为了对一种新型低感熔铸炸药(DNAN)含量进行检测, 设计了THz光谱相干探测系统, 检测确定了DNAN的THz特征波长位置, 又利用比尔朗伯定律求解了DNAN的含量。 设计了由主控系统控制步进电机实现光电探测器微扫描的时间相干THz光谱检测系统, 计算推导了DNAN含量求解需要的系统参数, 获得了DNAN的THz特征光谱。 实验采用三种方法分别对不同DNAN含量的爆炸物样品进行检测, 结果显示, 该系统精度接近目前广泛应用的THz光谱检测设备MINI-Z太赫兹光谱仪。 在此基础上, 设计了特征吸收峰优化算法, 通过Origin软件仿真分析可知, 该算法可以进一步提高系统的探测精度及稳定性。

In order to detect the content of a new kind of insensitive melting-cast explosive (DNAN), the system detected the THz characteristics wavelength of DNAN, and solved the content of DNAN by the Bill-Lambert law. Time coherent THz spectroscopy detection system was designed, in which the master system controlled stepper motor to get the micro-scanning of the photoelectric detector. The system parameters were calculated and derived for solving the content of DNAN, and THz characteristic spectrum of DNAN was obtained. Experiment used three methods to detect explosives samples with different content of DNAN, and the results show that the accuracy of this system is close to that of MINI-Z terahertz spectrometer currently broadly applied in THz spectroscopy detection equipment at home and abroad. On this basis, the optimization algorithm of characteristic absorption peak was designed, and by the origin software simulation analysis, it shows that the algorithm can further improve accuracy and stability of the detection system.