多级离心泵噪声检测不确定度评定

对多级离心泵噪声检测的不确定度进行了评定,涉及不确定度的来源及分析,A类、B类标准不确定度的评定,合成标准不确定度的评定,以及扩展不确定度的评定和噪声检测结果的报告等.     

疏水阀性能试验装置测量不确定度评定

分析了疏水阀试验装置测量不确定度的主要影响因素,采用A类、B类不确定度评定方法对热凝结水排量、漏汽量测量不确定度进行了评定、合成和扩展,结合实例给出了测量不确定度评定结果。     

砝码真空质量值测量结果的不确定度评定

本文以全国砝码质量参数倍量、分量计量比对项目为实例,论述了砝码真空质量值测量结果不确定度的评定方法。对砝码真空质量值的测量方法进行概述,建立数学模型,实际测量被检砝码。对影响测量结果的不确定度来源进行分析,采用了A类评定和B类评定两种不确定度评定方法计算标准不确定度分量;给出合成标准不确定度、扩展不确定度及报告。     

水泵试验结果中的测量不确定度的评定

本文举例说明水泵试验中标准不确定度的A类评定、B类评定、合成标准不确定度的评定方法,为水泵试验结果中测量不确定度的评定提供方法和依据。     

分布光度计测量LED路灯光通量的不确定度评定

为了减少检测的误差,提高检测结果精确度,评定LED路灯光通量的不确定度,分析了用分布光度计法测量LED路灯光通量的影响因素,建立数学模型对测量不确定度进行评定,并计算出A类、B类不确定度,最终给出测试结果的不确定度报告。相对扩展不确定度评定结果为4.13%,置信概率P为99%。结果表明,光谱辐射计的测量误差和标准灯的不确定度所产生的测量不确定度影响因素最大。     

水泵效率测量结果不确定度的评定

通过PTS-3型水泵综合性能测试台进行离心泵效率试验,对随机(A类)不确定度评定、系统(B类)不确定评定、总体(扩展)不确定度进行分析,得出水泵效率测量结果不确定度,为水泵试验台评级提供了重要依据。     

机械产品测量不确定度评定

对测量误差和测量不确定度的基本概念作了简单介绍,并举例说明了测量不确定度A类和B类评定以及测量结果不确定度评定,为机械产品测量不确定度评定提供参考.     

460B热轧带肋钢筋拉伸性能测量不确定度的评定

以φ20 mm 460B的热轧带肋钢筋为例,根据JJF1059-1999技术规范和CSM 01 01 02 01-2006推荐技术和方法,对测量过程中的不确定度来源进行了分析。采用A类、B类的评定方法对各种因素引起的不确定度分量、合成不确定度、扩展不确定度进行了评定,并给出了评定结果。     

DHC2湿度传感器检定结果的不确定度分析

为了提高湿度传感器采集数据的准确性，文章对DHC2湿度传感器检定结果的不确定度进行了分析，参照JJG(气象)003—2011《自动气象站湿度传感器》和JJF 1059.1—2012《测量不确定度评定与表示》,计算并分析检定过程中测得的数值，进行A类和B类不确定度的分析评定，最后计算出合成不确定度和扩展不确定度。所得结果为湿度传感器检定结果的不确定度评定提供参考。     

数字压力计校准结果的不确定度分析

该文按照JJG875-2005《数字压力计》检定规程和JJF1059. 1-2012《测量不确定度评定与表示》的要求,使用标准活塞式压力计,对校数字压力计校准结果进行误差分析,通过计算得到A类不确定度,通过分析得到B类不确定度,进而得到合成不确定度,对其测量结果进行了不确定度的分析与评定。     

Uncertainty of calibration of 2D planar Coordinate Measuring Machine

When the kinematic parameters of 2D planar Coordinate Measuring Machine are calibrated in self-calibration method, it is shown how to estimate the uncertainty of calibration and how to estimate the uncertainty of measurement. In this paper, the uncertainty of probing and the uncertainty of sensors are considered as the contributors of uncertainty. Two different types of CMMs are applied to two different artefacts for calibration and those measures in some different orientations for estimation of uncertainty. The effectiveness of the difference of CMMs, the artefacts and the measurement orientations are compared. As a result, it is proved that the uncertainty distribution is different in the orientation of measurement and the uncertainty could be smaller by selecting measurement orientation.     

