Subsurface Corrosion Imaging System Based on LASER Generated Acoustic (LGA)

• DOI: 10.18517/ijaseit.7.6.2816
• Publication Date: 2017-12-29T15:11:53Z
• Authors: Andreas Setiawan; Gede Bayu Suparta; Mitrayana Mitrayana; Waskito Nugroho
• Keywords: 0103 physical sciences; 01 natural sciences

Corrosion process might occur over or beneath the surface of a material. Under-the-surface corrosion is more dangerous than other types as it visually hidden. This research develops an imaging system to detect crevices resulting from subsurface corrosion. The built with laser-generated acoustic (LGA) method, – using photoacoustic phenomena generate waves laser and material interaction process, construct image metal. Though optical actuator used, deeper penetration achieved in wave sensing, causing change intensity they pass crevices. Measurement wave's used LGA illustrating condition object. There are three main components device, which laser, microphone data processor. beam modulated exposed object create thermal contraction. records generated processor analyses result. Comprehensive measurement done entire 2-dimensional images. reports experimental result on LGA's images produced showed reasonably clear evolution In experiment, emerge at 230µm depth were detected first 5 hours process. An advance analysis that able show shape during A mathematical model, based transmission equation, designed further examine curve fits MAPE 12% difference.