Design of Flexible Curvature Sensor Based on SMF-PDMS-DCF
In order to overcome the defects of small curvature range and low sensitivity of existing curvature sensor,a SMF-PDMS-DCF flexible curvature sensor with single mode fiber(SMF)and double core fiber(DCF)as the interference structure was designed.A flexible material called polydimethylsiloxane(PDMS)was used as a coupler to soft connect single-mode fiber and dual-core fiber.The cantilever beam was made of PDMS material and double core optical fiber.The curvature could be detec-ted by bending the cantilever beam.Experimental results show that when the curvature is within 0～4.119 8 m-1,the wavelength and intensity of the reflected light have a good linear relationship with the curvature.From the relationship between the wavelength and the curvature,the sensitivity is up to-0.311 8 nm/m-1.From the relationship between the light intensity and the curvature,the sensitivity can be up to-1.671 5 dB/m-1.
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