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5. Optimization of contact surface and water layer
The influence of the contact surface and the liquid layer is very important. Figure 6 shows the theoretical sensitivity loss as a function of thickness for different coupling liquids. It's clear that for coupling with water (the coupler in our application), the loss of sensitivity is significant between a 5 µm layer and a 20 µm layer. This effect is less significant for honey. There are even materials for which the effect is reversed.
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