一体化温度变送器测量结果不确定度评定

建立了检定或校准一体化温度变送器直流信号输出的数学模型,分析了标准不确定度分量的来源和大小,给出一体化温度变送器测量结果不确定度的评定的结果。     

热电阻用温度变送器输出值误差的测量结果不确定度评定

详细阐述了热电阻用温度变送器输出值误差的测量结果不确定度的测量方法、测量模型、标准不确定度的评定、合成不确定度和扩展不确定度的评定方法。     

温度变送器测量结果不确定度的评定

本文阐述了温度变送器测量结果的不确定度评定方法和步骤。     

带传感器的温度变送器测量结果不确定度评定

介绍了带传感器的温度变送器测量结果不确定度评定,以实例进行了分析,具有一定的参考价值.     

压力变送器示值误差测量结果的不确定度评定

文章根据JJG 882—2004《压力变送器检定规程》要求,结合实际检定工作,应用测量不确定度理论,分析了压力变送器示值误差的测量结果不确定度来源,并给出了不确定度评定方法和报告。     

一体化温度变送器现场校准

一体化温度变送器具有测量准确度线性好,方便远距离传输等优点,正逐渐广泛应用在工业生产的各个领域。通过比较现场校准结果和实验室校准结果以及测量不确定度评定,评价现场校准一体化温度变送器装置的计量性能以及测量结果分散性是否符合相关要求。根据实验结果,利用现场校准装置可以校准准确度为0.5级及以下的一体化温度变送器。     

温度变送器测量不确定度评定

结合单位实际检测工作,依据JJF 1183—2007《温度变送器校准规范》和计量基础知识与专业规范,对温度变送器测量不确定度进行了评定。评定结果对于温度变送器的校准工作具有重要指导意义。     

带传感器温度变送器测量值的不确定度分析与评定

本文针对带铂电阻温度变送器的校准过程及校准结果,依据JJF1059.1-2012《测量不确定度评定与表示》对其校准结果的不确定度进行了分析与评定,以期在不确定度给出时提供技术上的参考依据。     

压力变送器校准及不确定度评定浅析

压力变送器在不同测控领域中广泛应用,压力变送器在测量压力、流量、液位信号等方面需求突出,在实际的测量中为了保证压力变送器的测量准确性,需要研究校准的不确定度。文章对压力变送器工作原理进行介绍,分析测量方法,对校准结果进行不确定度的评定,并简要分析不确定度评定中一些被省略的不确定度分量。     

温度变送器测量不确定度评定

测量不确定度的含义,温度变送器测量不确定度的来源以及评定方法。     

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.     

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.     

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.     

卧式金属罐容量的测量结果不确定度

本文根据多年的实践检定经验 ,参照JJF1 0 59- 1 999《测量不确定度评定与表示》以及《测量不确定度表达 1 0讲》 ,对卧式金属罐容量的测量结果不确定度进行了评定。     

盐酸浓度不确定度的评估

通过对盐酸浓度标定的过程分析，找出影响结果的各个分量，进行不确定度的评定，按照计量技术规范给出标准的表示法。     

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.     

空压机轴承箱蜗壳温度探头油封改造

由于空压机进气侧轴承箱蜗壳温度探头密封效果不好,使空压机及其后续管道受到油污染。后将温度探头的O形圈密封改为骨架油封,杜绝了轴承箱漏油问题。文章简介空压机的结构和技术参数,详细介绍了骨架油封的制作和优点。