微电流检测装置设计(含电路原理图,PCB图,程序代码)

微电流检测装置设计(含电路原理图,PCB图,程序代码)(任务书,开题报告,论文14500字,电路原理图,PCB图,程序代码)
摘  要
微弱电流即小于10-6A的电流。近年来，随着电子测量技术的进步，对微弱电流信号进行检测的有关技术在信号处理、测量传感、临床医疗、军事跟踪、仪器仪表、电磁学等相关领域中的运用越来越广泛。微弱电流信号的检测对于新兴科技的发展研究、理论知识的探索创新都具有重要意义。
本文所设计的微电流检测装置以STM32F103C8T6单片机作为控制核心，采用高精度运算放大器LTC2051搭建I/V转换放大电路，利用芯片内提供的两个OP放大器对信号实现二级放大并送入STM32F103C8T6内部的AD采样电路中,经运算处理后将采样值还原为电流值传送到上位机进行显示。
经过测试，本文所设计的微电流检测装置测量范围为0~500μA，相对误差小于1.5%，体积为75mm x 40mm x 10mm，具有体积较小便于携带的特点，适用于医疗、生物等领域的微弱电流信号检测
关键词：弱电流检测  STM32F103C8T6  运算放大器  
 
Abstract
Weak current is current less than 10-6a.In recent years, the detection technology for weak current signals has been widely used in signal processing, measuring devices, clinical medicine, military tracking, instrumentation, electromagnetism and other related fields, greatly promoting the progress of electronic measurement technology.However, at present, the index requirements for weak current signal detection are gradually improved, and it is very important for the development and research of emerging technologies and the exploration of new theoretical knowledge to effectively detect weak signal, and it is also crucial for the rapid development of measurement instruments and other related fields.
Related detection circuit design in this paper, in order to STM32F103C8T6 single chip microcomputer as control core, through the use of high precision operation amplifier LTC2051 as amplifying circuit, realize the IV conversion, the weak current signal into a voltage signal can measure, after two stage amplifier into STM32F103C8T6 internal AD sampling circuit system, at the same time the voltage value that had been collected through STM32F103C8T6 SCM processing, and the readings will be calculated value to the upper machine.
Through testing, the microcurrent detection device mentioned in this paper can detect the microcurrent signal of 0 A~500 A.It is 75mm long and 40mm wide, so it is small in size and easy to carry. It is suitable for medical and biological fields.
Key words：Weak current detection; STM32F103C8T6; operational amplifier

目  录
摘  要    I
Abstract    II
第一章  前言    1
1.1  本课题的前景及意义    1
1.2  国内外研究情况    1
1.3  课题主要解决的问题    2
第二章  系统总体设计    3
2.1  系统硬件总体结构图    3
2.2  设计电路方案的比较    3
2.2.1 控制系统的选择与论证    3
2.2.2 放大器的选择与论证    4
2.2.3   转换器的选择与论证    6
第三章  系统硬件电路的分析    9
3.1  系统模块电路设计及原理    9
3.1.1  放大电路的设计    9
3.1.2  芯片结构    10
3.2  单片机系统设计    11
3.2.1  单片机总体设计方案    11
3.2.2  STM32F103C8T6介绍    12
3.2.3  STM32F103C8T6外围电路设计    13
3.3  A/D参考电压电路设计    14
3.4  稳压电源设计    15
3.5  上位机串口电路设计    16
3.6  PCB设计图    17
第四章  系统软件设计与调试    18
4.1  系统软件程序流程图    18
4.2  AD采集程序设计    18
4.3  上位机串口程序设计    19
4.4  调试结果与分析    20
第五章  总结与展望    22
5.1  总结    22
5.2  展望    22
参考文献    24
附录  系统程序    26
致谢    32