Investigation of the Electrophysical Characteristics of SF6Gas: Obtained Results

The radiation-induced electrical conductivity of SF₆gas is experimentally investigated at different pressures. The dependences of the coefficient of attachment of electrons to SF₆molecules on the E/Nratio are determined. The obtained results are compared with the results of numerical calculation by the Monte Carlo method and with the data of other authors.     

Electrophysical Characteristics of a Posistor Block

The influence of the parameters of posistor elements and the conditions of their heat exchange on the electrical and dynamic characteristics of a posistor block have been investigated. Good agreement between calculation results and experimental data has been established.     

Investigation of the Electrophysical Characteristics of SF6Gas: The Effect of Electrode Layers on the Measurement Accuracy

The effect of the electrode layers of a space charge on the accuracy of determination of the intensity of the electric field in an ionization chamber described in [1] is treated. It is demonstrated that the measurement error at the SF₆gas pressure ranging from 10 to 100 torr does not exceed 3%.     

A Procedure for Measuring and Validating Samples of Electrical Conductivity

The possibility of using an eddy-current transducer to measure the electrical conductivity by an absolute (nonstandard) method, based on a solution of the inverse problem for the case of a coil with a current placed on the surface of a conducting nonmagnetic half-space is considered. A block diagram of the equipment, the construction of the eddy-current transducer, calibration curves and an analysis of the measurement errors are presented. The method is compared with the bridge method of measurement. __________ Translated from Izmeritel'naya Tekhnika, No. 9, pp. 59–65, September, 2005.     

一种简便测量同轴度的通用程序

本文介绍了一种测量同轴度的简便方法,给工件测量同轴度提供了一种准确而效率高的通用程序,对零部件此类项目的测量有着重要的作用。     

Algorithms for Measuring the Quality of Products and Their Characteristics

The principles of synthesizing algorithms for measuring the quality of products are presented on the basis of the mean arithmetic, geometric, harmonic, and other components. The fundamental provisions for measuring the initial information utilizing virtual standards are discovered. A method based on a numerical experiment is proposed for verifying the effectiveness, validity, and bias of algorithms for measuring the quality of products and expressions are given for a generalized algorithm for measuring the quality of products which makes it possible to obtain the most effective and unbiased results.     

A Procedure for Measuring Mass Flow Rate Using Critical Nozzles

A new approach to measuring mass flow rate using critical nozzles is proposed. The novelty of the approach lies in the fact that the laws of conservation (of mass, energy and momentum) in the one-dimensional gas flow are matched and the dependence of the thermal characteristics of an actual gas (the adiabatic exponent and the compressibility) on the static pressure and the temperature in the gas flow is taken into account. The VNIIMS procedure and algorithm are presented and are illustrated using a specific example.     

Investigations of the Decaying Plasma of Electronegative Gases

The influence of different processes on the decay of a lowpressure plasma containing negative ions is discussed. Experimental results and calculations modeling the decay of a multicomponent plasma are given. The problems of creation of ionion sources are considered.     

Procedure for Estimating Errors of Measuring the Parameters of Camshafts and Crankshafts Using a Plane Tappet

An analysis has been made of the monitoring parameters of camshafts (master cams) and of the permissible errors in measuring them. A list of errors is determined, mathematical models are developed for them and their permissible values are designated. Calculations carried out together with experimental checks of these measurement errors have revealed satisfactory agreement between the combined calculated and experimental error values.     

Method and Device for Measuring the Thermophysical Characteristics of Regenerative Products

A physical and mathematical model of a method and a device were developed for measuring the thermophysical properties of regenerative materials. The design of a measuring device was developed and the device was fabricated on the basis of the mathematical model of the measurement method. The thermophysical properties of a regenerative product were investigated experimentally.     

测量仪器国产化背景下基于研制生产过程计量控制的合格评定程序

以计量技术为核心,探索适用于我国测量仪器的合格评定程序,将计量技术融入测量仪器产品的质量形成过程,充分发挥计量对测量仪器研制生产过程中各项技术活动的评价和保证作用,提升工业企业测量仪器整体供应水平,创新产业计量跨领域协同,推动国家质量基础设施融合发展。     

Gas Sensors for Measuring the Concentration of Harmful Substances: Application Features

Measurement Techniques - The advantages and disadvantages of gas sensors for measuring the content of toxic substances in work zone air are reviewed. The main standards and normative documents...     

An Adapted Procedure for Calibration of the Non-digital Peak Pressure Indicators: Motor Compression Measuring Devices

This paper is written for proposing a guideline to calibrate non-digital peak pressure gages. Motor compression testers are peak pressure measuring devices. Accuracy tests were applied to the motor compression testers and the accuracy classes of the devices were found in the study. These accuracy classes were used to select calibration procedure according to Euramet’s Guidelines on the Calibration of Electromechanical Manometers and Euramet’s procedure was adapted to calibration of non-digital peak pressure measuring devices. About seventy devices were tested in this study to find their accuracy classes. Measurement uncertainty budgets and the adapted procedure were given in this study.     

Procedure for Measuring (Determining) the Quantity of Energy Carriers When Distributing the Imbalance Between Suppliers and Consumers

A classification is given of supplier–consumer systems which occur in practice. The problem is formulated of determining the quantity of energy carriers used in accounting operations and the distribution of the imbalance. A procedure is proposed for solving the problem.     

反射式横向位移光纤传感器特性

在实验测量的基础上形成了一种在高斯光束几何反射模型下的一维数值计算方法,可以在计算机上对反射式横向位移光纤传感器的特性进行计算分析,为该传感器的优化设计提供了一个必要工具.对用62.5/125多模光纤组成的并列反射式横向位移光纤传感器的计算分析结果表明:接收光纤端面处的反射光斑半径在180 μm附近时有最大的接收光强和最佳信噪比;反射光斑半径在180 μm～600 μm时接收光强对反射条边缘的横向位移或横向振动的动态范围、线性关系和信噪比都较佳;接收光强对反射条横向位移的分布宽度主要取决于反射条的宽度和接收光纤的芯径.