分体式差压测量装置的研制-测试计量技术及仪器专业论文.docx

摘 摘 要 I I 摘 要 在工农业生产和生活实际中，尤其是在石油化工和对气液两相流的检测领域，需要 测量竖直管段或倾斜管段差压信号的情景逐渐增多，由于传统的差压测量装置中必须通 过引压管或引压装置进行引压，从而对测量结果产生影响，本课题提出并设计了一种新 的分体式差压测量方法。 论文在对传统差压测量方法进行总结和归纳的基础上，通过在实验台上的模拟实 验，并利用测量不确定度分配理论，对比数学模型进行了分析，确定了最优测量方案。 该差压测量装置采用分体式探头，一体化电桥设计，选用动态响应快、灵敏度高的 扩散硅压力传感器探头作为检测元件， AD620 构成了信号前端放大电路，利用 MSP430F149 单片机设计了现场显示及通讯电路，选用 XTR115 构成了 4～20mA 转换电 路，液晶显示模块选用 YB1602A 构成，在热工传感器实验台上对系统的硬件进行了调试， 利用 C 语言编写了系统的软件，并进行了仿真调试。通过软件设计使测量系统实现了 校零、压力和差压显示等各个模块功能。 最后，利用二等标准压力校验台对该装置进行了标定，实验数据分析表明，本分体 式差压信号测量装置达到了预期的设计目标，该装置利用两个 0.5﹪的探头，通过电路 设计及程序修正，是差压测量的准确度达到了 0.5﹪，优于传统的两压力相减分体差压 测量方法。 关键词 单片机 高频信号 扩散硅 垂直管道 两线制变送器 Abstract Abstract II II Abstract Measurement of differential signals on vertical or tilt pipe was needed more and more frequently in industrial and agricultural production and daily life, particularly in the testing field of petrifaction and gas-liquid phase flow, because deviation was introduced by pressure guiding pipe and drawing pressure unit in the traditional measurement on differential signals. So, we put forward a new testing method and designed a new split type measuring device method on measuring differential signal in this study. By summarying previous methods, taking simulation experiments ,using measurement uncertainty distribution theory，analyzing compared mathematical models . we made an optimal measuring plan. This device was designed in the structure of integrated bridge with remote probe. We choose diffused pressure sensor as detecting component due to its fast dynamic response and higher sensitivity , signal processing circuit was designed mainly by MSP430F149 microcontroller. When processing sensor signals, AD620 served as Front-End Amplifier circuit while XTR115 constituted 4 ~ 20mA transform circuit, YB1602A constituted LCD display circuit. we debugged the hardware on the test equipment of thermal sensor，wrote a software by C language, and simulated debugged Module Function such as zero adjustment， pressure，differential pressure display can be realized