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

通过将具有高折射率的溶液注入到由吡咯或石英制成的毛细管中，研究了液芯光纤。我们已经证实，在大于3×10~(-4)的溶液中，使用长度为50m的液芯波导池可以提高吸光度。在本研究中，主要研究了波导池在荧光和浊度测量中的应用。首次考虑了在毛细管池的一端激发溶液中的荧光团，在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，荧光强度在数量级上达到最大，而当毛细管长度超过60 cm时，荧光强度降低。然而，最好的信噪比是使用12米小室，其中由激发源(激光)提供的噪声被过滤。研究了另一种荧光测量方法，其中光源被引导通过毛细管池，并从毛细管的矩形一侧收集荧光。涡流池是这种荧光检测的有效方法，它对溶液折射率的变化表现出最高的响应。利用该涡旋池建立了自动流动注射系统，检测限为2 ppb，并成功地应用于环境样品。在磁场作用下，毛细管中填充稀磁铁矿胶体溶液时，出现了强烈的磁光双折射。已经证明，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.