Mass Spectrometric Forensics of Explosives Using a Remotely Piloted Small Helicopter

摘要

Introduction Mass spectrometry is often used to investigate explosives, both in unexploded and post - exploded forms. This paper investigates the application of a small, remotely piloted helicopter to collect explosive gas for mass spectral (MS) analysis. The unmanned air vehicle (UAV) system was used to safely sample and detect leaks of propane gas, but the method might be applied to other hazardous gases. Objective The specific objective of this study was to determine if a small helicopter could be used to sample an explosive concentration of gas for analysis by mass spectrometry. We further wished to determine if the explosive hazard was caused by either an accidental release of gaseous hydrocarbons or by intentional use of high explosives such as TXT, RDX, PENT etc.. Background One recent case investigated by the federal government was the Herrig Brothers Poultry Farm propane explosion that occurred in Albert City, Iowa, on the morning of April 8, 1998. In the investigation report (1), the explosion was determined to be the result of a propane leak. The normal method of monitoring of propane leaks after explosion poses a safety risk when done by hand. Using this case as the working model, we set forth to determine if the RC helicopter system will allow safe, remote monitoring of propane leaks, and use mass spectrometry to confirm the results.