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Schematic drawing of the new ratiometric multiple pH/Oxygen planar optode (the oval part) and measuring system with JAI AT-200GE 3CCD camera. The oval part indicates the drawing of the pH/Oxygen sensor composed of a three layer system containing the depicted indictor and reference dyes. Filter: 455 nm longpass. LED: high power LED (peak wavelength 405 nm) as a light source.
