LiF单晶的高压折射率及窗口速度的修正

赵万广; 周显明; 李加波; 曾小龙

doi:10.11858/gywlxb.2014.05.010

LiF单晶的高压折射率及窗口速度的修正

doi: 10.11858/gywlxb.2014.05.010

中国工程物理研究院流体物理研究所冲击波物理与爆轰物理实验室，四川绵阳 621999

基金项目: 国家自然科学基金委员会-中国工程物理研究院NSAF联合基金(U1230202)

详细信息

作者简介:
赵万广(1985-), 男, 硕士研究生, 主要从事动高压实验技术研究.E-mail:476033060@qq.com

通讯作者:
周显明(1963-), 男, 研究员, 主要从事凝聚态物理研究.E-mail: xzhou0816@163.com

中图分类号: O521.3
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出版历程
- 收稿日期: 2012-12-27
- 修回日期: 2013-02-26

Refractive Index of LiF Single Crystal at High Pressure and Its Window Correction

National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, CAEP, Mianyang 621999, China

摘要

摘要: 通过平板撞击实验，采用激光干涉测试技术，研究了1 550 nm波长下LiF单晶的高压折射率与窗口速度的修正关系，实验压力范围为38~124 GPa，拓展了现有1 550 nm波长下LiF单晶的高压折射率数据，给出了124 GPa压力范围内1 550 nm波长下LiF窗口速度的线性修正方程。研究结果可为分析冲击压缩实验中通过加窗激光多普勒探针测试技术获得的样品界面速度的数据提供参考。
- LiF /
- 多普勒探针系统 /
- 折射率 /
- 窗口速度修正
Abstract: By using plate impact and laser interferometer techniques, the refractive index of shocked LiF single crystal and its window correction at 1 550 nm wavelength were studied.The shock pressure in the LiF sample ranges from 38 to 124 GPa.The present results extend the refractive indexes of LiF single crystal at 1 550 nm, and give a linear LiF window correction relation at 1 550 nm below 124 GPa.The results provide an important reference for data analysis of window-mounted DPS (Doppler pin system) velocity measurement in shock experiment.
- LiF /
- Doppler pin system /
- refractive index /
- window correction

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图 1 样品装置示意图

Figure 1. Schematic diagram of the sample assembly

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图 2 速度测量原理示意图

Figure 2. Schematic diagram of the velocity measurement

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图 3 DPS的输出信号及其速度剖面

Figure 3. DPS output signal and its velocity history

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图 4 LiF单晶的D-u_p关系

Figure 4. D-u_p relationship of LiF single crystal

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图 5 LiF单晶的折射率与密度的变化关系

Figure 5. LiF refractive index vs. density

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图 6 1 550 nm波长下LiF单晶窗口速度的修正关系

Figure 6. Window correction of LiF single crystal at 1 550 nm

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表 1 相关材料的雨贡纽参数^[23]

Table 1. Hugoniot parameters of related materials^[23]

Materials	ρ₀/(g/cm³)	c₀/(km/s)	λ	p/(GPa)
HR2 steel	7.890	4.58	1.49	< 190
Ta	16.656	3.43	1.19	< 222
Al	2.703	5.35	1.34	< 108

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表 2 实验参数

Table 2. Experimental parameters

Shot	h/(mm)	Δt₁/(ns)	Δt₂/(ns)	Δt₃/(ns)	Δt₄/(ns)	Δt/(ns)
LF01	2.960±0.005	373.5	369.7	369.3	369.9	370.6±2.0
LF02	2.950±0.005	381.6	381.9	380.5	380.1	381.0±0.9
LF03	2.927±0.005	321.6	322.1	322.7	322.2	322.2±0.4
LF04	2.940±0.005	263.0	259.3	272.9	265.9	265.3±5.8

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表 3 实验结果

Table 3. Experimental results

Shot	w/(km/s)	u_p/(km/s)	D/(km/s)	u_a/(km/s)	p_H/(GPa)	n_H	Δu/(km/s)
LF01	2.744±0.003	1.885±0.006	7.987±0.045	2.374±0.006	39.7±0.3	1.420 8±0.001 7	0.489±0.008
LF02	2.736±0.003	1.895±0.005	7.743±0.022	2.393±0.003	38.7±0.2	1.421 6±0.001 3	0.498±0.006
LF03	4.196±0.004	2.868±0.010	9.084±0.064	3.661±0.004	68.7±0.5	1.431 7±0.002 4	0.793±0.011
LF04	5.672±0.006	4.243±0.041	11.082±0.243	5.366±0.017	124.0±3.0	1.455 9±0.009 4	1.123±0.044

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