Abstract:Several measurement methods currently being used for measuring humidity including dewpoint method, electric relative humidity sensor, absorption spectroscopic method are presented and reviewed. Principle of operation and structure of instrument are also presented in detail.

Abstract:The basic principle, function of structure, measurement method and problems in application of the laser tracker measurement system are introduced in this paper.

Abstract:The design of a wireless monitoring system composed of embedded monitoring terminals,users' cell phones and a remote computer as the monitoring center is introduced.The method of application of a wireless module in embedded systems is emphatically discussed.The method of monitoring equipments in the field by using the wireless module to transmit and receive short messages is introduced;the process of establishing a link between the wireless module in the GPRS network and the fixed IP computer in the Internet and communicating each other are analyzed.The result shows that,in the area where the GSM/GPRS network is available,the system can accomplish the data acquisition on line,wireless remote data transmit and monitoring for the equipments in the field.The solution of embedded wireless remote monitoring has a prominent advantage when constructing monitoring systems in the open air,field place,mobile operation condition or wherever the network cables can not reach.

Abstract:A dynamic modeling is established in this paper for the temperature probes based on its heat transfer theory, and the modeling equations are solved by an numerical calculation method, moreover, the accurate result is analyzed.

Abstract:The distortion of the measured signal can be presented by the total harmonic distortion. The equation calculating the total harmonic distortion and the result do not coincide with the signal distortion. The measured result is small although the distortion is evident in practice. The INV time- frequency method proposed in this paper can counteract the weakness of the frequency method. A practical example is presented in this paper.

Abstract:In order to calibrate the airborne torque measurement system without disassembling and assembling it, a new method is proposed to combine the hardware and software into a standard verifying unit, which calibrate the airborne equipment with the interface unit, without tearing down the airborne equipment, the proposed method could accomplish the calibration of the airborne pressure sensor and the calibration of airborne measurement system individually and dynamically. Calibration results explain the results of calibration in field are satisfactory and the accuracy of calibration system is 0.3%.

Abstract:This paper gives the design process of 18 bits high-precise data acquisition system by an instance and discusses problems and practical solutions of the design. In this instance, the CPU is based on MCS-51 and the A/D chip adopts delta-sigma A/D module. It has many characteristics such as simple structure, low-cost, steady, good interface. The experiment results show that the precision of the data acquisition system reaches 18bit at 50Hz conversion ratio.

Abstract:A solution scheme that can inextenso verify electro-optical distance mster and the EDM system of electronic total stations inside a laboratory by establishing fictitious outdoor length standards with two plane mirrors in which the ray will be reflected repeatedly has been proposed in this paper. The difficulties that the scheme will have to solve, have been discussed and the feasibility has been demonstrated with existing technology and experience. Detailedly the extend uncertainty about measurement result of 1000 m by this method has been analysed and accurately calulated, and has got the conclusion that the scheme is feasible entirely.

Abstract:This paper introduces a approach to digital renovate roundness tester about type Talyrond 73 roundness tester based on AD598. Test results show that the instrument renovated not only keep the precision, but also realize automation,digitization,and visualization of testing process.

Abstract:The text does obstacle detection for the picked image. The process contains pretreatment, denary, lane detection and mathematical morphology in road image. At the same, simulation results are coped with MATLAB 7.0

Abstract:The diameter of ball-little-spindle and diameter high-accuracy batch measurement are difficult problem in the work. To this urgent problem, the author of this article has designed the comparative measurement device of a kind of tangent organization type, not only a better one solving the measurement problem in batches, but also the precision is high. This article has introduced the composition structure and operation principle of this set of devices especially and analysed its characteristic and advantage. At last, the measurement uncertainty has been provided.

Abstract:Based on the three-antenna method, the three-cable method has been devised to be applied to correcting for variations in cable transfer characteristic due to motion, flexure or aging. The method is to measure the cable in transmission and to infer the characteristic of the cable from a set of three pairwise measurements and get the correction factor to correct the measured data. By measuring in transmission, rather than in reflection, it overcomes the limitation imposed by cable loss on the use of the switched reflectometer.

Abstract:In this paper,the VSWR of microwave elements and its conventional measuring method is introduced.As the conventional method can't measure the VSWR of microwave elements of low VSWR well and truly,a new method of measuring,procedure,data processing and evaluation of uncertainly in measurement are described in detail.

Abstract:In this paper,the uncertainty of evaluation results of pulse width of pulse generator is described.The main error sources of pulse width measurement,including counter's repeatability,trigger level timing error,time base error,the amplifier hysteresis error,LSD displayed error,etc.are analyzed.According to these effect factors,the combined standard uncertainty and expanded uncertainty of pulse width measurement are evaluated.

Abstract:ARM CPU is a kind of advanced 32-bit embedded RISC microprocessor.According to this,an embedded hardware and driver design for a LCD system based on ARM LPC2210 and LCM(LCD module) are introduced.

Abstract:This paper discusses the design and realization of the manchester II coders and decoders for the 1553B bus interface card based on FPGA,The design is described by VHDL language and be fitted to the FPGA chips after logic synthesizing based on Synplify and timing simulation based on Modelsim.

Abstract:A design on the testing system of mass center of engines, including its software and hardware are described in detail.