1550 nm全光纤激光多普勒测振系统研制  

Development of 1550 nm all⁃fiber laser Doppler vibration measurement system

作　　者：丁宇洁 刘格格 刘科[1] DING Yujie;LIU Gege;LIU Ke(Metrology and Testing Center,China Academy of Engineering Physics,Mianyang 621900,China)

机构地区：[1]中国工程物理研究院计量测试中心,四川绵阳621900

出　　处：《计测技术》2023年第2期57-63,共7页Metrology & Measurement Technology

基　　金：国家装备技术基础项目(211ZW22003)。

摘　　要：针对目前国内激光测振系统价格昂贵、使用不便的问题,采用1550 nm波段成熟的窄线宽光源和光纤元器件研制了一套低成本的全光纤激光测振系统原理样机。此原理样机光路部分采用马赫-泽德干涉仪结构,搭建了外差式激光干涉光路,参考光被40 MHz的声光调制器调制,与测量光在光电探测器表面发生干涉,产生原始的激光多普勒信号;信号解调部分采用相位解调法对原始激光多普勒信号进行解调,得到振动目标的运动特性,包括位移、速度和加速度信息。采用本单位的振动标准装置对其性能进行了测试,实验结果表明:在10~2000 Hz的中低频振动范围内,1550 nm全光纤激光多普勒测振系统峰值位移、速度和加速度的测量误差在-0.6%~0.7%内。该系统在中低频段具有较高的测量准确度,且成本相对较低、操作便捷,具有技术借鉴价值。Research has been conducted on the issue of high price and inconvenience in use of laser vibration measurement system.A low⁃cost prototype of all⁃fiber laser vibration measurement system is developed by using 1550 nm mature narrow linewidth light source and optical fiber components.In the optical path part,a heterodyne laser interferometer is built using Mach⁃Zehnder interferometer struct ure,the reference light is modulated by a 40 MHz acousto⁃optic modulator and interferes with the measurement light on the photodetector surface to produce the original laser Doppler signal.In the signal demodulation part,the phase demodulation method is used to demodulate the original laser Doppler signal to obtain the motion characteristics of the vibration target,including the displacement,velocity and acceleration information.The performance of this prototype is tested with the vibration standard device in our center,and the experimental results show that,the measurement errors of peak displacement,velocity and acceleration of this 1550 nm all⁃fiber laser vibration measurement system are within the range of-0.6%~0.7%,in the medium to low vibration frequency range of 10~2000 Hz.This system has both high measurement accuracy in medium to low vibration frequency range,and relatively low cost,convenient operation,which has technical reference value.

关 键 词：振动计量 全光纤激光测振 相位解调 

分 类 号：TB936[一般工业技术—计量学] TH825[机械工程—测试计量技术及仪器]