Abstract
In this paper, a novel strain sensor based on Depth-Modulated Long Period Fiber Grating (DM-LPFG) is presented and demonstrated. One side polished deformations with different milling depth are fabricated by a high frequency CO2 laser, so the DM-LPFG possesses a staircase-shaped structure. This kind of structure provides the high strain sensitivity of DM-LPFG. Experimental results clearly demonstrate that the structure has excellent mechanicalcapacity and repeatability. The sensor has a considerable strain sensitivity, which can reach up to 27.4 pm/με with the range of 0–450 με, it is an order of magnitude higher than conventional CO2 laser induced LPFG. The temperature characteristic is 49 pm/°C with the range of 30–170 °C. Furthermore, the strain sensor possesses a compact structure, with a total length of 9 mm.
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