High-speed Data Acquisition System Research Articles

A Design of High Speed Data Acquisition and Storage System

This article focuses on research and implementation of a kind of solid storage system that is based on NAND flash which can store the data with high speed and huge capacity. A design with quad 1.25Gsps ADC and flash storage array with 1TB is demonstrated in the paper. The design is applied widely in many fields such as radar, communication and speech recognition. The detail of hardware development is also introduced in the thesis. In addition, a method is discussed to approve the reading and writing bandwidth by parallel operations on multiple pieces of flash. By using the method, the data bandwidth is arrived 6GB/S.

Industrial high-speed wireless synchronous data acquisition system with real-time data compression

In this paper, an industrial wireless data acquisition system (WDAS) is presented. This system aims to change the inflexibility of wired system and improve the wireless transmission rate. First, the WDAS system consists of one wireless gateway and some wireless data acquisition terminals (WDAT), and IEEE 802.11n protocol is used to construct a multipoint distribution network. Then, in order to simplify the synchronous method and the data packet structure, we design a synchronous solution which adopts the console aided control method. The adaptive frequency and amplitude (AFA) compression algorithm is employed to reduce the data redundancy. Consequently, system can transmit more data by limited bandwidth. Last, some experiments of the compression algorithm are given to show the effectiveness of the AFA algorithm. By using the proposed system, distributed signals are synchronously measured and, hence, real-time analysis can be realized.

PC104 Interface Recommended for High Speed Data Acquisition Systems

The interface presented in this paper performs a synchronized sampling of all eight common-mode or differential analog inputs with a high sampling rate. This is a low cost interface, entirely controlled by the PC104 CPU. The paper is focused on design and operation aspects of the synchronized analog-to-digital conversion module. This interface is recommended for high speed data acquisition systems and finds its utility in energetic systems, for monitoring the power quality and for recording different specific transient events. Some programmable electronic modules which perform analog and digital signal acquisition in energetic systems already contain a PC104 interface with synchronized sampling of analog inputs; some experimental results are also presented in this paper.

High-Speed Data Acquisition System Based on FPGA in Missile-Borne Test System

In this paper, a high-speed data acquisition system based on FPGA is introduced, which has three different channels with one 5Msps sampling rate and 3×256Mb NAND FLASH. This system is controlled by a large scale FPGA chip from Xilinx Inc., XC3S500E-4FG320C. The collected data are first stored in nonvolatile flash on this fuse in-orbit and imported into a USB disk after down-falling. The main hardware and software design of each module are introduced in detail. Experiment results are shown in the final chapter.

Design of Data Acquisition System for a Certain Type of IR Seeker

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.

Ultrahigh speed endoscopic optical coherence tomography using micromotor imaging catheter and VCSEL technology

We developed a micromotor based miniature catheter with an outer diameter of 3.2 mm for ultrahigh speed endoscopic swept source optical coherence tomography (OCT) using a vertical cavity surface-emitting laser (VCSEL) at a 1 MHz axial scan rate. The micromotor can rotate a micro-prism at several hundred frames per second with less than 5 V drive voltage to provide fast and stable scanning, which is not sensitive to the bending of the catheter. The side-viewing probe can be pulled back to acquire a three-dimensional (3D) data set covering a large area on the specimen. The VCSEL provides a high axial scan rate to support dense sampling under high frame rate operation. Using a high speed data acquisition system, in vivo 3D-OCT imaging in the rabbit GI tract and ex vivo imaging of a human colon specimen with 8 μm axial resolution, 8 μm lateral resolution and 1.2 mm depth range in tissue at a frame rate of 400 fps was demonstrated.

PC104 Interface Recommended for High Speed Data Acquisition Systems

The interface presented in this paper is recommended for high speed data acquisition systems; it performs a synchronized sampling of all common-mode or differential analog inputs with a high sampling rate. This is a low cost interface, entirely controlled by the PC104 CPU. Programmable electronic modules that contain such PC104 interfaces can be found running in the energetic system from Romania; these dedicated equipments perform the analog and digital signal acquisition for monitoring and recording different specific transient events. Some experimental results obtained using the disturbance monitoring device PC-08/104 are also presented in this paper.

FPGA Based High Speed Data Acquisition System for Electrical Impedance Tomography

Electrical Impedance Tomography (EIT) systems are used to image tissue bio-impedance. EIT provides a number of features making it attractive for use as a medical imaging device including the ability to image fast physiological processes (>60 Hz), to meet a range of clinical imaging needs through varying electrode geometries and configurations, to impart only non-ionizing radiation to a patient, and to map the significant electrical property contrasts present between numerous benign and pathological tissues. To leverage these potential advantages for medical imaging, we developed a modular 32 channel data acquisition (DAQ) system using National Instruments' PXI chassis, along with FPGA, ADC, Signal Generator and Timing and Synchronization modules. To achieve high frame rates, signal demodulation and spectral characteristics of higher order harmonics were computed using dedicated FFT-hardware built into the FPGA module. By offloading the computing onto FPGA, we were able to achieve a reduction in throughput required between the FPGA and PC by a factor of 32:1. A custom designed analog front end (AFE) was used to interface electrodes with our system. Our system is wideband, and capable of acquiring data for input signal frequencies ranging from 100 Hz to 12 MHz. The modular design of both the hardware and software will allow this system to be flexibly configured for the particular clinical application.

