High-Resolution Temperature Sensor Based on Single-Frequency Ring Fiber Laser via Optical Heterodyne Spectroscopy Technology

Liangcheng Duan; Haiwei Zhang; Wei Shi; Xianchao Yang; Ying Lu; Jianquan Yao

doi:10.3390/s18103245

High-Resolution Temperature Sensor Based on Single-Frequency Ring Fiber Laser via Optical Heterodyne Spectroscopy Technology

Sensors (Basel). 2018 Sep 27;18(10):3245. doi: 10.3390/s18103245.

Authors

Liangcheng Duan¹, Haiwei Zhang², Wei Shi³, Xianchao Yang⁴, Ying Lu⁵, Jianquan Yao⁶

Affiliations

¹ Institute of Laser and Optoelectronics, Key Laboratory of Optoelectronics Information Science and Technology (Ministry of Education), School of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China. dlc@tju.edu.cn.
² Tianjin Key Laboratory of Film Electronic and Communication Device, College of Electrical and Electronic Engineering, Tianjin University of Technology, Tianjin 300384, China. zhanghaiwei@email.tjut.edu.cn.
³ Institute of Laser and Optoelectronics, Key Laboratory of Optoelectronics Information Science and Technology (Ministry of Education), School of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China. shiwei@tju.edu.cn.
⁴ Institute of Laser and Optoelectronics, Key Laboratory of Optoelectronics Information Science and Technology (Ministry of Education), School of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China. yangxianchao@tju.edu.cn.
⁵ Institute of Laser and Optoelectronics, Key Laboratory of Optoelectronics Information Science and Technology (Ministry of Education), School of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China. luying@tju.edu.cn.
⁶ Institute of Laser and Optoelectronics, Key Laboratory of Optoelectronics Information Science and Technology (Ministry of Education), School of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China. jqyao@tju.edu.cn.

Abstract

We demonstrate a high-resolution temperature sensor based on optical heterodyne spectroscopy technology by virtue of the narrow linewidth characteristic of a single-frequency fiber laser. When the single-frequency ring fiber laser has a Lorentzian-linewidth <1 kHz and the temperature sensor operates in the range of 3-85 °C, an average sensitivity of 14.74 pm/°C is obtained by an optical spectrum analyzer. Furthermore, a resolution as high as ~5 × 10^-3 °C is demonstrated through optical heterodyne spectroscopy technology by an electrical spectrum analyzer in the range of 18.26⁻18.71 °C with the figure of merit up to 3.1 × 10⁵ in the experiment.

Keywords: fiber optics sensors; heterodyne spectroscopy; high resolution; single-frequency laser.

Abstract

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