LED的光谱分布可调光源的设计

介绍了一种光谱分布可调光源的设计,该光源由积分球和大量不同颜色的LED组成.在可见波段.这种光源能产生不同光谱曲线,可以模拟很多不同光源的光谱分布.该项设计通过仿真使光源的光谱分布模拟目标光源的光谱分布,并设计了电源控制箱精确地控制每个LED模块.光源的面非均匀性为0.53%,角度特性在±10°以内,最大偏差为0.77%.这种新型光源在光辐射测量中可以作为一种传递标准.     

基于LED光谱分布可调光源的设计

发光二极管（LED）是一种半导体固体发光器件。在可见-近红外波段的光辐射测量和光电探测器的定标中,发光二极管显示出高辐射亮度、高电光转换效率、可组合调配光谱分布、发光性能稳定等独特优点,可作为辐射度学,光度学和色度学研究的新型参考光源。本文介绍了一种光谱分布可调光源的设计,它由积分球和大量不同颜色的LED组成。在可见波段,这种光源能产生不同光谱分布,可以模拟很多不同光源的光谱分布。光源设计通过仿真使光源的光谱分布模拟目标光源的光谱分布,并设计了电源控制箱精确地控制每个LED模块。这种新型光源在光辐射测量中可以作为一种传递标准。     

基于多光源的光谱分布可调谐光源系统

针对定标光源和遥感器在轨探测目标的光谱非匹配对空间光学遥感器实验室辐射定标精度的影响,设计了一种基于发光二极管（LED）和基底光源的光谱分布可调谐光源。采用该光源模拟了典型地物目标光谱,用于遥感器的实验室绝对辐射定标,大幅降低了光谱非匹配带来的影响。首先,从理论上分析了光谱非匹配影响遥感器绝对辐射定标精度的机理;然后,根据设计指标确定了光源的设计方案,解决了光源的选型与光谱匹配算法设计、光谱分布可调谐光源驱动和控制系统、目标光谱匹配与光谱反馈调整、光谱分布可调谐光源光机设计等四项关键技术问题;最后,对光源进行了性能测试。测试结果显示：等能光谱和6 000 K黑体光谱的光谱匹配误差分别为6.37%和8.76%,出光口的辐照度非均匀度为0.53%,30 min内的辐照度不稳定度为0.03%,水平方向±30°内的辐亮度角度非均匀度为0.80%,各波长处光谱辐亮度值均高于0.07 W/（m²·sr·nm）,410~900 nm波段积分辐亮度为58.3 W/（m²·sr）,均满足设计指标。     

自校准型光谱辐亮度标准光源

针对高精度空间光学定量遥感的需求,研制了一种采用数字微镜器件的自校准型光谱辐亮度标准光源。该光源具有两种工作模式:在窄带工作模式下,由Gershun管辐射计和CAS光谱辐射计自校准;在宽带工作模式下,作为光谱辐亮度标准光源用于地面或空间遥感仪器的光谱辐亮度响应度定标。以光谱辐照度标准光源和Spectralon标准漫反射板组成光谱辐亮度标准光源为CAS光谱辐射计定标,测得自校准光源的光谱辐亮度。又以标准探测器定标的Gershun管辐射计测量自校准光源,采用迭代法得到自校准光源的光谱辐亮度。窄带模式下两种不同定标方法对自校准光源的光谱辐亮度测量结果在测量不确定度允许范围内一致。不确定度分析显示:基于标准光源和基于标准探测器的自校准光源光谱辐亮度测量不确定度分别为1.41%~2.09%和1.28%~1.61%。实验及不确定度分析结果表明,该光源可以满足高精度空间光学定量遥感的使用要求。     

真空紫外双等离子管光源

双等离子管光源是一低气压、热阴极弧光放电真空紫外(20nm—100nm)光谱光源.光源具有良好的稳定性和重复性, 在光谱辐射计量及光谱学领域的研究中有广泛应用, 它不但具有Penning光源和毛细管放电光源的优点, 而且还补充了它们的不足.     

