Chemical composition measurement technologies for binary systems are needed in many industrial and research applications for monitoring fluid composition in pipes and sample analysis. Except for spectroscopy technology, composition measurement is retrieved by monitoring fluid properties as refractive index, density, electrical conductivity or fluid sound velocity. Demanding applications are those where optical access to the fluid is not easy or available, very local or/and fast measurements are required, and where space limitations dictate the use of sub-millimeter non-intrusive sensors. Combination of all the above constraints in one application makes it extremely difficult to cope with. The latter is the motivation for the present work where a novel diagnostic method, based on I-VED (In-Vivo Embolic Detector) patented technology used in humans for the diagnosis of Coronary Artery Disease and Decompression Sickness, is implemented to determine the concentration of a binary mixture using high frequency impedance measurements. At first, the technology allows tuning over a range of excitation frequencies to identify a proper signal where the fluid attains chiefly an ohmic behavior. Then it retrieves chemical composition of the binary system through calibration curves with respect to resistance and temperature. Adaptation of the I-VED as concentration sensor has been driven by the necessity to integrate such a diagnostic in setups where available solutions in literature cannot be applied. Further to satisfying the aforementioned constraints, I-VED offers also other advantages compared to existing technologies as it provides high-scale resolution, it is not sensitive to electromagnetic interference (EMI) and it retrieves an integrated signal of the liquid between the electrodes, so localization of the measuring volume can be controlled. The proposed method has been tested in aqueous solutions of alcohol and its dependence on temperature and alcohol concentration has been investigated at an existing experimental setup named SELENE (SELf-rewetting fluid for ENErgy management), developed for heat transfer research applications.

在许多工业和研究应用中，需要使用用于二元系统的化学成分测量技术来监视管道中的流体成分和样品分析。除光谱技术外，通过监测流体的折射率，密度，电导率或流体声速等流体性质来检索成分测量结果。要求苛刻的应用是那些不容易或无法通过光学途径获取流体，需要非常局部或/和快速测量，且空间限制要求使用亚毫米级非侵入式传感器的应用。在一个应用程序中将所有上述约束结合在一起，就很难应对。后者是当前工作的动力，其中采用了一种新颖的诊断方法，基于I-VED（体内栓塞检测器）的专利技术，该技术已在人类中用于诊断冠状动脉疾病和减压病，该技术可通过高频阻抗测量来确定二元混合物的浓度。首先，该技术允许在一定范围的激励频率上进行调谐，以识别适当的信号，从而使流体主要达到欧姆特性。然后，它通过关于电阻和温度的校准曲线来检索二元系统的化学成分。I-VED作为浓度传感器的适应性驱动是由于必须将此类诊断集成在无法应用文献中可用解决方案的设置中。除了满足上述限制外，与现有技术相比，I-VED还具有其他优势，因为它具有高分辨率，对电磁干扰（EMI）不敏感，并且可以在电极之间获取液体的积分信号，因此可以对测量体积进行定位受控。该方法已在酒精水溶液中进行了测试，并且在现有的名为SELENE（用于能量管理的SELf再润湿液）的实验装置上研究了其对温度和酒精浓度的依赖性，该装置是为传热研究而开发的。