20~1 250 Hz光纤加速度传感系统设计 -

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20~1 250 Hz光纤加速度传感系统设计

doi:10.3788/CO.20171004.0469

顾宏灿^1,,
黄俊斌^1,,,
程玲²,
杨光³,
毛欣¹

1.
海军工程大学兵器工程系, 湖北武汉 430033
2.
中国舰船研究院, 北京 100101
3.
海军大连舰艇学院, 辽宁大连 116013

基金项目:

海军工程大学科研基金项目201300000583

详细信息

作者简介:
顾宏灿(1980-), 男, 江苏靖江人, 博士, 讲师, 主要从事光纤传感、光电测试等方面的研究。E-mail:tanktomb@163.com
黄俊斌(1965-), 男, 湖南湘潭人, 博士, 教授, 博士生导师, 主要从事光纤水听器、船舶结构安全光纤传感监测、光电测试等方面的研究

通讯作者:
黄俊斌, E-mail:tsyj98@163.com

中图分类号:TN253
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- 被引次数:0
出版历程
- 收稿日期:2017-03-06
- 修回日期:2017-04-10
- 刊出日期:2017-08-01

20-1 250 Hz fiber laser acceleration sensing system

1.
Department of Weapon Engineering, Naval University of Engineering, Wuhan 430033, China
2.
China Ship Research Institute, Beijing 100101, China
3.
China Dalian Naval Academy, Dalian 116013, China

Funds:

Science Foundation of University of Navy Engineering201300000583

More Information

Corresponding author:HUANG Jun-bin, E-mail:tsyj98@163.com

摘要

摘要:为了实现高灵敏度、宽频响应的光纤型加速度传感器，以光纤器作为加速度传感器的传感元件，建立了光纤加速度传感系统，并对该系统的传感原理、灵敏度和谐振频率等性能进行了分析和实验。采用竖直式加速度传感器结构，结构中的传感组件主要由质量块和中空的细钢管组成，光纤器受预应力作用后粘接在钢管内部，在加速度作用下，钢管产生的应变引起光纤器的应变和折射率发生改变，导致光纤器的出射波长随之发生改变，然后使用干涉解调技术检测出波长的动态变化，即可获得波长中包含的加速度振幅和频率信息。实验结果表明，在20~1 250 Hz频段内，竖直式光纤加速度传感器的灵敏度约为-126.2 dB[参考值1 rad/（μm/s ²）]，频响曲线的波动幅度在±1.9 dB范围内，加速度响应动态范围为77.46~170.26 dB[500 Hz频点，参考值1 μm/（s ²·Hz ^1/2）]，加速度分辨率优于0.01 m/s ²。
- 光纤器/
- 加速度传感/
- 竖直式结构/
- 干涉解调
Abstract:In order to realize a fiber accelerometer with high-sensitivity and wide band, the fiber laser is used as sensor element to establish a fiber laser acceleration sensing system. The sensing principle and performance parameters, such as sensitivity and resonance frequency, are elaborated and analyzed. If the fiber laser acceleration sensor is a vertical type, the structure consists mainly of an inertial mass and a steel hollow tube. The fiber laser is fixed in the steel tube after tensing, and the acceleration causes displacement of the sensor case relative to the inertial mass and the strain tube. So the acceleration will produce the distortion of the fiber laser and change the wavelength of the laser. Using the interferometric interrogation system, the amplitude and frequency information of the acceleration signal can be demodulated. The experimental results show that the phase sensitivity is -126.2 dB[reference value:1 rad/(μm/s ²)] and the fluctuation amplitude of the sensitivity during 20-1 250 Hz is ±1.9 dB. The dynamic range of the acceleration response at the 500 Hz frequency is 77.46-170.26 dB[reference value:1 μm/(s ²·Hz ^1/2)]. The fiber laser accelerometer system can work with 0.01 m/s ²acceleration resolution during 20-1 250 Hz.
- fiber laser/
- acceleration sensor/
- vertical type/
- interferometric interrogation

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图 1DFB光纤器结构示意图

Figure 1.Configuration of DFB fiber laser

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图 2光纤加速度传感系统示意图

Figure 2.System configuration of fiber laser acceleration sensor

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图 3敏感元件的网格模型

Figure 3.Grid model of sensitive element

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图 4传感器敏感元件的频响曲线

Figure 4.Frequency response curve of sensitive component of sensor

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图 5光纤加速度传感器

Figure 5.A fiber laser acceleration sensor

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图 6光纤加速度传感器测试实验系统

Figure 6.Test system of fiber laser acceleration sensor

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图 7振动频率500 Hz时解调仪的输出信号

Figure 7.Output signal of interrogator when vibration frequency is 500 Hz

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图 8光纤加速度传感器线性度

Figure 8.Linearity testing result of fiber laser acceleration sensor

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图 9光纤加速度传感器的加速度灵敏度频响曲线

Figure 9.Acceleration sensitivity frequency response cur-ves of fiber laser acceleration sensor

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图 10光纤加速度计的一阶振型图

Figure 10.First-order mode of fiber laser accelerometer

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图 11光纤加速度传感器输出信号的噪声功率谱密度级

Figure 11.Noise power density of output signal of fiber laser acceleration sensor

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