Most artisans visually characterize Chiapas amber, mainly in appreciating the blue-green color emitted by fluorescence when incident ultraviolet light illuminates it. However, false amber pieces generate this coloration, misleading local and international buyers. Thus, we propose an optomechatronic device (OD) to determine whether amber from Chiapas is authentic. This device measures the fluorescence intensity and, through a database, determines whether amber is authentic. The infrared and ultraviolet spectroscopy techniques validated the results obtained with the OD.
We designed a cubic-phase gallium nitride (c-GaN) homojunction for ultraviolet-C (UVC) detection. A physical model approach was employed to design the dimensions of the detector and the doping concentrations of each layer. The calculated electrical and optoelectronic properties were employed to perform a simulation program with integrated circuit emphasis (SPICE) equivalent circuit model to integrate c-GaN photodetection capabilities into a CAD electronic simulator. The model allows estimating the transport properties in the darkness and under ultraviolet (UV) illumination conditions. Furthermore, the effect of depletion capacitance was taken into account thinking in the circuitry amplification stage. When a transient UVC flash occurs, the SPICE simulation revealed that the output signal is in the order of 300 μV, which is suitable to be amplified by a transimpedance amplifier.
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