694 M A T E R I A L S E V A L U A T I O N • J U L Y 2 0 2 1 AUTHOR Robert (Bob) Dahlstrom: Apellix, Working Drones Inc., Jacksonville, FL r.dahlstrom@apellix.com CITATION Materials Evaluation 79 (7): 687–694 https://doi.org/10.32548/2021.me-04213 ©2021 American Society for Nondestructive Testing REFERENCES ASTM, 2021, ASTM E1316 – Standard Terminology for Nondestructive Examinations, ASTM International, West Conshohocken, PA, https://doi.org/10.1520/E1316-21 Dahlstrom, R., 2020, “The Efficacy of Aerial Robotic Systems (Drones) for Taking Dry Film Thickness (DFT) Meas- urements at Height Consistent with SSPC PA2 Standards” available at https://www.academia.edu/35709547/the _efficacy_of_aerial_robotic_systems_drones_for_taking _dry_film_thickness_dft_measurements_at_height _consistent_with_sspc_pa2_standards Global Electronic Services, 2021, “Guide to Inspection Robots Used in Industrial Sectors,” accessed 12 May 2021, https://gesrepair.com/guide-inspection-robots-used -industrial-sectors/ Mattar, R., 2018, “Development of a Wall Sticking Drone for Non-Destructive Ultrasonic and Corrosion Testing,” Inspec- tioneering Journal, Vol. 24, No. 2, https://inspectioneering .com/journal/2018-04-25/7567/development-of-a-wall -sticking-drone-for-non-destructive-ultraso Skaga, S.K., 2017, “Feasibility Study of Unmanned Aerial Vehicles (UAV) Application for Ultrasonic Non-Destructive Testing (NDT) of Wind Turbine Rotor Blades. Preliminary Experiments of Handheld and UAV Ultrasonic Testing on Glass Fibre Laminate,” Master’s Thesis, The Arctic University of Norway, available at https://hdl.handle.net /10037/11350 Vrana, J., 2020, “NDE 4.0: The Fourth Revolution in Non- Destructive Evaluation: Digital Twin, Semantics, Interfaces, Networking, Feedback, New Markets and Integration into the Industrial Internet of Things,” https://doi.org /10.13140/RG.2.2.17635.50720 ME FEATURE w aerial robots for ut thickness measurements