Characteristics of vision-based on-chip pressure sensor with different concentrations of sensing fluid
Characteristics of vision-based on-chip pressure sensor with different concentrations of sensing fluid
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DOI：
10.1109/icma.2015.7237539
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发表时间：
2015-09
期刊：
影响因子：
--
通讯作者：
F. Hesse;C. Tsai;M. Kaneko
中科院分区：
文献类型：
--
作者：
F. Hesse;C. Tsai;M. Kaneko
一个微流控，基于视觉的压力传感器进行了测试与三个不同浓度的有色溶液，作为传感器的传感流体。该传感器基于聚合物腔室的变形，这导致感测流体流入或流出感测区域，从而导致颜色强度的变化。这种变化被数码相机记录下来，并从每一帧中计算出传感区域的平均暗度。压力和暗度值高度相关，绝对相关性为0.9293或更高。因此，对于每个颜色浓度，确定线性传递函数。不同浓度的相关因子差异很大，相关因子被定义为其暗度-压力图上的斜率。30%溶液的相关系数比5%溶液的相关系数低约3倍，导致平均分辨率为2.2 kPa的3倍。
A microfluidic, vision-based pressure sensor is tested with three different concentrations of coloured solution, which serves as sensing fluid for the sensor. The sensor is based on the deformation of the a polymeric chamber, which causes the sensing fluid to flow in or out of the sensing area, resulting in a change of colour intensity. That change is recorded by a digital camera and the average darkness of the sensing area is calculated from each frame. Pressure and darkness value are highly correlated, with an absolute correlation of 0.9293 or higher. Thus, for each colour concentration a linear transfer function is determined. The different concentrations greatly differ by the correlation factor, which is defined as the slope on its darkness-pressure plot. The 30% solution's correlation factor is about 3 times lower than the 5% solution's factor, resulting in a 3 times finer resolution of 2.2 kPa on average.