetric modes (A(01) mode for low frequency, A(03) mode for high frequency) and symmetric modes (S(0) mode) are used to detect multiple parameters of a liquid, such as its density, sound velocity, and viscosity. We found they can play very different roles in the detections. For example, the A(01) mode is very sensitive to the liquid's density but the A(03) mode is sensitive to the sound velocity. Here, the A(0) mode is used to identify the density of the detected liquid and with this density value we obtained the viscosity by the amplitude shifts of the S(0) mode. This could be a way to distinguish an unknown liquid with high sensitivity or to solve the problem of selectivity of label-free detection on biosensors.

Show MeSH
Related in: MedlinePlus