摘要
物质的质量与水分含量是实验室分析测试的主要参数,其准确、快速测定具有重要意义。针对干燥失重法水分测定仪需要实时处理大量信息的特点,设计了基于DSP、融电子天平功能与水分测定功能为一体的新型水分测定仪,介绍了仪器的工作原理,给出了软、硬件电路设计以及系统逻辑电路的CPLD实现。为实现微型干燥箱温度的快速、超调量小的精确控制,构建了一种将分段判决、模糊控制和PID控制有机结合的复合智能温度控制方法。这种新型仪器将电子天平与红外干燥箱融为一体,具有水分测定与质量称量2种计量功能,简化了水分测量操作,并可用于试料失水、吸水和化学反应速度等动态参数监测。实验表明仪器操作简单,测定速度快,结果准确可靠。
Mass and moisture content are primary parameters of analysis and measurement, and it is important to measure them quickly and accurately. To the question of the mass real-time information has to be processed by the moisture analyzer based on the principle of loss on drying, this paper proposed a new moisture analyzer based on DSP, introduced the principle of the instrument, presented the hardware and software design of the instrument and the logical interface circuit with CPLD. In order to control the temperature of drying oven precisely and quickly, the paper developed a complex intelligent method of temperature control, which was intergraded stage adjudging with fuzzy control and PID control. The new moisture analyzer combined electronic balance and infrared drying oven that enabled the instrument to measure moisture content and weigh the mass, thus simplified the process of measuring moisture content. The instrument can be applied to observe the process of desiccation, moisture absorption and the chemical reaction of the sample. Experiments show that the instrument has high measuring speed, reliable result and convenient operation.
出处
《仪表技术与传感器》
CSCD
北大核心
2008年第11期36-38,44,共4页
Instrument Technique and Sensor
基金
宁夏大学青年启动资助项目(QN200705)
关键词
水分测定仪
DSP
复合智能控制
仪器设计
moisture analyzer
DSP
complex intelligent control
design of instrument
