PPP-BOTDA分布式光纤传感技术及其在试桩中应用

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。

PPP-BOTDA distributed fiber optic sensing techniques and its application to pile tests

The brilliouin optical time domain analyzer (BOTDA) is a new distributed optical-electronic sensing technique successfully developed abroad. It had been widely applied to detecting temperature and strain of structures. The new distributed strain measuring technique, pulse-prepump-brilliouin optical time domain analyzer (PPP-BOTDA) method realizes the test results of 10cm spatial resolution and ±7.5 με strain measuring precision. This paper describes the basic principle and experimental results of PPP-BOTDA, And its strain measuring method has been firstly applied to the tubular pile test; at the same time, a contrast with the sliding micrometer results is done; and it is shown the PPP-BOTDA is a very potential technique for the pile test.