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(a) Photograph of the fiber optic sensor attached to the wrist. (b) Optical loss of the fiber optic sensor over time during the forearm muscle movement. (c) Schematic illustration showing a breath sensor fabricated by attaching a fiber optic sensor directly above the abdomen. (d) Optical loss of the fiber optic sensor over time during human breath monitoring. Among them, (a,b) are exhalation, (b,c) are inhalation.
