Broadband Multimode Terahertz Imaging for Detection of Corrosion and Defects Under Hull Coatings

In this Phase I SBIR program, we propose to utilize earlier DoD funded research in terahertz spectroscopy and imaging, image processing, feature extraction, and dynamic processing of large datasets to craft a scalable architecture for nondestructive defect analysis defect analysis of large naval structures. PNTS teaming partners at Wright State University (WSU) have been at the forefront of the development of terahertz-based non-destructive evaluation (NDE) measurements. The team"s collective work has demonstrated that both continuous-wave and time-domain terahertz (THz) spectroscopy and imaging techniques are effective for the evaluation of the physical characteristics and intrinsic material properties of a wide range of structures and components. Given the myriad of platforms and processing technologies potentially useful for these tasks, the team"s extensive experience in both time domain terahertz (THz-TDS) and continuous wave terahertz (THz-CW) will be leveraged to define an optimal suite of architectured solutions for this topic, without removal of the coatings to meet with unrestricted operation (URO) maintenance requirement card (MRC) specifications. The team will also employ both THz-TDS and THz-CW systems to analyze test coupons with surface coatings consistent with NAVSEA approved coatings for submarine exterior underwater hull anticorrosive and antifouling system preservation.