A dimension reduction fiber-optic array is used to measure the response of a stacked-layer, image-guide CO<sub>2</sub>/O<sub>2</sub> sensor, simultaneously at several different wavelengths. Two different image-guide CO<sub>2</sub>/O<sub>2</sub> sensor configurations are described: a stacked-layer sensor, where luminescence indicators for CO<sub>2</sub> and O<sub>2</sub> are uniformly coated on the tip of the sensor; and a side-by-side coated sensor where the two indicators are coated on different halves of the fiber tip. It is shown that a single image-guide measurement, made by using the dimension reduction array, can be used to generate response plots, intensity profiles, and reconstructed images at different luminescence wavelengths. The spatial resolution of an image guide sensor is limited by the number of fibers used to construct the dimension reduction array.

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