Salinity and Temperature Dual-Parameter Sensor Based on Fiber Ring Laser with Tapered Side-Hole Fiber Embedded in Sagnac Interferometer

Zhao，Fang1; Lin，Weihao1,2; Hu，Jie1; Liu，Shuaiqi1,2; Yu，Feihong1; Chen，Xingwei1; Wang，Guoqing3; Shum，Perry Ping1; Shao，Liyang1,4

2022-11-01

10.3390/s22218533

SENSORS   Impact Factor & Quartile

1424-8220

1424-8220

This paper presented a new kind of salinity and temperature dual-parameter sensor based on a fiber ring laser (FRL) with tapered side-hole fiber (SHF) embedded in a Sagnac interferometer. The sensing structure is majorly composed of tapered SHF located in the middle of SHF inside the Sagnac interferometer loop structure. The influences of the SHF’s diameters of different tapered in the Sagnac interferometer loop on the FRL sensing system are studied. The presence of air holes in the SHF makes the cladding mode easier to excite, and the interaction between the cladding mode with its surroundings is enhanced, thus having higher salinity sensitivity. Besides, the unique advantages of high resolution, narrower linewidth, and high signal-to-noise ratio (SNR) of fiber laser make the measurement results more accurate. In this experiment, the SHF with different taper diameters was made, and it was found that reducing the diameter of the taper waist diameter could further improve the salinity sensitivity. When the waist diameter was 9.70 μm, the maximum salinity sensitivity of 0.2867 nm/‰ was achieved. Temperature sensing experiments were also carried out. The maximum temperature sensitivity of the FRL sensing system was −0.3041 nm/°C at the temperature range from 20 to 30 °C. The sensor has the characteristics of easy manufacture, good selectivity, and high sensitivity, proving the feasibility of simultaneous measurement of seawater salinity and temperature.

Sagnac interferometer salinity sensor tapered dual-side-hole fiber

SCI ; EI

English

First ; Corresponding

Guangdong Science and Technology Department[2021A0505080002];

Chemistry ; Engineering ; Instruments & Instrumentation

Chemistry, Analytical ; Engineering, Electrical & Electronic ; Instruments & Instrumentation

WOS:000883580200001

MDPI

20224613125793

Fiber optic sensors ; Fibers ; Interferometers ; Ring lasers ; Signal to noise ratio ; Temperature sensors

Information Theory and Signal Processing:716.1 ; Fiber Optics:741.1.2 ; Lasers:744 ; Solid State Lasers:744.4 ; Optical Instruments:941.3 ; Temperature Measuring Instruments:944.5

CHEMISTRY

2-s2.0-85141626268

Scopus

1.Department of Electrical and Electronic Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.State Key Laboratory of Analog and Mixed-Signal VLSI,University of Macau,999078,Macao
3.School of Microelectronics,Shenzhen Institute of Information Technology,Shenzhen,518172,China
4.Peng Cheng Laboratory,Shenzhen,518005,China

Zhao，Fang,Lin，Weihao,Hu，Jie,et al. Salinity and Temperature Dual-Parameter Sensor Based on Fiber Ring Laser with Tapered Side-Hole Fiber Embedded in Sagnac Interferometer[J]. SENSORS,2022,22(21).

Zhao，Fang.,Lin，Weihao.,Hu，Jie.,Liu，Shuaiqi.,Yu，Feihong.,...&Shao，Liyang.(2022).Salinity and Temperature Dual-Parameter Sensor Based on Fiber Ring Laser with Tapered Side-Hole Fiber Embedded in Sagnac Interferometer.SENSORS,22(21).

Zhao，Fang,et al."Salinity and Temperature Dual-Parameter Sensor Based on Fiber Ring Laser with Tapered Side-Hole Fiber Embedded in Sagnac Interferometer".SENSORS 22.21(2022).