Experimental study on a parallel optical fiber Sagnac loops-based sensor with the advantages of both high sensitivity and ultra-wide measurement range

被引:2
|
作者
Liu, Chaoyi [1 ,2 ]
Chen, Hailiang [1 ,2 ]
Gu, Mingqi [1 ,2 ]
Li, Lida [1 ,2 ]
Shi, Ruyue [1 ,2 ]
Zhang, Sa [1 ,2 ]
Ullah, Sajid [1 ,2 ]
Gao, Zhigang [1 ,2 ]
Ma, Mingjian [1 ,2 ]
Yang, Sigang [3 ]
Shum, Perry Ping [4 ]
机构
[1] Yanshan Univ, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Peoples R China
[2] Yanshan Univ, Sch Sci, Key Lab Microstruct Mat Phys Hebei Prov, Qinhuangdao 066004, Peoples R China
[3] Tsinghua Univ, Beijing Natl Res Ctr Informat Sci & Technol, Dept Elect Engn, Beijing 100190, Peoples R China
[4] Southern Univ Sci & Technol, Dept Elect & Elect Engn, Shenzhen 518055, Peoples R China
基金
中国国家自然科学基金;
关键词
Vernier effect; Strain sensor; Temperature sensor; Fiber Bragg grating; Sagnac interferometer; TEMPERATURE SENSOR; INTERFEROMETER; STRAIN;
D O I
10.1016/j.infrared.2024.105174
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
The Vernier effect (VE) in optical interferometers has been used to improve the sensitivity in the measurements of strain, temperature, refractive index, etc. However, as the wavelength shifts beyond a free spectral range (FSR), it is difficult to determine the magnitude of the physical quantity and the measurement range is usually narrow. To overcome this problem, we constructed a fiber optic sensor combining two parallel Sagnac interferometers (PSIs) with a fiber Bragg grating (FBG). The sensitivity of temperature and strain measurements were enhanced about 5 times due to the VE effect in PSIs. FBG spectrum, which showed a monotonic and linear variation trend along with the variation of strain and temperature, was used to estimate the magnitude of the physical quantity beyond the FSR. Finally, an average strain sensitivity of -104.4 pm/mu epsilon was obtained in a wide measuring range of 0-5440 mu epsilon, while an average temperature sensitivity of 6.12 nm/degrees C was obtained in the temperature range of 2-58 degrees C. The measurement range has been extended 6 times and 4 times respectively compared to a single FSR. The integration of PSIs and FBG sensors offers not only high sensitivity, but also a wide measuring range. It can be used in many areas including medical equipment, automotive, and aerospace to make accurate strain and temperature measurements.
引用
收藏
页数:12
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