Figure 7
From: Efficiency, error and yield in light-directed maskless synthesis of DNA microarrays
Global flare is due to dust and imperfections of optical elements and leads to a homogenous background exposure of the synthesis surface. With a UV intensity at the center of the image plane (gray squares in insets), global flare is measured from ON mirrors at the periphery of the DMD (white border of insets), which do not image directly into the detector. Global flare increases almost linearly with the number of ON mirrors. The central square in the inserts represents the photo-detector and the outer bands represent the number of ON mirrors. For 25% ON mirrors the irradiance (W/cm2) value is about 0.04% of direct irradiance.