闪光X射线衍射成像系统设计及实验方法
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摘要
为实现材料在冲击加载下微观动力学响应测量,基于小型闪光X射线源开展衍射成像系统设计.利用直流X光机及高纯锗探测器实现系统衍射光路的精确调节,克服了闪光X射线瞬时强度高及连续辐射本底强导致的衍射角度确定困难,并采用Scandiflash AB公司TD-450S和成像板建立了衍射成像系统.应用该系统在冲击加载实验中获得了LiF单晶单脉冲的Mo-Kα线静态及动态衍射图像.该闪光X射线衍射系统时间分辨率可达25ns,为冲击压缩实验中材料瞬时结构变化测量提供了新的实验方法.
Flash X-ray diffraction imaging system based on flash X-ray generator(TD-450S of Scandiflash AB)and imaging plate was designed to measure microscopic response in shock wave compression studies.Due to intense Bremsstrahlung radiation,continuous X-ray generator and HPGe detector were used to regulate diffraction optical path.Diffraction signal of LiF single crystal was recorded using flash X-ray tube with molybdenum as the anode material under ambient conditions and shocked state.Results show that flash X-ray diffraction imaging system described here is useful for examining structural changes in shock compression experiments and temporal resolution is 25 ns.
Flash X-ray diffraction imaging system based on flash X-ray generator(TD-450S of Scandiflash AB)and imaging plate was designed to measure microscopic response in shock wave compression studies.Due to intense Bremsstrahlung radiation,continuous X-ray generator and HPGe detector were used to regulate diffraction optical path.Diffraction signal of LiF single crystal was recorded using flash X-ray tube with molybdenum as the anode material under ambient conditions and shocked state.Results show that flash X-ray diffraction imaging system described here is useful for examining structural changes in shock compression experiments and temporal resolution is 25 ns.
引文
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[2]JOHNSON Q,MITCHELL A C.First X-ray diffraction evidence for a phase transition during shock-wave compression[J].Physics Review Letter,1972,29(20):1369-1371.
[3]RIGG P A,GUPTA Y M.Real-time X-ray diffraction to examine elastic-plastic deformation in shocked lithium fluoride crystals[J].Applied Physics Letter,1998,73(12):1655-1657.
[4]RIGG P A.Real-time X-ray diffraction to examine lattice deformation in shocked lithium fluoride crystals[D].PhD thesis,Washington State University,1999.
[5]ALMEIDA T D,GUPTA Y M.Real-time X-ray diffraction measurement of the phase transition in KCl shocked along100[J].Physics Review Letter,2000,85(2):330-333.
[6]TURNEAURE S J,GUPTA Y M.Real-time X-ray diffraction at the impact surface of shocked crystals[J].Journal of Applied Physics,2012,111:026101.
[7]TURNEAURE S J,GUPTA Y M.Real time synchrotron X-ray diffraction measurements to determine material strength of shocked single crystals following compression and release[J].Journal of Applied Physics,2009,106:033513.
[8]CHIN A H,SCHOENLEIN R W,GLOVER T E,et al.Ultrafast structural dynamics in InSb probed by time-resolved X-ray diffraction[J].Physics Review Letter,1999,83(2):336-339.
[9]WARK J S,WHITLOCK R R,HAUER A,et al.Shock launching in silicon studied with use of pulsed X-ray diffraction[J].Physical Review B,1987,35(17):9391-9394.
[10]WARK J S,WHITLOCK R R,HAUER A,et al.Subnanosecond X-ray diffraction from laser-shocked crystals[J].Physical Review B,1989,40(8):5705-5715.
[11]REN Xi,CHEN Jun,HAN Ke-hua,et al.Application of flash radiography on explosion[J].Explosive Materials,2009,38(6):21-23.任西,陈军,韩克华,等.闪光X射线技术在爆炸过程中的成像应用[J].爆破器材,2009,38(6):21-23.
[12]ZHU Yu-rong,XU Shou-shi,TANG Run-di,et al.Experimental technology and analysis of debris cloud image obtained in hypervelocity impact processing[J].Journal of Projectiles Rockets Missiles and Guidance,2005,25(4):357-365.朱玉荣,徐守时,唐润棣,等.高速碰撞过程中的图像诊断[J].弹箭与制导学报,2005,25(4):357-365.
[13]张向荣,唐润棣,胡泽根,等.闪光X射线系统在二级轻气炮实验中的应用[C].第二届全国爆炸力学实验技术交流会,2002年.