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实现对UXO的有效探测对保障战时己方人员安全与装备机动,以及战后人民生命财产安全和地区经济发展都具有重要的意义。目前,我国在UXO探测领域,方法理论研究方面,存在基础相对较薄弱、相关文献很少的问题;探测仪器方面,存在传感器灵敏度低(不能分辨小型航弹产生的微弱异常场)、信号提取手段落后的问题。针对这些问题,通过采用磁梯度探测方法、高精度Overhauser传感器来提高UXO探测灵敏度。首先,建立了适合航弹磁法探测的三度体的圆柱体模型,并对航弹的ΔT磁异常和垂直磁梯度异常进行了数值模拟和比较;然后,进行了背景磁场干扰和物理模型实验,验证了磁梯度法的可行性和优势;在此基础上,研究了动态核极化效应、自由基物质、Larmor信号的处理和抗干扰设计,并最终研制了基于动态核极化效应的Overhauser传感器及样机,在人工磁场发生空间中的测试结果表明其不确定度和国外主流传感器一致,均为0.3 nT。最后,在野外进行了对25 kg航弹的探测实验,测试结果表明其极限探测距离可以达到2.5 m,优于国产现役的探测器。
The effective detection of UXO is of great significance to the protection of personal safety and equipment maneuver in the wartime as well as the safety of life and property and the development of the regional economy after the war. At present, there are some problems in the field of UXO detection, such as methodological research, which are relatively weak in foundation and few related literatures. As for the detection instruments, there are some problems such as low sensitivity of the sensor (weak anomalous field caused by small aircrafts), signal extraction Outdated problem. In response to these problems, UXO detection sensitivity is improved by using a magnetic gradient detection method and a high accuracy Overhauser sensor. Firstly, a three-dimensional cylindrical model is established, which is suitable for airborne magnetic detection and numerical simulation and comparison of the ΔT magnetic anomalies and vertical magnetic gradient anomalies. Secondly, background magnetic field interference and physical model experiments , Verify the feasibility and advantage of the magnetic gradient method; On this basis, the study of the dynamic nuclear polarization effect, the radical material, Larmor signal processing and anti-jamming design, and finally based on the dynamic nuclear polarization effect of Overhauser The test results of sensor and prototype in artificial magnetic field show that the uncertainty is the same as that of foreign mainstream sensors, which are both 0.3 nT. Finally, a field test of 25 kg bomb was conducted. The test results show that the limit detection range can reach 2.5 m, which is better than that of domestic active detectors.