基于光子多普勒测速的长景深动态测试研究

目前光子多普勒测速的应用场景多为瞬时、短时的冲击、震动、飞片等测量，采集时间少、景深距离短，缺少长景深动态测试的应用。为此我们搭建了一套全光纤结构PDV以及基于LabWindows的上位机解调软件，以15 kHz线宽1550.12 nm激光器为光源，300 mm工作距离非球面镜作为探头，针对运动距离为1.33 m、最高速度14 m/s的无杆气缸滑块进行速度测量。通过多次实验，得出了无杆气缸滑块运动的全程速度曲线，并用积分反推出运动距离与实际滑块运动距离相符，平均相对误差为-0.5266%。实验结果表明，光子多普勒测速系统健壮性良好，在信号光耦合功率低的情况下仍可以得到16 dB以上信噪比的干涉信号，大气环境稳定时可在长景深范围内进行动态测量。

Dynamic measurement of long depth of fieldbased on photonic Doppler velocimetry

At present,the application of Photonic Doppler Velocimetry is mostly aimed at measuring instantaneous and short term impact,vibration or the velocity of flying plate,with less acquisition time and short depth of field distance.Up till now,there is lack of application in measuring moving objects with a long depth of field.For this reason,a set of PDV based on all fiber structure and upper computer demodulation software based on LabWindows are built.It uses a laser module with 15 kHz line width and 1550.12 nm wave length as light source,an aspherical lens with 300mm working distance as probe.Speed measurement for rodless cylinder slider with a moving distance of 1.33 m and a maximum speed of 14 m/s.Through many experiments,the whole time velocity diagram of rodless cylinder is obtained.Moving distances calculated by integration are in consistent with the actual one,the average relative error of which is -0.5266%.The experimental result shows that PDV has a strong robustness,and an interference signal with SNR above 16 dB,even the coupled signal power is low.While there is a stable atmosphere,such PDV can be used in measuring moving objects with large depth of field.