液位检测光纤传感器系统设计
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摘要
系统采用双膜盒作为水压的敏感元件,将光纤位移传感器用于检测膜盒随水压变化引起的形变.系统的信号处理电路包括光信号前置放大电路、带通滤波电路、真有效值转换电路,采用16位超低功耗的混合信号处理器MSP430作为数据处理模块.实验结果表明:系统可以测量0～181.0mm的水面液位变化,分辨率为0.7mm.增加膜盒的数量可以提高系统的分辨率.
By taking a twin diaphragm box as the sensing component for underwater pressure,a micrometric optical fiber displacement sensor was employed to inspect deformation of diaphragm box with water pressure changing. The signal processing circuit mainly includes signal pre-amplifier,BPF,RMS converting circuit,and 16 Bit MSP430 with ultralow-power consumption. The experimental results indicate that the change of water level from soutis 0 mm to 181 mm can be detected with the resolution of 0. 7 mm. The resolution can be improved by increasing the amount of the diaphragm boxes.
By taking a twin diaphragm box as the sensing component for underwater pressure,a micrometric optical fiber displacement sensor was employed to inspect deformation of diaphragm box with water pressure changing. The signal processing circuit mainly includes signal pre-amplifier,BPF,RMS converting circuit,and 16 Bit MSP430 with ultralow-power consumption. The experimental results indicate that the change of water level from soutis 0 mm to 181 mm can be detected with the resolution of 0. 7 mm. The resolution can be improved by increasing the amount of the diaphragm boxes.
引文
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[4]肖韶荣,朱平,贲富来.光纤气压传感器特性分析[J].光学精密工程,2008,16(6):1042-1047XIAO Shaorong,ZHU Ping,BEN Fulai.Analysis on characteristics of optical fiber sensor for atmospheric pressure[J].Optics and Precision Engineering,2008,16(6):1042-1047
[5]刘澄.半导体激光器稳功率脉冲电源设计[J].半导体光电,2004,25(3):235-237LIU Cheng.Design of stable pulse source for semiconductor lasers[J].Semiconductor Optoelectronics,2004,25(3):235-237
[6]安毓英,曾晓东.光电探测原理[M].西安:西安电子科技大学出版社,2004AN Yuying,ZENG Xiaodong.Theory of photoelectric detection[M].Xi'an:Xidian University Press,2004
[7]邱关源.现代电路理论[M].北京:高等教育出版社,2001QIU Guanyuan.Modern circuit theory[M].Beijing:Higher Edu-cation Press,2001
[8]刘春生.真有效值AC/DC转换器AD736及其在RMS仪表电路中的应用[J].国外电子元器件,2001(9):66-68LIU Chunsheng.Principle and application of true effective value AC/DC converter AD736[J].International Electronic Elements,2001(9):66-68
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