趋势项对激光测振结果影响的实验研究  

Experimental Research on Influence of Trend Terms on Laser Vibration Measurement Results

作　　者：丁宇洁 刘科[1] 刘格格 DING Yujie;LIU Ke;LIU Gege(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：《仪表技术与传感器》2023年第12期122-126,共5页Instrument Technique and Sensor

摘　　要：针对激光测振系统研制中,相位解调结果出现趋势项导致测量结果偏差大的问题开展了研究。在1550 nm全光纤激光多普勒测振系统研制中,采用马赫-泽德干涉仪结构搭建了外差探测光路,产生携带物体运动信息的激光多普勒信号,采用相位解调法进行信号解调,并采用最小二乘法消除相位解调结果的趋势项。实验结果表明:通过消除趋势项,高频振动的测量结果准确度得到了明显提升,在1~10 kHz振动频率范围内,加速度最大测量误差由1.79%降低至-0.15%。Aiming at the problem of large deviation in measurement results caused by trend terms in phase demodulation re-sults of the developed laser vibration measurement system,the research was carried out.In the development of 1550 nm all fiber laser Doppler vibration measurement system,a heterodyne detection optical path was constructed using Mach-Zehnder interferome-ter structure,to generate laser Doppler signals carrying the object motion information.Phase demodulation method was used for signal demodulation,and least squares method was adopted to eliminate trend terms in phase demodulation results.The experi-mental results indicate that,by eliminating the trend terms,the accuracy of the measurement results of high-frequency vibration is significantly improved.Within the vibration frequency range of 1 kHz to 10 kHz,the maximum measurement error of acceleration is reduced from 1.79%to-0.15%.

关 键 词：振动计量 激光测振 外差探测 相位解调 趋势项 最小二乘法 

分 类 号：TB936[一般工业技术—计量学]