THE DEVELOPMENT OF NEW POLARIZATION-MODULATION SPECTROMETER FOR SIMULTANEOUS CIRCULAR DICHROISM AND OPTICAL ROTATORY DISPERSION MESUREMENTS

圆二色性和旋转色散同步测量的新型偏振调制光谱仪的研制

• 批准号: 60840011
• 负责人: SHINDO YOHJI
• 金额: $ 8.83万
• 依托单位: RESEARCH INSTITUTE FOR MATERIAL SCIENCE AND ENGINEERING School of Engineering, Fukui University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research
• 财政年份: 1985
• 资助国家: 日本
• 起止时间: 1985 至 1986
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-60840011/
• 关键词: POLARIZATION-MODULATION SPECTROMETER FOR CD & ORD; CD & ORD SPECTROPOLARIMETER; MUELLER MATRIX METHOD; SIMULTANEOUS CD & ORD MESUREMENTS; 円二色性; 旋光分散; ミュラー解析法

From the Mueller matrix approach, we designed and constructed a new polarization-modulation spectrometer for simultaneous circular dichroism(CD) and optical rotatory dispersion(ORD) measurements. We also used the Mueller matrix for analyzing and evaluating the possible causes of the base-line shift and other important features determining the performance of the new spectrometer. We have found that the performance of our spectrometer depends upon mainly the following facts: 1. the harmonic rejection of the lock-in amplifiers, 2. the quality of the birefringent prisms used as the polarizer and the analyzer, 3. the position of the analyzer, 4. the residual static birefringence of the photo-elastic modulator, 5. the residual static birefringence of the quartz plates used as the windows of the modulator.We have cleared away the above obstacles by using the highest quality of the lock-in amplifiers, of the modulator, of the quartz plates, and of the prisms mounted on the prism holders specially designed for delicate adjustment. As a result, the capability of our new spectrometer in measuring CD and ORD signals is equal to that of commercially available CD and ORD spectropolarimeters in the range from 200nm to 700nm. We have also successfully interfaced an IBM PC/XT personal computer to our spectrometer by using a Data Translation DT-2805 I/O board, and accomplished on-line real-time data acqusition and data-processing. The all programs for these procedures are written in ASYST available from MacMillan Software Co..

从Mueller矩阵方法出发，我们设计并构建了一种新的偏振调制光谱仪，用于同时测量圆二色性（CD）和旋光色散（ORD）。我们还使用Mueller矩阵来分析和评估基线偏移的可能原因以及决定新光谱仪性能的其他重要特征。我们已经发现，我们的光谱仪的性能主要取决于以下事实：1。锁定放大器的谐波抑制，2.用作起偏器和检偏器的双折射棱镜的质量，3.分析仪的位置，4.光弹性调制器的残余静态双折射，5.作为调制器窗口的石英片的剩余静态双折射。我们通过使用最高质量的锁定放大器、调制器、石英片以及安装在专为精密调节而设计的棱镜支架上的棱镜，消除了上述障碍。结果表明，在200 ~ 700 nm波长范围内，我们研制的新型光谱仪在测量CD和ORD信号方面的能力与市售的CD和ORD分光偏振计相当。我们还成功地用DT-2805 I/O板将IBM PC/XT个人计算机与谱仪连接，实现了在线实时数据采集和数据处理。这些程序的所有程序都是用MacMillan软件公司提供的ASYST编写的。

项目成果

Y.Shindo: Rev. Sci. Instrum.

Y.Shindo：Rev.Sci。

Y.Shindo: J. Appl.Optics.

Y.Shindo：J.应用光学。

Review of Scientific Instruments. 56-12. (1985)

科学仪器审查。

Y.Shindo: Rev. Sci. Instrum.56. 2237-2242 (1985)

Y.Shindo：Rev.Sci。

Y. Shindo: "New polarization-modulation spectrometer for simultaneous circular dichroism and optical rotatory dispersion mesurements ( <I> ) Instrument design, analysis, and evaluation," Rev. Sci. Instrum.56. 2237 (1985)

Y. Shindo：“用于同步圆二色性和旋光色散测量 (<I>) 的新型偏振调制光谱仪仪器设计、分析和评估”Rev. Sci。