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布里渊时域分析技术(brilliouin optical time domain analyzer,BOTDA)是近年来在国际上研发成功的一种分布式光电传感技术,该技术已开始广泛应用于结构体和工业设备等的温度、应变检测。而新一代分布式应变测量技术——脉冲预泵浦-布里渊时域分析(pulse-prepump-brilliouin optical time domain analyzer,PPP-BOTDA),实现了10 cm的空间分辨率和±7.5με的应变测量精度。文中重点介绍了PPP-BOTDA工作原理以及技术验证,并在国内首次将PPP-BOTDA技术应用于管桩桩身应变测量,与同时进行的滑动测微计实测数据进行对比,结果表明PPP-BOTDA可作为一种新型的桩基测试技术加以推广。
Brillouin time domain analysis (brilliouin optical time domain analyzer, BOTDA) is a distributed optical sensing technology developed successfully in recent years. This technology has been widely used in structures and industrial equipment, such as temperature, Strain detection. The new generation of distributed strain measurement technique, pulse-prepump-brilliouin optical time domain analyzer (PPP-BOTDA), achieves spatial resolution of 10 cm and ± 7.5 με Strain measurement accuracy. The paper mainly introduces the working principle and technical verification of PPP-BOTDA, and for the first time, the PPP-BOTDA technology is applied to the pile body strain measurement of pipe pile. Compared with the measured data of sliding micrometer at the same time, the results show that PPP- As a new type of pile-based testing technology to be promoted.