高速微粒子场的全息诊断技术

本文用全息摄影方法研究了爆炸产物阵面上微粒子场。据高速摄影测试结果表明,产物阵面微粒子约以5000米/秒的速度飞散。着重讨论了全息摄影允许的微粒子运动速度与其它参数关系的计算公式,同轴全息和离轴全息的特点和适应范围以及如何用空间滤波技术获得高分辨率的微粒子图象。

TECHNIQUE OF HOLOGRAPHIC DIAGNOSTICS OF HIGH SPEED MICROPARTICLE FIELD

In this paper we in detail discussed some subjects related to holographic diagnostics of microparticle field. For high speed Hying microparticles of wave-front producted by detonator exploding, the hologram picture is taken clearly. The distance is 8m from detonator to hologram. with the results of high speed photographic testing, it’s estimated that the microparticles velocity of wave-front is 5000m/sec. If microparticlcs move as the parallel direction with holographic film, the angle φ between forwad scatteringlight of microparticles and collimator illumination light is about 0°. Depending on the principle of holographic interferoment, maximum moving speed of microparticles permitted is below v_max <√10λD/(10T). where λ-wave length, T-width of pulsed laser, D-the distance from object (or it’s image) to holographic fllm-The results of testing have shown that the equation mention-ed above is suitable for use.In this paper the character and using range of in-line holography and off-axis holo-graphy are discussed. Using spatial filter technology, we can eliminate the stronger back-ground noise of holographic reconstruction. As the result, the background is dark, and the reconstruction of microparticles can be seen brightly.