Abstract
A new optical fiber twist sensor with temperature compensation mechanism is designed and experimentally demonstrated. The main structure of this twist sensor is a torsion perturbation point cascaded with single mode-multimode-single mode (SMS) fiber structure. The experimental results show that the twist sensor has ability to distinguish the twist direction with sensitivities of 9.5 pm/° and 34.7 pm/° at the chosen dips in the range from −100° (CCW) to 140° (CW). Furthermore, the temperature response characteristic of the sensor is also researched through experiment. Temperature sensitivities of 71.8 pm/°C and 65.2 pm/°C can be obtained at the same dips in the range from 20 °C to 75 °C. In addition, the temperature's influence can be compensated with post-measurement calculation through the cross-matrix. The theoretical resolutions of twist and temperature simultaneous measurement are ±0.084° and ±0.32 °C, respectively.
Highlights
Measurement of physical parameters through optical fiber sensors has received widespread attention in various fields over the past decades
Sensors based on demodulation of birefringence in optical fibers introduced by twist, sensors based on the radial shear stress distribution modulation in the fibers, sensors based on special fibers, and many other sensors [1]
One end of the T-single mode-multimode-single mode (SMS) is fastened on a fixed platform, while the other end is fixed on a rotating platform which can be rotated at any angle
Summary
Measurement of physical parameters through optical fiber sensors has received widespread attention in various fields over the past decades. Various optical fiber twist sensors based on different physical principles have been reported. Twist sensors based on multi-core fiber have received extensive attention from the experts in sensor field and have been reported. Hailiang Zhang et al designed a directional twist sensor using a five-core fiber with a spiral structure in Ref. There are numerous sensors based on special fibers such as, elliptical core few mode fiber [11], two mode fiber (TMF) [25] and square coreless fibers (SCF) [6] have been designed and fabricated for twist sensing. Thereupon, the T-SMS has potential application value in sensor for vehicle, construction engineering quality test and many other fields
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