基于新一代GPS的产品检验符合性不确定度评定*

新一代产品几何技术规范将测量不确定度的概念拓展至符合性不确定度,但并未给出相对应的评定方法。为全面估计产品检验中测量结果与产品规范所有可能的差异,基于新一代产品几何技术规范,研究产品检验符合性不确定度评定。基于产品几何技术规范定义,提出规范不确定度、方法不确定度、符合性不确定度的评定方法;借助不确定度的黑箱模型,通过测量结果统计学量值特性指标,评定执行不确定度。以产品圆度检验为例,研究符合性不确定度评定操作过程,基于符合性不确定度划分产品检验的合格区间。实例分析结果表明,规范不确定度和方法不确定度的量值与执行不确定度相当,不可忽略;由于符合性不确定度包含测量结果与图纸规范所有可能的不一致性,基于符合性不确定度进行产品合格判定更为可靠。     

Modeling,analysis and optimization of calibration uncertainty in clinical laboratories

Uncertainty in the calibration of a clinical laboratory measurement process has a significant effect on the uncertainty of the measurement result. We develop a mathematical model of the analytical stage of the measurement of serum triglyceride concentration in the clinical laboratory, and use the Monte Carlo method to estimate the net uncertainty associated with this model. We then use the model to study the effect of instrument calibration on the uncertainty of the laboratory measurement result. The effect of the correlation between the parameters of the linear calibration function on the measurement result is quantified using the model. In addition, the effect of the choice of calibrator concentration levels on the measurement result distribution is studied using the model, by studying the effect of the value or the position of the calibrator concentration, and the difference or the distance between calibrator concentrations, on the uncertainty of the measurement result.     

差分光谱法仪器测量不确定度的评定方法

为检验测量结果的可信性、可比性，必须对测量结果的不确定度进行评定。根据监测仪器的测量原理、校准方法分析不确定度的来源，按不确定度评定原则给出测量不确定度的评定方法。     

原子荧光法测定奶粉中砷含量不确定度评定

用测量不确定度表示检测结果是当前国际上约定做法,然而如何对测量结果的不确定度进行合理评定,一直是困扰检测实验室的一个难题。作者依据测量不确定度的评定原则,通过实例,简要地阐述了原子荧光法测定奶粉中砷的不确定度评定方法,对检测领域测量不确定度的评定具有借鉴意义。     

测量误差与测量不确定度的比较应用

文章详细介绍了测量误差和测量不确定度的基本概念以及两者之间的关系,阐述了采用测量不确定度评定测量结果的质量的必然性,旨在正确地了解掌握其实质、以便在工作中能正确地应用测量不确定度的评定与表示。     

对形位误差测量不确定度影响因素的探讨

通过对形位误差测量整个过程进行分析,得出影响形位误差测量结果不确定度的主要因素,并简单概括了研究形位误差测量结果不确定度的一些难点。     

Deducing calibration and measurement capabilities from key comparisons

The Mutual Recognition Arrangement does not explain how the calibration and measurement capabilities of an institute should be deduced from the results of a key comparison. A way is proposed that uses the uncertainty budget of the measuring method and first identifies the main uncertainty contributions. Then, the results of the key comparison are used to support the main parts of the uncertainty budget of a participant. The uncertainty for a wide range of measurement conditions can then be calculated with this approved uncertainty budget. Additionally, the typical uncertainty budget of the method can help to choose the samples or measurement conditions for the comparison that allow checking the main uncertainty contributions independently. The ideas are illustrated by an example from density comparisons.     

圆锥滚子标准件角度不确定度分析

通过对圆锥滚子标准件角度检测结果的不确定度分析,说明该测量系统稳定可靠,测量结果真实可信,测量能力满足使用要求。     

Methods for Optical Shape Measurement and their Measurement Uncertainty

There is a wide spectrum of optical 3-D sensors based on only a few basic principles. We calculate the measurement uncertainty for several “paradigm” methods, by means of the Cramér-Rao lower bound. It turns out that when all other sources of noise are neglected, the shot noise becomes the ultimate limit of the measurement uncertainty and the measurement uncertainty can be traced back to a Heisenberg uncertainty product. Consequently, making one of the factors uncertain, the other factor will become more precise. The different methods vary only by the way how this “uncertainty” is generated.