An experimental demonstration of fiber optic imaging inside a furnace at 1000 degrees Celsius is described. A sapphire fiber optic video system was designed, fabricated and tested for basic performance in a small tube furnace. The imaging fiber bundle was assembled using 100 high quality sapphire fibers aligned and bonded at each end. Experiments to achieve a high temperature cladding are described. Reference imaging experiments at room temperature were performed with the sapphire fiber bundle and a commercial glass fiber bundle of comparable size. Imaging experiments at 100 degrees Celsius are described and discussed.
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