Improvements to the Witness Pack Analysis System (WPAS); Increasing the Accuracy of Hole Area
Abstract
The recording, analysis and characterisation of Behind-Armour (BA) debris are of major concern for the defence research community. In order to quickly and efficiently analyse witness packs, the Defence Research Establishment Valcartier has been developing over the past few years the WPAS(Witness Pack Analysis System). The main work performed by this systems consists of semi-automated computation of hole count, hole position; and hole area assessment from each plate of a witness pack. However even with the high accuracy in hole area assessment obtained with a high resolution digital camera, important errors (up to 80 %) appear for small or non-circular holes. This memorandum presents a simple and efficient method of improving hole area assessment of witness plates. This method can be applied to correct the assessment of witness plates already analysed and for future analysis. The methods consists in defining of an equation to represent the absolute error based on ;the hole area, using calibration plate data and applying it to all witness plates. An error inferior to +/-10 % is now obtained for all holes ranging from 0.0005 to 20 sq cm. in area.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 2001
- Accession Number
- ADB272174
Entities
People
- M. Szymczak
- Y. Baillargeon