基于激光相位法测量光纤长度
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摘要
针对百米内光纤长度的测量设计了一种新型的激光测量光纤长度系统。该系统依据相位式激光测距原理,通过对激光光强的调制、利用光在传输过程中的相位延迟与光纤长度之间的线性关系测量光纤长度。激光的调制发射由正弦信号与基准电压经过求和电路实现,相位延迟量由探测器接收信号与调制信号经过模拟鉴相后获得,AD数据采集后由单片机处理及显示。实验表明,系统测量光纤长度的稳定度小于0.66 m,最大绝对误差小于0.25 m,最大相对误差小于1.2%。利用该方法设计的光纤长度测量系统电路简单有效、功率小,且具有较高的测量精度和稳定性。
A new type of fiber length laser measuring system is designed to measure the fiber length in 100 meters. Based on the principle of laser distance measurement,modulating the intensity of laser light,the length of the fiber is measured by the linear relationship between the phase delay and the length of the optical fiber. The modulation of the laser is realized by the sine signal and the reference voltage. After the detector receives the signal and the modulation signal passes through the analog phase demodulation,phase retardation that is related to the length of the optical fiber is obtained,and the data is processed by the MCU after AD acquisition. The stability of the system is less than 0. 66m; the maximum absolute error is less than 0. 33m; the maximum relative error is less than 1. 6%. The optical fiber length measurement system designed by this method is simple and effective,low in power,and high in accuracy and stability.
A new type of fiber length laser measuring system is designed to measure the fiber length in 100 meters. Based on the principle of laser distance measurement,modulating the intensity of laser light,the length of the fiber is measured by the linear relationship between the phase delay and the length of the optical fiber. The modulation of the laser is realized by the sine signal and the reference voltage. After the detector receives the signal and the modulation signal passes through the analog phase demodulation,phase retardation that is related to the length of the optical fiber is obtained,and the data is processed by the MCU after AD acquisition. The stability of the system is less than 0. 66m; the maximum absolute error is less than 0. 33m; the maximum relative error is less than 1. 6%. The optical fiber length measurement system designed by this method is simple and effective,low in power,and high in accuracy and stability.
引文
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[10]廖平,蔡玉鑫.改进型相位式激光测距电路的设计[J].激光与红外,2013,43(4):356-359.
[11]段淋淋,崔一平.新型便携式激光测距仪的原理及方案设计[J].电子器件,2009,32(1):195-199.
[12]周睿,孔东.一种高精度相位激光测距方法的实现[J].科学技术与工程,2009,9(21):6337-6342.
[13]张志勇,张靖,朱大勇,等.一种快速、高精度激光相位测距方法的研究[J].仪器仪表学报,2005,26(8):51-53.
[14]刘卫东,刘延冰,刘建国.检测微弱光信号的PIN光电检测电路的设计[J].电测与仪表,1999,36(4):27-29.
[15]杨力.先进光学制造技术[M].北京:科学出版社,2001:318-325.
[2]满小晶,董毅,何浩,等.基于短时傅里叶变换的光时域反射计事件分析[J].仪器仪表学报,2010,31(9):2121-2125.
[3]贾波,钱松荣,华中一,等.全光纤干涉系统用于光纤长度测量实验[J].中国激光,2002,29(1):73-75
[4]李楚瑞,王超,肖倩.基于全光纤干涉的新型光纤长度测量系统[J].仪器仪表学报,2011,32(2):415-419.
[5]叶全意,杨春.基于相位调制光链路的光纤长度测量系统[J].中国激光,2013,40(5):157-161.
[6]Alekseev A E,Vdovenko V S,Uorshkov B U,et al.A phase-sensitive optical time-domain reflectometer with du-al-pulse diverse frequency probe signal[J].Laser Physics,2015,25(6):1-10.
[7]汪涛.相位激光测距技术的研究[J].激光与红外,2007,37(1):29-31.
[8]张竞,王向军.相位式激光测宽仪的设计和实现[J].电子测量技术,2007,30(9):125-128.
[9]FANG Gao-sheng,XU Tuan-wei,FENG Shengwen,et al.Phase-sensitive optical time domain reflectometer based on phase generated carrier algorithm[J].Journal of Light-wave Technology,2015,33(13):2811-2816.
[10]廖平,蔡玉鑫.改进型相位式激光测距电路的设计[J].激光与红外,2013,43(4):356-359.
[11]段淋淋,崔一平.新型便携式激光测距仪的原理及方案设计[J].电子器件,2009,32(1):195-199.
[12]周睿,孔东.一种高精度相位激光测距方法的实现[J].科学技术与工程,2009,9(21):6337-6342.
[13]张志勇,张靖,朱大勇,等.一种快速、高精度激光相位测距方法的研究[J].仪器仪表学报,2005,26(8):51-53.
[14]刘卫东,刘延冰,刘建国.检测微弱光信号的PIN光电检测电路的设计[J].电测与仪表,1999,36(4):27-29.
[15]杨力.先进光学制造技术[M].北京:科学出版社,2001:318-325.