质心原理在光纤光栅传感波长解调中的应用

Application of Centroid Principle to Wavelength Demodulation of Fiber Grating Sensors

摘要: 在光纤光栅传感悬臂梁调谐滤波技术中,峰值法进行波长检测误差大,精度低,测量结果不稳定.针对峰值法的不足提出了一种质心原理方法.该方法利用扫描的光强分布图形的质心检测光纤光栅的波长变化,与传统的峰值法相比可使检测精度提高70倍,大大降低了波长检测误差.

Abstract: Among the tunable filter technologies of optical fiber grating sensors, the peak method is an usual way, but it has poor precision and the result is unstable. A centroid principle method was proposed, which used the detection of wavelength variation by the centroid of scanned light intensity distribution curves. Compared with the peak method, the accuracy is improved 70 times and the error of the wavelength detection decreases greatly.