基于边缘滤波解调的光纤光栅低频地震检波器
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摘要
研究了悬臂梁结构的光栅振动加速度传感器并提出了一种圆柱体形光纤Bragg光栅地震检波器模型,用边缘滤波的解调方法对此检波器的性能进行了实验研究。研究表明:所提出的光纤Bragg光栅地震检波器的方案是可行的,而且具有很高的检测精度、灵敏度、失真度和长期的稳定性,通过改变圆柱体内的阻尼,可使检波器的带宽和性能得到进一步提高;通过对质量块的调节,固有频率为140 Hz,灵敏度可达到69 pm/g。解调检测波长灵敏度可达-1.27 pm/mV,系统的波长分辨力为1.1 pm。
The grating acceleration sensor with structure of cantilever beam is studied, and a cylinder-shaped cantilever structure of fiber Bragg grating geophone model is proposed. The edge filter method of demodulation performance of this detector are studied. The study shows that the design of fiber Bragg grating geophone is viable and has high precision, sensitivity, distortion and long-term stability. By changing the damping inside the cylinder will enable detector bandwidth and performance to improve. This seismic geophone is immuned from any electromagnetic inter-ference. With adjusting the mass, the inherent frequency of 140 Hz, and the sensitivity of 69 pm/9 are achievcd.The sensitivity of detection wavelength demodulation is-1.27 pm/mV,and the wavelcngth resolution of 1.1 pm.
The grating acceleration sensor with structure of cantilever beam is studied, and a cylinder-shaped cantilever structure of fiber Bragg grating geophone model is proposed. The edge filter method of demodulation performance of this detector are studied. The study shows that the design of fiber Bragg grating geophone is viable and has high precision, sensitivity, distortion and long-term stability. By changing the damping inside the cylinder will enable detector bandwidth and performance to improve. This seismic geophone is immuned from any electromagnetic inter-ference. With adjusting the mass, the inherent frequency of 140 Hz, and the sensitivity of 69 pm/9 are achievcd.The sensitivity of detection wavelength demodulation is-1.27 pm/mV,and the wavelcngth resolution of 1.1 pm.
引文
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[8]孙 丽,梁德志,李宏男,等.等强度梁标定FBG传感器的误差分析与修正[J].光电子·激光,2007,18(7):776-779.
[9] Murukeshan Y M, Chan P Y, Ong L S,et al. Cure monitoring of smart composites using fiber Bragg grating based embedded sensors[J]. Sensors and Actuators, 2000, 79: 153-161.
[10] Dong Xinyon, Liu Yunqi, Liu Zhiguo, et al. Simultaneous displacement and temperature measurement with cantilever-based fiber Bragg grating sensor[J]. Optics Communications, 2001, 192: 213-217.
[11]李忠超.光纤Bragg光栅振动加速度测量系统的设计与研究[D].秦皇岛:燕山大学,2006:26-30.
[12]秦子雄,曾庆科,项 阳,等.大调谐范围的等强度梁光纤光栅波长调节器[J].光学学报,2001,21(12):1421-1425.
[2] Nellen Ph M. Mauron P, Frank A, et al. Reliability of fiber Bragg grating based sensors for downhole applications [J]. Sensors and Actuators, 2003, (A 103): 364-376.
[3]徐平,庞拂飞,陈娜,等.基于菲涅耳反射的准分布式光纤温度传感器[J].中国激光,2008,35(12):1955-1958.
[4]陈建军,张伟刚,涂勤昌,等.基于光纤光栅的高灵敏度流速传感器[J].光学学报,2006,26(8):1136-1139.
[5]张锦龙,余重秀,王葵如,等.基于啁啾光纤光栅的温度自补偿位移传感器[J].光学学报,2008,28(4):779-782.
[6]杨 剑,赵 勇,倪行洁.新型光纤光栅水声传感器的研究[J].光学学报,2007.27(9):1575-1579.
[7]戴锋,黄国君.一种布喇格光纤光栅加速度传感器[J].激光杂志,2005.26(1):26-27.
[8]孙 丽,梁德志,李宏男,等.等强度梁标定FBG传感器的误差分析与修正[J].光电子·激光,2007,18(7):776-779.
[9] Murukeshan Y M, Chan P Y, Ong L S,et al. Cure monitoring of smart composites using fiber Bragg grating based embedded sensors[J]. Sensors and Actuators, 2000, 79: 153-161.
[10] Dong Xinyon, Liu Yunqi, Liu Zhiguo, et al. Simultaneous displacement and temperature measurement with cantilever-based fiber Bragg grating sensor[J]. Optics Communications, 2001, 192: 213-217.
[11]李忠超.光纤Bragg光栅振动加速度测量系统的设计与研究[D].秦皇岛:燕山大学,2006:26-30.
[12]秦子雄,曾庆科,项 阳,等.大调谐范围的等强度梁光纤光栅波长调节器[J].光学学报,2001,21(12):1421-1425.
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