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Microwave nondestructive testing of coatings and paints using free-space microwave measurement system

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4 Author(s)
D. K. Ghodgaonkar ; Fac. of Electr. Eng., MARA Univ. of Technol., Selangor, Malaysia ; N. Hj Hamzah ; K. Faizin Hj Che Kasim ; Z. Awang

Microwave nondestructive testing (MNDT) techniques are applied to evaluate quality of anti-corrosive protective coatings and paints on metal surfaces. A free-space microwave measurement (FSMM) system is used for MNDT of protective coatings. The FSMM system consists of transmit and receive spot-focusing horn lens antennas, a vector network analyzer, mode transitions and a computer. Diffraction effects at the edges of the sample are minimized by using spot-focusing horn lens antennas. Errors due to multiple reflections between antennas are corrected by using free-space LRL (line, reflect, line) calibration technique. We have measured complex reflection coefficient of polyurethane based paint which is coated on brass plates.

Published in:

Telecommunication Technology, 2003. NCTT 2003 Proceedings. 4th National Conference on

Date of Conference:

14-15 Jan. 2003