共查询到19条相似文献,搜索用时 109 毫秒
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分光计的观测系统可归纳由三个平面构成:读数平面、观测平面、待测光路平面.读数平面由主刻度盘和游标内盘绕中心转轴旋转时形成.对于每一台具体分光计,读数平面都是固定的,且和中心主轴垂直;观测平面由望远镜主光轴绕分光计中心转轴旋转时所形成的,只有当望远镜光轴与中心转轴垂直时,观测面才是一个平面,否则将形成一个以望远镜光轴为母线的圆锥面; 相似文献
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利用光学实验中常用的分光计、偏振器和自制的读数盘通过组装搭建形成一种可以用来测量偏转角和旋光率的系统(简称直读式分光计旋光仪)。利用该系统测量了蔗糖旋光率,与传统的WXG-4旋光仪比较,实验结果的相对误差小于0.3%。实验现象明显,读数方便快捷。通过MATLAB分析了WXG-4型旋光仪和自制旋光仪实验数据,发现两种数据相似度极高。该自主改装的"直读式分光计旋光仪"可以作为一种测量糖溶液旋光率的新方法。 相似文献
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用精密角度传感器代替了原来的机械角度盘,用硅光电池来接收光强分布,通过数字显示器接收角度传感器的角度变化电信号和偏振光强分布,直观地显示出偏振光实验的光强变化波形和数字读数.并对设计的偏振光实验仪进行相关实验的测量,测量精度能达到较高的要求. 相似文献
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正确调节分光计对减小角度测量误差十分重要。望远镜光轴与分光计中心轴垂直的调节是产生测量误差的重要因素之一,文中分析了调节误差的产生原因,理论上给出了角度测量误差与调节误差的定量关系。 相似文献
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A. A. Velásquez J. M. Trujillo A. L. Morales J. E. Tobon L. Reyes J. R. Gancedo 《Hyperfine Interactions》2005,161(1-4):139-145
An autonomous control system for Mössbauer spectrometry based on two modules has been designed and built. The first module operates as a multichannel analyzer for the acquisition and storage of spectra, and the second one is a driver unit which controls and supplies the power for the velocity transducer. A microcontroller executes the digital control algorithm for the velocity transducer motion and manages the data acquisition and storage tasks. The user can monitor the system from an external PC through the serial port. A graphic interface made with the LabVIEW software allows the user to adjust digitally the control parameters for the velocity transducer motion, the channels number, to visualize as well as save spectra in a file. The microcontroller can be reprogrammed from the PC through the same serial port without intervention of a universal programmer, which allows the user to make proper software for different applications of the system. The system has been tested for linearity with several standard absorbers yielding satisfactory results. The low cost of its design, construction and maintenance make this equipment to be an attractive choice when assembling a Mössbauer spectrometer. 相似文献
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We present a simplified digital time differential perturbed γ???γ angular correlation (TDPAC) spectrometer that demonstrates that such instruments can be built using primarily commercial components and with relatively modest coding effort. The system handles data rates of 70 kcps/detector with a timing resolution of better than 500 ps, and has been used with both 111In and 181Hf. 相似文献
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普朗克常数是物理学中一个重要的常数,利用测角仪器分光计,探索用玻尔氢原子理论来测普朗克常数。根据最小偏向角测量三棱镜折射率的原理,利用分光计测量三棱镜的折射率来研究光的色散规律,测量棱镜材料对不同波长入射光的折射率,得到棱镜材料的色散曲线和拟合方程。根据玻尔的氢原子理论,用分光计测出氢原子光谱四条谱线(α,β,γ,δ)的偏向角对应的折射率,由科西经验公式计算出相应的波长。 相似文献
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紫外-真空紫外成像光谱仪在我国空间探测中的应用越来越广,在其研制过程中需对其进行校准,但目前国内尚无针对紫外-真空紫外成像光谱仪的计量标准,无法保证测量结果的准确可靠。该文设计了一种紫外-真空紫外成像光谱仪校准装置,实现对紫外-真空紫外成像光谱仪的光谱范围、波长、光谱响应度、空间角分辨率、均匀性等参数的校准。经测试验证,波长测量不确定度为0.080 nm(k=2),光谱响应度测量不确定度为6.8%(k=2),空间角分辨率测量不确定度为0.022 mrad(k=2),均匀性测量不确定度为4.2%(k=2)。 相似文献
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机载光电系统稳定精度测试方法研究 总被引:2,自引:0,他引:2
提出了一种实时高频角位移测量的新方案,采用该方案可对机载光电系统动态稳定精度进行测试。该方案采用激光自准直测量,以及高精度、高响应频率PSD探测器传感稳定平台的角位移,有效解决了频率达500Hz角振动状态下的稳定精度测量。与传统的脱靶量测试方法相比,精度提高了几个数量级,优于10μrad。该方法可用于机载高精度稳定平台稳定精度的实时测量。 相似文献
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OPENCORE NMR: open-source core modules for implementing an integrated FPGA-based NMR spectrometer 总被引:1,自引:0,他引:1
Takeda K 《Journal of magnetic resonance (San Diego, Calif. : 1997)》2008,192(2):218-229
A tool kit for implementing an integrated FPGA-based NMR spectrometer [K. Takeda, A highly integrated FPGA-based nuclear magnetic resonance spectrometer, Rev. Sci. Instrum. 78 (2007) 033103], referred to as the OPENCORE NMR spectrometer, is open to public. The system is composed of an FPGA chip and several peripheral boards for USB communication, direct-digital synthesis (DDS), RF transmission, signal acquisition, etc. Inside the FPGA chip have been implemented a number of digital modules including three pulse programmers, the digital part of DDS, a digital quadrature demodulator, dual digital low-pass filters, and a PC interface. These FPGA core modules are written in VHDL, and their source codes are available on our website. This work aims at providing sufficient information with which one can, given some facility in circuit board manufacturing, reproduce the OPENCORE NMR spectrometer presented here. Also, the users are encouraged to modify the design of spectrometer according to their own specific needs. A home-built NMR spectrometer can serve complementary roles to a sophisticated commercial spectrometer, should one comes across such new ideas that require heavy modification to hardware inside the spectrometer. This work can lower the barrier of building a handmade NMR spectrometer in the laboratory, and promote novel and exciting NMR experiments. 相似文献