Time Precision Synchronization in Simultaneous Measurement of Dynamic Emissivity and Radiance
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摘要: 分析了轻气炮实验中飞片速度漂移带来的冲击波到达样品/窗口界面时刻漂移问题、主要影响因素以及动态发射率与辐射亮度同时测量实验中的时序要求，采用镀膜光纤探针作为同时测量实验中动态发射率测量照明光源的触发装置，设计了光纤探针-样品之间的距离，并对设计余量进行了简单分析，解决了同时测量实验中的时间精确同步问题。在2发动态考核实验中，设计的飞片速度为4.1 km/s，实测飞片速度漂移量分别为70和210 m/s，动态发射率测量信号按照实验预期叠加在了样品/窗口界面热辐射信号平台之上，时序控制能够满足动态发射率与辐射亮度同时测量实验中的时间精确同步要求。Abstract: In this paper we analyzed the shock wave breakout time shift at the sample/window due to the flyer velocity shift and the time sequence relationship in the simultaneous measurement of the dynamic emissivity and the radiance.Then, we designed the fiber pins with a total reflection coating film at their edges to trigger the illumination pulse laser.The distance between the fiber pins and the sample was designed elaborately and the design residue was analyzed briefly.In the tests of two shots, the expected flyer velocity was 4.1 km/s and the measured velocity shift of the flyer was 70 m/s and 210 m/s respectively, but the dynamic emissivity signals were successfully superimposed on the thermal radiation of the sample/window interface at the time expected, and the time sequence controlling satisfied the demand of the simultaneous measurement experiments.
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Key words:
- dynamic emissivity /
- radiance /
- simultaneous measurement /
- time precision synchronization
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图 1 动态发射率与辐射亮度同时测量的原理示意图
Figure 1. Schematic of simultaneous measurement of dynamic emissivity and radiance
图 2 动态发射率与辐射亮度同时测量实验光路示意图
Figure 2. Experimental layout of simultaneous measurement of dynamic emissivity and radiance
图 4 OBB弹速测量结果(a)和镀膜光纤探针输出信号(b)
Figure 4. Velocity measurement of OBB system (a) and output signal of two coating fiber pins (b)
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