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Within the next few days the corresponding author will receive an email from WileyвЂ™s Author Services system which will ask them to log in and will present them with the appropriate license for completion. Your article cannot be published until the publisher has received the appropriate signed license agreement. Please note although the manuscript is accepted the files will now be checked to ensure that everything is ready for publication, and you may be contacted if final versions of files for publication are required. It is a pleasure to accept your manuscript entitled 'Multi-Camera Measurement System to Evaluate the Dynamic Response of Utility-Scale Wind Turbine Blades' for publication in Wind Energy. This paper presents these results and provides a summary of the strengths and weaknesses of the proposed optical measurement approach in the context of streamlining the blade certification/testing process and performing vision-based structural dynamic measurements on large-scale structures. The obtained results have shown that the proposed approach can detect in-plane displacement as low as 0.2 mm, mechanical strain with an error below 3% when compared with measurement performed using strain gages, and the first five natural frequencies with an error below 2% when compared with data recorded using traditional wire-based accelerometers. Furthermore, operational modal analysis was used in conjunction with the multicamera system to estimate the natural frequencies and mode shapes of the wind turbine blade.

The proposed system has the potential to streamline the certification process by reducing the blade's preparation and sensor installation cost and time to a few hundreds of dollars (for painting equipment) and a few days for preparing the surface of the blade for the test. In this study, a multicamera measurement system is implemented and experimentally evaluated to obtain full-field displacement and strain over a similar to 12-m-long portion of a similar to 60-m utility-scale wind turbine blade. These systems are expensive, require a time-consuming installation (e.g., up to 3 weeks and $35 k-$50 k for a strain gage system on a 55-m-long blade), are difficult to deploy on large-sized structures, require additional instrumentations (e.g., power amplifiers and data acquisition systems), and produce results only at a handful of a discrete number of measurement points. Usually, these tests are conducted by using wire-based sensors such as strain gages, accelerometers, and string potentiometers. Wind turbine blade certification requires static and fatigue testing at a large-scale facility similar to the Wind Technology Testing Center (WTTC) located in Charlestown, Massachusetts.