眼科光学仪器注视系统研制

文档编号:ZD639    文档字数:47305,页数:108

摘要

 本课题探讨了基于OCT设备内注视系统的注视系统开发，其关键技术可用于其他眼科设备。光学相干断层成像（OCT)是近年来发展较快的一种新型成像技术，能对生物组织内部的微观结构进行高分辨率的断层成像，具有快速、非侵入及高分辨率等特点，在眼科检查中有着广泛的应用。由于具有高分辨率的特点，OCT单次成像扫描范围非常有限。为了使检查能够覆盖整个眼底，商用OCT中往往引入一个由LED点阵或LED显示屏构成的注视系统，通过改变视标的位置，引导眼球的定位。
 本文提出了一种基于有机发光二极管（OLED）显示屏的注视系统开发方案。设计从上位PC机用户操作开始，到显示屏的最终显示为止，详细给出了电路的设计方案与PC端和8051端软件流程。硬件方面，采用OSRAM公司生产的OLED显示屏参考设计套件, 包括电压转换电路模块、8051主控电路模块、OLED显示驱动模块和RS-232通信模块等。软件方面，PC端程序根据眼科检查的实际要求，采用Delphi开发平台进行界面设计；8051端程序根据PC端发送的控制数据执行用户操作。上位机与下位机之间使用RS-232标准实现控制数据的传送和实时控制。
 
 关键词：注视系统，上位机，下位机，串行通信，OLED

STUDY OF OPTICAL SYSTEM IN OPHTHALMOLOGY

ABSTRACT

 The development of a fixation system is discussed in this article based on the fixation system of OCT. The key technique can be used in other ophthalmic instruments. Optical coherence tomography (OCT) is a novel tomography imaging technique. It provides cross-sectional tomography image of the microstructure of biological tissue with high depth and transversal resolution. Featuring in the fast, noninvasive and high resolution imaging, OCT is widely applied in the field of ophthalmology. Due to its high resolution, the scanning range of OCT is rather limited. Thus in a commercial ophthalmic OCT, a fixation system based on LED dot matrix or LCD display is always introduced in. Along with the movement of visual target, different place of retina will be scanned and image of the whole retina is obtained.
 This article puts forward with a new scheme of fixation system based on organic light-emitting diode (OLED) Display. From the user’s operation in the upper computer to the output of the ultimate screen display, the hardware design scheme and software flow charts of both PC and 8051 are studied in detail. Hardware design is based on the OLED Reference Design Kit of OSRAM Corp., including DC/DC converter, 8051 control module, OLED driver and RS-232 communication interface. Program of PC is developed in Delphi platform, and should take the user’s need into account. User’s operation is performed by the program in 8051 according to control information from PC. Data transfer and real-time control from upper computer to lower computer is realized by RS-232 standard.
 
 Key words: fixation system, upper computer, lower computer, serial communication, OLED
 
目  录

第一章 绪论 1
1.1 眼科光学相干断层成像（OCT）技术 1
1.2 光学仪器注视系统 1
1.3 总体设计与方案比较 2
1.3.1 注视系统总体设计要求 2
1.3.2 注视系统的方案比较 2
1.4 OLED技术简介 3
1.4.1 OLED技术概述 3
1.4.2 OLED技术的原理 3
1.4.3 OLED技术的特点 4
1.5 通信的基本概念 5
1.5.1 RS-232C标准 5
1.5.2 通信参数 6
1.6 8051的开发流程 6
1.7 本章小结 7
第二章 硬件设计 8
2.1 Pictiva™ OLED显示屏开发板rd-040 8
2.1.1 rd-040的组成 8
2.1.2 rd-040控制电路总体设计 9
2.2 电压转换电路模块 9
2.3 8051主控电路模块 11
2.3.1 P89LV51RD2芯片 11
2.3.2 8051主控电路原理 12
2.4 OLED显示驱动模块 13
2.5 通信接口设计 13
2.5.1 PC机与8051的串行通信 14
2.5.2 8051与SSD0323的并行通信 14
2.6 本章小结 14
第三章 软件设计 15
3.1 总体设计 15
3.2 PC端程序设计 15
3.2.1 界面设计 15
3.2.2 控制模块 17
3.2.3 通信模块 21
3.2.4 用户界面与LabVIEW接口 23
3.3 8051端程序设计 23
3.3.1 与上位机通信模块 25
3.3.2 控制模块 27
3.3.3 与OLED通信模块 28
3.4 本章小结 30
第四章 调试过程 32
4.1 调试步骤和调试结果 32
4.2 调试结果分析 38
4.3 调试问题和解决方案 38
4.3.1 SSD0323的GDDRAM重排（Re-map）问题 38
4.3.2 MAX3232芯片的故障与排查 40
4.3.3 8051通信模块的调试 41
4.4 本章小结 42
第五章 总结展望 43
参考文献 44
附录一 PC端程序清单 45
附录二 8051端程序清单 60
谢辞 75
译文及原文 76

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