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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

Relative frequency shifts (Δf/f) for the A01 mode, the A03 mode, and the S0 mode in the measurements of the NaCl solutions.
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f3-sensors-12-10369: Relative frequency shifts (Δf/f) for the A01 mode, the A03 mode, and the S0 mode in the measurements of the NaCl solutions.

Mentions: The first experiment was done to measure known solutions with different concentrations (Figure 3), such as NaCl solutions. When water is designated as the reference liquid, the relative frequency shifts (Δf/f = (fsolution − fwater)/fwater) with concentration are different for these three modes (A01 mode, A03 mode, and S0 mode), where fsolution and fwater are the measured frequencies for the solution and the water, respectively. The frequency of the A01 mode decreases with the concentrations and the A03 mode behaves oppositely. In the case of the A03 mode of NaCl solutions measured in Figure 3, the absolute value ρΔδE is bigger than the absolute value δEΔρ (Table 1). This causes the positive frequency shifts of A03 mode in NaCl solutions measurements. In any case, when the frequency shift is positive, this means the Lamb wave phase velocity is close to the liquid sound velocity. In this case, this phenomenon can be used to decouple the liquid sound velocity.


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)

Relative frequency shifts (Δf/f) for the A01 mode, the A03 mode, and the S0 mode in the measurements of the NaCl solutions.
© Copyright Policy
Related In: Results  -  Collection

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

f3-sensors-12-10369: Relative frequency shifts (Δf/f) for the A01 mode, the A03 mode, and the S0 mode in the measurements of the NaCl solutions.
Mentions: The first experiment was done to measure known solutions with different concentrations (Figure 3), such as NaCl solutions. When water is designated as the reference liquid, the relative frequency shifts (Δf/f = (fsolution − fwater)/fwater) with concentration are different for these three modes (A01 mode, A03 mode, and S0 mode), where fsolution and fwater are the measured frequencies for the solution and the water, respectively. The frequency of the A01 mode decreases with the concentrations and the A03 mode behaves oppositely. In the case of the A03 mode of NaCl solutions measured in Figure 3, the absolute value ρΔδE is bigger than the absolute value δEΔρ (Table 1). This causes the positive frequency shifts of A03 mode in NaCl solutions measurements. In any case, when the frequency shift is positive, this means the Lamb wave phase velocity is close to the liquid sound velocity. In this case, this phenomenon can be used to decouple the liquid sound velocity.

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