Real-time 2D pH images by fast scanning light-addressable Potentiometrie sensor system controlled by LabVIEW program

Up to now, real-time two dimensional (2D) chemical images are not available in a simple platform, results from big data with low generating rate by complicated process including movement of light source and ultra-low current measurement. A synchronization of all inputs including coordination of scanning step, ac signal of laser spot, and dc bias of LAPS is achieved by a field-programmable gate array (FPGA)-based system and self-developed LabVIEW program. Photocurrent, pH response, 2D pH images of different resolution of Si₃N₄/SiO₂ LAPS can be easily obtained by this system. It could be integrated with microfluidics for a real-time Lab-on-chip with biomedical sensor array.