【作者】 李小梅；

【导师】 孙伟民；

【作者基本信息】 哈尔滨工程大学 ， 光学工程， 2007， 硕士

【摘要】 光纤液滴传感器是利用被测液滴的形成过程与液体成份之间的关系而制成的一种液体测试传感器。利用它来监测液滴的增长过程，并通过分析随液滴下降过程而变化的光强变化曲线，可以获得反映液体的物理、化学性质的“光纤液滴指纹图”。通过分析液滴指纹图，可以得到一些相关的信息，从而鉴别一些液体。本文首先介绍了光纤液滴指纹图各部分所对应的液体信息。在此基础上，概述了现在已有的液滴指纹图分析方法。最后引出了两种新的液滴指纹图分析方法，互相关函数法和互功率谱密度函数峰值法。它们分别从时域和频域分析了液滴指纹图之间的相关关系，并利用这种关系对不同浓度的乙醇溶液的液滴指纹图和不同浓度的蔗糖溶液的液滴指纹图进行了分析，得到了一些规律。利用这些规律，可以比较准确地鉴别一些液体并标定被测液体的浓度。更多还原

【Abstract】 The optical fiber drop sensor is a type of the liquid-testing sensors based on the relationship between the dripping process and the characters of the liquid to be tested. This type of sensors can monitor the variety of the light intensity during the dripping process. The fiber fingerprint drop trace, shortly FFDT, can be gotten through analyzing the dripping process. It reflects the physical and chemical characters of liquid samples. Analyzing the fingerprint drop trace, some interrelated information can be obtained to discriminate some different liquids.Firstly, the fiber fingerprint drop trace is introduced with the corresponding characters of its every parts. Secondly, some analysis methods existing presently are summed up. At the last, two new analysis methods, the cross correlative function method and the peak of cross power spectral density function method, are put forward. These two methods are based on the correlation between the FFDTs in time region and spectral region respectively. The FFDTs of ethanol solutions and sugar solutions of different concentrations are analyzed with the correlation methods, some useful rules are obtained. Some liquid samples were tested based on these methods accurately.更多还原