权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Development of a Sensitive Lazer Spctrophotometric Environmental Monitoring Device Using Droplet Method

液滴法灵敏激光分光光度环境监测装置的研制

基本信息

批准号：
10650797
负责人：
KORENAGA Takashi
金额：
$ 2.56万
依托单位：
The University of Tokushima
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650797/
关键词：
droplet sampling device nitrogen dioxide lazer passive sampler microchip microfabrication サンプリング

项目摘要

We developed and used the passive sampling device to measure NOx in SOx in air pollution. In the present work we have changed the passive sampler method to the droplet method. Because the passive sampler is, however, not fit to the high sensitivity and precise analysis and, therefore, unable to monitor micro-amounts of variable toxic substances in long period exposure.To meet the solution of disadvantage, we adopted the Dasgupta's droplet method. We use the light-emitting diode and the optical fiber to analyze the droplet which used in the experiment is the cylindrical chamber. In the center of the chamber there is a stainless steel tube. It is used to deliver the solution. And the tip of a stainless tube always keeps the droplet dripping. The gas stream is introduced into the cylindrical chamber at the top, from two oppositely located gas inlets, to achieve more symmetric flow profile around the droplet. Then the droplet collects the gas and is changed the color. The light from a high brightness LED illuminates the droplet. On the diametrically opposite side, the transmitted light is conducted by a plastic optical fiber to a photodiode equipped with an interface filter. A reference photodiode is placed at the back plane of the LED to provide a dual-beam referenced detection arrangement. Absorbance is computed as -log[ (Id-Id')/(Ir-lr') ] +Ko where Id and Ir are the respective photocurrents generated by the detector and the reference photodiode, Id' and Ir' are the corresponding dark currents, and Ko is an offset constant that compensates for the inequality between the intensities of the reference beam and the probe beam directed to the drop.Our purpose and goal are the application of the recent micromachining techniques to the droplet method. A microchip of several centimeter square can collect and analyze the gas sample. Also, microfabrication of the droplet method will give the smallest analysis device which can be applicable to various environmental samples.

我们开发并使用了被动采样装置来测量大气污染中SOx中的NOx。在本工作中，我们将被动取样器法改为液滴法。但是，由于被动采样器不适合高灵敏度和高精度的分析，因此无法监测长期接触中的微量可变有毒物质，为了解决这一缺点，我们采用了Dasgupta的液滴方法。我们使用发光二极管和光纤来分析实验中使用的液滴是圆柱形的腔体。在房间的中央有一根不锈钢管。它被用来交付解决方案。而不锈钢管子的顶端总是让液滴保持滴落。气流从两个相对的进气口进入顶部的圆柱形燃烧室，以获得更对称的液滴周围流动轮廓。然后，液滴收集气体并改变颜色。来自高亮度LED的光照亮了液滴。在直径相反的一侧，透射光通过塑料光纤传导到配备有接口滤光片的光电二极管。参考光电二极管被放置在LED的背面处，以提供双光束参考检测布置。吸光度计算为-log[(ID-ID‘)/(Ir-Lr’)]+Ko，其中ID和Ir分别是探测器和参考光电二极管产生的光电流，ID‘和Ir’是相应的暗电流，Ko是补偿指向液滴的参考光和探测光强度之间的不平等的偏移常数。我们的目的和目标是将最新的微加工技术应用于液滴方法。一个几厘米见方的微芯片就可以采集和分析气体样品。此外，液滴法的微细加工将提供最小的分析装置，可以适用于各种环境样品。