Abstract
Abstract In this paper, we study the principle and application of a micro-strain sensor with a single mode fiber – tapered photonic crystal fiber – single mode fiber (SMF-TPCF-SMF) structure. The fabrication process and sensing principle of strain sensor are introduced in detail, and the key problems in the application process are solved. A kind of intermittent cooling tapering technique is proposed, which can obtain high quality interference spectrum. We verified that tapering the photonic crystal fiber in the sensor could effectively improve the sensitivity of the sensor. Experimental results showed that the strain sensitivity of the sensor before tapering is 2.75 p m / μ e , and its linear fit is 98.35%; after tapering, the strain sensitivity of the sensor is 5.46 p m / μ e , and its linear fit is 98.59% when the strain range is 109.860 - 559.287 μ e . The improved strain sensor with an SMF-TPCF-SMF structure has high sensitivity, good stability, quick response speed, good invertibility, simple manufacturing process, and low cost. Thus, it has broad application value.
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