Time filter

Source Type

Paradis P.-F.,Institute National dOptique INO | Ishikawa T.,Japan Aerospace Exploration Agency | Okada J.T.,Japan Aerospace Exploration Agency
Johnson Matthey Technology Review

This review briefl y describes the vacuum electrostatic levitation furnace developed by JAXA and the associated non-contact techniques used to measure the density, the surface tension and the viscosity of materials. The paper then presents a summary of the data taken with this facility in the equilibrium liquid and non-equilibrium liquid phases for the six platinum group metals (pgms): platinum, palladium, rhodium, iridium, ruthenium and osmium over wide temperature ranges that include undercooled and superheated phases. The presented data (density, surface tension and viscosity of Pt, Rh, Ir, Ru and Os and density of Pd) are compared with literature values. © 2014 Johnson Matthey. Source

Libois Q.,University of Quebec at Montreal | Proulx C.,Institute National dOptique INO | Ivanescu L.,University of Quebec at Montreal | Coursol L.,University of Quebec at Montreal | And 5 more authors.
Atmospheric Measurement Techniques

A far infrared radiometer (FIRR) dedicated to measuring radiation emitted by clear and cloudy atmospheres was developed in the framework of the Thin Ice Clouds in Far InfraRed Experiment (TICFIRE) technology demonstration satellite project. The FIRR detector is an array of 80 × 60 uncooled microbolometers coated with gold black to enhance the absorptivity and responsivity. A filter wheel is used to select atmospheric radiation in nine spectral bands ranging from 8 to 50 m. Calibrated radiances are obtained using two well-calibrated blackbodies. Images are acquired at a frame rate of 120 Hz, and temporally averaged to reduce electronic noise. A complete measurement sequence takes about 120 s. With a field of view of 6°, the FIRR is not intended to be an imager. Hence spatial average is computed over 193 illuminated pixels to increase the signal-to-noise ratio and consequently the detector resolution. This results in an improvement by a factor of 5 compared to individual pixel measurements. Another threefold increase in resolution is obtained using 193 non-illuminated pixels to remove correlated electronic noise, leading an overall resolution of approximately 0.015 W m-2 sr-1. Laboratory measurements performed on well-known targets suggest an absolute accuracy close to 0.02 W m-2 sr-1, which ensures atmospheric radiance is retrieved with an accuracy better than 1 %. Preliminary in situ experiments performed from the ground in winter and in summer on clear and cloudy atmospheres are compared to radiative transfer simulations. They point out the FIRR ability to detect clouds and changes in relative humidity of a few percent in various atmospheric conditions, paving the way for the development of new algorithms dedicated to ice cloud characterization and water vapor retrieval. © Author(s) 2016. Source

Eiselen S.,Bayerisches Laserzentrum GmbH | Eiselen S.,Friedrich - Alexander - University, Erlangen - Nuremberg | Wu D.,Bayerisches Laserzentrum GmbH | Galarneau P.,Institute National dOptique INO | And 2 more authors.
Physics Procedia

New pulse shaping possibilities using pulsed lasers in the nanosecond range offer entirely new approaches at influence and investigate laser-matter- interactions. The authors report on the influence of the temporal energy input on ablation of metal using arbitrarily shaped infrared nanosecond laser pulses. The importance of a proper description of time-resolved energy input by using the accumulated energy is demonstrated in theoretical considerations as well as experimental investigations. The presented results clearly show that any averaging over pulse duration results in missing information about time-dependent interactions and can at the same time lead to significant differences in ablation results. © 2013 The Authors. Source

Institute National Doptique and Institute National Doptique Ino | Date: 2011-11-29

A solid or semi-solid polymer-based material that simulates the optical properties of biological tissues and can be made in various shapes, used as a reference sample in visible and near-infrared optical imaging, molecular imaging and light dose simulation for scientific and medical research use.

Jousselme A.-L.,Defense R and D Canada Valcartier | Boury-Brisset A.-C.,Defense R and D Canada Valcartier | Debaque B.,Institute National dOptique INO | Prevost D.,Institute National dOptique INO
FUSION 2014 - 17th International Conference on Information Fusion

Physical sensors (hard sources) and humans (soft sources) have complementary features in terms of perception, reasoning, memory. It is thus natural to combine their associated information for a wider coverage of the diversity of the available information and thus provide an enhanced situation awareness for the decision maker. While the fusion domain mainly considers (although not only) the processing and combination of information from hard sources, conciliating these two broad areas is gaining more and more interest in the domain of hard and soft fusion. In order to better understand the diversity and specificity of sources of information, we propose a functional model of a source of information, and a structured list of dimensions along which a source of information can be qualified. We illustrate some properties on a real data gathered from an experiment of light detection in a fog chamber involving both automatic and human detectors. © 2014 International Society of Information Fusion. Source

Discover hidden collaborations