Acoustic detection identifies IEDs
Anew acoustic detection system, consisting of a phased acoustic array that focuses an intense sonic beam at a suspected improvised explosive device, can determine the difference between those that contain low-yield and high-yield explosives. remote acoustic detection system designed to identify homemade bombs can determine the difference between those that contain low-yield and high-yield explosives.
That capability, never before reported in a remote bomb detection system, was described in a paper by Vanderbilt engineer Douglas Adams presented at the American Society of Mechanical Engineers Dynamic Systems and Control Conference on October 23, in Stanford, California.
A Vanderbilt University release reports that a number of different tools are currently used for explosives detection. These range from dogs and honeybees to mass spectrometry, gas chromatography, and specially designed X-ray machines.
“Existing methods require you to get quite close to the suspicious object,” said Adams, Distinguished Professor of Civil and Environmental Engineering. “The idea behind our project is to develop a system that will work from a distance to provide an additional degree of safety.”
The new system consists of a phased acoustic array that focuses an intense sonic beam at a suspected improvised explosive device. At the same time, an instrument called a laser vibrometer is aimed at the object’s casing and records how the casing is vibrating in response. The nature of the vibrations can reveal a great deal about what is inside the container. and Gendarmerie as well as by Scotland Yard and the FBI. It has led to a publication in Forensic Science International and a patent has been filed.
ACNRS release reports that scientific police can find it difficult, however, to make use of such fingerprints when they are too light or their contrast is too low. When someone places their finger on an object, they leave behind a trace composed of water, salts, fats, amino acids and, potentially, DNA. To reveal this latent trace, the most widely employed technique is fuming of a cyanoacrylate compound, better known as “Super Glue.” This reacts with the elements present in the fingerprint and polymerises, leaving a white deposit that technicians can then photograph and analyse. This technique, however, can at times entail certain difficulties. For example, when the fingerprint support is of light colour, the contrast with the fingerprint is too low to be photographed. Similarly, if the fingerprint is very light, the deposit will be too tenuous to obtain an exploitable image.
The release notes that Lumicyano offers excellent detection performance. In addition, it reduces costs and treatment times. Another advantage is that it does not destroy the DNA that can sometimes be extracted from fingerprints. Its operational efficiency has been successfully tested and validated, not just by the French Police and Gendarmerie but also by several other police forces throughout the world such as Scotland Yard and the FBI.