Abstract

In this paper, a novel chain-shaped long-period fiber grating (CS-LPFG) for strain measurement is investigated and experimentally demonstrated. This structure is achieved by polishing periodic slant planes on a single-mode fiber with a high-frequency ${{\rm CO}_2}$ laser. The chain-shaped structures improved the strain sensitivity of the sensor while shortening the length of the sensing unit. Experimental results show that the strain sensitivity of CS-LPFG is 34.8 pm/$\unicode{x00B5}\unicode{x03B5}$ in the range of 0–650 $\unicode{x00B5}\unicode{x03B5}$, and the total length of the sensing unit is significantly reduced to 7.5 mm. Meanwhile, the temperature-strain cross talk is 1.6 $\unicode{x00B5}\unicode{x03B5}$/°C, which is much lower than that of most fiber strain sensors.

© 2020 Optical Society of America

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