基于高精度温度、电导率传感器的新型盐度计集成设计

发布时间：2018-06-11 14:36

  本文选题：盐度计 + 电导率传感器　； 参考：《国家海洋技术中心》2017年硕士论文

【摘要】：实验室盐度计是海水盐度测量和定标的基准仪器,为温盐深测量仪器(CTD)等海洋观测仪器提供实验室校准,在海洋观测领域占据十分重要的地位。当前,国内对盐度计有较大的需求,而高精度实验室盐度计市场长期被加拿大8400B盐度计垄断,其售价及维修成本节节攀升。德国OPS实验室盐度计也正在积极开拓国内市场。国内迫切需要一款更具竞争力的具有高精度、高稳定性和自动化测量特性的新型盐度计产品。本文旨在研发一款基于高精度温度、电导率传感器的新型盐度计,推进产品化并最终推向市场。文中深入研究了高精度温度和电导率测量的原理与实现方法,并依据盐度计的使用情景对传感器、电路及程序做了针对性的优化。本文在原有实验室盐度基础上,设计了恒温水浴结构,将控温区与测量区分隔,使用创新的算法实现半导体制冷与搅拌的联合控温,实现了环境±10℃范围、高精度、高动态响应的水浴温度控制,可直接测量任意温度的海水样品,避免其在温度预平衡过程中盐度值发生变化影响测量结果。本文完成了进样系统选型及驱动电路设计,实现冲洗、进样、排空等动作自动化操作,克服了人为操作因素的影响,最大化地提高了测量结果一致性和可信度。实验表明,盐度计每次测量消耗水量小于20ml,在室温附近时水浴控温波动度优于0.001℃,盐度测量值定标后测量精度达到0.002PSU,一周内漂移不超过0.0033PSU,满足测量精度和稳定性指标。
[Abstract]:Laboratory salinometer is a reference instrument for seawater salinity measurement and calibration. It provides laboratory calibration for ocean observation instruments such as temperature and salt depth measurement instrument CTD, and occupies a very important position in the field of ocean observation. At present, there is a great demand for salinometer in China, and the high-precision laboratory salinometer market has been monopolized by Canada 8400B salinometer for a long time. Germany OPS laboratory salinometer is also actively developing the domestic market. There is an urgent need for a more competitive salinometer with high precision, high stability and automatic measurement characteristics. The aim of this paper is to develop a new salinometer based on high precision temperature and conductivity sensor. In this paper, the principle and realization method of high precision temperature and conductivity measurement are studied, and the sensor, circuit and program are optimized according to the usage of salinometer. On the basis of the original laboratory salinity, the structure of constant temperature water bath is designed in this paper. The temperature control area is separated from the measuring area, and the combined temperature control of semiconductor refrigeration and stirring is realized by using the innovative algorithm. The range of environment 卤10 鈩，

本文编号：2005612