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Flexible hollow-fiber bundle for body temperature imaging

For infrared thermal imaging of body temperature, a flexible and coherent bundle of hollow optical fibers was fabricated. Differences in the transmission efficiency among the fibers were numerically compensated to obtain high temperature resolution of 1°C for measuring body temperature. In a lens system with 10-fold magnification and hollow fibers of 320- μm inner diameter, the spatial resolution is around 3 mm. The hollow-fiber bundle enables observation of the surface temperature of inner organs and blood flow of the surfaces when the bundle is introduced into the human body with an endoscope.