Abstract-Manufacture and in-service assessment of composite materials can be challenging since there is, yet, no standard method for testing them. Nevertheless, regular inspection is necessary to maintain structural integrity. This paper describes a non-destructive, broadband noise mapping method that uses a millimeter-wave radiometer to detect defects in composite materials. The W-band system is configured for transmission mode measurement in which an amplified photonic source illuminates a glass fiber reinforced polymer (GFRP) containing machined defects. A high sensitivity radiometer is used for imaging the sample. The radiometer consists of a Schottky diode -based frequency tripler and fundamental mixer.Index Terms-Composite material, fiber reinforced polymer, millimeter wave, mixer, non-destructive, photonic, radiometer, Schottky diode, sensitivity.

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