Strain measurement based on SMS fiber structure sensor and OTDR

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This article presents a strain measurement method using a singlemode‐multimode‐singlemode fiber structure sensor and an optical time domain reflectometer. A strain measurement range of 0–1000 με can be achieved with a resolution of better than 10 με. Using this method, a quasi‐distributed strain measurement can be carried out which is useful for a bridge or a civil structure strain monitoring.