摘要众所周知海洋对沿海国家的经济、社会发展状况以及国土的安全都特别重要的意义。而海水温盐深测量技术就是对海洋研究的关键技术之一，温盐深测量技术即CTD测量技术，其主要是对海水的温度(Temperature)、盐度（即电导率）(Conductivity)和深度(Depth)进行测量。由这三个参数就能够基本掌握水质和海洋气候等的变化。到目前为止，对海洋海水的温盐深三个数据的测量方法有很多，本文中的CTD传感器设计意旨用于海边CTD传感器海洋观测站。39757
考虑到CTD传感器在海洋研究与开发中至关重要，所以本文在分析 CTD 传感器发展近况的基础上，设计了一款精度较高的 CTD 传感器。本文选用的单片机型号是MSP430低功耗单片机，再配合AD7791其实高精度的24 位 A/D 转换器 ，并实现了各个模块的软、硬件模块设计，通过MSP430单片机来实现了 CTD 传感器各参数的采集；还详细阐述了用热敏电阻来测量海水的温度、用电导率传感器来测量海水的盐度和用压力传感器来测量海水的深度的原理。本文是采用RS232总线来进行上位机与传感器之间的通信，而且本文也完成了对CTD传感器的标定工作,保证系统运行安全、精确、可靠，可以基本实现对近海海域的情况实行长期有效的监测。
毕业论文关键词： MSP430 CTD传感器 AD7791
Abstract
As we all know ocean has very important significance for the coastal state’s economic and social development and national security. Seawater’s temperature, salinity and deep measurement technology is one of the key technologies about the research of ocean, that is CTD measurement technology, which measures seawater’s conductivity, temperature and depth. We can grasp the changes in water quality and marine climate change through these three parameters. At present, there are many measurement methods of the seawater’s temperature,salinity and depth. The design of the CTD sensor is used for offshore observation which is the station observation method of the sea .
Considering the CTD measurement technology is very important in the research and development of the ocean, so the design of CTD measurement circuit system has high precision at the base of the rational analysis of the actuality of CTD measurement technology. The monolithic integrated circuit model of the design is MSP430 which is low-power microcontroller, coupled with high precision 24 bit A/D converter AD7791.Then i complete the design and debugging of hardware circuit modules and function modules, using MSP430 microcontrloller to achieve the parameters of seawater. I also discusses in detail by the thermistor to measure the temperature of the seawater, the electromagnetic inductive conductivity sensor to measure seawater’s conductivity and the pressure sensor to measure the depth of the sea. This paper is based on RS232 bus for communication between computer and sensor, and this paper also complete the calibration of CTD sensor to ensure the safety of system operation, reliable and accurate. We can achieve the basic situation of coastal area to implement effective long-term monitoring .
Key word： MSP430 CTD Sensor AD7791
目 录
摘 要 I
Abstract II
1 绪论 1
1.1 课题研究的背景和意义 1
1.2 国内外研究现状 1
1.3 本论文的研究内容与结构 2
2 系统方案的设计 4
2.1 系统的性能指标 4
2.2 系统总体方案设计 4
2.2.1 系统工作原理与硬件结构 4
2.2.2 系统软件功能的细分 6
2.2.3 传感器类型的选择 6 MSP430单片机CTD传感器的设计:http://www.youerw.com/zidonghua/lunwen_40418.html