电致荧光成像表征串联电阻分布

本文介绍了一种利用电致荧光成像表征太阳能电池串联电阻分布的方法.太阳能电池的电致荧光强度φi与外加电压U呈现指数关系,而U-n·(1+Rsi/RPi)·UT·1n(φi)和φi呈现直线关系,其斜率与串联电阻值相关,我们通过拟合二者的直线关系和一些计算得到了串联电阻的分布,我们在一片单晶硅电池上测试并拟合,证实了这种方法的可靠性,此外,我们的拟合结果中还包含了复合分布以及漏电分布.     

基于耦合波理论的三维电场反演算法

提出了一种测量空间三维电场方向的测量方法,设计了利用单个BGO晶体,三条光路的电场方向测量装置。通过对线性电光效应耦合波理论内容的研究,利用MATLAB软件编写了相关仿真程序,分析了电光效应的过程。在块状晶体中设置波长不同、入射方向不同的三条光路,分别计算空间各方向电场对光路出射光强度的调制结果,建立对应光路的输出光强度空间分布数据库。在测量电场方向时,利用各光路出射光强度测量值在数据库中进行坐标有序匹配确定外电场方向。测量系统无源,响应时间短、精度高。实现了理论上对电场强度不变的情况下,三维电场方向的测量。     

最新发明专利信息

分色棱镜的透射率测量装置 G01J 1/10 CN 1069572 A 日本岛津制作所 1992.7.28 该装置包括:用于测量在入口路径进入积分球的光强度的光电倍增管和积分球,其中设置入口路径与入射路径的延长部分相分离,位于包括入射路径延长部分和三个出射路径的四路径之一的第一可动反射镜,用于将每一路径上的光反射到第二可动镜上;位于所述积分球的入口路径上     

检测宽量程光电系统非线性的光强递推法

光电系统的非线性检测因涉及光辐射的绝对计量而成为光电测量中的难题之一。本文根据任一介质片的透过率应与入射光强度无关的原理提出了一种间接测量方法——光强递推法。文章重点论述了此法的原理、方法和特点,并介绍了相应的实验装置和要点。最后,作为应用说明,给出了两则实例和结果。     

光纤位移传感器

随着高质量光导纤维的出现,许多光导纤维器件相继问世。强度调制声光传感器也引起人们极大的关注。这种传感器可以建立在单模光纤端面的反射光强度调制的基础上,此时光线入射在光纤上的角度必须满足全反射条件。强度调制传感器也可以利用两根多模光纤之间     

利用晶体多重衍射进行同步辐射光子能量标定

介绍了多重衍射的基本原理,包括多重衍射的指标化、衍射光强度的计算和入射光方向的确定,并根据晶体多重衍射现象提出了入射X光能量的标定方法.从理论上讲,使用该标定方法在角度扫描精度为1"时,光子能量标定精度可达到1 eV.在上海光源14B衍射光束线上对提出的标定方法进行了实验验证,在10 keV处用Si(111)为主衍射收...     

可编程光频转换器TSL230及其应用

ＴＳＬ２３０可编程光／频转换器是新一代智能传感器,它在单片电路中集成了一个可配置的硅光电二极管和一个电流／频率转换器,可直接输出正比于入射光强度的频率信号,该器件能直接和微处理器接口,以极低的代价实现较高精度的光强检测和光强信号的数字化文中介绍了ＴＳＬ２３０的主要性能和使用方法。     

SMP-03型显微光度计常见故障及排除方法

<正> 该光度计是德国蔡司(ZEISS)公司产品,它利用光效应原理,在显微镜下垂直入射到被测物体表面的光强度被反射后,进入光电倍增管转换为电量,从而测量物体的反射率。广泛应用于石油、冶金、矿产等科研部门,此型号显微光度计虽是80年代初引进的,但现仍在使用者为数不少。这时举几例该机常见故障及排除方法。     

SI太阳能电池温度特性测量装置的设计

通过对半导体制冷原理及温度对太阳能电池主要表征参数影响等的讨论,解决了LED光源驱动、散热、太阳能电池温控等技术问题,设计出太阳能电池的温度特性测试装置,并利用该装置对Si太阳能电池特性参数进行了测量,测试结果与理论讨论相符,对提高太阳能电池的生产工艺水平和研究太阳能电池片的性能有重要参考价值。     

