Abstract:Based on the analysis of the fractile geometry theory, we have measured many machined workpieces with rough surface by different sampling length and data acquisition number. The experiment results show that the conventional roughness parameter Ra dependents on the sampling length. However, the fractile dimension D is an instrinsic parameter for characterizing rough surfaces, whichis indpendent of sampling length. Although it varies with the data acquisition number,the D tends to a constant value as the data acquisition number is large enough.

Abstract:This paper introduces the calibration method for dynamic signal analyzer, automatic calibrating system and the notable problems in the calibration.

Abstract:Based on introducing the flow field test system on air inlet/engine matching opration with whole size, when the forebody is installed ahead of the engine, the inlet pressure field data measured on the ground test platform are given. The distortion index has been calculated and the distortion map of the pressure field has been analyzed.

Abstract:In this paper, several phase shift methods generally used in accurate test and measurement are discussed. The minor angle circuit is superfacially analyzed mainly.

Abstract:The three methods used in ca1ibration of accelerometer(gravity fie1d method,centrifuger method and electro-simulation method) have been compared and researched. Under the condition of that there is no accurate centrifuger with large measuring span(namely large g value) internally,the method of how to solve the problems of coefficient calibration of accelerometer with 1arge measuring span has been provided.

Abstract:The bandwidth characteristic of digital storage oscillscope (DSO) and its influence on wave form test are presented in this paper. The features of digital circuit signal are simply analyzed. The selection principle of the DSO bandwidth which is used in the test of digital circuit is introduced.

Abstract:This Paper presents a nonlinear compensation approach for platinum resistance sensor,the design method and Pract1cal circuit for measuring temperature linearly with platinum resistance sensor. Through mathematical analysis,the theoretical base is founded for the mainlinear compensation method of platinum resistance sensor.

Abstract:This paper analysis the application of uncertainty of measurement and advances some preliminary conclusions.

Abstract:介绍一种既有可编辑逻辑器件的性能特点，又有现场编程门阵列的高密度和灵活性的在系统可编程逻辑器件－ｉｄｐＬＳＩ器件，并将一片ｉｓｐＬＳＩ１０１６用在任意波形发生器的设计中，用来产生存储波形数据的存储器所需的地址和控制信号，实现了对任意波形发生器的控制。实验表明，ｉｓｐＬＳＩ器件的应用大大减小了电路板的面积，缩短了调试周期，提高了系统的可靠性。

Abstract:This paper analyzes the necessity for the calibration of LDA system. Proposing a newconcept of using a known definite speed of a single particle as velocity reference, according to that an unique rotating disk for calibrating LDA system (calibrating disk ) is specially designed. It is verified experimentally that both stability of rotating speed and accuracy of linear velocity of this calibrating disk system have achieved or exceeded the desire of designing parameters. Therefore, linear velocity of calibrating disk can be considered as a reference velocity to make comparison with the velocities and evaluation measured by an LDA system or other optical anemometers.

Abstract:In this paper,EPI subminiature dynamic pressure transducer produced by ENTRAN of the US is introduced- In the period of applying transducers to the deve1opment and experiment of the full scale and axial symmetry turbulent generator,some occuring problems are discussed technically,the relative improvement measures are proposed and the installation of the pressure transducer and the disposition of the measuring system are introduced.

Abstract:The condition, significance and benefit of developing pattern evaluation work and significant effect of scientific management on pattern evaluation are discussed briefly in this paper.

Abstract:In this paper, the internal and external methods of reproducing roundness standard are introduced. Adapting which standard and reproducing method is discussed.