【作者】 杨帆；

【导师】 盛赛斌； 肖大雏；

【作者基本信息】 武汉大学 ， 控制理论与控制工程， 2005， 硕士

【摘要】 当今,所有以微处理器为基础的测控系统都需要传感器来提供作出实时决策的数据。随着系统自动化程度和复杂性的增加,对传感器的精度、可靠性和响应要求越来越高。传统的传感器功能单一、体积大,性能和工作容量已不能满足多种测试要求。为此本课题研究固态压力传感器的制造技术,通过微处理机的软件和硬件的补偿方法来提高传感器的精度,实现压力传感器的智能化,促使仪表向多功能、高精度、数字化、智能化、模块化、小型轻量化方向发展,近而得到一个较为完善和理想的测控系统,提出了一种液位变送器智能化设计方案。 本文详细阐述了液位变送器智能化的设计方案,该方案主要包括:液位变送器结构设计原理、液位变送器测量系统硬件设计、液位变送器智能化软件设计、压力传感器软件补偿技术设计。针对传感器测量的温度漂移和非线性等问题,提出了曲线拟合法来加以解决,并通过RS485收发器实现PC机与传感器测量系统之间的通信,完成数据转换、数据处理和打印等功能,使测量系统更加完善。实验结果表明:该系统具有精度高、功能强、体积小的特点,适于水库、海洋、化学等场所工作。更多还原

【Abstract】 A compensatory approach to software and hardware used by microprocessor was applied to the intelligent solid pressure transducer, which not only achieved the intelligentization of pressure sensor, but also improved the sensor’s accuracy. This will surely accelerate the development of instrument towards the direction of multifunction, high degree of accuracy, numeralization, intelligentization, modularization and miniaturization so that measurement system will be further improved.The author detailedly expatiated on the design proposal for the intelligentization of liquid-level transmitter, which mainly includes the following aspects: structural design principle, hardware design of measurement system and software design of intelligentization. We put forward a scheme that curve-fitting was applied in this system according to the temperature drift and nonlinear of sensor. Communication between personal computer and measurement system of sensor was realized by means of transceiver with the type of RS485, which could finish the data conversion, data liquid-level and printing task, with the result that the measurement system was further improved. The measuring result showed that the measurement system is characterized with high degree of accuracy, strong function and small volume and it is more adaptive to practice.更多还原