光学学报, 2004, 24 (1): 21, 网络出版: 2006-06-12
基于波分耦合器的光纤布拉格光栅传感器
Optical Fiber Bragg Sensors Based on Ordinary WDC and LED
光纤光学 传感器技术 光纤传感器 光纤布拉格光栅 波分耦合器 波长移动 fiber optics sensor technique optical fiber sensors fiber Bragg grating (FBG) wavelength division coupler (WDC) wavelength shift
摘要
为了实现对光纤布拉格光栅传感器的波长解调,使用普通的光纤波分耦合作为波长鉴别器件,将波长的变化转变成光强的变化,并用双路差动放大去除光源强度变化和外界干扰的影响.使用发光二极管(LED)作为光源以降低系统成本,因此使用调制光源和交流放大器对信号进行处理.实验达到约10 με的应变测量分辨力和0.2 ℃的温度测量分辨力.是目前最廉价的光纤布拉格光栅传感器之一.
Abstract
A technique for detecting Bragg wavelength shift using ordinary wavelength division coupler (WDC) as wavelength discriminator is presented. The WDC is used to transform the wavelength shifts to intensity changes. Double differential amplifiers are used to get rid of interference induced by light source and surroundings. LED is used as the source to reduce the system cost,so the demodulated source and AC amplifiers are available. The strain resolution of 10 με and temperature resolution of 0.2 ℃ are achieved in the experiment. This is one of the cheapest fiber Bragg grating sensors till now.
江毅, 刘莉. 基于波分耦合器的光纤布拉格光栅传感器[J]. 光学学报, 2004, 24(1): 21. 江毅, 刘莉. Optical Fiber Bragg Sensors Based on Ordinary WDC and LED[J]. Acta Optica Sinica, 2004, 24(1): 21.
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