Enhanced RDX Detection Studies on Various Types of Substrates via Tunable Quantum Cascade Laser Spectrometer Coupled with Grazing Angle Probe
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Fecha
2019
Autores
Ruiz-Caballero, J L
Blanco-Riveiro, L A
Ramirez-Marrero, I A
Perez- Almodovar, L A
Colon-Mercado, A M
Castro-Suarez, J R
Pacheco- Londoño, L C
Hernandez-Rivera, S P
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IOP Publishing
Resumen
Owing to scientific advances in the field of materials sciences and engineering,
researchers have developed new energy sources used for spectroscopic applications and
measurements of properties resulting from the interaction of matter and electromagnetic
radiation in the mid-infrared (MIR) region. MIR lasers, such as quantum cascade lasers (QCLs),
used for spectroscopy have quickly found numerous applications in a wide cadre of IR
techniques. This provides the opportunity to study properties of highly energetic materials
(HEM), among many other applications. MIR laser spectroscopy based detection experiments of
HEMs were carried out using a QCL optically coupled to compact grazing angle probe mount
(QCL-GAP) enabling reflection-absorption infrared spectroscopy (RAIRS) measurements of
thin films of HEMs. A saturated solution of RDX in acetone was prepared, and aliquots of
subsequent dilutions of the stock solutions were transferred to test surfaces for QCL-GAP backreflectance
measurements. RDX reflectance signals were monitored as function as the decreasing
surface concentration until the signal/noise was ~ 3. Stainless steel (SS) plates were used as
reflective substrates, and anodized aluminum (AN-Al), cardboard, and Teflon were used as nonreflective
(matte) substrates. Using generated calibration curves a low limit of detection (LOD)
of 1.7 ng/cm2 for RDX/SS and 95 μg/cm2 for RDX/AN-Al were found. Based on the area of
laser spot (0.3 cm2) we conclude the minimum masses detected were 490 pg (RDX/SS) and 28
μg (RDX/AN-Al)