Abstract:The paper generalizes the study of laser Doppler technique from the aspects which include optical system. signal proccssing and directlon distinguishing. An application of laser Doppler measurement system to the scatlerer displacement is thcn described, which imitates the grating Doppler effect by space filter.

Abstract:介绍了天平式质心仪的结构原理及其灵敏度调整方法，说明了棒形轴对称构件轴向质心的确定方法及误差分析，用这种仪器测量炮弹，小型导弹类轴对称构件的质心位置，其测量准确度优于１％。

Abstract:This paper briefly analyzes the problems of principle, practical application selection and energy conservation of several industrial flow-measuring instruments generally used in domastic energy source syslem. It provides the reference of optimizing flow-measuring instruments for user.

Abstract:This paper introduces the System International d'Unites (SI) and centimeter-gram-second system (cgs) of the dynamic viscosity, kenimatic viscosity and condition viscosity and the conversion between them.

Abstract:This paper presents the operating principle of the optical pump helium magnetomelerandthe circuit design of the resonance abasorption curve mapping system.

Abstract:This paper describes the calculation of the errors of various sensors for duct airflow temperature measurement on the basis of the problems encountered in application, and the quantitive analysis of the errors of the temperature sensors of resistor and thermocouple types. Because of the significant defects of the temperature sensors with sealed housing in practical use,it is suggested to use thermocouples for the measurement of duct airflow temperalure in aircraft environment control system (ECS). Also, this paper provides the structure of a practical temperature thermocouples and points out how to reduce the error caused by thermal conduction and radiation.

Abstract:Excel is widely applied in the vacuum metrology. This paper gives s0me examples to describe the calculation,statistic analysis, regression analysis,macro,OLR and DDE functions of Excel.

Abstract:This paper introduces a new type of novol Liquid Flowrate Calibrating Device which was developed in our country at the first time and its applied prospect.

Abstract:This paper deseribes the affact of metrology during air dynamic experiment with concrete example, and briefly presents the recognition and experience of setting and developing the metrological system.

Abstract:The method of decreasing test and measurement error during testing and measuring RF signal spectrum is introduced and several situations of return loss are analyzed in this paper.