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NooEL - Nonlinear Optics and OptoElectronics Laboratory, Department of Engineering, University of Study "ROMA TRE", Via Vito Volterra 62, Rome and Italy
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2 Papers

A Sensor for the Optical Detection of Dangerous Road Condition

Topics: Photodetectors, Sensors and Imaging; Optical Materials and Devices; Light-Matter Interaction

Authors: Armando Piccardi and Lorenzo Colace

Affiliation: NooEL - Nonlinear Optics and OptoElectronics Laboratory, Department of Engineering, University of Study "ROMA TRE", Via Vito Volterra 62, Rome, Italy

Digital Object Identifier: 10.5220/0007572002830288

Proceedings of PHOTOPTICS 2019, ISBN: 978-989-758-364-3

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We present the design, realization and characterization of a sensor for the optical detection of hazardous road condition. The device exploits the radiation from a incoherent source to detect the polarized components of the light scattering from a rough surface and calculate a signal dependent on the surface state. We propose two distinct geometries, working with forward and backward scattering components, assessing the device performance in terms of reliability and compactness. In both cases, the sensor allows to discriminate potentially dangerous states like the presence of water (either wet surface or covered by a layer) or ice on an asphalt sample, in opposition to the dry surface representing a safe condition.

Lead Sulphide Colloidal Quantum Dots for Sensing Applications

Topic: Photodetectors, Sensors and Imaging

Authors: A. De Iacovo , C. Venettacci , S. Bruno and L. Colace

Affiliation: Department of Enginnering, University Roma Tre, Via Vito Volterra 62, Rome, Italy

Digital Object Identifier: 10.5220/0007444002350240

Proceedings of PHOTOPTICS 2019, ISBN: 978-989-758-364-3

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Colloidal Quantum Dots (CQD) have been widely studied for their peculiar optical characteristics such as enhanced optical absorption and tunable absorption spectrum. Many different photodetectors have been proposed but overall performance is still poor from the point of view of the bandwidth and noise performance. Here we propose the employment of a PbS QD photoconductor as an ultra-high sensitivity fire detector, exploiting the outstanding device responsivity at low optical powers. Moreover, we demonstrate the outstanding flexibility of CQD based devices, employing our detectors also as simple pollution gas sensors for NO2 detection.

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