Automated Radome Dielectric Sensor

PSI proposes to develop a Non-Destructive Evaluation (NDE) system for missile radomes based on time-domain THz technology. The proposed NDE system will identify defects that can lead to failure during flight through signatures in the time-domain THz waveform. Furthermore, the spatially localized THz measurement will provide a map of the THz dielectric properties of the radome. This map will be extrapolated to the microwave frequencies used by the seeker, thus allowing arbitrary radome-seeker pairings and reducing the cost of radome manufacturing and maintenance. In the proposed Phase I effort, PSI will characterize the THz dielectric properties of coupons of radome materials. PSI will then use laser machining to generate simulated defects the radome material coupons and characterize these defects using a time domain THz apparatus. These experimental results will be used to define the requirements of the Phase II prototype apparatus, and a preliminary system level design will be completed. The Phase I effort will provide the foundation for a successful Phase II program resulting in a prototype NDE apparatus capable of scanning a radome with THz radiation and providing data that can be used to map the dielectric constant of the radome and identify and locate defects.