Optical Fiber Multi-Sensing System Using Liquid Crystal and Dye Films

使用液晶和染料薄膜的光纤多传感系统

• 批准号: 10555114
• 负责人: SATO Susumu
• 金额: $ 1.22万
• 依托单位: AKITA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 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-10555114/
• 关键词: Optical Fiber; Optical Sensing; Reactive Gas; Liquid Crystal; Electric Field Sensor; Multi-Sensing

1. Various organic dye films are deposited on the corner-cube prism, and the color reaction spectra, fluorescent spectrum changes and their intensities for small quantity of reaction gases are measure, evaluated and selected for the research studies.2. Cholesteric liquid crystal cells with selective reflection band at 1.3 μm are prepared using cholesteric liquid crystals containing nematic liquid crystals with adjusted dissolving ratios.3. The sensor heads with the corner-cube prism of which surfaces are coated by different dye films are constructed, and spectrum changed for acid and/or base gases are analyzed by using multi-variable parameter method. Then the separation and detection of gas species can be attained.4. On the basis of experimental results, the multi-sensor heads are prepared by sandwiching a couple of cholesteric liquid crystal cells and a nematic liquid crystal cell between the corner-cube prism coated with dye films and the rod lens connected with the optical fiber. Then the multi-sensing system is constructed and its properties are measured and evaluated.5. The liquid crystal cells are prepared using the substrates coated with several alignment films, which have different anchoring intensities, and the dependence of transmission properties on the electric fields are measured as the change of molecular orientation states. Relations between the anchoring strength and the molecular orientation for the electric field are studied and the evaluations for their properties have been made.6. The multi-sensor heads above described are connected with the optical fiber, and the sensing system is implemented using an OTDR method, where abnormal phenomena of plural electric apparatuses can be monitored remotely.7. The results are examined and the research work is summarized.

1.在角锥棱镜上沉积了各种有机染料薄膜，测量、评价和选择了少量反应气体的显色反应光谱、荧光光谱变化及其强度.采用不同溶解比的胆甾相液晶，制备了具有1.3 μm选择反射带的胆甾相液晶盒.构造了表面涂有不同染料膜的角锥棱镜传感头，用多变量参数法分析了其对酸碱气体的光谱变化。从而实现气体组分的分离和检测.在实验的基础上，通过在涂有染料膜的角锥棱镜和与光纤连接的棒形透镜之间夹入一对双折射液晶盒和一个双折射液晶盒，制成了多传感头。构建了多传感器系统，并对其性能进行了测试和评价.用不同锚定强度的取向膜制备了液晶盒，并测量了液晶盒的透射特性随电场强度的变化。研究了电场作用下锚定强度与分子取向的关系，并对其性质进行了评价.上述多传感器头与光纤连接，并且使用OTDR方法实现感测系统，其中可以远程监测多个电气设备的异常现象。对结果进行了检验，并对研究工作进行了总结.

项目成果

Y.Sato: "A Monte Carlo Simulation on Properties of Fluorescent Displays Using GaN UV LEDS"The 5th International Conference on Science and Technology of Display Phosphors. 8-3. 279-282 (1999)

Y.Sato：“使用 GaN UV LED 的荧光显示器性能的蒙特卡罗模拟”第五届国际显示器荧光粉科学与技术会议。

M. Kawamura: "An Optical Sensing System Using Liquid Crystal Cells and Corner Cube Prisms Coated with Dye Films for Simultaneous Detecting and Electric Field and Decomposition Products of SFィイD26ィエD2"Japanese Journal of Applied Physics. 37, No. 10. 5669-5

M. Kawamura：“使用液晶单元和涂有染料薄膜的角立方棱镜来同时检测 SF-D26 的电场和分解产物的光学传感系统”《日本应用物理学杂志》37，第 10 期 .5669-5。

M. Kawamura: "Simultaneous Detection of an Electric Field and a Small Quantity of Decomposition Products by Use of Several Sensor Heads and OTDR Method"Trans. Inst. Electric Eng. Japan. 119E, No.3. 155-160 (1999)

M. Kawamura：“使用多个传感器头和 OTDR 方法同时检测电场和少量分解产物”Trans。

S. Sato: "Applications of Liquid Crystals to Variable-Focusing Lenses"Optical Review. 6, No.6. 471-485 (1999)

S. Sato：“液晶在可变焦距镜头中的应用”光学评论。

M.Kawamura: "An Optical Sensing System Using Liquid Crystal Cells and a Corner Cube Prism Coated with Dye Films for Simultaneous Detecting of an Electric Field and Decomposition Products of SF_6" Japanese Journal of Applied Physics. Vol.37, No.10. 5669-56

M.Kawamura：“使用液晶单元和涂有染料膜的角立方棱镜的光学传感系统，用于同时检测电场和 SF_6 的分解产物”日本应用物理学杂志。