采用具有高空间分辨本领的Fresnel波带板编码成象技术对爆推靶内爆区发射的α粒子进行成象 ,在最近的“神光Ⅱ”(SG Ⅱ )上实验中获得了爆推靶内爆区的空间分布、大小、压缩比等重要信息 .Fresnel波带板编码成象技术的空间分辨率好于 10 μm .实验测得内爆区大小约为初始靶直径的 1 3— 1 6 ,而内爆区的半高宽约为初始靶直径的 1 5— 1 9.由内爆区尺寸估算出的中子产额在误差范围内与实验结果相符 The Fresnel zone plate imaging technique with high spatial resolving power was used to image the α particles emitted by the explosive detonation target inner zone. In the recent experiment on SG Ⅱ, the explosive target was obtained The spatial distribution, size, compression ratio and other important information of the implosion zone.The spatial resolution of Fresnel zone plate imaging imaging technique is better than 10 μm.The experimental results show that the size of the implosion zone is about 1 3 -1 6 , While the full width at half maximum of the implosion zone is 1 5 -1 9 of the initial target diameter. The neutron yield estimated from the size of the implosion zone is in agreement with the experimental results