Investigation of a novel temperature-sensing mechanism based onstrain-induced optical path-length difference in a multicore optical fiber

Turkish Journal of Physics

BELKIS GÖKBULUT¹ 

关键词: Fiber optics;    sensors;    interferometry;    temperature;    phase shift;   

DOI  :  

学科分类：物理（综合）

来源: Scientific and Technical Research Council of Turkey - TUBITAK

【 摘 要 】

A four-core optical fiber is employed to investigate a novel temperature-sensing mechanism, which is based on the strain-induced optical path-length difference between the fiber core pairs. A short segment of a four-core fiber is wound around a solid stainless steel cylinder to form a tight circular loop, which is exposed to temperatures of up to 100 $^{\circ}$C. Temperature-induced radial expansion of the stainless steel cylinder causes a shear strain in the fiber and introduces an optical path-length difference between the fiber core pairs. This results in a total phase shift of about 20.40 $\pm $ 0.29 rad in the interference pattern of the four-core fiber, which is monitored by a CMOS camera. The temperature-induced phase and strain sensitivities are measured to be 3.74 rad/m$^{\circ}$C and 0.18 $\mu \varepsilon$/$^{\circ}$C, respectively.

【 授权许可】

Unknown