Abstract:The article discusses the main performance index,features and basic principles of the linear accelerometers,introduces the development situation in and abroad,and analyses the trend of development in the future.

Abstract:The theory and key technique of the pistonphone used for the microphone calibration are compendiously described in this paper.The study progress of the pistonphone used for the microphone calibration,including the design of the chamber,the measurement of the piston displacement and the compensation of the influence factors etc,are summarized with relative references as well.Furthermore,the development trend of the pistonphone is discussed.

Abstract:The flush airdata sensing system is much better than the traditional airdata system,and it depends on the pressure sensors allocated on the forebody of aircraft to derive the airdata indirectly.In this paper,at first the pressure model is showed briefly.And then an analysis is given,which is about the effect of the internal sensors geometry appearence on system performance;and the aerodynamic model of the pressure sensors has been developed,furthermore,the design criteria for the pressure sensors of FADS system has been formulated.Finally,the result of the simulation has been showed.

Abstract:The FDR(flight data recorder) records some parameters of the aeroengine.Because of the jamming,there are some abnormal data in these parameters.The data must be preconditioned so that it can be used to forecast the performance trend of the aeroengine.As a system,there must be some functional relation between the input and output of the aeroengin.This paper researches the preconditioning of the flight data with the RBF neural network and relation of the parameters.Normal data is worked out in this way.So this method is available.

Abstract:A new calibration method of the six-port measurement system is proposed.The self-calibration equation of the six-port reflectometer is derived from the six-port relative power theory.A new method of finding initial estimation needed for the iteractive method is discussed.The system equations are solved by the grads method.The simulation result shows that a matched load and four unmatched loads are needed for the self-calibration.

Abstract:This paper has put forward a proposition that the sensitive coefficient is equal to the ratio between the standard deviation of sendout and the standard deviation of input value, and we have proved it to be true by mathematic logic .

Abstract:介绍一种点式光纤半导体温度传感器的研究及其在电力设备安全监测中的应用情况.实际应用表明,所研制的传感器具有较高精度,精度为0.5℃(-20～125℃),价格低,性能稳定,具有很高的性价比.

Abstract:Based on briefly introducing all kinds of angle signals needed by testing the airborne electro-equipment,the design idea of the angle signal simulator with the SXZ digital-rotating transformer model and the realizing method of the circuit are presented in detail.

Abstract:Characteristic of strapdown inertial navigation system(SINS) and its application to guiding,navigation and control(GNC) of miniature type unmanded air vehicle(UAV) are discussed in this paper.As a complementarity,the algorithm of SINS and the SINS/GPS(Global Positoning System)integrated navigation system are analysed.The result indicates that the algorithm and the integrated system based on SINS can meet the GNC-specification of UAV and has a good prospect in this area.

Abstract:This paper firstly gives a introduction of the method for square gauge measurement and the key problem during measurement.Futhermore,this paper makes an analysis of the uncertainty measurement result.

Abstract:The unsyhydrazone content in unsymmetrical dimethylhydrazine is measured by gas chromatography according to the military standard GJB753-89.The uncertainty and reliable probability of the measurement result are also evaluated.The main factors which influence on the reliability of the determination results are found.The suggestions on how to improve the veracity and reliability of the determination result are also given.

Abstract:In this paper,using the self-developed high speed acquisition system and through the measurement and processing software,the acquisition and processing of the anglar speed fluctuation have been realized.Using the principle of the calibrating angle at regular time,the measurement of the instantaneous angler speed has been done.Through the experiment,the feasibility of this method has been proved as well.

Abstract:Using the involute expanding principle,through designing and developing the special anxiliary and with the VG-450 universal involute inspecting instrument,the inner gear tooth error has been carried out.

Abstract:The paper introduces the in-situ calibration principle and the evaluation of the uncertainty of measurement of the revolving type power-driven experiment device.

Abstract:The paper discusses the uncertainty of measurement during the tensile strength test of the copper-clad aluminum wire according to the JJF 1059-1999"Evaluation and Expression of Uncertainty in Measurement".

Abstract:In this paper,the automatic testing system of the signal generator is introduced.The component,function,principle amd realized method of the automatic system are narrated.The structure,think of design and difficult point of design of the software system are introduced as the key points.The software of the automatic testing system is based on Vidual Basic 6.0.And the software communicates with the instruments via GPIB interface.The automatic testing system can handle the data and upbuild the document voluntarily.The testing system is practical,efficient and reliable.

Abstract:This article introduces a design principle and implementation method of a high-speed digitizer based on PXI bus technology.It describes the system composition from two sides of the hardware and software.The acquisition platform is based on ultra high-speed ADC-ADC08D1500 and high performance FPGA-VIRTEX-4 SX35,and it can realize the 3Gsps real-time sample rate and 8 bit sample accuracy.The on-board DDR2 dram module can realize high-speed data real-time storage.The PCI9054 is used as interface IC for PXI bus.The DLL API mode is used in software development.That is convenient for different user's customizing.

Abstract:介绍了基于无损探伤技术的C扫描自动检测系统的工作原理和软硬件设计思路,并提供了测试方法.