A strain sensor based on core-distortion long-period fiber grating

• Published in: IEEE photonics technology letters Vol. 35; no. 24; p. 1
• Main Authors: Li, Yuanyuan, Li, Min, Tian, Tian, Dai, Zizhao, Ma, Yiwei, Li, Song, Lu, Chunlian, Geng, Tao
• Format: Journal Article
• Language: English
• Published: New York IEEE 15.12.2023; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Carbon dioxide; Carbon dioxide lasers; Claddings; core-distortion; Distortion; Fiber lasers; Gratings (spectra); Heating systems; Laser beam heating; Long period fiber grating (LPFG); Optical fiber communication; Optical fiber sensors; Sensitivity; Strain; Strain measurement; Temperature measurement
• ISSN: 1041-1135; 1941-0174
• DOI: 10.1109/LPT.2023.3325428

A compact strain sensor based on core-distortion long-period fiber grating (CD-LPFG) is proposed and investigated. The manufacturing of the sensor includes pre-twisted CO 2 laser polishing and hydrogen-oxygen flame heating method, which leads to the characteristic of periodic core-distortion of the fiber structure. Within the strain measurement range of 0-350 με, the proposed sensor exhibits a high strain sensitivity of -41 pm/με. Additionally, within the temperature measurement range of 25-100 °C, the sensor demonstrates a temperature sensitivity of 56 pm/°C. Furthermore, the sensor has a compact structure with a length of only 5mm, making it highly suitable for precise measurement applications in limited spaces.