拉曼光谱方法实现RDX药柱内部压力的无损检测

黑索金(RDX)是目前最为常用的军用炸药,随着新型战斗部的发展,异形的RDX药柱不断出现。为保证战斗部的作战效能,需要发展一种能够在线无损检测RDX药柱内部压力的方法。利用拉曼光谱测量表征RDX药柱的方法并结合第一性原理计算,确定了RDX的特征谱线,研究了拉曼特征谱线随外加压强的移动。在实验中分别测量了10,20和30MPa的样片,并通过15,25和35MPa的样片来验证拟合关系的偏差,发现RDX药柱的拉曼特征谱线的移动与外加压强的大小成很好的线性关系。这样就可以先在实验室标定RDX药柱拉曼特征谱线与外压强之间的线性关系,然后测量具有异形的RDX药柱的拉曼谱线,与标准样品的谱线比较得到谱线移动,根据标定得到的线性关系得到异形RDX药柱的内部压强,从而实现对黑索金内压的无损检测。实验表明该方法具有灵敏度高,一致性好的优点,目前该方法已经在某型战斗部的生产上进行试用。

Nondestructive Measurement of RDX Grain's Internal Pressure by Using Raman Spectrum Method

RDX is a most widely used military explosive.As the development of new warhead s,there are more and more applications of RDX with abnormal grain shapes.To ensure the operational effectiveness of the new warheads,it is necessary to fi nd an on-line nondestructive methods that can measure the RDX grain's internal pressure.In this paper,we use Raman spectrum and first-principles methods to determine the characteristic spectral line of the RDX samples and have studie d the shift of the Raman spectral lines under various pressures.In particular,we measured the RDX samples under the pressures of 10,20 and 30 MPa,respec tively,and checked the fitting errors by measuring the RDX samples under the p ressures of 15,25 and 35 MPa,respectively.It is found that the shift of th e characteristic Raman spectral line has a good linear dependence on the externa l pressures.Therefore,we can at first calibrate the linear relation between the shift of the Raman spectral line of regular RDX and the pressures in laborat ory and then measure the Raman spectral line shift of the RDX with abnormal shap es.Based on the calibrated linear relation and the measurement of Raman spectr a,one can determine the internal pressure in RDX.In this way,we can realiz e the nondestructive detection of the internal pressure of RDX.The experiment results show that this method has the advantage of good sensitivity and reproduc ibility.The Raman spectrum method has been successfully tested in the warhead production line.