Do impact spatters depend on impact velocity, impact energy or impactor shape?

Abstract

This experimental study investigates the parameters controlling the spatial distribution and size distribution of blood spatter stains. An experimental setup consisting of two cylinders colliding along their main axes is used to produce spatter patterns, under conditions where the impact velocity and kinetic energy of the impact are independently controlled. The resulting spatter patterns are scanned and made available as digital images. Characteristic distributions of stain sizes and stain positions, as well as the number of stains, are measured. The influence of the velocity and kinetic energy of the impact, as well as the shape of the impactor, is quantified and interpreted. An energy analysis is performed and provides a criterion based on dimensionless parameters to determine which impact conditions influence the spatter pattern. High-resolution images of the 19 spatter patterns produced during the study are made available in an open-access repository.

Switch-on near infrared emission in albumin behind dark fabric: toward application in forensic latent bloodstain detection

“…This imaging depth is relevant in the field of forensic imaging considering the distance that blood travels during fabric wicking. 52,53 The dye–albumin complex emission lies in a unique forensic imaging window that enables inexpensive imaging with a silicon-photodetector-based camera behind dark fabric. To our knowledge, SO3C7 is unique in emitting in this forensic imaging window and displaying the switch-on/off and SNR properties described herein (Table S2†).…”