High precision Refractive-index Measurement Using Rainbow Method and Its Application to Water Analysis

彩虹法高精度折射率测量及其在水分析中的应用

• 批准号: 09650045
• 负责人: KAGAWA Kiichiro
• 金额: $ 2.18万
• 依托单位: Fukui University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650045/
• 关键词: Refractometer; Refractive Index of Liquid; Water Quality Inspection; Rainbow Method; 環境水の屈折率; 水の元素分析; レインボ-法; 環境水の電気伝導度

A simple and high precision method to measure the refractivity of a liquid has been required for material analysis and also for application to environmental pollution monitoring of river water and sea water. We have developed a new method for measuring the refractive indices of liquids, This method uses the minimum deviation of a laser beam in a cylindrical cell that contains the liquid sample. The principle is nearly the same as that of the generation of a natural rainbow, and we therefore call this method the "Rainbow Method". The liquid to be measured is contained in 60 mm diameter, cylindrical glass cell, and a He-Ne laser light is passed into the cell so that the laser light incidence fulfils the condition of minimum deviation. In this condition, the beam emerging from the cell has a interference fringe which can be used as a marker to measure the faint deflection of the laser beam. Based on Huygense-Fresnel principle a computer simulation was made on the optical system. The fringe shape and the fringe intervals computed are precisely coincident with those obtained in experiments. As a result, suitable combination on the diameter of the cylinder containing a sample and the beam size of a laser can be determined by the computer simulation study. By using the characteristic curve of deviation angle vs. refractive index for each fringe, and by the statistical treatment, measurement with high precision was demonstrated. Some application to the water analysis also has been carried out with fairly good result.

在物质分析以及河水和海水的环境污染监测中，需要一种简单而高精度的方法来测量液体的活度。本文提出了一种测量液体折射率的新方法，该方法利用激光束在装有液体样品的圆柱形池中的最小偏差。其原理与自然彩虹的产生原理几乎相同，因此我们称这种方法为“彩虹法”。将待测液体装在直径为60 mm的圆柱形玻璃池中，将He-Ne激光通入池中，使激光入射满足最小偏差的条件。在这种情况下，从细胞中发出的光束具有干涉条纹，该干涉条纹可以用作测量激光束的微弱偏转的标记。根据惠更斯-菲涅耳原理，对光学系统进行了计算机仿真。计算得到的条纹形状和条纹间距与实验结果吻合较好。结果表明，通过计算机模拟研究，可以确定合适的样品圆柱直径和激光光束尺寸的组合。利用各条纹的偏转角-折射率特性曲线，经统计处理，实现了高精度的测量。并在水质分析中进行了应用，取得了较好的效果.

项目成果

S.Kagawa: "Observation of Snow Crystals Using a Chamber Cooled by Dry Ice" Physics Education. Vol.34. 43-45 (1999)

S.Kakawa：“使用干冰冷却的房间观察雪晶”物理教育。

H.Kurniawan: "Characteristics of the Secondary Plasma Induced by Focusing a 10 mJ XeCl Laser Pulse at Low Pressures" Applied Spectroscopy. Vol.51. 1769-1780 (1997)

H.Kurniawan：“低压下聚焦 10 mJ XeCl 激光脉冲引起的二次等离子体的特征”应用光谱学。

H.Hattori: "Using Minimum Devidtion of a Seconddry Rainbow and Its Application to Water Analysis in a high-precision, Refractive-index Comparator for Liguio" Applied Optics. Vol.36. 5552-5556 (1997)

H.Hattori：“在 Liguio 的高精度折射率比较器中使用第二干彩虹的最小间距及其在水分析中的应用”应用光学。

H.Hattori: "Liquid Refractometry by the Rainbow Method" Applied Optics. Vol.37. 4123-4129 (1997)

H.Hattori：“彩虹法液体折射法”应用光学。

H.Kurniawan: "Characteristics of the Seconddry Plasnd Induced by Focusing a low J Xecl Laser Puls at Low Pte." Applied Specfroscopy. Vol.51. 1769-1780 (1997)

H.Kurniawan：“通过聚焦低 J Xecl 激光脉冲在低 Pte 引起的 Seconddry Plasnd 的特征。”