摘要
提出了一种新的利用光栅尺解调一组光纤光栅布喇格波长移动的系统。当光纤光栅所受的应力或温度发生变化时,光纤光栅的布喇格波长会变化(移动)。本系统利用一组光纤光栅作为敏感元件置于被测场中;利用另一组光纤光栅作为跟踪元件,跟踪从作为敏感元件的光纤光栅反射回来的布喇格波长的移动。当作为跟踪元件的光纤光栅的布喇格波长与作为测量元件的光纤光栅的布喇格波长对准时,探测器探测到最大的光强,此时,记下光栅尺的输出作为系统的测量结果。采用数字化的方法确定反射回来的布喇格波长的峰值点,从而提高系统的测量精度,使系统的测量线性大于0.999。并利用一个测量分辨率为0.01μm的光栅尺读出系统的测量结果,使本系统对光纤光栅布喇格波长移动的测量分辨率小于1μ应变量。
A novel system to demodulate the Bragg wavelength shift of an array of in-fiber Bragg gratings （FBG） with a grating ruler is proposed. When the strain and temperature of FBG vary, the Bragg wavelength of FBG will shift. The system uses an array of in-fiber Bragg grating as sensing elements which are placed in the measured environment, and employs the another array of in-fiber Bragg gratings as tracking filters to track the shift of the reflected wavelengths of in-fiber Bragg gratings The peaks of Bragg wavelengths are located by digitizing method. A grating ruler which has the measurement resolution of 0.01μm is applied to read out the output of the system. The resolution of the system to measure the Bragg wavelength shift is better than 1μstrain.
出处
《光电工程》
EI
CAS
CSCD
北大核心
2005年第12期75-77,81,共4页
Opto-Electronic Engineering
基金
北京交通大学校基金资助项目(2004SM050)
关键词
光纤光栅
光纤传感
应力测量
温度测量
Fiber Bragg grating
Optical fiber sensors
Strain measurement
Temperature measurement
