Fiber laser based on a fiber Bragg grating and its application in high-temperature sensing

Application of DTS in high-temperature monitoring of alumina electrolysis bath

“…Aluminum is one of the most commonly used industrial metals and is an important basic raw material for national economic development 1 . Since 1886, when Hall in the U.S. and Heroult in France invented the process of aluminum production called as electrolysis, the process of electrolytic aluminum has been developing rapidly, and as the alumina electrolysis bath becomes larger and larger, the risk of breakage and leakage increases 2 . Currently most of these temperatures are measured using manual portable infrared thermometers 3 4 , on one hand, workers are labor-intensive and the working environment with high temperature and strong magnetic field affects the physical and mental health of workers, on the other hand, the infrared thermometer is easy to fail in a strong magnetic field environment and cannot measure the temperature continuously in real-time, so the hidden problems cannot be found in time 5 .…”

Temperature sensing technique by using a microwave photonics filter based on an actively mode‐locked fiber laser

“…Various temperature sensors based on fiber lasers have been proposed and experimentally demonstrated. Ye et al have proposed an erbium-doped fiber (EDF) ring laser structure for remote temperature sensing, in which the sensing elements are fiber Bragg gratings (FBGs) and the sensitivity is 15.2 pm/ C. 9 Huang et al have proposed a linear cavity fiber laser based on a Sagnac loop for temperature sensing, and the sensitivity is approximately 15.9 pm/ C. 10 Cai et al have proposed temperature sensor based on a multi-wavelength fiber ring laser, in which a section of polarization maintaining fiber (PMF) performs as a sensing element and the sensitivity of the sensor is 1.8063 nm/ C. 11 With the rapid development of microwave photonics technology, it has been employed in the sensing systems due to the advantages of low cost, high sensitivity, and easy implementation. 12 Yang et al have proposed a temperature sensing scheme based on a fiber ring microwave photonics filter (MPF) with EDF amplification, and the sensitivity is 11.74 kHz/ C when the passband at 1.6 GHz is adopted for temperature monitoring.…”

“…Ye et al have proposed an erbium‐doped fiber (EDF) ring laser structure for remote temperature sensing, in which the sensing elements are fiber Bragg gratings (FBGs) and the sensitivity is 15.2 pm/°C 9 . Huang et al have proposed a linear cavity fiber laser based on a Sagnac loop for temperature sensing, and the sensitivity is approximately 15.9 pm/°C 10 . Cai et al have proposed temperature sensor based on a multi‐wavelength fiber ring laser, in which a section of polarization maintaining fiber (PMF) performs as a sensing element and the sensitivity of the sensor is 1.8063 nm/°C 11 .…”

Compact Optical Fiber Lasers and Optical Fiber Sensors assisted by Femtosecond Laser Inscription of Plane-by-Plane FBGs

“…There are high-temperature fiber laser sensors employing fs-FBGs as part of the cavity that work up to 1000 o C [8]. However, laser cavity is achieved by means of a sagnac loop which increases its length and complexity.…”