Technique for Measuring Transmittance of Optical Windows under Dynamic Loading and Its Application
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摘要: 报道一种用于气炮加载条件的窗口透射率测量技术。该技术将一种激发电压低(4.5 V)、响应时间快(约500 ns)、输出功率稳定的半导体脉冲光源设置在弹丸内部,在碰靶前激发出光,作为照明光源,用于观测透明样品/窗口在加载过程中的透射率变化。将该技术用于石英玻璃冲击透明性研究,发现石英玻璃在经冲击压缩再卸载到水的过程中,其透射率下降了近30%,该结果不支持文献中所给出的液态水压致固化的解释。Abstract: A measurement technique for optical transmittance of window material under gas-gun-driven shock loading condition was developed, in which a pulsed light source of semiconductor laser was mounted in the projectile and along its central axis to measure the transmittance change of transparent sample during loading and unloading processes. The advantages of the light source over the traditional xenon-lamp are: (1) the work voltage is only 4.5 V; (2) the response time is less than 500 ns; (3) the output power is stable. The improved method provides an important tool for studying the transparency change, absorption, and failure of brittle materials. Quartz glass, as an example, is found to partially lose its transparency during the unloading process after shock compression of 1.8 GPa, and the decrease of transmittance is as high as 30%. The results do not support the explanation of liquid-solid phase transition given by literature.
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Key words:
- optical windows /
- shock /
- release /
- transmittance
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Hao G Y, Liu F S. Optical Emission of Directly Contacted Copper/Sapphire Interface under Shock Compression of Megabar [J]. Appl Phys Lett, 2007, 90(26): 2619142-2619147. Guo J L, Liu F S, Hao G Y, et al. Temperature Measurement for the Interface of the Dense Bulk Iron/Sapphire Window under Shock Compression [J]. Chinese Journal of High Pressure Physics, 2008, 22(4): 414-418. (in Chinese) 郭锦良, 刘福生, 郝高宇, 等. 块状密实铁/蓝宝石界面的冲击温度测量 [J]. 高压物理学报, 2008, 22(4): 414-418. Root S, Gupta Y M. Optical Spectroscopy and Imaging of Liquid Benzene Multiply Shocked to 13 GPa [J]. Chem Phys Lett, 2007, 442(2): 293-297. Zhou X M, Wang X S, Li S N, et al. Optical transparency of z-Cut LiF, Al2O3 and LiTaO3 Single Crystals under Strong Shock Compression [J]. Acta Phy Sin, 2007, 56(3): 4965-4970. (in Chinese) 周显明, 汪小松, 李赛男, 等. 强冲击压缩下LiF, Al2O3 和LiTaO3单晶的透光性 [J]. 物理学报, 2007, 56(3): 4965-4970. Kobayashi T, Sekine T. In Situ Raman Spectroscopy of Shock-Compressed Benzene and Its Derivatives [J]. Phys Rev B, 2000, 65(9): 5281-5284. Matsuda A, Kondo K, Nakamura K G. Nanosecond Rapid Freezing of Liquid Benzene under Shock Compression Studied by Time-Resolved Coherent Anti-Stokes Raman Spectroscopy [J]. 2006, Phys Rev B, 124(5): 054501(1)-054501(4). Jones S C, Gupta Y M. Refractive Index and Elastic Properties of Quartz Shocked to 60 kbar [J]. J Appl Phys, 2000, 88(10): 5671-5679. Lalone B M, Fat'yanov, Asay J R, et al. Velocity Correction and Refractive Index Changes for [100] Lithium Fluoride Optical Windows under Shock Compression, Recompression, and Unloading [J]. J Appl Phys, 2008, 103(9): 093505(1)-093505(7). Jones S C, Robinson M C, Gupta Y M. Ordinary Refractive Index of Sapphire in Uniaxial Tension and Compression along the c Axis [J]. J Appl Phys, 2003, 93(2): 1023-1029. Dolan D H, Ao T. Cubic Zirconia as a Dynamic Compression Window [J]. Appl Phys Lett, 2008, 93(2): 021908(1)-021908(3). Duall G E, Orilvie K M, Wilson R, et al. Optical Spectroscopy in a Shocked Liquid [J]. Nature, 1982, 296: 846-847. Dolan D H. Time Dependent Freezing of Water under Multiple Shock Wave [D]. Washington: Washington State University, 2003. Li J, Zhou X M, Li J. A Time-Resolved Single-Pass Technique for Measuring Optical Absorption Coefficients of Window Materials under 100 GPa Shock Pressures [J]. Rev Sci Instrum, 2008, 79(12): 123107. Shi S C, Chen P S, Huang Y. Velocity Measurement of Magnet Induced System for Projectile [J]. Chinese Journal of High Pressure Physics, 1991, 5(3): 205-214. (in Chinese) 施尚春, 陈攀森, 黄跃. 高速弹丸的磁感应测速方法 [J]. 高压物理学报, 1991, 5(3): 205-214. Jing F Q, Chen J X. Dynamic High-Pressure Generation Principle and Related Technologies [M]. Beijing: National Defence Industry Press, 2006. (in Chinese) 经福谦, 陈俊祥. 动高压原理与技术 [M]. 北京: 国防工业出版社, 2006. Dolan D H, Gupta Y M. Time-Dependent Freezing of Water under Dynamic Compression [J]. Chem Phys Lett, 2003, 374(3): 608-612. Dolan D H, Gupta Y M. Nanosecond Freezing of Water under Multiple Shock Wave Compression: Optical Transmission and Imaging Measurements [J]. J Chem Phys, 2004, 121(18): 9050-9057. Merrill L. Behavior of the AB2 Type Compounds at High Pressures and High Temperatures [J]. J Phy Chem Ref Data, 1982, 11(4): 1005-1064. Walsh J M, Rice M H. Dynamic Compression of Liquids from Measurements on Strong Shock Waves [J]. J Chem Phys, 1957, 26(4): 815-823. Trunin R F. Shock Compression of Condensed Materials (Laboratory Studies) [J]. Phys-Usp, 2001, 44(4): 371-396. Rybakov A P. Phase Transformation of Water under Shock Compression [J]. J Appl Mech Tech Phys, 1996, 37(5): 629-633.
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