法布里-珀罗光纤位移传感器的设计.doc


法布里-珀罗光纤位移传感器的设计
吴迪,钟志**
(哈尔滨工程大学信息与通信工程学院,哈尔滨 150001)
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摘要:基于 F-P 腔的法布里-珀罗(F-P)光纤位移传感器具有很高的灵敏度,适应于小量程高
精度位移的测量。本文对 F-P 光纤位移传感系统进行了研究设计,重点阐述了锁相放大电路
在对微弱光信号解调中的设计原理与实现方法,实验结果表明设计的解调电路能够有效提高
信噪比。整个传感系统的灵敏度可达 38mV/nm,其线性范围为 135nm。
关键词:法布里-珀罗腔;光纤位移传感器;锁相放大;灵敏度
中图分类号:TN29
The design of Fabry-Perot Optical Fiber Distance Sensor
Wu Di, Zhong Zhi
(College of information munication engineering,Harbin Engineering University,Harbin
150001)
Abstract: The Fabry-Perot (F-P) optical fiber displacement sensor based on F-P cavity has a very high
sensitivity, and it is suitable for measuring small range and high precision displacement. This paper
studies the design of F-P optical fiber displacement sensor system, the phase-locked amplifying circuit
in the design principle and realization method of the weak optical signal demodulation were the main
point. The experimental results show that the demodulation circuit design can improve the SNR
effectively. The sensitivity of the sensor system was able to be , the linear range is 126nm.
Key words: Fabry-Perot cavity; Optical fiber displacement sensor; Lock-in amplifier technology;
sensitivity
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0 引言
随着物联网时代的到来,传感器的应用范围越来越广泛,而光纤传感器凭借其独有的优
点得到了十分快速的发展。光纤传感器具有较高的灵敏度和分辨力,其结构简单、性能稳定
体积小、可弯曲、耐高温,能够适应多种环境。并广泛应用于对位移、加速度、压力、声音、
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振动、温度、等各种物理量的测量[1-3]。
在众多光纤传感器当中,基于 F-P 腔的法布里-珀罗(F-P)光纤位移传感器是一个重要分
支。