Figure 4.

Bending and stretching sensing performance of the elastic fiber. (a) The elastic optical fiber is bent 100 cycles with a bending radius of 5 mm. (b) Tensile test of the U-shaped elastic fiber being stretched 100 cycles at the strain range 0~50%. (c) Comparison of sensing performance between straight and U-shaped elastic fibers during strain increase from 0 to 50% and back to 0. Tensile test of elastic fiber being stretched 50 cycles with 50% applied peak strain at different temperatures, (d) 10 °C, (e) 20 °C, (f) 30 °C, (g) 40 °C, (h) 50 °C. (i) The average normalized light intensity curve at 650 nm for five temperatures.