【作者】 刘志江；

【导师】 杨克成；

【作者基本信息】 华中科技大学 ， 光学工程， 2011， 硕士

【摘要】 随着科学技术水平的不断提高,在科研和生产过程中为了探测和采集更高频率的目标光电信号,对光电探测器的性能和数据采集速率的要求越来越高。传统的光电探测系统由于响应率低、传输速率低和安装不便等因素已无法满足科研和生产的需要。新一代高速PIN光电二极管和USB2.0技术的出现很好的解决了上述问题。本课题研究并设计了一套基于USB2.0的高速光电转换与数据采集系统。为完成对室内白光通信信号(低频范围0-10MHz,高频范围100MHz-1GHz)的光电检测和数据采集的目的,本论文在系统设计性能指标的指引下对系统整体设计方案进行分析,通过比较对光电转换器件(S5973和BPX65)、A/D转换模块(MAX115)和USB2.0接口模块(CY7C68013-128AC)等核心器件进行选型。在具体的系统软硬件设计工作中,本课题对高速光电转换及信号处理模块进行硬件设计和仿真,对运算放大电路的噪声特性、电压转换速率等参数进行分析;完成USB2.0高速数据采集模块的硬件设计和电路板制作;利用Keil C51和GPIF Designer软件对基于USB2.0的数据采集模块固件程序进行编程和调试,结合DDK开发包和Microsoft Visual C++6.0软件编写了数据采集系统的驱动程序和用户应用程序。为验证所设计的光电转换和采集系统是否达到实际要求,本论文采用软硬件联调的方式进行系统实测。测试结果表明,本系统可完成10MHz-1.5GHz范围内的白光通信信号探测,USB2.0数据采集模块可输入1-4路±5V以内的目标信号,12位A/D转换器最高采样率为400KSPS,系统传输速率可达1MB/s-20MB/s,实现了对高频光电信号的光电转换和数据采集与传输功能,工作稳定可靠,达到了研发一套响应频率高、传输速度快、系统集成度高等特点的光电转换和数据采集系统的目的。更多还原

【Abstract】 During the science and technologies development in today’s world, to make the detection and acquisition more precise in the application of high frequency photoelectric signal detection and storage, there are higher and higher demands for the performance of photoelectric detection and data acquisition system. Traditional photoelectric detection devices can not satisfy today`s scientific research and production because of its low response rate, low transmission rate and inconvenience to install. The emergence of high-speed PIN photoelectric diode and USB2.0 technology can solve the problems above. This thesis describes a photoelectric signal detection and data acquisition system based on USB2.0.In order to accomplish the goal of indoor white light communication signal`s detection and data acquisition (low-frequency range 0-10MHz, high-frequency range 100MHz-1GHz). This thesis makes an overall design for the system to meet the performance index. After the comparison of different core devices, we make a selection of photoelectric conversion device (S5903), A/D conversion chip (MAX115) and USB2.0 interface chip (CY7C68013).In practical software design and hardware design, this thesis realized the hardware design and simulation of high-speed photoelectric conversion and signals processing modules, and then analyzed the parameters of operational amplifier such as circuit noise characteristics and voltage conversion rate; completed the hardware design and circuit board production of USB2.0 high speed data acquisition module, at last finished the data acquisition module firmware programming and debugging by Keil C51 and GPIF Designer software. Combining the DDK software developer’s kit and Microsoft Visual C++ 6.0 programming system, this thesis completed the drivers and user application programming work.To evaluate the performance of this system whether meets the index requirements, we do some practical measure and test. The result indicates that the system can accomplish the detection of 10MHz - 1.5GHz white light communication signal, USB2.0 data acquisition module can be input 1-4 channels target signal range - 5V to + 5V. The 12-bits high-speed A/D conversion chip MAX115 has the highest sample rate of 400KSPS. In Experiment the transmission rate can reach 1MB/s - 20 MB/s. This system can realize real time photoelectric conversion and data acquisition of high frequency instantaneous photoelectric signals, and it works steadily and reliably. So this thesis achieves the goal of developing a high-speed photoelectric signal conversion and data acquisition system, which has new characters of high corresponding frequency, high transmission speed and high system integration.更多还原