摘要
以时分复用的低反射光纤Bragg光栅传感系统的高速解调系统为应用对象,研究了以电压比较器型峰值保持电路为核心的多点应变传感的高速采集系统。设计了脉宽低于5ns信号的电压比较器型峰值保持电路,以阻抗匹配原理优化电路参数及输出阻抗,并结合宽带匹配放大电路,实现传感信号的高速采集系统。为验证高速采集系统有效性,开展了悬臂梁的光纤Bragg光栅应变传感实验,测试了传感系统应变与负载的非线性关系。实验结果表明,峰值保持电路响应信号上升迅速且平滑,稳定时间约为15ns,线性相关度为0.999 2,线性度优于2%,悬臂梁的光纤Bragg光栅应变传感系统的误差为4%。
A high-speed acquisition system based on voltage-comparator-type peak-holding circuit is studied for ultra multi-point strain measurement, and will be applied in high-speed demodulation of low-reflectivity fiber Bragg grating sensing network with time-division multiplex. A voltage-comparator-type peak-holding circuit for signal of pulse duration less than 5 ns is designed, and then its circuit parameters and output impedance are adjusted and optimized with the imped- ance matching principle. The high-speed acquisition system for this sensing signal is accomplished together with a broadband matching amplifier circuit. The sensing-strain experiments of fiber Bragg grating with cantilever is carried on to verify the high-speed acquisition system, and the non-linear relationship between loads and signal responses is tested. Experimental results show that the peak-holding circuit possesses a rapid smooth rise edge with setting time approximately 15 ns, with a linear correlation of 0. 999 2, and linearity is better than 2%, and that the sensingstrain system of fiber Bragg grating with cantilever is approximately 4% error.
出处
《西安理工大学学报》
CAS
北大核心
2014年第3期293-298,共6页
Journal of Xi'an University of Technology
基金
国家自然科学基金资助项目(61275185
61308106)
陕西省自然科学基金资助项目(2013JM5001)
陕西省教育厅科研计划资助项目(11JK0868)
关键词
光纤光栅传感
时分复用技术
数据采集技术
高速峰值保持
fiber Bragg grating sensing
time division multiplexing technique
data acquisition technique
high speed peak holding
