1 石家庄铁道大学 河北省交通安全与控制重点实验室, 河北 石家庄 050043
2 石家庄铁道大学 交通运输学院, 河北 石家庄 050043
3 石家庄铁道大学 河北省大型结构健康诊断与控制实验室, 河北 石家庄 050043
4 石家庄铁道大学 机械工程学院, 河北 石家庄 050043
5 石家庄铁道大学 材料科学与工程学院, 河北 石家庄 050043
为实现中高频振动信号的测量，本文设计了一种基于轴承和柔性铰链结构的光纤布拉格光栅加速度传感器。首先，基于理论力学模型推导出其固有频率、灵敏度与结构参数的数学模型，然后进行结构优化设计，并制作了传感器实物。在此基础上，对所设计传感器动态特性进行有限元仿真和实验测试。研究结果表明：传感器工作频率为10～1200 Hz，加速度灵敏度达17.25 pm/g，测量误差小于0.3 g，线性度大于0.99，重复性误差为2.33%，且能实现温度补偿。
传感器 加速度传感器 光纤布拉格光栅 中高频 轴承 柔性铰链 sensor accelerometer fiber Bragg grating mid-high frequency bearing flexure hinge
Author Affiliations
Abstract
1 School of Traffic and Transportation, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
2 Optoelectronic System Laboratory, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
A new structure of short-cavity random fiber laser (RFL) with narrow linewidth lasing is proposed. A -phase-shifted fiber Bragg grating (FBG) loop mirror was used in the RFL for spectral filtering and to suppress multi-mode oscillation due to the narrow transmission window. The random feedback of the RFL was implemented by a randomly dispersed weak reflection FBG array. The high gain of the erbium-doped fiber and a half-open cavity design results in a low lasing threshold. The linewidth of the laser was 225 Hz with 58 dB side-mode-suppression ratio. The laser threshold was 4.5 mW, and the optical signal-to-noise ratio was up to 63 dB.
060.3735 Fiber Bragg gratings 060.2370 Fiber optics sensors Chinese Optics Letters
2019, 17(9): 090605
Author Affiliations
Abstract
1 School of Traffic and Transportation, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
2 State Key Laboratory of Transducer Technology, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
3 College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China
In this paper, an inclinometer based on a vertical pendulum and a fiber Bragg grating Fabry–Perot cavity (FBG-FP) is proposed. A low-damping rotation structure is used to reduce the mechanical frictions of the pendulum system and induce a wavelength shift of FBG-FPs. We find that the sensitivity can be maximized by optimizing the parameters of the inclinometer. Using a high-resolution demodulation system, a sensitivity of 179.9 pm/(°), and a resolution better than 0.02″ can be achieved. Experiments also show that the proposed inclinometer has good linearity and repeatability.
060.3735 Fiber Bragg gratings Chinese Optics Letters
2018, 16(11): 110603
Author Affiliations
Abstract
1 School of Traffic and Transportation, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
2 Optoelectronic System Lab, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
The bonded distributed feedback (DFB) fiber laser (FL) acoustic emission sensor and the intensity response of the DFB-FL to external acoustic emissions are investigated. The dynamic sensitivity of the DFB-FL is calibrated by a referenced piezoelectric receiver. In the DFB-FL we used here, the minimum detectable signal is 2×10 6 m/s at 5 kHz. Using wavelet packet technology, the collected signals are analyzed, which confirms that an intensity-modulated DFB-FL sensor can be used to detect acoustic emission signals.
060.2370 Fiber optics sensors 140.3490 Lasers, distributed-feedback 140.3510 Lasers, fiber Chinese Optics Letters
2016, 14(12): 120602
以心功能、血气、脑电图作为参数,评价了Ｈｅ-Ｎｅ激光麻醉对马生理功能的影响。
激光麻醉 心功能 血气 脑电图
