【作者】 程柏文；

【导师】 冯勇建；

【作者基本信息】 厦门大学 ， 测试计量技术及仪器， 2008， 硕士

【摘要】 在油气井开发过程中,温度和压力等数据是进行方案实施的重要依据,为此,本文就实现测试仪器结构的微型化,满足大容量数据快速存储和智能化接口的要求,设计了基于PIC16F877单片机为核心的微型井下智能压力温度计。井下压力温度计采用贴片式片内集成A/D转换单片机和I~2C总线的双线互控寻址技术实现了结构的微型化和大容量数据存储。利用FT245BM芯片的通信协议自动转换功能,开发了USB与并行I/O通信的智能化转换接口。经过系统软硬件开发,能够实现信号调理、数据采集与存储、USB通信、数据或曲线显示等功能。对此,本文主要开展了以下研究工作:1.井下仪器的硬件电路设计中,将PIC16F877内部集成A/D、高精度单片仪表放大器与硅压阻式传感器集成为最小结构的数据采集器;利用I~2C总线技术中器件地址的硬件接口设置,同时挂接多个存储器到总线,解决了大容量数据快速存储的问题。2.利用FT245BM芯片的串行接口引擎、FIFO控制器和USB协议引擎,设计了单片机时序控制FT245BM芯片引擎功能的硬件电路,实现了USB和并行I/O口之间数据传输协议的自动转换;开发了将虚拟串口驱动程序与主机端外接电路匹配的自动识别电路,实现了通信接口的智能化。3.编写调试了井下仪器的数据存储、A/D转换、USB通讯和时钟模块的控制软件;在上位机应用Visual C++6.0的串行通信编程控件MSComm编写了与USB接口进行通讯的显示界面程序。4.开发了硅压阻式传感器的信号放大、采集电路,匹配了单片机A/D转换所需的信号。最后,对系统进行了综合调试,实际测量结果与软件仿真结果吻合,系统运行实现了预期指标。测试系统结构紧凑,可广泛应用于井下的静压、流压和温度等的测量。系统功耗低、可靠性高,对于研究和开发井下多参数智能测试系统,特别是存储式深井测试系统的设计、开发和应用,具有一定的参考价值。更多还原

【Abstract】 Temperature and pressure data are vital to design implement program during well oil exploitation. This dissertation designs intelligent pressure thermometer which based on PIC16F877. It aims at micro testing equipment construction and satisfies mass data memory, and it can also realize intelligent joint.Under well pressure thermometer uses patch piece A/D conversion PIC and I~2C buss to control, so it realizes micro construction and mass data memory. It utilizes FT245BM’s function of converting automatically and exploits intelligent conversion joint of USB and I/O correspondence. After software exploitation, it can realize signal test , data collecting and memory, USB correspondence, data or curve displaying. Therefore, this dissertation launches following research:1. Connecting A/D, high precision instrument amplifier and silicon pressure sensor to be the smallest data collecting instrument; utilizing hardware joint of I~2C buss’s instrument address , plugging several memories to buss line, and it settles mass data memory.2. Utilizing FT245BM’s serial joint engine, FIFO controller and USB confer engine, designing PIC scheduling control hardware circuit of FT245BM, realizing automatically convert of USB and I/O, exploiting automatically identifying circuit of virtual serial port and external circuit.3. Designing control software of data memory, A/D conversion, USB correspondence and timepiece modular. Applying Visual C++6.0 serial correspondence program MSComm in upper PC to design display program of USB joint.4. Exploiting silicon pressure sensor’s function of amplifying signal, collecting circuit, matching conversion signal of PIC A/D. At last, debugging system, and actual results are the same with virtual results, the system fulfill expected targets.Construction of testing system is compact, and it can apply to test rest pressure, flowing pressure and temperature. It is economical and reliable, and it’s valuable to under well research and exploitation, especially to design and applying memory deep well system.更多还原