机械式温湿度表测量不确定度评定

本文根据JJG205-2005《机械式温湿度计检定规程》对机械式温湿度计进行不确定度评定;本文分为湿度测量不确定度评定和温度测量不确定度评定两部分。     

温湿度示值误差不确定度评定

按照JJG 205-2005《机械式温湿度计检定规程》的要求,对机械式温湿度计的检定方法进行分析,并从精密露点仪示值误差、被检温湿度计分辨、温湿度检定箱均匀性、波动性等方面引入的不确定分量进行了分析,结合JJF1059.1-2012《测量不确定度评定与表示》的要求,给出了机械式温湿度计示值误差测量结果的不确定度评定。     

机械式温湿度计测量结果不确定度评定

影响机械式温湿度计测量结果的因素很多,本文以标准通风干湿表为标准,采用比较测量的方法对机械式温湿度计进行测量,对此过程中引入的不确定度进行了评定。     

机械式温湿度计湿度测量结果不确定度评定

主要是根据JJG205-2005《机械式温湿度计检定规程》和JJF1033-2008《计量标准考核规范》，对机械式温湿度计湿度的测量结果不确定度进行评定。     

机械式温湿度计校准测量结果不确定度评定

文章对利用标准通风干湿表和温湿度检定箱组成的校准机械式温湿度计的校准结果进行不确定度因素进行分析,主要包括测量重复性、标准器、温度波动度、温度均匀度、湿度波动度和湿度均匀度引入,从而评定机械式温湿度计校准结果的不确定度,对该校准装置的数据分析提供参考依据。     

检定机械式温湿度计的不确定度评定

以机械式温湿度计测量结果为研究对象,论述了机械式温湿度计温湿度测量结果的误差来源及其测量不确定度的分析。     

机械式温湿度计测量结果的不确定度评定

文章以机械式温湿度计的温度、湿度测量值为例,说明其不确定度来源、评定方法及步骤。     

用精密露点仪检定或校准温湿度计时相对湿度误差测量结果的不确定度评定

正本文针对使用较多的Optidew Vision精密露点仪和分度值为2%RH的机械式温湿度计,对湿度误差测量结果的不确定度进行评定。一、湿度误差测量方法和测量模型1.测量方法在恒温恒湿检定箱中,分别快速读取精密露点仪和被检定(校准)的温湿度计的湿度测量结果,用此结果计算被检定(校准)温湿度计的湿度测量误差。     

温湿度计相对湿度测量结果的不确定度评定

本文介绍了温湿度计相对湿度测量结果的不确定度评定.     

温湿度计温度示值误差测量结果的不确定度评定

本文介绍了温湿度计温度示值测量结果的不确定度评定.     

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.