Abstract
AbstractIn this work, a linear eight element array of electric field sensors is realized for non-destructive testing of dielectric composite widely used in aerospace, medical, and automotive fields. An electrically short dipole antenna array was printed on photo paper using silver conductive ink, and the antenna transmission line was printed using polymer-based resistive ink. A zero bias Schottky diode was employed as the RF detector, and the output voltage was fed to a micro-volt meter. Planar dielectric composite sample of 3 mm thickness was illuminated by an X band (8–12 GHz) spot focusing horn antenna. An FR-4 sample of size 300 mm × 300 mm with a defect diameter of 20 mm was tested with this setup. First , the response from a defect free calibration sample is taken. Then , the measurement is carried out on the defective sample. The sensor array was used to map the electric field strength in defect free and defective regions of the sample.KeywordsCompositesElectric field sensor arrayMicrowave NDESpot focusing horn antenna
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