聚龙一号装置的强电磁干扰对PDV的影响研究
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摘要
光子多普勒测速系统(PDV)常采用全光纤模式,操作方便,已成为材料超高压动态实验获取动力学特性的重要诊断技术。测速范围和精度与光电传感器和数据采集仪器有关,激光到达靶面后返回光电转换器,速度由多普勒引起的频率变化直接解读。聚龙一号装置是开展材料动态实验的重要平台,放电电流峰值5～8MA,0～100%上升时间300～750ns。在装置放电过程中,靶室和大厅中的强电磁干扰可以达到10～300MHz,当干扰耦合进返回光信号后,导致速度剖面解读困难。采用聚四氟乙烯绝缘膜和导电铝膜包覆测速探针很好地抑制了强电磁干扰信号对光信号的干扰,大大提高了速度测量数据的有效性。
Photonic Doppler velocimetry(PDV)is usually based on all-fiber mode,which is easy to operate and has become an important diagnostic technology for ultra-high pressure dynamic material properties experiments.The range and accuracy of velocity measurement are related to photoelectric converter and data acquisition instruments.When the optical signal reflected by the target returns to the photoelectric converter,the frequency of laser intensity is changed by Doppler effect.The PTS facility is an important platform for dynamic material properties experiments.The peak current is 5-8 MA and the 0-100%rise time is 300-750 ns.During the loading process,there is strong electromagnetic interference in the target chamber,whose frequency are 10-300 MHz.When the interference is coupled into the return optical signal,the velocity data will be covered.Using PTFE insulating film and conductive aluminium film coated velocity probe can suppress the interference of strong electromagnetic interference signal to optical signal,and greatly improve the validity of velocity measurement data.
Photonic Doppler velocimetry(PDV)is usually based on all-fiber mode,which is easy to operate and has become an important diagnostic technology for ultra-high pressure dynamic material properties experiments.The range and accuracy of velocity measurement are related to photoelectric converter and data acquisition instruments.When the optical signal reflected by the target returns to the photoelectric converter,the frequency of laser intensity is changed by Doppler effect.The PTS facility is an important platform for dynamic material properties experiments.The peak current is 5-8 MA and the 0-100%rise time is 300-750 ns.During the loading process,there is strong electromagnetic interference in the target chamber,whose frequency are 10-300 MHz.When the interference is coupled into the return optical signal,the velocity data will be covered.Using PTFE insulating film and conductive aluminium film coated velocity probe can suppress the interference of strong electromagnetic interference signal to optical signal,and greatly improve the validity of velocity measurement data.
引文
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[2]马云，胡绍楼，汪小松，等．样品-窗口界面运动速度的VISAR测试技术[J]．高压物理学报，2003,17(4):290-294.(Ma Yun,Hu Shaolou,Wang Xiaosong,et al.VISAR measurement on interface velocity between shocked specimen and window.Chinese Journal of High Pressure Physics,2003,17(4):290-294)
[3] Weng J D,Wang X,Tao T J,et al.Optic microwave mixing velocimeter for super high velocity measurement[J].Rev Sci Instrum,2011,82:123114.
[4] Dolan D H.Accuracy and precision in photonic Doppler velocimetry[J].Rev Sci Instrum,2010,81:053905.
[5] Deng Jianjun,Xie Weiping,Feng Shuping,et al.From concept to reality—a review to the primary test stand and its preliminary application in high energy density physics[J].Matter Radiat Extreme,2016,1:48-58.
[6]夏明鹤，计策，王玉娟，等．PTS装置工作模式及波形调节[J]．强激光与粒子束，2012,24(11):2768-2772.(Xia Minghe,Ji Ce,Wang Yujuan,et al.Current pulse shaping of load on Primary Test Stand facility.High Power Laser and Particle Beams,2012,24(11):2768-2772)
[7]郭帆，王贵林，邹文康，等．聚龙一号装置磁驱动加载实验的全电路模拟[J]．强激光与粒子束，2018,30:125001.(Guo Fan,Wang Guilin,Zou Wenkang,et al.Full circuit calculation of magnetically driven experiment on PTS facility.High Power Laser and Particle Beams,2018,30:125001)
[8]王贵林，王治，张朝辉，等．磁驱动准等熵下单晶氟化锂的光学特性[J]．强激光与粒子束，2014,26:045030.(Wang Guilin,Wang Zhi,Zhang Zhaohui,et al.Optical properties of single-crystal lithium fluoride window under magnetically driven quasi-isentropic compression.High Power Laser and Particle Beams,2014,26:045030)
[9] Martin M R,Lemeke R W,McBride R D,et al.Solid liner implosions on Z for producing multi-megabar,shockless compression[J].Physics of Plasmas,2012,19:056310.
[10] Zou Wenkang,Dan Jiakun,Wang Guilin,et al.Investigation of surface evolution for stainless steel electrode under pulsed megagauss magnetic field[J].Physics of Plasmas,2018,25:022120.
[11]段书超，谢卫平，王刚华，等．完全稳定化MRT的可能性及应用于聚变的潜力[J]．强激光与粒子束，2018,30:020101.(Duan Shuchao,Xie Weiping,Wang Ganghua,et al.Possibility of complete stabilization of magneto-Rayleigh-Taylor instabilities and potential for fusion.High Power Laser and Particle Beams,2018,30:020101)
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