便携式微小电容测试仪的设计
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摘要
为了便于测量液体火箭发动机试验台贮箱中电容式液位计的电容值,设计了一种便携式电容测量仪。该系统是一款基于MSP430F449微控制器的数字便携式测试仪表,通过利用单片机内嵌的12位高速A/D转换器,实现高精度数据采集,通过LCD12864实现电容值的显示。分别从电容检测原理、系统硬件电路设计和微控制器软件编程三个方面详细阐述了该智能测量仪器的设计原理和实现方法。该仪表具有三端测量功能,可测量带长线缆的电容式传感器的电容值。电容测量范围为10～9 999 pF,精度可达1 pF。
In order to conveniently measure the capacitance value of the capacitance level gauge in the tank of the liquid rocket engine test bench, a portable capacitance measuring instrument was designed.The system is a digital portable test instrument based on MSP430 F449 microcontroller.It realizes high-precision data acquisition by using 12-bit high-speed A/D converter embedded in the single-chip microcomputer, and displays the capacitance value through LCD12864.In this paper, the design principle and implementation method of the intelligent measuring instrument were elaborated from three aspects: capacitance detection principle, system hardware circuit design and microcontroller software programming.The instrument has a three-terminal measuring function that can measure the capacitance of a capacitive sensor with a long cable.The capacitance measurement range is from 10～9 999 pF with accuracy of 1 pF.
In order to conveniently measure the capacitance value of the capacitance level gauge in the tank of the liquid rocket engine test bench, a portable capacitance measuring instrument was designed.The system is a digital portable test instrument based on MSP430 F449 microcontroller.It realizes high-precision data acquisition by using 12-bit high-speed A/D converter embedded in the single-chip microcomputer, and displays the capacitance value through LCD12864.In this paper, the design principle and implementation method of the intelligent measuring instrument were elaborated from three aspects: capacitance detection principle, system hardware circuit design and microcontroller software programming.The instrument has a three-terminal measuring function that can measure the capacitance of a capacitive sensor with a long cable.The capacitance measurement range is from 10～9 999 pF with accuracy of 1 pF.
引文
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[2] 尹韬,杨海钢.MEMS高精度电容读出电路的单芯片集成研究[J].电子器件,2007,30(4):22-26.
[3] 邱桂苹,于晓洋,陈德运.微小电容测量电路[J].黑龙江电力,2006,28(5):362-366.
[4] 白国花.电容传感器测量电路的研究与应用[D].太原:中北大学,2005.
[5] 段文浩,张佳,王虹玥.数字式低温液位测量系统[J].火箭推进,2017,43(3):79-84.DUAN Wenhao,ZHANG Jia,WANG Hongyue.Digital measurement system for cryogenic liquid level[J].Journal of Rocket Propulsion,2017,43(3):79-84.
[6] 杨天麒.基于电容测量的液位检测技术研究[D].成都:电子科技大学,2012.
[7] [日]冈村迪夫.OP放大电路设计[M].北京:科学出版社,2004.
[8] [日]松井邦彦.OP放大器应用技巧100例[M].北京:北京东方科龙图文有限公司,2005.
[9] 张少谦,马辰,李恩全,等.一种基于DDS与单片机的自动电容测量系统设计[J].科学技术与工程,2010,10(25):21-24.
[10] 沈建华,杨艳琴.MSP430系列16位超低功耗单片机实践与系统设计[M].北京:清华大学出版社,2005.
[11] 秦龙.MSP430单片机常用模块与综合系统实例精讲[M].北京:电子工业出版社,2007.