Abstract
The aim of this study was to design a device for explosives detection. The study design is based on excited steady-state luminescence quenching registration. Sensor's material luminescence intensity reduction occurs due to an interaction of explosives vapours contained in the air. The decrease rate of the luminescence intensity indicates the concentration of vapours. To study the luminescent properties of the sensor element, its luminescence spectra excited by photons with energies in the range 280 - 425 nm were measured. The excitation photoluminescence spectra for luminescence bands of the sensor element were also measured. Excitation source was light emitting diode (375 nm) and luminescent signal receiver was a photodiode (430 - 650 nm) in device designed. The device is operated under control of a program. The algorithm provides multiple operating modes (configuration, calibration, measurement etc.). Thus this device is referred to the class of devices with increased sensitivity to the explosives vapors. The advantages of device are autonomic power, small weight and sizes, simplicity of device operation for measurements.
Highlights
The luminescent properties of various compounds are widely utilized in chemical, biological, and medical engineering due to high sensitivity and unique opportunities to study molecules’ excited states, photochemical reactions, dynamics of fast molecular processes, as well as structure and properties of complex chemical and biological objects.Fluorescence quenching is a process that reduces the induced light flow intensity
Several processes can lead to this phenomenon, including reactions in excited state, energy transport, the formation of complexes at quencher molecules collisions with fluorescent substance molecules
During interaction with flourescent molecule-sensor the analyzed molecule reduces the intensity of light. This phenomenon is obeyed by the law, known as Stern-Volmer equation, which is a mathematical description of fluorescence quenching phenomenon [5]: where: I0 - luminescence intensity in theabsence of analyzed substance; I - luminescence intensity in the presence of analyzed substance; [Q] - substance concentration (I depends on it); doi:10.1088/1742-6596/552/1/012034
Summary
Journal of Physics: Conference Series 552 (2014) 012034 doi:10.1088/1742-6596/552/1/012034. Portable device for the detection of nitro-explosives based on optical properties of sensor’s material. A A Baranova, K O Khokhlov* Ural Federal University named after the first President of Russia Boris Yeltsin, Yekaterinburg, Russia
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