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首页> 外文会议>Fiber Optic Sensors and Applications XII >Optimization of detonation velocity measurements using a Chirped Fiber Bragg Grating
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Optimization of detonation velocity measurements using a Chirped Fiber Bragg Grating

机译：使用a光纤布拉格光栅优化爆轰速度测量

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摘要

Dynamic measurements of detonation velocity profiles are performed using long Chirped Fiber Bragg Gratings (CFBGs). Such thin probes, with a diameter of typically 150 um, are inserted directly into a high explosive sample or simply positioned laterally. During the detonation, the width of the reflected optical spectrum is continuously reduced by the propagation of the wave-front, which physically shortens the CFBG. The reflected optical intensity delivers a ramp down signal type, which is directly related to the detonation velocity profile. Experimental detonation velocity measurements were performed on the side of three different high explosives (TNT, B2238 and V401) in a bare cylindrical stick configuration (diameter: 2 inches, height: 10 inches). The detonation velocity range covered was 6800 to 9000 m/s. The extraction of the detonation velocity profiles requires a careful calibration of the system and of the CFBG used. A calibration procedure was developed, with the support of optical simulations, to cancel out the optical spectrum distortions from the different optical components and to determine the wavelength-position transfer function of the CFBG in a reproducible way. The 40-mm long CFBGs were positioned within the second half of the three high explosive cylinders. The excellent linearity of the computed position-time diagram confirms that the detonation was established for the three high explosives. The fitted slopes of the position-time diagram give detonation velocity values which are in very good agreement with the classical measurements obtained from discrete electrical shorting pins.
机译：使用长Chi光纤布拉格光栅（CFBG）进行爆轰速度剖面的动态测量。将这种直径通常为150 um的细探针直接插入高爆炸性样品中，或简单地横向放置。在爆炸期间，反射光谱的宽度通过波前的传播而连续减小，这实际上缩短了CFBG。反射的光强度传递下降信号类型，该信号类型与爆轰速度曲线直接相关。在三种不同的高炸药（TNT，B2238和V401）侧面以裸露的圆柱状棍棒配置（直径：2英寸，高度：10英寸）进行了实验爆震速度测量。所覆盖的爆震速度范围为6800至9000 m / s。爆震速度曲线的提取需要对系统和所用CFBG进行仔细校准。在光学仿真的支持下，开发了一种校准程序，以消除来自不同光学组件的光谱畸变，并以可再现的方式确定CFBG的波长位置传递函数。 40毫米长的CFBG位于三个高爆炸药筒的后半部分。计算出的位置-时间图的出色线性证明了三种高爆炸药的起爆作用。位置-时间图的拟合斜率给出的爆震速度值与从分立的电气短路销获得的经典测量值非常吻合。

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