A Study on a Multichannel Ordor Sensor Based on Color Information

本研究的目的是建立一个多通道的气味传感系统的基础上接触气味气体时的颜色变化的染料。响应元件由染料阵列、5，10，15，20-四苯基-21H，23H-卟啉和Cu（II）、Zn（II）、Mn（II）、Co（II）、Fe（II）配合物、Reichardt染料、pH指示剂组成（百里酚蓝、甲基橙子、甲基红、酚红、酚酞和茜素黄）和电荷转移络合物的受体，吸附在C18和C2反相TLC板和硅胶板上;分析用扫描仪获得的染料元素的彩色图像以给出红色、绿色和蓝色组分的灰度级。暴露于各种挥发性有机化合物之前和之后的灰度级之间的差异表明，所提出的传感系统即使在存在大量水蒸气的情况下也能够检测目标气体，因此适用于许多气味气体而无需任何预处理。主成分分析区分柑橘类水果，kabosu，柠檬，脐橙橙子和葡萄柚之间，和普通咖啡，罐装咖啡与糖和罐装黑咖啡，使用的一些pH值指示剂的图像成分的灰度级差异作为多变量数据。使用在包层部分具有茜素黄/聚乙烯吡咯烷酮并且在端面上具有薄的金或银膜的光纤作为传感元件;当光纤暴露于柑橘类水果、乙酸芳樟酯和芳樟醇的主要气味成分时，在630 nm附近观察到从光纤反射的卤素灯光的信号强度降低。

The aim of this research is to construct a multichannel odor-sensing system based on the color changes of dyes upon contact with odor gases. The response elements were composed of an array of dyes, 5,10,15,20-tetraphenyl-21H,23H-porphin and the Cu(II),Zn(II),Mn(II),Co(II),Fe(II) complexes, a Reichardt's dye, pH indicators (Thymol Blue, Methyl Orange, Methyl Red, Phenol Red, Phenolphthalein and Alizarin Yellow) and acceptors of charge transfer complexes, adsorbed on C18 and C2 reverse-phase TLC plates and a silica-gel one ; color images of the dye elements obtained with a scanner were analyzed to give the gray levels of red, green and blue components. Differences between the gray levels before and after exposure to various kinds of volatile organic compounds suggested that the proposed sensing system was capable of detecting target gases even in the presence of a large quantity of water vapor, and thus was applicable to many odor gases without any pretreatment. A principal component analysis discriminated between citrus fruits, kabosu, lemon, navel orange and grapefruits, and between regular coffees, canned coffees with sugar and canned black coffees, using the gray level differences of some pH-indicator image components as multivariable data. An optical fiber having an Alizarin Yellow/polyvinylpyrrolidone at the cladding part and a thin gold or silver film on an end surface was used as a sensing element; a decrease in the signal intensity of halogen-lamp light reflected from the fiber was observed at around 630 nm when the fiber was exposed to principal odor components of citrus fruits, linalyl acetate and linalool.