彩色钙钛矿太阳能电池的Fano微纳砷化铝光栅模拟设计

针对彩色钙钛矿太阳能电池的美学特征,对该太阳能电池的纳米级色彩调节进行了研究.利用Fano共振原理以及在钙钛矿太阳能电池中采用Fano微纳砷化铝光栅结构,模拟出了不同色彩的钙钛矿太阳能电池.模拟结果表明,调节Fano微纳砷化铝光栅结构的周期和槽深,可控制钙钛矿太阳能电池的反射峰位置和峰宽,并且峰位的控制精度达到了1 n...     

Study on the effect of measuring methods on incident photon-to-electron conversion efficiency of dye-sensitized solar cells by home-made setup

An experimental setup is built for the measurement of monochromatic incident photon-to-electron conversion efficiency (IPCE) of solar cells. With this setup, three kinds of IPCE measuring methods as well as the convenient switching between them are achieved. The setup can also measure the response time and waveform of the short-circuit current of solar cell. Using this setup, IPCE results of dye-sensitized solar cells (DSCs) are determined and compared under different illumination conditions with each method. It is found that the IPCE values measured by AC method involving the lock-in technique are sincerely influenced by modulation frequency and bias illumination. Measurements of the response time and waveform of short-circuit current have revealed that this effect can be explained by the slow response of DSCs. To get accurate IPCE values by this method, the measurement should be carried out with a low modulation frequency and under bias illumination. The IPCE values measured by DC method under the bias light illumination will be disturbed since the short-circuit current increased with time continuously due to the temperature rise of DSC. Therefore, temperature control of DSC is considered necessary for IPCE measurement especially in DC method with bias light illumination. Additionally, high bias light intensity (>2?sun) is found to decrease the IPCE values due to the ion transport limitation of the electrolyte.     

A computer vision system for the inspection of light emitting diodes

This paper outlines the development of a computer vision system to enhance classification criteria for the inspection of infrared light emitting diodes (LEDs). Infrared LEDs used for fibre optics and optical switches are presently classified solely on the basis of power output. This test is performed by focusing the light beam from the LED through a circular aperture onto a solar cell. The output current from the solar cell is translated into a power output reading for the LED. The approach is limited in that it provides no information about other characteristics such as the misalignment of the beam from the mechanical centre or the intensity distribution of the beam. Improved classification criteria and testing methods based on emitted light intensity distribution can be utilised in engineering revision, setting specifications, monitoring manufacturing problems and classification for different applications.     

典型形状飞行器反射光强的计算

用光学系统探测和跟踪各种飞行器时,对目标的可测性(作用距离),系统的信噪比起至关重要作用的物理量是飞行器在探测方向上的光强或辐射强度。它除了与入射光的照度或辐照度、飞行器表面的反射率、飞行器形状有关以外,还与入射光、观测方向和飞行器三者之间的几何关系有关。本文分别对平面、球面、圆柱面和圆锥面等典型形状计算了不同几何关系下的反射光强,然后计算了火箭形状飞行器的反射光强。     

一种简易光谱实验仪的设计与实现

针对传统光谱仪在实验教学方面存在的问题,设计了一种成本低、体积小的简易光谱实验仪。该光谱实验仪可以探测340¹ 000nm光谱范围内的光。基于光敏三极管良好的光电特性和光谱特性,用中心波长不同的窄带滤光片将入射光分光后分别照射到相应的光敏三极管上。定量反映光照度的各光敏三极管所产生的光电流,经电路转换成电压并放大后被计算机实时采集,利用相应VB程序的处理,在程序界面上实时呈现光谱图。通过探测卤钨灯的光谱,与传统光谱仪探测的光谱图相比较,观察得到两者光谱图包络基本一致,满足了教学实验仪的需求。     

Compact resonance absorption spectrometer to monitor the profile of the solar He 58.4 nanometer line

A miniature resonance absorption spectrometer is able to perform a routine monitoring in space of the line profile and intensity of the He i resonance line from the solar disk with a time resolution of about 1 min and a spectral resolution of 10(5). It consists of a predispersive spectrometer incorporating a helium gas absorption cell. The instrument has been designed to meet a small size and weight. It was tested on a rocket flight in June 1976. The construction, principles of operation, and laboratory calibration of the instrument are presented. Its capability to resolve details of the order of 0.3 pm FWHM and its sensitivity to the intensity of line wings three order of magnitudes fainter than the peak of the line have been established by laboratory investigation.     