Cycling Fatigue Induced on Electrochemical Energy Storage Cells as a Result of High C Pulsed Charging

A 3Ah lithium-ion battery, LiNixCoyAl1-x-yO2, has been repeatedlyrecharged at an elevated C rate in a pulsed fashion to understand theimpact this has on cell lifetime. A peak charge rate of 33C, ~100 A, isapplied in 3 s increments with 6 s of idle time between pulses. Betweenrecharges, the cell is discharged at a constant current (CC) 1C rate. Cellfatigue is determined using electrochemical impedance spectroscopy (EIS)and capacity measurements. During each elevated recharge, the cellsvoltage, current, and temperature are monitored using high speed dataacquisition systems. EIS measurements are made before and after each1C-CC discharge. A second cell of the same type is also cycled on apotentiostat using a 1C-CC, constant voltage (CV) recharge and 1C-CCdischarge. The goal is to compare the aging of the two cells in order tounderstand the differences introduced from elevated recharge rates.

Design and Implementation of The High Speed Data Acquisition System Based on DSP and USB

In some areas, such as automatic control, electric measure, spaceflight projects and so on, data acquisition technology is used widely. USB has the characteristics of easy to use, high speed and supporting to cut in or pull out on-line, it becomes a trend in data acquisition technology. To introduce the hardware and firmware design, selecting floating point DSP for microprocessor and Philip Corporation's ISP1581 as USB receiver/transfer control chip. The hardware consists of signal conditioning circuit and USB interface circuit. Based on the analysis and understanding of USB protocol,the firmware is designed by modules and layers. Thus, it has sample structures and clear levels. Different modules and layers have different functions, and the programs convenience revise. At last, to introduce the problems during the debugging are analyzed and summarized, some measures about the system improvement are proposed. Thus, combining USB and DSP is an effective solution to data acquisition with high speed as well as processing and transmitting.

Research on high speed data acquisition system for Tokamak devices based on PCI

Research on high speed data acquisition system for Tokamak devices based on PCI

Fumigation of a heavy duty common rail marine diesel engine with ethanol–water mixtures

A heavy duty common rail marine diesel engine operating with two stage injection is tested under load on a test bench with vapourised ethanol–water mixtures mixed into the inlet air at various rates. Ethanol/water mixture strengths of 93%, 72% and 45% by mass are tested. Results are presented for two engine loads at 1800rpm, with brake mean effective pressure (BMEP) 17bar and 20bar. At each test point, constant engine speed and brake torque are maintained for various rates of aqueous ethanol addition. Small increases in brake thermal efficiency are measured with moderate rates of ethanol addition at a BMEP of 20bar. Exhaust emissions of oxides of nitrogen, carbon monoxide, hydrocarbons, oxygen and carbon dioxide, and exhaust opacity are measured. CO emissions and exhaust opacity tend to increase with increased ethanol addition. NOx emissions tend to decrease with increased ethanol addition and with increased water content. Hydrocarbon emissions remain low, near the detection limit of the analyser. Cylinder pressure and the electronically controlled two stage liquid fuel injection timing are recorded with a high speed data acquisition system. Apparent heat release rate is calculated from the measured cylinder pressure. The apparent heat release rate and fuel injection timing together allow analysis of the mechanism of the combustion process with ethanol fumigation. Two stage injection involves a small pre-injection of diesel fuel to reduce early pressure rise rates in normal diesel engine combustion. Even though injection timing is retarded by the Engine Control Unit as more ethanol is added, combustion timing effectively advances due to the effect of two stage injection. Where the ethanol/air mixture strength is above the lower flammability limit at compression temperatures, the mixture is ignited by the pre-injection and begins to burn rapidly by flame propagation and/or autoignitive propagation before the main liquid fuel injection begins. This occurs for ethanol energy substitution rates greater than 30%. Two distinct peaks in heat release rate appear at the higher ethanol rates. Severe knock becomes apparent for 34% ethanol. Two stage injection may be disadvantageous in these circumstances.

High-speed Continuous Data Acquisition System Based on FPGA

High-speed Continuous Data Acquisition System Based on FPGA

Performance of Hybrid Steel Fibers Reinforced Concrete Subjected to Air Blast Loading

This paper presents the results of the experimental data and simulation on the performance of hybrid steel fiber reinforced concrete (HSFRC) and also normal reinforced concrete (NRC) subjected to air blast loading. HSFRC concrete mix consists of a combination of 70% long steel hook end fibre and also 30% of short steel hook end fibre with a volume fraction of 1.5% mix. A total of six concrete panels were subjected to air blast using plastic explosive (PE4) weighing 1 kg each at standoff distance of 0.3 meter. The parameters measured are mode of failure under static and blast loading and also peak overpressure that resulted from detonation using high speed data acquisition system. In addition to this simulation work using AUTODYN was carried out and validated using experimental data. The experimental results indicate that hybrid steel fiber reinforced concrete panel (HSFRC) possesses excellent resistance to air blast loading as compared to normal reinforced concrete (NRC) panel. The simulation results were also found to be close with experimental data. Therefore the results have been validated using experimental data.

