Computing

A Better Liquid-Explosives Detector

(Page 2 of 2)

  • Friday, December 1, 2006
  • By Kevin Bullis

The ICx Nomadics detectors work by sensing minute amounts of vapor: a specially formulated film fluoresces under certain conditions. For peroxide detection, a film starts to glow when it comes in contact with the peroxide vapors. The film coats the inside of a glass tube, through which air is drawn. The glass walls of the tube guide light from the film to a light sensor, which registers changes in light intensity. (In the TNT sensor, TNT vapors encountering an already fluorescing film cause it to darken.)

The company is working with MIT professor of material sciences Yoel Fink to further improve the clarity of the detectors' signal by making it easier to distinguish from background noise. Fink, who has created hollow fibers that can guide light much better than the glass tubes currently used, has also incorporated light detectors directly into fibers. A device that combines these features could "offer a huge simplification in instrumentation, making these almost ubiquitous," Rose says. In the future, soldiers could carry fibers designed to detect a variety of substances. The company is also developing polymers for detecting a variety of toxic industrial chemicals. A bundle of fibers could be used to detect more than one substance at a time.

It remains unknown whether ICx Nomadics's liquid-explosives-detection technology will ultimately result in the federal government lifting restrictions on taking bottled water and other liquids through airport security. "That's up to the TSA," Kelly says.

Print

Related Articles

Portable Plastic Explosives Detector

An explosives detector that uses luminescent polymers is being field-tested in Iraq.

DNA-Based Artificial Nose

Single-stranded DNA can be used to identify explosives and other airborne compounds.

The Incapacitating Flashlight

An LED flashlight makes culprits vomit.

Close Comments

To comment, please sign in or register

Forgot my password

iddo

4 Comments

  • 1901 Days Ago
  • 12/02/2006

Detecting TATP explosives

This is not the first technology to be able to identify TATP - this article covers the subject in-depth:
http://www.tfot.info/content/view/92/

Reply

teknix

1 Comment

  • 1896 Days Ago
  • 12/07/2006

TATP in a short per. of time?

My question is how is someone going to go on a plane with strong smelling chemicals (acetone and HCl) and use these in a mix without someone noticing it, form TATP in a reasonable amount of time (usually takes 24 hours to form enough to do any damage), and then filter the solid from the liquid solution and dry it (usually takes another 24 hours) all in the few hours they are on a plane? Also if they say TATP that means it has to be formed at low temperature to obtain the tricyclo isomer so they are going to need an ice bath or refrigerator. If they do this reaction at room temperature it will form faster in a few hours but you are getting DADP which is a dicyclo isomer and much more unstable, but this still doesn’t change the fact that it needs dried before it can be used as an explosive.

Reply

Advertisement

MAGAZINE

Can We Build Tomorrow's Breakthroughs?

Manufacturing in the United States is in trouble. That's bad news not just for the country's economy but for the future of innovation.

Sponsored Content

Technologies from National Instruments

Adding Data Logging
Log measured data to a file and open it in Microsoft Excel

> Click here for more National Instruments Videos <
Whitepaper

Temperature Measurements with Thermocouples: How-To Guide

This document is part of the “How-To Guide for Most Common Measurements” centralized resource portal. This tutorial provides a detailed guide for measurement and device considerations to take temperature measurements using thermocouples. Get an introduction to thermocouples, which are inexpensive sensing devices widely used with PC-based data acquisition systems. Also review some specific thermocouple examples and learn how thermocouples work and ways to integrate them into a data acquisition measurement system.

View full PDF > Listen to story >
Find us on Youtube

Videos

A Robot Recruit that Can Do It All

More

Advertisement

Technology Review Lists

TR50

Our list of the 50 most innovative companies, including the following:

Netflix

Pacific Biosciences

Silver Spring Networks

Applied Materials

More

Advertisement

Facebook

Advertisement