线圈圈数测量仪校准方法研究

本文介绍线圈圈数测量仪的工作原理和组成,根据线圈圈数测量仪的参数特点,应用现有仪器设备对其校准项目和校准方法进行探讨,并对其进行不确定度进行评定。     

覆层厚度测量仪示值误差测量不确定度评定

该文旨在规范覆层厚度测量仪测量不确定度分析与评定工作,确保测量不确定度评定结果的准确可靠。该文运用国际通用不确定度评定方法,建立测量模型,对以标准厚度片作为标准器校准覆层厚度测量仪示值误差进行了测量不确定度评定,并分析其不确定度分量,以期为广大测量人员提供不确定度分析参考依据。     

泄漏电流测量仪直流漏电流示值误差测量结果不确定度评定

本文根据JJG843-2007泄漏电流测量仪(表)检定规程对泄漏电流测量仪直流漏电流示值进行测量,并对测量过程中不确定度的来源进行分析,对各分量进行了详细量化,计算出该分析方法的合成标准不确定度,并给出结果的扩展不确定度。     

磁偶极矩测量仪现场校准方法研究

阐述了磁偶极矩测量仪的溯源现状和存在困难,针对磁偶极矩测量仪现场校准的需求,通过分析仪器结构和工作原理并结合磁偶极矩测量标准中对测量仪器的溯源要求,研究了用磁偶极矩参考样品校准磁偶极矩测量仪的方法,提出了磁偶极矩测量仪的磁偶极矩示值误差的校准要求以及具体的校准步骤,采用与磁场矢量法校准线圈常数的方式进行验证,并对校准结果的测量不确定度进行了评定。结果表明,该方法校准结果满足企业使用要求,具有操作简单、可现场校准、容易推广的优势。     

静态扭矩测量仪的测量不确定度评定

本文对静态扭矩测量仪的测量不确定度进行了分析和评估,并根据JJG995-2005静态扭矩测量仪检定规程的检定项目及其技术指标,列出其测量不确定度的计算公式。同时提供一评估和计算实例,为该种计量器具的校准工作提供了不确定度方面的参考。     

静态扭矩测量仪的测量不确定度评定

本文对静态扭矩测量仪的测量不确定度进行了分析和评估,并根据JJG995-2005静态扭矩测量仪检定规程的检定项目及其技术指标,列出其测量不确定度的计算公式.同时提供一评估和计算实例,为该种计量器具的校准工作提供了不确定度方面的参考.     

线圈圈数测量仪校准方法的探讨

介绍了线圈圈数测量仪的校准方法,确定了测量圈数示值误差、位置影响试验两项校准项目,并提出了各项性能指标要求。对不同生产厂家的线圈圈数测量仪采用该校准方法进行了验证。结果表明,该校准方法可以作为评价线圈圈数测量仪计量性能的有效方法。     

试验筛影像测量新方法及其测量不确定度分析

本文对使用接触法和非接触法测量试验筛进行了对比研究,并重点介绍了用影像测量仪检测试验筛的最新方法和专用软件;建立了影像测量试验筛的测量不确定度模型,并对影像测量仪检测/校准试验筛孔径的测量不确定度进行了分析计算,通过实验验证了影像测量试验筛的可靠性.     

垂直轴偏差测量仪的校准及示值误差的不确定度评定

根据垂直轴偏差测量仪的应用需求,提出了一种用专用圆柱直角尺校准垂直轴偏差测量仪示值误差的校准方法,并进行了示值误差的测量不确定度评定。结果表明,该方法校准垂直轴偏差测量仪的扩展不确定度满足使用要求。     

影像测量仪尺寸测量误差的不确定度评定与表示

通过对影像测量仪尺寸测量误差建立测量模型,分析评定了用玻璃线纹尺测量影像测量仪尺寸测量误差的过程,运用不确定度评定与表示方法,给出了影像测量仪尺寸测量误差扩展不确定度的结果。     

Estimation of Parameters of Universal Distribution of Moments of Failure of Products

A method is proposed for estimating the parameters of a mixture of exponential and Weibull distributions for which the accuracy of preliminary estimates obtained by graphical analysis is refined in accordance with the criterion of maximum likelihood. The efficiency of the proposed method is supported by the results of statistical modeling.     

Analysis of the rate of propagation of the wave of change of boiling modes

An approximate analytical expression is derived for the velocity of the front of the wave of change of boiling modes on a rod and on a plate. The impact of the Thomson effect and of the heater orientation in the gravity field is included. Adequate agreement is demonstrated between the derived relations and experimental data.     

Evaluation of optical properties of highly scattering media by moments of distributions of times of flight of photons

A novel method for the determination of the optical properties of tissue from time-domain measurements is presented. The data analysis is based on the evaluation of the first moment and the second centralized moment, i.e., the mean time of flight and the variance of the measured distribution of times of flight (DTOF) of photons injected by short (picosecond) laser pulses. Analytical expressions are derived for calculation of absorption and of reduced scattering coefficients from these moments by application of diffusion theory for infinite and semi-infinite homogeneous media. The proposed method was tested on experimental data obtained with phantoms, and results for absorption and reduced scattering coefficients obtained by the proposed method are compared with those obtained by fitting of the same data with analytical solutions of the diffusion equation. Furthermore, the accuracy of the moment analysis was investigated for a range of integration limits of the DTOF. The moment analysis may serve as a comparatively fast method for evaluating optical properties with sufficient accuracy and can be used, e.g., for on-line monitoring of optical properties of biological tissue.     

可燃气体检测报警器测量结果的不确定度评定

本文详细介绍了可燃气体检测报警器示值误差测量结果的不确定度评定方法。     

水三相点复现的不确定度评定

水三相点是开尔文热力学温度的唯一基准点，也是ITS-90国际温标重要的定义固定点。因此，水三相点不确定度分析对整个温标的建立、温度量值传递起着至关重要的作用。近3年来，中国计量科学研究院研制出一系列高质量的水三相点容器，加强了水三相点的研究，为不确定度的分析提供了更为可靠的实验依据。同时，不确定度的分析也是客观评价新研制容器性能的一个重要指标。因此，根据实验结果对新研制容器所复现的水三相点进行了不确定度评定。评定结果表明，其扩展不确定度为0．16mK(k=2．69，P=0．99)。     

心电图机电压测量示值误差测量值的不确定度评定

本文介绍了心电图机电压测量示值误差测量值的不确定度评定与表示方法。     

Estimation of potentialities of methods of summation of direct measurement errors

Conventional methods for summation of direct measurement errors are considered. Conditions under which these methods provide consistent results are stated. It is proposed to utilize for characteristic of the total error, its interval estimator or the half-sum of the value obtained by adding up its arithmetic and geometric random errors.Translated from Izmeritel'naya Tekhnika, No. 4, pp. 10–12, April, 1995.