基于LabVIEW的多通道噪声采集系统设计

本文基于NI公司PXI4497数据采集卡，利用LabVIEW研发了风洞内噪声测量试验并行数据采集及实时存储程序，完成了高速数据采集系统的实现和应用。通过试验观察，数据量的存储达到了硬盘读写速度的极限，根据试验特点提出了基于磁盘阵列的更多通道更高采样率的程序设计思想。并成功多次应用于航空工业领域的开口及闭口风洞噪声动态测量试验中，满足了预期的科研要求，为后续的噪声试验数据的处理工作打下了坚实的基础。 This paper develops a set of noise measure, data acquisition and real-time storage program used in wind tun-nel test based on PXI4497 data acquisition card and LabVIEW. High speed data acquisition system is completed. Through experimental observation, the data stored in the hard disk speeds up to the read and write limit. According to this test characteristic, a design of more channels and higher sampling rate program based on the disk array is proposed and successfully used in noise dynamic measure tests in open and close wind tunnels in aeromagnetic industrial domain. Expected scientific requirement is fulfilled. This is a solid foundation for the noise test data processing in the future.

Design of High-speed Sampling System in Pulse Laser Application

In measurement system by means of pulse laser, such as plasma measuring, laser ranging, the amplitude of echoed laser wave is very weak and difficult to detect by traditional analog electronic technology. A digital high speed data acquisition and processing system was designed to meet the accuracy requirement. It adopted high speed AD chip and advantage FPGA chip as core unit. Experiment results have verified this system can reach to 1GHz sample rate and can catch weak echo wave effectively and the measuring accuracy is improved markedly.

Development of a High-Speed Ion Signal Acquisition System for Mass Spectrometer

Due to the rapid development of manufacturing technology, high-speed high-resolution data acquisition system has been widely applied in plenty of engineering fields, such as radar, environmental surveillance, mass spectrometry, etc. In order to satisfy the increasing requirement, we present the design of a high-speed data acquisition system, which is mainly composed of high-speed time-interleaved analog-to-digital converter, high data throughput interface based on 10 gigabit Ethernet. The detailed design and realization of each module are presented. Finally we test and analysis the performance of the ion signal acquisition system, and the results show that the system performs fine speed, high precision and stability.

Research on Application of High-Speed Data Acquisition System for AC Rail Flash-Butt Welding

Data acquisition system of the flash-butt welding machine had been designed for sampling current and voltage data during welding process. Software, which could sample and analyze the welding data easily, has been developed based on LabVIEW and Visual Basic. The acquisition system could sample, store and query the welding current and voltage data, as well as display the real-time waveform of them. By analyzing welding data and waveforms, we could extract characteristic signals over all phases, including flash stability, input heat and plus-minus symmetry of current waveform. Further more, he characteristic signals’ extracting and current waveform’s analyzing, could be used to instruct the welding processing debugging and the diagnosis of equipment failures, especially the failures which was difficulty to be found with conventional methods.

Effects of bubble coalescence dynamics on heat flux distributions under bubbles

Bubble coalescence events and single bubble nucleation, growth, and departure were observed with a charge‐coupled device (CCD) camera synchronized with a high‐speed data acquisition system measuring the heat fluxes at different positions underneath the bubble. Four different kinds of coalescence events took place with characteristic heat flux signatures for each type of event. The heat transfer measurements under four typical heaters representing different positions under the bubble showed very different heat flux characteristics during each ebullition cycle. The results show that transient conduction due to the movement of the contact line during bubble interactions, sliding, stretching, and oscillating is the main mechanism resulting in the high heat transfer rates during coalescence. Fast evaporation of the liquid layer trapped between the two bubbles and higher heat fluxes near the contact line as the microlayer evaporated also generate high heat flux spikes but have less influence due to their short duration and small influence area. © 2012 American Institute of Chemical Engineers AIChE J, 59: 1735–1745, 2013

Measurement of Thin-Film Evaporation Heat Transfer for Evaporators with Sintered Powder Wick Structure

Two-phase heat transfer devices such as heat pipes and vapor chambers are composed of an evaporator, an adiabatic section and a condenser. For the dry-out prevention and capillary purpose, adiabatic sections and evaporators are covered by wick structures. Common wick structures are grooves, mesh, sintered powder and their combination. Combining with the wick structures, the major phase change effects on evaporators are thin-film evaporation. For the research between parameters of wick structure and evaporator performance, we developed a facility to measure the heat transfer on evaporators. To ensure the least heat losing, the path of heat flux and test condition were designed with several thermal guards. A pressure control system was established with balance mechanisms to maintain a stable condition of low pressure. Since temperature differences are very fast while the major phase change effect is thin-film evaporation, a high speed data acquisition system was used. Based on this test platform, the performance of evaporators can be determined at specific conditions.