Raymond M A, Smith E R, Liesegang J
Victoria Forensic Science Centre, Macleod, Australia.
Sci Justice. 1996 Jul-Sep;36(3):161-71. doi: 10.1016/S1355-0306(96)72591-1.
Traditionally, the analysis of blood spatter on surfaces in the reconstruction of crime scenes relies on the assumption that blood droplets are spherical when they strike the surface. This paper explores the effects of their shape on the reconstruction of trajectories from their impact pattern, and reports a theoretical analysis of the lifetime of droplet oscillations. Oscillations damp quickly in blood droplets due to the viscosity. The analysis provides ranges of velocities and distances from the point of droplet projection within which it is unreliable to assume the droplets are spherical when they stain a surface. Non-spherical droplet stains predict incorrect positioning of the droplet projection point. Experimental data are presented to show that the estimates apply in practice.
传统上，在犯罪现场重建中对表面血迹的分析依赖于这样一种假设，即血滴撞击表面时是球形的。本文探讨了血滴形状对根据其撞击模式重建轨迹的影响，并报告了对液滴振荡寿命的理论分析。由于粘性，血滴中的振荡会迅速衰减。该分析给出了液滴投射点的速度和距离范围，在这个范围内，当液滴沾染表面时假设其为球形是不可靠的。非球形的液滴污渍会预测出液滴投射点的错误位置。文中给出的实验数据表明这些估计在实际中是适用的。
