文档介绍：
电容式微差压智能变送器的设计实现
董燕婷1,2*
(1. 上海交通大学微电子学院,上海 200030;
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2. 上海自动化仪表股份有限公司技术中心,上海 200072)
摘要: 本论文针对工业应用领域中的微小压力测量,采用低功耗硬件技术,以
MSP430F5438 为主控芯片,基于 HART 通信协议,采用软件方法解决了传感器的零点漂
移、温度漂移、传感器在量程范围内的线性及非线性补偿,设计并实现了一种以电容式压
力传感器为基础的微差压智能变送器,将压力测量范围缩小到 0~ 1kPa,测量误差≤±
~%()。试验结果表明,这种设计方法是可行有效的。
关键词:微差压变送器;通信协议;温度补偿
中图分类号:TP23
The Design of Differential Pressure Transmitters Based on
Small Range
Dong Yanting1,2
(1. Shanghai Jiaotong University,Shanghai 200072;
2. Shanghai Automatic pany,Shanghai 200072)
Abstract: This thesis focuses on industrial applications of pressure measurement, the use of
low-power hardware technology to MSP430F5438 as the main chip, based on HART
communication protocol using software methods to solve the sensor zero drift, temperature drift,
within the range of the sensor linear and non-pensation, designed and implemented a
kind of capacitive pressure sensor-based smart differential pressure transmitter, pressure
measuring range will be reduced to 0 ~ 1kPa, measurement error ≤± ~ % (FS). The
results show that the design is feasible and effective.
Key words: transmitter; communication; pensation
0 引言
压力测量工业中最基本的测量量之一。随着工业水平的发展,新的制造技术,材料技术,
微电子技术,信息技术的压力传感器技术突飞猛进,压力传感器由最原始的弹簧管式、膜片
式、隔膜式表发展到电阻应变式、电容式、压电式、扩散硅压阻式等。根据不同特性的传感
器,发展成了各种压力变送器。同时按照不同被测压力源,压力变送器又可分为绝对压力变
送器,高静压变送器,低、中、高差压变送器, 微差压变送器等[1]。在