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The real-time monitoring of strain processes that can simultaneously realize a wide range and high spatial resolution has always been a huge challenge and cannot be satisfied by traditional electrical and non-contact measurement methods. In this article, the OFDR collocated with weak reflection FBG sensor (WRFBGs) was proposed to actively carry out multiple experiments on the non-standard reinforcement samples with complex strain processes in order to overcome this challenge. According to the result analysis, the complex strain variation law of the surface of the sample and the large span strain of adjacent locations during the whole process of tensile can be obtained by this method. The yield point (YP) can be accurately captured and positioned with mm-level horizontal precision. At the same time, real-timemonitoring can be realized for the step process when the strain ofthe point increases to more than 25000&#x03BC;&#x03B5; instantly. The methodcan also realize the strain detection capability with a responsespeed of 38 Hz and a 1.28 mm high spatial resolution withmonitoring the real-time high-density and large straindistribution.

ieee transactions on instrumentation and measurement

Real-time monitoring of strain processes with large range and high spatial resolution using the method of weak reflection FBG measurement based on OFDR