Abstract:1700°C热校准风洞是一台高温、高速的稳态与动态温度校准装置.本文介绍了1700°C热校准风洞的主要性能和特点,以及为此而采取的保温与冷却相结合的结构设计、高温内壳设计和其它一些技术方法.

Abstract:The coriolis mass flowmeter is one of flowmeters,which has high precision,and its applicable range is very extensive.Through detecting the phase difference of the two vibration signals from the tube,the mass flowrate passed through the tube can be calculated.In this paper,factors,which influence the precision and the characteristic of the coriolis mass flowmeter,are analized.The improving measure of the construction design is suggested and several settling plans are given.

Abstract:Being related to verification regulations of JJG 144 92,ASTM E74 95 and ISO 376 1999,the primary technical requirements of standard dynamometers used for verifying testing machines are introduced and compared with each other in this paper.

Abstract:In this paper,the problems of the window set up,the forward receiving method by mirror and the way of side direction receiving ,when LDV is used to measure the velocity of water flow inside a circular tube,are discussed and some practical experience in the measurement is summarized.

Abstract:In the overall evaluation of data acquisition system(DAS),it is the most important aim to identify and evaluate the dynamic characteristics of DAS.Through selecting several relatively independent indexes,the dynamic characteristics of DAS has been presented overall in this paper.And then the dynamic characteristics given by methods of dynamic effective bits,transfer function,step response,and amplitude frequency and phase frequency characteristics respectively have been proposed by several special modelling methods.As a result,the overall evaluation of the dynamic characteristics of DAS has been solved.

Abstract:The improving method of the exchange system of the type HB 3000 Brinell tester and the operation program of the hardness tester after improvement are introduced.And the improvement effect is described.

Abstract:The uncertainty of measurement of a laser interferometer used in measuring gauge block is analized in this paper.The influence of factors,such as the quality of the interference signal.The refraction index of the atmosphere and the thermal expansion of materials etc,on the uncertainty of measurement are presented emphatically.

Abstract:A measuring system for cross conductivity standard disc based on Thompson Lampard theory is introduced in this paper.The conductivity range of the standard disc is approximately from 13% IACS to 100% IACS,its uncertainty of measurement is 0.08%.The uncertainty of measurement of the unknown disc is about 0.14% 0.1% IACS.

Abstract:The basic operation principle and settlement of the key technology of the verification system of the error of indication for grating type of length measuring instrument are described in this paper.This system has features of having high accuracy of measurement,good repeatability,intelligence,being simple and easy to be operated,and the user can spread the system freely.

Abstract:The composition,operation principle and designing method of the auto measuring system of electromagnetic radiation sensitivity are presented and the hardware configuration,system control and data acquisition software design are described.Among them the part of optical fibre field intensity data acquisition is presented in detail.

Abstract:This paper puts forward a question of measurance assurance method choosing,which the enterprise may be faced with under the economic market condition, and a modeling method of metrology resourses analysis correspanding to it is introduced. With the help of quantitized information , the subjectivity can be decresed and the corrective rate of decision making can be incresed .