Barbarin Yohan, Le Blanc Gaël, d'Almeida Thierry, Hamrouni Marin, Roudot Marie, Luc Jérôme
CEA, DAM, GRAMAT, BP 80200, F-46500 Gramat, France.
Rev Sci Instrum. 2020 Dec 1;91(12):123105. doi: 10.1063/5.0027331.
Multiplexed photonic Doppler velocimetry systems are developed to measure velocities with high density in physics experiments such as shock physics experiments on novel materials. Decreasing the mesh size can lead to crosstalk issues, which can be overcome by wavelength multiplexing. Crosstalk has been characterized on a line of eight collimators with a pitch of 1 mm. A crosstalk-free photonic Doppler velocimetry system with 16 telecom wavelengths was built. Wavelength multiplexing provides as well a reduction in the total number of fiber components. The system was designed for velocities up to 1000 m/s and with a bandwidth of 2 GHz. In the frequency domain, the channel spacing is 100 GHz, which is more than enough to prevent any crosstalk. A ramp compression experiment was carried out by a high-pulsed-power generator to demonstrate the dynamic performances of the crosstalk free system at about 80 m/s.
多路复用光子多普勒测速系统被开发用于在诸如新型材料的冲击物理实验等物理实验中进行高密度速度测量。减小网格尺寸会导致串扰问题，而波长复用可以克服这一问题。已经在间距为1毫米的八个准直器阵列上对串扰进行了表征。构建了一个具有16个电信波长的无串扰光子多普勒测速系统。波长复用还减少了光纤组件的总数。该系统设计用于测量高达1000米/秒的速度，带宽为2吉赫兹。在频域中，通道间距为100吉赫兹，足以防止任何串扰。通过高脉冲功率发生器进行了斜坡压缩实验，以展示无串扰系统在约80米/秒时的动态性能。
