To investigate the response of fiber probe on explosion loading and the response char‐acter under impacting action ,the detonation experiments of the TNT‐RDX‐Al explosive and the composite B explosive were developed .The Φ0 .063 5 mm fiber probe with concentrating collimation convex in the front‐end and the Φ1 mm fiber probe without concentrating collima‐tion convex were adopted separately to determinate the transmission velocity of the chemical propagating reaction . Both of them could determine the detonation velocity of explosives~7 000 m/s and the uncertainty of measurement ≤2% .T he fiber reaction signals under shock were recorded using the fiber probe without concentrating collimation convex .And the“black‐body radiation” phenomenon was validated under the high temperature and high pressure pro‐duced by strong impact .%为研究光纤探针应用于炸药爆速测试的可行性及其在冲击作用下的响应特性，开展了梯黑铝（T HL ）炸药和混合B炸药爆轰实验、冲击作用下光纤响应实验。分别采用直径Φ0．0635 m m、前端带聚光准直凸透镜的玻璃光纤探针和直径Φ1 mm、前端不带聚光准直凸透镜的塑料光纤探针，测定爆轰过程化学反应阵面传播速度。结果表明：两者都能够准确测定约7000 m／s的炸药爆轰速度，测量不确定度≤2％。另外，采用直径Φ1 mm、前端不带聚光准直凸透镜的塑料光纤探针，记录强冲击波作用下光纤响应信号，验证了强冲击产生的高压高温作用下的“黑体辐射”现象。因此，光纤探针能够准确测定炸药爆轰速度，且在冲击作用下出现“色温”现象，即黑体“辐射现象”。
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