A New Spring-shaped Long-period Fiber Grating with High Strain Sensitivity
IEEE Photonics Technology Letters(2019)
摘要
A new type of spring-shaped long-period fiber grating (S-S-LPFG) written with CO
2
laser is proposed in this letter. A single-mode fiber is etched clockwise in four directions and any two adjacent etched regions are partially coincident in the vertical direction. The special manufacturing method makes that the S-S-LPFG has satisfactory strain sensitivity. The experimental results prove that the strain sensitivity of the S-S-LPFG is up to 30 pm/
${\mu } \varepsilon $
with the range of 0–
$700~{\mu } \varepsilon $
, which is nearly 18 times higher than that of the normal CO
2
-laser-notched long-period fiber gratings (CO
2
-LPFGs). The temperature sensitivity of the S-S-LPFG is also calculated from the experimental data as 37 pm/°C. It is strongly believed that the S-S-LPFG could be an excellent candidate for the strain sensors.
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关键词
Optical fiber sensors,Strain,Sensitivity,Optical fibers,Fiber gratings,Temperature measurement
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