Performance enhancement approach for a snapshot interferometer sensor of surface inspection

Due to the high level of interest recently accorded to online surface measurement methods by academia and industry, engineers can now measure engineered surfaces rapidly and accurately. The present work involved illumination and individually examining a snapshot dispersive optical interferometer sensor with two different types of high-powered super-luminescent diodes (SLDs). Fringe pattern visibility is crucial to the effectiveness of this kind of interferometer. Two scenarios were introduced to examine the interference pattern visibility for the first-order (scanning range). Compared to the zero-order (reference beam), the first-order (diffraction/measurement beam) is less intense. Undesirable outcomes are generated by the dispersive line beam, like increased noise at a reduced intensity at the scanning range margin. Noise is among the parameters adversely impacting effective signal in all classes of optical measurement sensors; subsequently, sensor resolution measurement is influenced by any elevation in first-order intensity. The measurement noise peak to peak of the analyzed sample was developed from 28 to 20 nm. Consequently, it is possible to apply the snapshot sensor to a next-generation snapshot fiber link interferometry sensor for surface inspection.