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Towards optoelectronic detection of explosives

Wojtas J., Stacewicz T., Bielecki Z., Rutecka B., Medrzycki R., Mikolajczyk J.

Opto-Electronics Review

2013

Vol. 21, No. 2

210-219

Detection of explosives is an important challenge for contemporary science and technology of security systems. We present an application of NOx sensors equipped with concentrator in searching of explosives. The sensors using CRDS with blue - violet diode lasers (410 nm) as well as with QCL lasers (5.26 µm and 4.53 µm) are described. The detection method is based either on reaction of the sensors to the nitrogen oxides emitted by explosives or to NOx produced during thermal decomposition of explosive vapours. For TNT, PETN, RDX, and HMX the detection limit better than 1 ng has been achieved.

Applying CEAS method to UV, VIS, and IR spectroscopy sensors

Wojtas J., Mikołajczyk J., Nowakowski M., Rutecka B., Medrzycki R., Bielecki Z.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2011

Vol. 59, nr 4

415-418

In the paper, several applications of Cavity Enhanced Absorption Spectroscopy (CEAS) for trace mater detection are described. NO2 sensor was constructed using this technique with blue-violet lasers (395–440 nm). The sensor sensitivity reaches the level of single ppb and it was applied in security portal. For detection of two gases at the same time, two-channel sensor was constructed. Used method allows a significant reduction in the cost of optoelectronic CEAS sensor designed to measure of concentrations of many gases simultaneously. Successful monitoring of N2O and NO in the air requires high precision mid-infrared spectroscopy. The constructed sensors are able to measure concentration at ppb level. These sensors might be used for monitoring of atmospheric purity as well as for detection of explosives.