基于准单色照明光源系统的能量监测系统设计

基于连续可调谐均匀单色照明光源系统的能量监测系统,主要是用于监测和采样待测探测器接收的相对光谱能量,实现能量监测和量子效率的测量。具体方法是在积分球侧壁放置监视探头,用于监测和采样待测探测器接收的相对光谱能量。为了保证能量监测系统的精度和准确性,需要对监测系统的3个监视探头进行相对光谱响应度定标,以提高系统精度。设计结果为表面能量监测系统其光谱监测范围为300nm～2200nm,其光源能量监测范围为100pW～100nw,实现了用于光源能量监测和量子效率的测量目的。     

利用同步辐射建立紫外及真空紫外光谱辐射标准

在辐射计量工作中,光源光谱辐射特性的测定占很重要的地位。可以有两种方法来确定光源的光谱辐射特性:一种是标准光源法,一种是标准探测器法。前者是把待测光源和标准光源在同一光谱辐射计上进行比较,以得出待测光源的光谱辐射特性。后者是用标准探测器和光谱辐射计测得待测光源的光谱辐射分布,然后根据预先测得的光谱辐射计传递特性进行修正。     

应用单一超窄线宽激光器的多气体检测系统设计

应用超窄线宽半导体激光器的波长扫描和光谱调制技术,设计了一种高精度多组分气体实时在线检测系统.系统采用单一超窄线宽可调谐半导体激光器作为光源,设计了新型串联式气室结构减小横向空间、增加光程长,并通过三角波信号对光源光谱进行调制;结合时分复用和空分复用技术,利用超窄线宽激光的特性实现了CO,CO2,CH4多组分气体浓度的...     

白光干涉仪中光源参数的优化选择

在白光干涉仪中,白光光源的参数决定了干涉条纹的分布,对中心条纹的识别精度产生直接影响.采用不同光谱形状的光源或改善光源的光谱形状可提高零级条纹的可见度,利用多个白光光源构成组合光源来改变光源的光谱形状是提高零级条纹可见度的有效方法.在提出组合光源参数优化设计方法的基础上,理论分析得出了双组合光源和三组合光源优化设计的简洁公式.计算机模拟及实验结果表明,经优化设计后组合光源产生的干涉图,其零级条纹可见度大大增加,更有利于提高系统的测量分辨率.     

基于选择最优滤光片的多光谱成像系统的研究

研究了基于选择最优滤光片多光谱成像系统优化问题,采用了优化的滤光片组合,组建了一个六通道的多光谱成像系统。利用提出的基向量和多项式组合的方式重构光谱数据,成功重建出博物馆、美术馆等展览馆常用的两种典型光源模拟器D65和A光源下油画的光谱反射率,并以光谱均方误差和色差综合误差评价成像质量。对两种光源下重建结果分析可得,最优滤光片的选取与光照环境密切相关。根据光照环境不同采用选取出的最优滤光片可得到最好光谱成像图,并且能在光谱和色度上都达到较高精度。     

软X射线-真空紫外大电流空阴极光源的研究

描述了最近研制成功的用于软X射线-真空紫外光谱辐射传递标准光源的大电流空阴极光源。它由两个阳极、一个阴极和一个两级差分泵单元组成,工作电流2A,工作气体为氩和氦,气压10Pa～100Pa.能在13nm～200nm间产生ArⅠ、ArⅡ、HeⅠ、HeⅡ、AlⅡ、AlⅢ和AlⅣ谱线。光源辐射稳定性优于±1%,重复性优于±5%.     

An excimer source of visible light

A gas-discharge excimer radiation source in the visible spectral region has been developed on the basis of a mixture of cadmium diiodide vapors and helium excited by a repetitively pulsed barrier discharge. The source radiation spectrum consists mainly of superimposed spectral bands of emission of cadmium iodide in the range 470–700 nm. The mean radiation power from the source surface (114.5 cm²) is 55 W, the pulse power is 105 kW, and the efficiency is ～10%. Approximately 90% of the radiation power is concentrated in the red region, which is much higher than in high-pressure sodium lamps at comparable energies deposited into the working mixtures. Such sources can be used to efficiently control photosynthesis and the growth and development of plants and algae.     

