基于NQR技术探测爆炸物实验中,为了使系统各个部分之间达到更好匹配效果从而提高NQR信号信噪比,需要每次探测之前,对系统进行调谐。传统的调谐方式,如采用手动或者步进电机进行调谐,要么调谐时间长,要么调谐精度有限,影响探测效率。为了实现自动调谐功能,同时从探测系统的空间和经费方面考虑,自动调谐的硬件大部分在原有的探测系统的硬件基础上进行,例如功放、激励信号源、屏蔽体等。与原有的系统相比,比较大 Based on the NQR technology to detect explosives, the system needs to be tuned before each probing in order to achieve better matching between the various parts of the system to improve the NQR signal to noise ratio. Traditional tuning methods, such as manual or stepper motor tuning, or tuning a long time, or tuning accuracy is limited, affecting the detection efficiency. In order to realize the automatic tuning function, the hardware of the automatic tuning is mostly based on the hardware of the original detection system, such as the power amplifier, the excitation signal source, the shielding body, and the like, in view of the space and funding of the detection system. Compared with the original system, relatively large