Applied Mechanics and Materials Vols. 333-335

Abstract: The borehole-surface networked oil-water interface resistivity imager receiver which is in-depth research and designed in the thesis bases on the borehole-surface resestivity method.The text recommended a few hardware and the software constitution of module. The main function of every module is set forth in detail.These include the kind of system error and its calibration and principle calculation,the best way to weak low frequency signal conditioning,synchronization technique that the system applied.

Abstract: The beam measurement is essential for an accelerator. In the proton LINAC in China Accelerator Driven Sub-critical system (ADS), a high resolution measurement of beam position and phase is required within one single system. To meet the requirement, this beam position and phase measurement (BPPM) electronics is designed based on a direct RF under-sampling technique, which simplifies both the analog and digital processing circuits. The signals received from the LINAC are narrow pulses with a repetition frequency of 162.5 MHz and a dynamic range more than 40 dB. After analog manipulation, the input RF signals are directly converted to In-phase and Quadrature-phase (IQ) streams through under-sampling based on the high-speed high-resolution Analog-to-Digital conversion technique. All signal processing is integrated in one single FPGA, in which real-time beam position, phase and current can be obtained. A series of simulations and tests have been conducted to evaluate the performance. Initial test results indicate that this system achieves a position resolution better than 20 um and a phase resolution better than 0.1 degree over a 40 dB dynamic range with the bandwidth of 780 kHz, which is well beyond the application requirements.

Abstract: Due to the preciousness of real lunar dust, the lunar dust simulant is usually employed to replace the real one in the large numbers of experimental investigations about its mechanical property and engineering property. Therefore, the investigation on mechanical property of lunar dust simulant is also extremely significant. This research has put forward several methods for measuring mechanical property, which are used to measure the parameters including particle size distribution, particle proportion, relative density, void ratio, cohesion, internal friction angle, etc. of lunar dust simulant. The lunar dust simulant is determined to be suitable for application in the moon exploration project experiment after comparing these parameters with relevant typical mechanical parameters of foreign lunar dust simulant.

Abstract: A laser sensor based equipment was assembled for on-line measuring the fiber diameters during the polymer spinning. The analog signals come from laser sensor were detected by using a data acquisition instrument and transferred into digital ones, which were processed in time with Labview. In a typical experiment, the diameters of polypropylene fibers were tested under different spinning speed by means of that pre-calibrated on-line measurement equipment, and the testing results were compared with those obtained from the numerical simulation of spinning dynamics. It has been found the on-line diameter measurement could promise high-speed, highly reliable and flexible testing.

Abstract: Microsoft Visual C++ was used to achieve the online acquisition and display of the track parameters, based on the comprehensive online testing car platform of rail transport railway catenary and track. The communication between PC104 embedded IPC and MCU data acquisition system was accomplished through serial port and MSComm control. The static window-split method and MSChart control were both used to draw the several parameters real-time lines in different grids of a window. Using ADO to save data was also introduced. The operation result show the functions of acquiring,displaying and saving track parameters ,which are expected and required, are realized.

Abstract: The data communication system is the internal data exchange platform of theodolite, which completes data exchange among multiple subsystems. According to requirement of proving range to target attitude measurement, the rate of real time target image storage is quicker and quicker, as the synchronous measurement information deliverer, the communication frame frequency of data communication is also increasing. Adopting time pre-processing method resolves the problem that B code terminal cannot provide high frame frequency time information, The utilization of ARM processor built in watchdog counter function and configuration of external interruption signal can realize the precise time sequence control, and realize the synchronous transmission of measured data in case of high frame frequency, and the software realization method is provided.

Abstract: This article describes the design of a high-speed data acquisition system which can record 11 channels data of a certain type of IR seeker in interference tests between IR seeker and infrared decoy projectiles. This system adopts PC104 embedded computer to form a small and ruggedized data acquisition system which can be used for the ground tests data acquisition and can be installed in a certain type of flight training missile for the air tests.

Abstract: Although microbial biosensor can be used for online monitoring, its application is limited due to the data acquisition and transmissions are difficult. This paper presents a wireless high-precision microbial biosensor data acquisition system. It is constructed with CC2530 as the core chip, while NUC120, PGA280 and ADS1259 as supplemented chips. Software design uses C and LabVIEW. Because of wireless transmission, the system can availably solve wiring problem of special environment and is easy to connect to the Internet. It expands the application scope of microbial biosensor effectively, and can be widely used in all kinds of small data acquisition fields which require high-precision.

Abstract: An amplitude-discriminating type twin-channel brushless resolver decoder based on AD2S80A chip and its decoding strategy have been proposed in this paper. The decoder uses two AD2S80A chips as resolver-to-digital converter (RDC). One of them is used to generate 16-bit coarse code and the other to 16-bit fine code. Then software uses a novel strategy to combinate the coarse code and fine code into a 19-bit high precise angle-measuring code. Finally, an experiment has verified the strategy which is practical for high precise angle position sensing. //

Abstract: A high-performance vehicle multi-axis optical encoder data acquisition system based on PC104 bus is introduced. The paper puts emphases on the main function of the system module. VHDL hardware description language is used to design the modules, and ModelSim is introduced to implement logic and sequential simulation. An experiment is carried on in Altera EPF10K40 chip. Both the simulation and experimental results verify the correctness and validity of the method.