Portable Explosive Traces Detector MO-2DT

Application

The MO-2DT portable explosive detector is designed for a broad range of security applications: checking people and their belongings in mass transit systems (air, sea, road and rail transportation), industrial sites, corporate offices and residential buildings, as well as checking mails, package and cargo.

The MO-2DT detector is designed to detect particles of explosives that are collected on sampling swipes from objects of interest during their inspection.

When MO-2DT detects the presence of explosives, it generates sound and visual alarms. Detailed information is displayed on the detector’s LCD screen; this information can also be displayed on an external computer linked to the detector.

Principle of operation

The MO-2DT is a portable desktop detector that consists of several main elements integrated in its housing: the evaporation chamber, the gas track, the analysis and control modules, and the LCD for visualization. The paper swipe used to collect residues from the surface of the object being inspected is introduced into the evaporation chamber. This initiates the process to detect the presence of explosives: the chamber is heated to evaporate the particles of explosives, and the airflow around the swipe carries the vapors into the analysis module.

The analysis module of the MO-2DT detector utilizes a unique technology that is based on the principle of non-linear dependence of ion mobility on the electric field. This technology makes it possible to create a compact and lightweight, but yet very sensitive instrument capable of detecting the presence of explosives in quantities as small as 100 picograms.

A small low energy X-ray source located at the inlet of the gas track is used to ionize the airflow. The resulting ions are then separated by being subjected to electric fields with specific waveforms that combine high frequency AC at high voltage with a low voltage DC component. The alternative fields create a drift (condition of selection or mobility) that is specific to each type of ions. By applying the proper bias voltage to compensate for the drift of a type of ions, one can control that only those ions reach the detector's collector, creating a measurable ionic current. Other ions for which the selection conditions are not met recombine at the wall of the analytical module.

Selected types of ions collected on the collector correspond to specific explosives vapor; their ionic current is then amplified, recorded and processed to generate the alarm message for the corresponding explosive vapor.

The MO-2DT detector is equipped with a built-in air preparation system, as well as an auto-calibration system that continuously tunes the parameters of the analytical unit with the environmental conditions.

After a detection of explosives, the detector automatically initiates a rapid cleaning cycle of the evaporation chamber as soon as the swipe is extracted from the detector.

To avoid contamination of the detector by explosives contained on the swipe, heating of the evaporation chamber is automatically stopped during the process of analysis if the detection signal indicates too high a concentration of explosive.

The measurement results can be stored in the internal memory of the MO-2DT detector; then the data can be sent in real time to an external computer or downloaded after completion of the operations. The connection between MO-2DT and an external computer is made via a USB cable.

Main features

The MO-2DT detector does not contain radioactive material and does not require any special carrier gas.

The MO-2DT detector can operate in 2 different modes: "laboratory" and "field". The heating procedure programmed for the evaporation chamber is specific to each mode. The consumables (swipes) used are also specific to each mode of operation.

The "laboratory" mode is used for testing and for applications (forensics, special investigation) requiring a high sensitivity (400 – 10 000 picograms). In this mode, only specially prepared sampling grids and swipes should be used.

In the "field" mode, the sensitivity of the detector is set at a lower level. In that mode, swipes made of standard paper for printers, copiers and other "office" applications can be used for the sampling.

Operating the detector in "laboratory" mode (high sensitivity) under field conditions is not recommended for security operations. Experiments and calculations show that a sensitivity of 100 nanograms is quite sufficient to reliably detect explosives particles in field conditions.

Technical characteristics

Analytical principle: Non-Linear Dependence of ion mobility on the electric field (NLDM)
Response time: Less than 12 seconds
Threshold of sensitivity to TNT: For "laboratory” mode - about 400 picograms
For "field” mode - about 20 nanograms
Detectable explosives: Trinitrotoluol (TNT), cyclotrimetilentrinitroamin (hexogen), pentaeritrittetranitrat (PETN), nitroglycerin, tetryl and explosives based on them
Readiness for operation after switching on (at 20 ° C): Less than 5 minutes
Alarm signals: LED, audible, text and graph (ionograms) on the detector’s LCD or on the computer
Internal memory: 800 ionograms with the results of analysis (up to 10 000 is possible)
Power supply: From mains 100-240 V (up to 24 hours per day) or
Built-in storage battery for emergency cases (up to 2 hours)
Weight: 6,9 kg
Power consumption: Less than 55 VA
Dimensions (without handle): 105x250x320 mm
Operating temperature: + 5°C ... + 45°C at relative humidity up to 80%


**These are the standard/draft specifications that can be customized as per the requirement of client.

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