共查询到20条相似文献,搜索用时 4 毫秒
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George Eppeldauer 《Journal of research of the National Institute of Standards and Technology》1998,103(6):615-619
A new method is described to calibrate tristimulus colorimeters for high accuracy color measurements. Instead of traditional lamp standards, modern, high accuracy detector standards are suggested for calibration. After high accuracy absolute spectral response determination of the tristimulus receivers, color (spectral) correction and peak (amplitude) normalization can minimize uncertainties caused by imperfect realizations of the Commission Internationale de l’Eclairage (CIE) color matching functions. As a result of the corrections, stable light sources of different spectral power distributions can be measured with an accuracy dominated by the sub tenths of a percent uncertainty of novel spectral response determinations. 相似文献
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通过模拟电阻的有关原理阐述,提出对模拟电阻的校准不仅要考虑激励电流大小的影响,也要考虑激励电流方向的影响。提出了针对不同等级的模拟电阻采用不同的校准设备,以提高工作效率。对模拟电阻校准进行了GUM法和MCM法测量不确定度评定,评定结果基本一致,说明测量不确定度评定合理。通过对测量不确定度的验证,证明校准方法的可行性和实用性。 相似文献
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为了消除标量网络分析仪在测量过程中的系统误差.提高测量精度,采用误差分析及校正模型.用数值分析的方法去除系统误差,降低随机误差.理论计算和实际测量结果都表明,测量精度明显提高.该误差分析理论及误差测量方法在标量网络分析仪中得到了较好的应用.提高了仪器的性能. 相似文献
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金尚忠 《中国计量学院学报》1995,(2)
本文研究了遥控器用红外LED辐射强度和遥控距离的测量,研制了光电探测器,建立了测试仪,分析了仪器的定标.仪器测试辐射强度的精度为7.94%。测量的遥控距离与实际用遥控器启动接收器的结果是一致的. 相似文献
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为了实现对近景目标物的三维测量,研制了一种小型仿生复眼系统。介绍了该复眼系统的结构及其参数设计原则,并对该系统采用的标定、三维测量等算法进行研究。首先根据复眼成像特点搭建了标定和测量平台,并分别使用张正友的方法、直接线性变换法、Tsai式两步法三种摄像机标定方法对复眼的中心子眼进行标定,通过比较实验结果发现Tsai式标定方法精度更高,更适用于本复眼系统的标定。然后针对边缘子眼光轴与图像传感器不垂直问题,提出了一种新的图像畸变数学模型,有效的提高了边缘子眼的标定精度。最后建立了多子眼三维探测模型,并探索了多子眼成像对复眼相机测量精度的影响,认为三子眼可获得比双子眼更高的精度和稳定性。实验结果表明,在距离复眼相机150?260 mm范围内,该复眼探测系统的三维测量相对误差在2%左右,在满足仪器小型化的同时能基本实现近景三维测量。 相似文献
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目前,国内尚无针对CNC数控机床在线测量系统的相关的标准和校准规范。为统一技术要求,本文研究了CNC数控机床在线测量系统的工况条件及其计量特性参数,提出了有别传统三坐标测量机校准方法的校准方案,研制了符合基于公差带位置判别废品原理的标准器组,以在线测量系统的测工件的方式,反向校准CNC在线测量系统的尺寸精度,解决其量值溯源问题。 相似文献
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Abstract: This study describes the calibration of a full-field speckle interferometry strain measurement system using the calibration specimen and protocol defined in the Standardisation Project for Optical Techniques of Strain measurement (SPOTS) standard. The specimen was based on the monolithic embodiment of a four-point bending test and was manufactured from aluminium following the SPOTS design. Strain-gauge rosettes attached to the upper and lower faces of the beam were used to derive two correction factors of an analytical expression that predicted the strains generated in the gauge section of the beam. Following the SPOTS protocol, the comparison of measured and predicted strains yielded two fit parameters and their associated uncertainties for each of three displacement-load steps which indicated the closeness of the data sets. An acceptable calibration was achieved for the single normal component of in-plane strain considered in this study, for each load step employed. For the highest load range, which generated a maximum strain of approximately 810 μ strain in the gauge section, the overall calibration uncertainty was found to be 35.3 μ strain, which in relative terms can be expressed as 2.2% of the strain measurement range for which the instrument was calibrated. 相似文献
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