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建立了测量光纤复合架空相线(OPPC)线芯温度的分布式布里渊散射光纤传感系统。针对OPPC以及50km的光纤测量距离,在人工覆冰室和室外分别进行了温度精度测量和温度分布测量试验,利用卷扬机给OPPC增加拉力,进行了OPPC线芯应力和表面应力分布测量试验,测量了布里渊散射频率的变化。结果证明:所建系统的温度测量精度可达2℃,布里渊散射频率与温度变化呈较好的线性关系;OPPC线芯光纤不能感知OPPC受到的拉力,此时无需对温度进行应力修正;敷设在OPPC表面的光缆可以满足工程测量OPPC应力的需求。
A distributed Brillouin scattering optical fiber sensing system was developed to measure the temperature of fiber optics overhead phase (OPPC) core. According to OPPC and 50km optical fiber distance measurement, temperature accuracy measurement and temperature distribution measurement were carried out in artificial icing chamber and outdoor respectively. The tensile force of OPPC was increased by hoist. The stress and surface stress distribution of OPPC core were measured and measured. Brillouin scattering frequency changes. The results show that the temperature measurement accuracy of the system is up to 2 ℃ and the Brillouin scattering frequency shows a good linear relationship with the temperature change. The OPPC core optical fiber can not sense the pulling force of OPPC without temperature correction. The optical cable laid on the surface of OPPC can satisfy the requirement of engineering to measure the stress of OPPC.