Enhanced laser speckle optical sensor for in situ strain sensing and structural health monitoring

Yong Pang, Bernard K. Chen, Siu Fung Yu, Siva N. Lingamanaik

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6 Citations (Scopus)


In this Letter, an enhanced laser speckle optical sensor (LSOS) for nondestructive, noncontact, and high-accuracy strain measurement has been developed. Subsystems of laser beam shaping and telecentric imaging were incorporated into the LSOS to achieve optimized speckle patterns, and a field-of-view (FOV) separation was introduced to extend sensor gauge length. Validation tests confirmed that the LSOS achieved consistent results with resistive strain gauges in laboratory conditions with maximum RMS error (RMSE) of 9.44μϵ. Sensing practicality was demonstrated in field tests. The results showed that the LSOS is capable of achieving accurate strain measurements in an external environment with maximum RMSE of 13.34 μϵ.

Original languageEnglish
Pages (from-to)2331-2334
Number of pages4
JournalOptics Letters
Issue number8
Publication statusPublished - 15 Apr 2020

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