GDI, an award-winning provider of applied technology solutions, announces that it has now added the use of the Skygauge drone to its range of marine sector capabilities. By adding airborne robotics, GDI can now take ultrasonic thickness measurements of large uncoated and painted surfaces, such as corrugated bulkheads and web frames. The technology has been proven, with certain limitations on the areas that can be reached, in demonstrations with four major classification societies.
During discussions with various class societies, GDI was provided with information regarding the working relationship between companies certified by TM and RIT.
Working in conjunction with approved TM suppliers does not change the process of liability, validation of measurements, and reporting. GDI considers the drone to be a new additional tool which wirelessly supports the work of the TM engineer. The TM engineer remains responsible for validating measurements by executing a proper calibration and judging the accuracy by looking at the full A-scan. The TM engineer will report the values as usual within the different formats of each individual classification society. 
Among the salient characteristics of the Skygauge drone is the fact that 100% alignment with the contact surface is not required. The drone aligns itself by arranging an equal cup pressure of 20 Nm to the surface. Furthermore, artificial aids based on LIDAR assist the operator in estimating the alignment and movement to the next measurement position. The system’s software provides continuous measurements and delivers an indication of the accuracy of the readings as well as a final reading.
GDI points out that there are certain limitations, with some environments posing a challenge to the onboard sensors. According to David Knukkel, “It is a matter of time and effort to increase the operating areas of the drone. This technology is like a river; you need to control and steer the flow by learning how to live with and use the possibilities rather than trying to fight nature. After all, water flows naturally to the ocean.”