真空紫外空阴极气体放电光源

真空紫外空阴极光源是一种稳定的气体放电光源,工作气体为He、Ne、Ar、N₂、H₂、CO等,工作气压10torr～10^-2torr,工作电流100mA～400mA,能在20～200nm波段产生丰富的原子和离子谱线,光谱辐射稳定性优于±1%。     

Dynamic photolytical actinometry of the vacuum-ultraviolet radiation produced by multichannel surface discharges of submicrosecond duration

Absolute measurements of the vacuum-ultraviolet (VUV) radiation power produced by a planar broadband optical source of submicrosecond light pulse duration are carried out in the transient regime of formation of a photodissociation (bleaching) wave in a photodecomposing absorptive medium. The source is based on a multichannel surface discharge initiated in ArN(2) gas mixtures on the area of approximately 0.1 m(2). The energetic characteristics of the produced VUV radiation are determined on the basis of spatially and temporally resolved observations of the pulsed photolysis of XeF(2) vapors. It is shown that the photon flux intensity produced by the source within the spectral range of 120-200 nm reaches 1.1 x 10(23) photonscm(2) s corresponding to the effective brightness temperature of discharge plasma of 20 kK and to the intrinsic efficiency of the discharge VUV emission of 3.2%. Numerical simulations of the photolysis process show a rather weak sensitivity of the results to the fraction of discharge radiation emitted into the line spectrum, as well as to the angular distribution of emitted radiation. The spectral band of measurements can be selected according to the choice of parent photodecomposing particles.     

真空紫外反射率的测定

研制了一台测定真空紫外反射率的仪器.在真空紫外区可测量各种反射元件在不同入射角下的反射率.用壁稳氩弧光源在100—200um区对Al十MgF₂薄膜和CVD法制备的SiC镜的反射率进行了测定.并与Al膜的理论反射率曲线做了比较.     

太阳/大气紫外光谱辐射测量

研制成太阳/大气紫外光谱辐射计,工作波段120nm至500nm,光谱分辨率0.08nm。它由标准光源,积分球,双光栅单色仪,探测器及电子学—计算机系统组成。用这台仪器进行了长春地区不同大气条件及大气质量太阳/大气紫外(260～500)nm波段光谱辐射测量。测量结果表明该仪器光谱响应稳定性好于1%/年,太阳/大气紫外波段光谱辐照度测量值(绝对值)不确定度好于3～5%。     

High resolution far-infrared Fourier transform spectroscopy of radicals at the AILES beamline of SOLEIL synchrotron facility

Experimental far-infrared (FIR) spectroscopy of transient species (unstable molecules, free radicals, and ions) has been limited so far in both emission and absorption (mainly by the low probability of spontaneous emission in that spectral range and the low brightness of continuum sources used for absorption measurements, respectively). Nevertheless, the FIR spectral range recently became of high astrophysical relevance thanks to several new observational platforms (HERSCHEL, ALMA...) dedicated to the study of this region suitable for the detection of the emission from cold objects of the interstellar medium. In order to complete the experimental dataset concerning transient species, three discharge experiments dedicated to the recording of high resolution FIR spectra of radicals have been developed at the Advanced Infrared Line Exploited for Spectroscopy (AILES) which extracts the bright FIR synchrotron continuum of the synchrotron facility SOLEIL. These experiments make use of a high resolution (R = 0.001 cm(-1)) Bruker IFS125 Fourier transform (FT) spectrometer. An emission setup (allowing to record spectra of radicals excited at high rotational and vibrational temperatures) and two absorption setups (exploiting the bright synchrotron source at the highest resolution available on the FT) are alternatively connected to the FT. The advantages and limitations of these techniques are discussed on the basis of the recent results obtained on OH and CH radicals. These results constitute the first FIR spectra of radicals using synchrotron radiation, and the first FIR spectrum of a C-bearing radical using FT-spectroscopy.     

An exciplex-halogen high-frequency radiation source on mixtures of krypton and xenon with chlorine molecules

The results of optimization of a broadband ultraviolet (UV) radiation source, which is excited with a transverse radio-frequency low-pressure discharge with a planar aperture, are presented. The UV source operates on Kr-Cl₂ and Kr-Xe-Cl₂ working mixtures. The UV source operates on the system of electron vibrational bands of XeCl* and KrCl* exciplex molecules and chlorine molecules in the spectral range 210–310 nm. The average radiation power reaches 30–50 W at an efficiency of 10–15%.     

激光等离子体软X线光源的研究

本文设计了一种高精度旋转靶系统的激光等离子体软X线光源,亮度高,强度大,光斑尺寸(100～200)μm,脉冲时间几十纳秒,可以辐射出直至软X线的连续光谱及迭加在连续光谱之上的线光谱,峰值波长位于(13～17)nm。在多次测量取平均的方式下,其稳定性和重复性优于±4.5%。