Time filter

Source Type

Montigny-le-Bretonneux, France

Bernascolle P.F.,Bertin Technologies
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2013

All the manufacturers of stand-off CWA detectors communicate on the "same" characteristics. And one can find these parameters in the comparison table published between all the different products [1]. These characteristics are for example the maximum detection range, the number of different detectable compounds, the weight, the price, etc... All these parameters are good to compare products between them, but they omit one very important point: The reaction time in case of an unexpected incoming chemical threat, in the case of the surveillance application. To answer this important question, we imagine a new parameter: The Field Surface Scanning Rate (FSSR). This value is a classical parameter in astronomical survey, use by astronomers to compare the performance of different telescopes, they compute the quantity of sky (in sky square degrees) analyzed per unit of time by the system. In this paper we will compare this new figure-of-merit, the FSSR, of some commercially off the shelf stand-off detector. The comparison between classical FTIR system and gas imaging system in term of FSSR will be presented. ©2013 SPIE. Source

Naranjo E.,General Monitors | Baliga S.,General Monitors | Bernascolle P.,Bertin Technologies
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2010

Uncooled thermal cameras using microbolometer focal plane arrays may be used in the long wave infrared (LWIR) for the optical detection of hydrocarbon gas leaks. The strong absorption of hydrocarbon gases in the LWIR may be used to advantage along with the LWIR optical transmission window of the atmosphere. Improvements in the detection algorithm and more robust electronic hardware have produced a gas imager that is well adapted to the detection of large hydrocarbon leaks. The new imaging system relies on a single set of filters to identify a growing list of gases, up to four of them simultaneously. The new detection algorithm reduces the incidence of false alarms by masking portions of the field of view. Because of the camera's long detection range (2 km) and wide field of view, the system is particularly suitable for the supervision of large industrial zones. Results from a field test of leaking gas at a refinery and natural gas processing facility are presented. © 2010 Copyright SPIE - The International Society for Optical Engineering. Source

Le Bras F.,Directorate General of Armaments | Hamel T.,University of Nice Sophia Antipolis | Mahony R.,University of Canberra | Treil A.,Bertin Technologies
International Journal of Robust and Nonlinear Control | Year: 2011

This paper considers the question of stabilizing vertical take-off and landing (VTOL) unmanned aerial vehicles (UAVs) using a minimal and an inexpensive sensor suite. The sensor suite considered consists of rate gyros and a single embedded video camera system. The approach taken is based on the principles of dynamic image-based visual servo control and extends the authors' earlier work by removing dependence on additional sensors, such as accelerometers and magnetometers. The technique presented has potential for mini-UAVs evolving in urban areas where global positioning system signals may not be available. The control algorithms and coupled state observers are presented in details. The main result of the paper is synthesized in a theorem along with a rigorous stability analysis of the closed-loop system. An estimate of the basin of attraction for the closed-loop system is provided. Simulation results are performed to illustrate the performance of the proposed control. Copyright © 2010 John Wiley & Sons, Ltd. Source

Villaren T.,Telecom Bretagne | Coppin G.,Telecom Bretagne | Leal A.,Bertin Technologies
EICS'12 - Proceedings of the 2012 ACM SIGCHI Symposium on Engineering Interactive Computing Systems | Year: 2012

In complex systems such as cockpits or unmanned systems, operators manage a set of tasks with high temporal dynamics. Frequent changes of situation within the same mission can sometimes induce a loss of operators' Situation Awareness. In this paper, we introduce a methodology for design of Human-Computer Interfaces in dynamic systems taking into account the situation elements constituting operators' activity. We follow a user-centered approach; end-users and domain experts are included along the different steps of this model-based design process. The complete methodology is presented here, from initial task & situation modeling, through transition analysis, to the final recommendations on interface design, applied to an illustrative example. Copyright 2012 ACM. Source

Bertin Technologies | Date: 2013-11-20

A detector device for optically detecting a gas in a zone of space under observation, the device comprising a camera and means for continuously detecting at least one gas in the observed zone by analyzing absorbance in a plurality of different spectral bands. The device further comprises a matrix of micromirrors that are individually steerable between at least two positions, in a first of which they reflect the radiant flux coming from the observed zone to the camera for detecting gas in said spectral bands, and in a second of which they reflect the radiant flux coming from the observed zone to a Fourier transform infrared spectroscope.

Discover hidden collaborations