Enhancement sensitivity of smectrometry using waveguiding effect and its application to natural water analysis.

本文研究了将高折射率溶液注入到石英或耐热玻璃毛细管中的液芯光纤。我们已经证明，使用一个长度为50米的液芯波导池，溶液中的吸光度增强超过3 × 10^4。本论文主要研究了波导池在荧光分析和比浊分析中的应用，首次考虑了从一端激发溶液中的荧光团，在毛细管池的另一端收集荧光的光学结构。在该方法中，当使用60 cm的毛细管时观察到最大荧光强度的大小，并且细胞长度超过60 cm的延伸使荧光减弱。然而，最好的信号噪声比是通过使用一个12米的细胞，其中的噪声贡献的激发源（激光）被过滤。研究了另一种荧光测定方法，其中光源光被引导通过毛细管池，并且从毛细管的矩形侧收集荧光。涡流池是有效的，用于这种方式的荧光检测，它显示出最高的响应溶液的折射率的变化。利用该涡流池建立了一个自动流动注射系统，检测限为2ppb，并成功地应用于环境样品中，当毛细管池中充满稀释的磁铁矿胶体溶液时，在磁场作用下出现了强的磁光双折射。已经证实，这种双折射与晶胞长度和磁铁矿胶体的浓度成正比。

Liquid-core optical fibers have been investigated by means of injecting the solution possessing high refractive index into capillaries made of pyrex or quartz. We have already testified the enhancement of absorbance in the solution more than 3 x 10^4 by the use of a liquid-core wave-guiding cell of which length was 50 m. In this study, application of the wave-guiding cells to fluorometry and turbidimetry was mainly studied.The optical configuration, where excitation of fluorophore in the solution was carried out from one terminal and fluorescence was collected at another terminal of the capillary cell, was first considered. In this method, the maximum fluorescence intensity in its magnitude was observed when the capillary of 60 cm was used, and extension of the cell length longer than 60 cm made decrease of fluorescence. However, the best signal to noise ratio was given by the use of a 12-m cell in which the noise contributed by the excitation source (laser) was filtrated. Another fluorometric method was studied where the source light was guided through the capillary cell and fluorescence was collected from the rectangular side of the capillary. A vortex cell is effective to use in this manner of fluorescence detection, which show the highest response to the change of refractive index of solution. An automated flow injection system has been constructed with the use of this vortex cell, which provides 2 ppb of lead as the detection limit and was successfully applied to the environmental samples.Strong magneto-optical birefringence appeared when the capillary cell was filled with the diluted magnetite colloid solution under the magnetic field. It has been attested that this birefringence is proportional to the cell length and the concentration of the magnetite colloid.