柴油机振动测试仪的硬件设计

首先分析了柴油机振动信号数据采样的特点,介绍了一种用单片微机电路设计的高速数据采集器,包括数据采集器的功能、采集板的结构、控制逻辑.它具有8路同步采样、采样频率可调、内外触发方式可选,并且根据柴油机振动信号的采样特点,有2路外部触发信号输入端口,以便判别柴油机的有效上止点.介绍了该仪器与计算机上位机的通信命令格式以及通信程序的设计.     

一种高采样率电力故障录波器的设计

针对现有故障录波器采样频率低的缺点,本文设计了一种高采样率的电力系统故障录波器,该录波器由高速数据采集卡和上位机组成。首先基于DSP芯片和两片8位并行高速A/D转换芯片TLC5510设计了一种双通道高速数据采集卡,该高速数据采用卡通过USB口将采集到的故障数据上传到上位机,上位机软件实现故障数据读取、存储和显示的功能。实验表明,该录波器采样频率可达20Msps,具有一定的实际应用价值。     

基于CPLD与单片机的多路高精度数据采集系统设计

结合CPLD与单片机设计了一种多路高精度数据采集系统，最高可达24位转换精度。所采集数据具备良好的实时性，可采集通道数目多，同时系统具备较强的抗外界干扰能力，结构简单，可靠性好。该系统具有较强的可移植性，能够广泛应用于多路、高精度、低频数据采集的场合。     

USB多路数据采集器

针对目前大多数采集系统无法实现多通道高分辨率采样及携带不方便等情况,提出了一种基于USB的多路数据采集系统的设计方法。系统利用ARM+FPGA+AD7656的系统组合实现16路通道同步信号采样,FPGA用于实现对A/D转换的逻辑控制,通过ARM7处理器对A/D转换数据进行处理,再由USB接口与计算机进行数据通信。测试结果表明,基于FPGA与ARM的多通道数据采集系统结构简单、控制方便、设计成本较低,能够准确快速地对16路信号同时进行采集。     

高速并联ADC芯片采集系统设计

介绍了一种基于并联ADC芯片结构方式,实现了一种通用的、用相对较低速的ADC器件实现较高采样频率的数据采集系统的设计方法.所设计的系统以FPGA为核心器件,通过采用并联的两片AD9254模拟转换芯片作为一个数据采集通道,利用时钟芯片AD9516-3进行时钟时序分配,控制两片AD9254芯片轮询采样.实验结果验证了用两片150 MHz采样频率的ADC器件并联工作,能够使数据采集系统达到300MHz的采样频率,并能准确测试72 MHz的输入信号.     

高炉上料监测系统的远程数据无线传送技术

针对在高温环境下对冶炼高炉上料数据实施监控的用户要求,开发了一种基于无线数传模块的远端数据采集传送装置.现场数据采集后通过无线数传模块与上位机进行通信,上位机接收数据并监控工作状况,历史数据可以具备存储、查询、报表等功能.经过实际运行测试,说明利用无线数传模块可以进行冶炼高炉特殊环境下计量测试、数据通讯及远端控制,尤其适用于下位机组成基于现场总线的监控网络,而上位机移动或多点上位机的使用场合.     

基于单片机的数据采集系统研究

本文针对普通测试仪表只能进行单参数测量的缺陷,特设计了一套综合数据采集系统通用平台.该平台建立了以51单片机为控制核心的多通道硬件系统,结合LabVIEW完成了上位机数据处理人机界面的设计,实现了数据采集、液晶显示和上位机数据处理等功能,只需更换该系统平台前端的传感器和前置放大就可以检测单参数和多参数物理量,方便用户根...     

基于8051F020的数据采集分析系统

针对当前国内应用于机械故障诊断的数据采集分析仪器成本高、实时性差等缺陷,设计了-套实时数据采集分析系统.能进行实时数据采集处理、下位机存储和上位机分析.系统整体采用主从结构;下位机采用8051F020单片机作为MCU,数据采用FRAM(铁电存储器)存储,通讯层主要由UART模块组成,实现数据采集、处理、存储及传输等;上位机软件采用vC++和MATLAB融合技术,主要实现路径设置、数据实时显示、数据处理等功能;同时介绍了在VC++中调用MATLAB引擎实现接口通信的方法.应用实例表明:系统具有很好的实时性和可靠性.     

