摘要
根据微弯式阶跃型多模光纤传感器的基本原理,设计了一种结构简单、体积小、灵敏度高的实用光电报警系统。从理论上分析、设计了使光纤产生微弯曲的梳状变形器,并且计算出报警系统高灵敏度所需的变形器周期,约1.1mm;另外,设计了与之匹配的报警电路模块。该模块由平衡电桥、电压比较器、单态触发器和多谐振荡器组成,电压比较器根据平衡电桥的状态产生相应的电信号到单态触发器,进而通过单态触发器控制多谐振荡器,实现报警处理,适当调节平衡电桥的变阻器可以改变报警系统的敏感度。
Based on the basic principles of microbend step multimode fiber sensor,a kind of optoelectronic alarm system with simple structure,small dimension and high sensitivity for pratical applications was designed.First,the dressing deformation for optical fiber generating microband was analyzed and designed,and the period of deformation,about 1.1mm,was caculated for high sensitivity alarm system.In addition,the alarm circus module for matching with high sensitivity alarm system was designed.The alarm circus module is composed of the balance bridge,the volage comparator,the monostable trigger and the multivibrator.The electric signal in accordance with the state of balance bridge generated by voltage comparator is input the monostable trigger,and the multivibrator will work based on the output signal of monostable trigger,and then drive the speaker.The sensitivity of optoelectronic alarm system can be varied by adjusting the rheostats of the balance bridge.
出处
《半导体光电》
CAS
CSCD
北大核心
2010年第4期652-654,共3页
Semiconductor Optoelectronics
关键词
光纤传感技术
微弯式
弯曲损耗
光电报警
fiber-optic sensor technology
microbend
bend loss
optoelectronic alarm