Balloon-borne disposable radiometer for cloud detection

A low cost, disposable instrument for measuring solar radiation during meteorological balloon flights through cloud layers is described. Using a photodiode detector and low thermal drift signal conditioning circuitry, the device showed less than 1% drift for temperatures varied from +20 °C to -35 °C. The angular response to radiation, which declined less rapidly than the cosine of the angle between the incident radiation and normal incidence, is used for cloud detection exploiting the motion of the platform. Oriented upwards, the natural motion imposed by the balloon allows cloud and clear air to be distinguished by the absence of radiation variability within cloud, where the diffuse radiation present is isotropic. The optical method employed by the solar radiation instrument has also been demonstrated to provide higher resolution measurements of cloud boundaries than relative humidity measurements alone.     

LOW FLYING HEIGHT MEASUREMENT WITH MULTI-WAVELENGTH INTERFEROMETRY

A method for measurement of ultra-low flying height in head-disk spacing is described. Three different wavelengths are selected out from white light by filters to measure the spacing simultaneously. Besides solving the ambiguity problem, a more reliable result is achieved by using weighted average of measurement results from three different wavelengths, where the weight is dependent upon spacing. Fringe-bunching correction algorithm （FBC） and spot-tilling technique are adopted to suppress calibration and random errors. Moreover, incident bandwidth correction （IBC） method is introduced to compensate the error caused by low monochromaticity of incident light. Based on dynamic flying height tester （DFHT Ⅱ）, with the redesigned of photo-electric conversion and signal acquirement module, an instrument has been developed. And comparing the experimental data from the instrument with those from a KLA-FHT D6, the discrepancy is less than 5%. It indicates that the instrument is suitable to perform ultra-low flying height measurement and satisfies the reauirement of magnetic heads manufacturing.     

瞬态光强测试仪在烟火药脉动燃烧中的应用

基于烟火药脉动燃烧的特点,采用瞬变光强测试仪对烟火药脉动燃烧过程的光强变化进行测试研究,通过计算得出其脉动燃烧的频率,结果表明瞬态光强测试仪能够较好地对烟火药脉动燃烧的特征进行评价。     

High saturation solar light beam induced current scanning of solar cells

The response of the electrical parameters of photovoltaic cells under concentrated solar irradiance has been the subject of many studies performed in recent times. The high saturation conditions typically found in solar cells that are subjected to highly concentrated solar radiation may cause electrically active cell features to behave differently than under monochromatic laser illumination, normally used in light beam induced current (LBIC) investigations. A high concentration solar LBIC (S-LBIC) measurement system has been developed to perform localized cell characterization. The responses of silicon solar cells that were measured qualitatively include externally biased induced cell current at specific cell voltages, I(V), open circuit voltage, V(oc), and the average rate of change of the cell bias with the induced current, DeltaV/DeltaI(V), close to the zero bias region. These images show the relative scale of the parameters of a cell up to the penetration depth of the solar beam and can be obtained with relative ease, qualifying important electrical response features of the solar cell. The S-LBIC maps were also compared with maps that were similarly obtained using a high intensity He-Ne laser beam probe. This article reports on the techniques employed and initial results obtained.     

太阳电池测试仪中数学模型的建立

对太阳电池测试仪中应用的单指数数学模型和双指数数学模型进行了较深入的研究。用参数可分离非线性最小二乘拟合方法，根据少量测量数据较准确地求得了太阳电池双指数数学模型。该数学模型的建立，对研究太阳电池特性，求解太阳电池等效数，完整绘出太阳电池伏安特性曲线有着重要意义。