Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
Optical Fiber Sensing Engineering Technology R&D Center of Guangdong Province, T&S Communications Co., Ltd., Shenzhen 518118, China.
Sensors (Basel). 2023 Mar 3;23(5):2811. doi: 10.3390/s23052811.
The existing optical strain sensors based on fiber Bragg grating (FBG) have limitations, such as a complex structure, a limited strain range (±200 με) and poor linearity performance (R-squared value < 0.9920); these limitations affect their potential practical applications. Here, four FBG strain sensors equipped with planar UV-curable resin are investigated. The proposed FBG strain sensors have a simple structure, a large strain range (±1800 με) and excellent linearity performance (R-squared value ≥ 0.9998); they further produce the following performances: (1) good optical properties, including an undistorted Bragg peak shape, narrow bandwidth (-3 dB bandwidth ≤ 0.65 nm) and a high side mode suppression ratio (SMSR, the absolute value of SMSR ≥ 15 dB); (2) good temperature sensing properties with high temperature sensitivities (≥47.7 pm/°C) and a good linearity performance (R-squared value ≥ 0.9990); and (3) excellent strain sensing properties with no hysteresis behavior (hysteresis error ≤ 0.058%) and excellent repeatability (repeatability error ≤ 0.045%). Based on their excellent properties, the proposed FBG strain sensors are expected to be applied as high-performance strain sensing devices.
现有的光纤布拉格光栅（FBG）基光学应变传感器存在结构复杂、应变范围有限（±200με）和线性度性能差（R 方值<0.9920）等局限性，这些局限性影响了它们的潜在实际应用。在这里，研究了四个配备平面紫外光固化树脂的 FBG 应变传感器。所提出的 FBG 应变传感器具有结构简单、应变范围大（±1800με）和优异的线性度性能（R 方值≥0.9998）；它们进一步产生以下性能：（1）良好的光学性能，包括无失真的布拉格峰值形状、窄带宽（-3dB 带宽≤0.65nm）和高边模抑制比（SMSR，SMSR 的绝对值≥15dB）；（2）良好的温度传感性能，具有较高的温度灵敏度（≥47.7pm/°C）和良好的线性度性能（R 方值≥0.9990）；（3）优异的应变传感性能，无滞后行为（滞后误差≤0.058%）和出色的重复性（重复性误差≤0.045%）。基于其优异的性能，预计所提出的 FBG 应变传感器将作为高性能应变传感装置得到应用。
