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E. G. Mironov 《Measurement Techniques》2005,48(3):311-313
The relative and reduced errors of measurement provisions and the relative errors of measurements are considered. Analytical expressions are provided that make it possible to evaluate the errors in question. Conclusions and practical recommendations are given.Translated from Izmeritel’naya Tekhnika, No. 3, pp. 71–72, March, 2005. 相似文献
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A solution is proposed for the problem of statistical analysis of a sum of random measurement errors or the result of indirect measurements based on the Monte-Carlo method using an algorithm that generates correlated samples of random quantities with various distributions. 相似文献
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散射角对相关光谱法纳米颗粒测量的影响 总被引:1,自引:0,他引:1
研究散射角对相关光谱法纳米颗粒测量的影响,对相关光谱法纳米颗粒实验系统进行改造,实现不同的散射角下纳米颗粒的相关光谱法测量.实验采用30 nm和200 nm的混合颗粒群,按不同比例进行混合,在90°和165°散射角对混合颗粒群进行测量,并对此实验结果进行了理论分析,结果表明,在对单一颗粒群进行测量时,在两个角度都能实现颗粒的准确测量,而在混合颗粒群测量时,测量结果受两种颗粒群混合比影响,而165°散射角具有更好的测量结果,因此在对混合纳米颗粒群进行测量时,采用大的散射角有助于颗粒的反演. 相似文献
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由于测量误差的存在,再加被测量自身定义和误差修正的不完善等缘故,被测量的真值难以准确复现,测量结果带有不确定性,因此用测量不确定度来评定测量结果的质量高低。本文通过对二级角度块测量过程中的不确定度进行分析评定,找出影响不确定度的主要因素,为实验室质量控制、科学判定测试结果提供科学依据。 相似文献
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通过对渐开线内花键棒间距和渐开线外花键跨棒距的计算公式分别进行微分,推导出压力角的关系式。又分别求得其它结构主参数的测量和计算方法并举例说明。 相似文献
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影像分析法接触角仪测量标准样板时的不确定度评定 总被引:1,自引:0,他引:1
本文分析了影像分析法接触角仪测量自制标准样板时主要的不确定度来源,并在对各不确定度分量进行分别评定的基础上,给出了扩展测量不确定度.评定结果表明,影像分析法接触角仪测量标准样板的不确定度大约在(0.5~1.0)*.其中,因基线位置的不确定性和液滴轮廓线拟合方法不同导致的测量结果变异是测量不确定度最主要的来源. 相似文献
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Douglas B. Thomas Edward F. Zalewski 《Journal of research of the National Institute of Standards and Technology》1990,95(5):533-543
A total of fifteen laboratories participated in the CIE detector response intercomparison which was designed to assess the level of agreement among participating laboratories in the absolute measurement (with respect to SI) of photodetector response in the visible spectral region. Most participants were either commercial laboratories or university laboratories with the National Institute of Standards and Technology (NIST) serving as the host laboratory. Each laboratory determined the absolute response of each of two silicon photodiode radiometers which were designed for the intercomparison by NIST. Approximately two-thirds of the laboratories reported response values which agreed with the NIST values to within ±1.0% at the two wavelengths of 488 and 633 nm.3 相似文献
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压力变送器的检定一般是以活塞压力计为标准建标,但是现场检定/校准中使用数字压力计更为方便,如果使用此方法会带来不同量程、精度等级的数字压力计传感器的检定/校准能力的问题,本文就将此问题做一个粗略的演算,使现场检定/校准工作更为合理有效。 相似文献