Table 1 A few types of in-fiber FPI-based strain sensors with air cavities
From: High-sensitivity strain sensor based on in-fiber rectangular air bubble
cavity structure | strain sensitivity | cavity size | reference |
|---|---|---|---|
elliptical air bubble | 6.0 pm/με | 46 μm | Ref. 19 |
hollow-core ring PCF | 15.4 pm/με | 13 μm | Ref. 17 |
micro-bubble | 4 pm/με | 91 μm | Ref. 15 |
air hole | 6 pm/με | 80 μm | Ref. 13 |
spheroidal cavity+PCF | 2.7 pm/με | 58 μm | Ref. 14 |
spheroidal cavity | 10.3 pm/με | 10 μm | Ref. 16 |
rectangular air bubble | 43 pm/με | 61 μm | this work |
