采用光二极管列阵技术的生物组织荧光光谱测量系统

我们报导一台采用光二极管列阵技术，微计算机控制的中型生物组织激光诱导测量系统，该系统的主要特点是操作简单，实时测量并可采用双波长激发。利用该系统，首次研究了光敏染料在琼脂凝胶状固体模式（模拟生物组织）中的荧光光谱。结果表明，该系统适用于临床上通过组织的自体或外源荧光光谱来鉴别正常组织和病变组织。     

《光谱学与光谱分析》2015年征订启事

欢迎投稿欢迎订阅欢迎刊登广告国内邮发代码:82-68国外发行代码:M905《光谱学与光谱分析》1981年创刊,国内统一刊号:CN 11-2200/O4,国际标准刊号:ISSN 1000-0593,CODEN码:GYGFED,国内外公开发行,大16开本,292页,月刊;是中国科协主管,中国光学学会主办,钢铁研究总院、中国科学院物理研究所、北京大学、清华大学共同承办的学术性刊物。北京大学出版社出版,每期售价50.00元,全年600元。刊登主要内容:激光光谱测量、红外、拉曼、紫外、可     

Eu3+掺杂YPO4的合成、结构及发光特性研究

以Eu^3＋掺杂YPO4为研究对象,通过简单水热法在200℃下制备了不同Eu^3＋掺杂浓度的YPO4纳米颗粒。采用X射线粉末衍射、透射电镜和荧光光谱对样品进行了表征,研究了Eu^3＋掺杂浓度对相结构、发光性能的影响。实验结果表明,通过调节掺杂Eu^3＋离子的浓度可以对样品的相结构进行调控。随着Eu^3＋掺杂浓度的提高,样品发生了从四方相到六方相,最后到单斜相的转变。因此通过不同Eu^3＋离子浓度的掺杂可以实现相结构的调控。荧光光谱测量发现所有发射均为Eu^3＋的f-f能级之间的特征跃迁,并且确定掺杂浓度为10％的样品具有最强的发光强度。     

径向基函数网络在近红外人体无创伤血糖浓度检测基础研究中的应用

在近红外无创伤血糖浓度检测的基础研究中，对于多组分的混合物的分析，常因光谱与样品浓度之间呈现非线性响应，使得基于线性模型的校正方法失效。本文讨论了非线性校正方法径向基函数神经网络( RBFN )的有效性，并与线性校正方法中的主成分分析和偏最小二乘法作了对比研究。验证实验所用样品为①葡萄糖水溶液②包含牛血红蛋白和白蛋白的葡萄糖水溶液，结果表明：在①实验中PLS模型和RBFN预测标准偏差分别为8．2、8．9；在②实验中分别为15．6、8．8。可见在样品组分增多时，RBFN算法较线性PLS方法建立的模型预测能力强。     

Ultrafast spectroscopy of semiconductor saturable absorber mirror

Ultrafast spectroscopy of semiconductor saturable absorber mirror(SESAM) is measured using a femtosecond pump-probe experiment.This allows dynamic responses of SESAM in the cavity to be concluded by ultrafast spectroscopy.Change in reflection is measured as a function of pump-probe delay for different pump excitation fluences.Change of nonlinear reflection of SESAM is measured as a function of incident light energy density.When the excitation fluence increases,nonlinear change in ultrafast spectroscopy of SESAM becomes increasingly significant.When SESAM is pumped by an ultrahigh excitation fluence,the energy density of which is approximately 1400 μJ/cm2,two-photon absorption can be observed visibly in its ultrafast spectroscopy.     

相关诱导光谱变化对光谱测量的影响

在光传播空间中引入的光阑会对光谱的传播产生影响。以一个常用的光谱测量系统为模型,对系统中的光阑对光谱变化的影响进行了深入的研究。研究结果表明,狭缝的衍射和透镜的色差以及光源的空间相干度的变化都有可能使衍射场中观察点的光谱出现变化,并且这种变化与观察点的空间位置有关。这种相关诱导光谱变化会对光谱的精确测量产生影响。     

基于实测数据的新疆富蕴季节性积雪光谱分析

使用FieldSpec 3(350～2 500 nm)光谱仪野外测得新疆富蕴地区季节性积雪光谱,与冰对比得出了该地区典型季节性积雪光谱特征,并分析了太阳高度角、 坡度、 雪深、 污染物浓度对积雪光谱的影响。研究结果表明：积雪反射率在可见光波段较高,随波长的增加逐渐减小;随着太阳高度角的增大积雪反射率逐渐降低,且在1 090和1 300 nm对太阳高度角的变化敏感;坡度的存在使积雪反射率大幅上升;在一定深度范围内,积雪反射率随雪深的增加而增大,在400～500和1 250～1 320 nm,反射率对雪深变化敏感;随着污染物的增加,积雪反射率在可见光波段明显下降,且波峰波谷趋于平缓。季节性积雪的光谱测量和分析工作对于积雪参数的监测和反演具有重要意义。     

Spectroscopic properties of Tm,Ho:LiLuF_4

LiLuF4 single crystals co-doped with thulium （5%） and holmium （0.5%）, having large size, intact shape, and high optical quality, are successfully grown by the Czochralski technique. Absorption and fluorescence spectra of the crystal are measured. The absorption spectrum shows that the main absorption band locates at near 686 and 792 nm and the fluorescence spectrum peaks at 2.05 um. At room temperature, the as-grown Tin, Ho： LiLuF4 single crystals are end-pumped by a fiber-coupled laser diode system with pumping wavelength of 795 nm under CW operations. A power of 50 mw contin- uous laser outout at 2.05-um wavelength is achieved. Meanwhile an obvious green light is detected.     

Development of a new atmospheric pressure cold plasma jet generator and application in sterilization

This paper reports that a new plasma generator at atmospheric pressure, which is composed of two homocentric cylindrical all-metal tubes, successfully generates a cold plasma jet. The inside tube electrode is connected to ground, the outside tube electrode is connected to a high-voltage power supply, and a dielectric layer is covered on the outside tube electrode. When the reactor is operated by low-frequency (6 kHz--20 kHz) AC supply in atmospheric pressure and argon is steadily fed as a discharge gas through inside tube electrode, a cold plasma jet is blown out into air and the plasma gas temperature is only 25--30℃. The electric character of the discharge is studied by using digital real-time oscilloscope (TDS 200-Series), and the discharge is capacitive. Preliminary results are presented on the decontamination of E.colis bacteria and Bacillus subtilis bacteria by this plasma jet, and an optical emission analysis of the plasma jet is presented in this paper. The ozone concentration generated by the plasma jet is 1.0×10¹⁶cm^-3 which is acquired by using the ultraviolet absorption spectroscopy.     

Characterization of tissue cells by full information from spectral interferogram

A new method for characterizing living tissue cells is demonstrated using both phase and amplitude information derived from the spectrally resolved interferogram in a single measurement.The effect of the light source spectral distribution can be cancelled out with the help of the zero order spectrum of the Fourier transform of the interferogram.The ratio of amplitudes between the two interference beams is acquired without this effect.The group delay,the first and second order dispersions,and the absorption,etc.,for the full wavelength range can be measured.The results of the culture medium and the HeLa living cells are given.In addition,the measured values of d2 n/dλ2 and absorption of the distilled water are also provided for comparison.