数据采集系统输入信号多参数检测仪

本文根据固体火箭发动机试验数据采集系统检测特点,在分析国内外数据采集系统的设计组成现状后,研制新型的数据采集系统输入信号多参数检测仪。该检测仪的作用是:输入信号检测;点火系统性能检测;手控同步检测;数据采集系统输入信号过压保护及接口功能;发动机点火同步控制功能;该检测仪适用于固体火箭发动机试验数据采集系统中,是数据采集系统的最佳配套仪器,是个多功能式检测控制仪器。 本文介绍了该仪器的设计原理,工作原理,应用及分析,技术指标。为正确的设计数据采集系统和选择配套仪器提供了参考依据;对于设计数据采集输入接口控制电路提供了参考作用。     

高速无菌牛奶砖包机上下位机通讯设计

为了解决高速无菌牛奶砖包机在设计中出现的通讯问题,并考虑对操作员操作及对砖包机维护的需要,使用工控机作为上位机,采用GE90系列PLC作为下位机,上位机对PLC内部底层通讯协议SNP进行封装,使用多寄存器寻址方式,实现了在一个采样周期内完成对一台下位机的多类型寄存器的数据采集,阐述了实现高速数据采集实现原理,并结合寄存器修改方式,实现了上位机对下位机PLC输入端口的“虚拟输入”,在此基础上,编写了上位机对下位机的监视及控制程序,并建立了基于网络的远程故障诊断及维护系统。     

CAMAC-a high-performance data acquisition standard

The primary factors that affect the performance of data-acquisition systems are front-end resolution, I/O (input/output) throughout, CPU processing power, and disk storage performance. Computer automated measurement and control (CAMAC) provides a solution for these data acquisition system requirements. CAMAC-based systems are built to a nonproprietary specification conforming to ANSI/IEEE Standard 583. I/O subsystems built to the CAMAC standards which provide solutions for meeting these requirements are described. These systems can be distributed by a fiber-optic highway with 3 km/node and an aggregate throughput of up to 3 MB/s to the host computer     

Fast and High-Resolution Optical Inspection System for In-Line Detection and Labeling of Surface Defects

Automated optical inspection systems installed in production lines help ensure high throughput by speeding up inspection of defects that are otherwise difficult to detect using the naked eye. However, depending on the size and surface properties of the products such as micro-cracks on touchscreen panels glass cover, the detection speed and accuracy are limited by the imaging module and lighting technique. Therefore the current inspection methods are still delegated to a few qualified personnel whose limited capacity has been a huge tradeoff for high volume production. In this study, an automated optical technology for in-line surface defect inspection is developed offering high performance in spatial resolution and detection speed for any surface. The inspection system consisting of an LED array which illuminates a wide inspection area on the test object captures scattered light from surface defects using a 12288-pixel line CCD at 12 kHz acquisition rate. A 3.5 \(\mu\) m per pixel resolution of the line CCD provides a detection width capability of at most 43 mm which is equivalent to 147 megapixels image data acquired per second. To handle the large volume of data per acquisition cycle, the data are transmitted from a host CPU to multiple GPU devices where CUDA-based image processing kernels are adopted to perform detection and labeling of surface defects in parallel. The processed data is sent back to the CPU to display user-defined defect maps. 2-D inspection of back-coated flat mirrors, 43 mm x 70 mm\(^{2}\) in size, using a single CCD module and multiple GPU reveals that surface flaws such as bubbles, cracks, and edge defects are detected accurately. The acquisition time to capture and load the data to a CPU is 1.7 s while the processing time to transmit the same data for surface defect detection in a GPU is 248 ms. The latter time scale is considerably faster compared to minute-long computations in solely CPU-based processing algorithm of the same test object. The minimum width of detected surface defects is about 10 \(\mu \)m with true detection rates above 94%. Moreover, the inspection system is easily configurable by tasking multiple CCD imaging modules to different GPU devices to allow inspection of larger test objects. This flexibility can improve both acquisition and detection speeds to boost in-line circuit chips, packaging, and touchscreen panel inspection systems.     

单片机的数据采集实验板设计

设计的电压数据采集系统是以单片机(STC89C52)为控制核心的系统.该系统具有电路简单、功耗低、可靠性高等优点,能实现对多路模拟通道信号的数据采集与处理.并且通过ADC0809模数转换芯片把采集的电压信号转换为数字信号,再经单片机简单处理,实现将采集的数据送LED显示器进行直观显示的功能.本设计采用Keil C51语言软件编程,利用单片机内部资源简化了整个硬件电路及软件的设计,模块化处理又使得电路设计清晰合理,体积小,功效性较强.     

