How do you calculate the angle of impact of blood spatter?
To study impact angle, you will need to use trigonometry math skills. Use trigonometric functions to determine the impact angle for any given blood droplet. To determine the angle of impact, take the inverse sin (arcsine) of 0.5, which is 30 degrees.
What are the 3 things that blood spatter can tell us?
Pattern Analysis looks at the physical characteristics of the stain patterns including size, shape, distribution, overall appearance, location and surface texture where the stains are found. Analysts interpret what pattern types are present and what mechanisms may have caused them.
How does angle affect blood spatter?
A blood drop striking a smooth surface at a 90° angle will result in an almost circular stain; there is little elongation, and the spines and satellites are fairly evenly distributed around the outside of the drop. Below 75°, spines begin to become more prominent on the side of the spatter opposite the angle of impact.
How is the geometry of blood spatter determined?
1 Geometry of blood spatter. When drops of blood hit the floor at an angle, they produce elliptical stains, where their width-to-length ratio gives that impact angle. Traditionally practitioners of blood-pattern analysis trace a straight-line from the stain at the impact angle to reveal where the blood originated.
How are blood smears, drips and spatters created?
The traces include drips, smears and spatters, which are created when drops of blood radiate from the impact of a bullet or blunt instrument until they encounter a surface and stain it.
How is percolation theory used to analyze blood spatter?
Its analysis used percolation theory, which describes available paths through randomly arranged clusters. For both kinds of spatter, the researchers calculated the numbers, sizes and dynamical properties of the drops of blood generated by a bullet; then determined their trajectories under gravity and aerodynamic drag.
How tall is the launch height of blood spatter?
In a test that spattered a viscous blood substitute, the researchers used this approach to calculate the actual launch height of 88 cm to within 8%. For comparison, the linear trajectories overestimated the launch height by 100%.
