Siam Physics Congress 2015

The Determination of the Area of Origin in Medium Velocity Blood Spatters: Numerical Methods Approach

21 May 2015, 08:00

3h

Board: BIO-01

Poster presentation Biological Physics and Biomedical Engineering Poster-2

Speaker

Mr Chalermwat PINNOI (Department of Physics, Faculty of Science, Mahidol University, Bangkok, THAILAND 10400)

Description

In crime scene reconstruction, the patterns of bloodstains serve us opportunities to determine the location of bloods source which can be referred to the position of victim or weapon used. For medium velocity blood spatters, generally the victim is hit by a blunt object (such as a hammer or a baseball bat). The trajectories of blood drops are in projectile motions. In this work, the projectile motion of blood drops with the effect of air resistance was considered. The trajectories are recreated by solving the equation of projectile motion of projectile motion and using the numerical method, Runge-Khutta 4th order, in time reversal procedure. The area of origin could be obtained by creating the trajectories of all selected bloodstains. The numerical results give a good approximation to locate the area of origin of bloodstains with acceptable errors.