基于核四极共振技术的邮件爆炸物检测系统  

The System of Mail Explosive Detection Based on NQR

作　　者：何高魁[1] 宛玉晴[1] 田华阳[1] 金余恒[1] 黄小健[1] 刘洋[1] 

机构地区：[1]中国原子能科学研究院,北京102413

出　　处：《核电子学与探测技术》2012年第4期429-432,共4页Nuclear Electronics & Detection Technology

摘　　要：介绍了基于核四极矩共振(Nuclear Quadrapole Resonance,简称NQR)的爆炸物探测技术的原理和方法,并详细介绍了基于NQR技术的邮件爆炸物检测系统。该系统采用了直接数字合成技术定制激发脉冲序列,激发脉冲的相位、幅度和频率可实现程序精确控制。系统中采用了自动调谐技术保证探头只对感兴趣的频率点灵敏,集成了温度-频率关系曲线使得系统能够根据被测样品的温度自动修正激发频率。同时,在数据处理中引入加权算法抑制噪声干扰,提高了探测准确度。A system of mail explosive detection based on Nuclear Quadrupole Resonance （NQR） is introduced. Using direct data synthesis （DDS） to customize stimulation pulse sequence, the phase, amplitude and frequency of stimulation pulse can be controlled accurately by the computer. An automatic tuning technique is used to enable the detector to be only sensitive to the interesting frequency point. The temperature - frequency regulation function is also integrated in the system to modify stimulating frequency according to the temperature of sample. The system adopts a variable weighting data processing algorithm to suppress interference and so as to increase its signal to noise ratio.

关 键 词：核四极共振(NQR) 爆炸物检测 傅立叶变换 邮件 

分 类 号：TL81[核科学技术—核技术及应用]