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光栅定位是大规模超弱光纤光栅阵列制备及铺设质量检测的关键技术之一。针对传统光时域反射仪定位超弱光栅时存在的问题,提出了一种超弱光栅阵列的相位-强度二维定位方法。该方法采用光栅时域反射技术查询阵列中的单体光栅,通过调节选择脉冲和入射脉冲之间的相位差,捕捉反射信号的光强峰值,实现对目标光栅的准确定位。构建了超弱光栅阵列的定位系统,对1009个平均反射率-34 d B、间隔2.5 m的超弱光栅阵列进行了定位实验,定位误差小于10 cm。
Grating positioning is one of the key technologies for the preparation and laying quality inspection of large-scale ultra-weak fiber grating arrays. Aiming at the existing problems of traditional OTDR in positioning ultra-weak grating, a phase-intensity two-dimensional localization method for ultra-weak grating array is proposed. The method uses grating time-domain reflectometry to query the single grating in the array and captures the peak intensity of the reflected signal by adjusting the phase difference between the selected pulse and the incident pulse to achieve accurate positioning of the target grating. The positioning system of ultra-weak grating array was constructed. The positioning experiments of 1009 ultra-weak grating arrays with average reflectance of -34 d B and interval of 2.5 m were carried out with the positioning error less than 10 cm.