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Volume inspection of composite structures in aircraft radomes with FMCW terahertz radar at 100 and 150 GHz

: Bauer, Maris; Keil, Andreas; Matheis, Carsten; Jonuscheit, Joachim; Moor, Michael; Denman, David; Bramble, Jamie; Savage, Nick; Friederich, Fabian


Institute of Electrical and Electronics Engineers -IEEE-:
IRMMW-THz 2018, 43rd International Conference on Infrared, Millimeter, and Terahertz Waves : 9-14 September 2018, Nagoya Congress Center, Nagoya, Japan
Piscataway, NJ: IEEE, 2018
ISBN: 978-1-5386-3809-5
ISBN: 978-1-5386-3808-8
ISBN: 978-1-5386-3810-1
3 pp.
International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) <43, 2018, Nagoya>
Conference Paper
Fraunhofer ITWM ()

We present a terahertz imaging system for aircraft radome inspection based on a dual-frequency FMCW radar working at center frequencies of 100 and 150 GHz and with 40 and 60 GHz bandwidth, respectively. The imaging sensor combines two all-electronic multiplier chains at the respective frequencies and is integrated in the production environment of radomes built of glass fiber-reinforced composite structures. While images acquired at the two distinct working frequencies can yield different information of possible structural defects, at the same time, a data fusion algorithm is applied combining the signals of both terahertz sensors for enhanced depth resolution by a total FMCW bandwidth of 100 GHz.