Liquid density analysis of sucrose and alcoholic beverages using polyimide guided Love-mode acoustic wave sensors
Liquid density analysis of sucrose and alcoholic beverages using polyimide guided Love-mode acoustic wave sensors
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DOI：
10.1088/0957-0233/17/2/005
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发表时间：
2006-02-01
影响因子：
2.4
通讯作者：
Wood, D
中科院分区：
文献类型：
--
作者：
Turton, A;Bhattacharyya, D;Wood, D
研制了一种适用于食品和饮料工业的液体密度传感器。该传感器具有开放的平坦表面，允许浸入样品中并进行简单的清洁。聚酰亚胺波导层允许廉价和简单的制造与坚固的耐化学性表面相结合。聚酰亚胺的低剪切模量允许薄的引导层提供高灵敏度。一个双重结构，具有一个光滑的参考装置，表现出与波的粘性耦合，和一个图案化的感测区域，以捕获液体引起的质量负载，允许从密度-粘度积（ρ eta）（0.5）的平方根的液体密度的歧视。频率偏移和插入损耗变化与（ρ eta）（0.5）成比例，由于粘性液体在高频下的非牛顿性质，具有非线性响应。测量了蔗糖溶液高达50%和不同的酒精饮料。最大灵敏度为0.13 μ g cm（-3）Hz（-1），频率响应与密度呈线性关系。据我们所知，这是声学模式传感器获得的最高液体密度灵敏度。
A liquid density sensor using Love-mode acoustic waves has been developed which is suitable for use in the food and drinks industries. The sensor has an open flat surface allowing immersion into a sample and simple cleaning. A polyimide waveguide layer allows cheap and simple fabrication combined with a robust chemically resistant surface. The low shear modulus of polyimide allows thin guiding layers giving a high sensitivity. A dual structure with a smooth reference device exhibiting viscous coupling with the wave, and a patterned sense area to trap the liquid causing mass loading, allows discrimination of the liquid density from the square root of the density-viscosity product (p eta)(0.5). Frequency shift and insertion loss change were proportional to (p eta)(0.5) with a non-linear response due to the non-Newtonian nature of viscous liquids at high frequencies. Measurements were made with sucrose solutions up to 50% and different alcoholic drinks. A maximum sensitivity of 0.13 mu g cm(-3) Hz(-1) was achieved, with a linear frequency response to density. This is the highest liquid density sensitivity obtained for acoustic mode sensors to the best of our knowledge.