Performance and scalability of Fourier domain optical coherence tomography acceleration using graphics processing units

Fourier domain optical coherence tomography (FD-OCT) provides faster line rates, better resolution, and higher sensitivity for noninvasive, in vivo biomedical imaging compared to traditional time domain OCT (TD-OCT). However, because the signal processing for FD-OCT is computationally intensive, real-time FD-OCT applications demand powerful computing platforms to deliver acceptable performance. Graphics processing units (GPUs) have been used as coprocessors to accelerate FD-OCT by leveraging their relatively simple programming model to exploit thread-level parallelism. Unfortunately, GPUs do not "share" memory with their host processors, requiring additional data transfers between the GPU and CPU. In this paper, we implement a complete FD-OCT accelerator on a consumer grade GPU/CPU platform. Our data acquisition system uses spectrometer-based detection and a dual-arm interferometer topology with numerical dispersion compensation for retinal imaging. We demonstrate that the maximum line rate is dictated by the memory transfer time and not the processing time due to the GPU platform's memory model. Finally, we discuss how the performance trends of GPU-based accelerators compare to the expected future requirements of FD-OCT data rates.     

千兆网高清双波段视频采集系统

为了实现对远距离目标的实时监控,并全面清晰的捕获目标细节特征,设计了以千兆以太网为数据传输通路,通过FPGA进行采集分辨力切换,同时具有可见及近红外波段独立自动对焦功能的双波段高清视频采集系统。根据监控模式要求,系统将可见光、近红外探测器采集的视频数据,通过FPGA设置为指定分辨力的视频信号,通过千兆网将图像数据传入控制计算机,并由控制计算机进行图像显示与存储、自动对焦等操作。实验表明:系统能够根据监控要求,灵活的进行视频采集分辨力的切换及两路视频的自动对焦,最终实现了在两个波段下通过千兆网对远程目标视频的实时显示和高清存储。     

风扇试验台数据采集与处理系统

该系统为分布式测试系统,由二台前端数据采集与予处理机和一台中心数据处理机构成。具有低速、高速两种数据采集能力。每台前端机具有三十二路模拟信号来集、予处理、远程显示和数据通信功能,数据处理机主要完成前端机的初始化、数据通信、测试数据的实时处理和事后处理等任务。高速采集由高速A/D转换器实现,本系统可实现40kW/s的高速采集与测试数据的连续存盘。     

虚拟仪器在供热系统数据采集及处理中的应用

以供热生产环节为重点,基于虚拟仪器技术,研究设计了供热先进过程控制中的数据采集与信号处理系统,该系统可以完成信号采集、数据处理、存储以及图形显示等功能,具有实时性好、数据处理能力强和易于功能扩展等特点.     

Development of a Digital Signal Readout System for Large TES Arrays

We are developing a digital signal readout system for arrays of high-resolution gamma and fast-neutron detectors based on superconducting transition edge sensors (TESs). The readout system allows for real time data acquisition and analysis at count rates exceeding 100 Hz for pulses with several ∼ms decay times with minimal loss of energy resolution compared to optimum filtering. This digital signal processing system had originally been developed for gamma-ray analysis with HPGe detectors, and we have modified the hardware and firmware to accommodate the slower TES signals. Parameters of the filtering algorithm have been optimized to maximize either resolution or throughput. Here we present a summary of the digital signal processing hardware and discuss its initial performance.      

基于STM32的金属管道弱磁信号采集系统设计

针对现有金属管道弱磁信号采集方法的数据处理烦琐问题,基于弱磁信号检测技术,利用HMC1001、HMC1002磁阻传感器和STM32F407芯片,搭建了一套集数据采集、数据处理和数据分析于一体的弱磁信号采集系统。首先,介绍了弱磁信号的采集和传输过程;然后,对弱磁信号采集系统的硬件进行了设计,并引入滤波算法和压缩算法,编写了相应的数据处理与分析程序。通过设计的硬件电路和数据处理与分析程序,实现了金属管道弱磁信号的采集、传输、滤波、压缩、存储和实时显示等功能。现场验证结果符合所设计的弱磁信号采集系统的预期,表明该系统具有实用价值。