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(a) Sensors on the fingers, from gradually bending to relaxing. (b) Changes in optical loss of index finger bending motion at different bending angles. (c) The change in optical loss of the sensor corresponded to the state of (a). (d) The variation of optical loss caused by wrist bending. (e) The variation of optical loss caused by elbow bending. (f) Changes in optical loss due to knee bending.
