TY - JOUR
T1 - High sensitivity, low temperature-crosstalk strain sensor based on a microsphere embedded Fabry–Perot interferometer
AU - Tian, Ke
AU - Zhang, Meng
AU - Yu, Jibo
AU - Jiang, Yuxuan
AU - Zhao, Haiyan
AU - Wang, Xin
AU - Liu, Dejun
AU - Jin, Guoyong
AU - Lewis, Elfed
AU - Farrell, Gerald
AU - Wang, Pengfei
N1 - Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2020/8/1
Y1 - 2020/8/1
N2 - In this article, a high sensitivity, low temperature-crosstalk strain sensor based on a microsphere embedded Fabry–Perot interferometer (FPI) is reported and experimentally demonstrated. The sensor is fabricated by embedding a microsphere inside a tapered hollow-core fiber (HCF) whose ends are enclosed by two standard single-mode fibers (SMFs). The reflections occurring at the SMF/HCF interface and the surfaces of the microsphere, result in a three-beam interference. The cavity length of the formed FPI can be flexibly changed by controlling the diameter of the tapered HCF and the size of the embedded microsphere, and the maximum extinction ratio (ER) of the reflection spectrum is greater than 11 dB. This novel microsphere embedded FPI structure significantly enhances the sensing performance of traditional FPIs for strain measurement, providing a high strain sensitivity of 16.2 pm/με with a resolution of 1.3 με. Moreover, it is demonstrated that this strain sensor has a very low temperature-strain cross-sensitivity of 0.086 με/oC, which greatly enhances the potential for applications in the field of precision strain measurement.
AB - In this article, a high sensitivity, low temperature-crosstalk strain sensor based on a microsphere embedded Fabry–Perot interferometer (FPI) is reported and experimentally demonstrated. The sensor is fabricated by embedding a microsphere inside a tapered hollow-core fiber (HCF) whose ends are enclosed by two standard single-mode fibers (SMFs). The reflections occurring at the SMF/HCF interface and the surfaces of the microsphere, result in a three-beam interference. The cavity length of the formed FPI can be flexibly changed by controlling the diameter of the tapered HCF and the size of the embedded microsphere, and the maximum extinction ratio (ER) of the reflection spectrum is greater than 11 dB. This novel microsphere embedded FPI structure significantly enhances the sensing performance of traditional FPIs for strain measurement, providing a high strain sensitivity of 16.2 pm/με with a resolution of 1.3 με. Moreover, it is demonstrated that this strain sensor has a very low temperature-strain cross-sensitivity of 0.086 με/oC, which greatly enhances the potential for applications in the field of precision strain measurement.
KW - Fabry-Perot
KW - Fiber optic sensor
KW - Microsphere
KW - Speciality fiber
KW - Strain sensor
KW - Temperature dependence
UR - http://www.scopus.com/inward/record.url?scp=85084949084&partnerID=8YFLogxK
U2 - 10.1016/j.sna.2020.112048
DO - 10.1016/j.sna.2020.112048
M3 - Article
AN - SCOPUS:85084949084
SN - 0924-4247
VL - 310
JO - Sensors and Actuators, A: Physical
JF - Sensors and Actuators, A: Physical
M1 - 112048
ER -