Étude de diodes lasers pour des applications métrologiques de la rétro-injection optique PDF Download

Author: Gregory Mourat
Publisher:
ISBN:
Category :
Languages : fr
Pages : 167

View

Book Description
Le phénomène de "self-mixing" (interférences à deux ondes dans le milieu actif d'une diode laser) est utilisé pour des applications métrologiques telles que la mesure de distance, de déplacement ou de vitesse. Dans ces dispositifs, une diode laser émet un faisceau en direction d'une cible. Une partie de l'onde lumineuse est réfléchie en direction du laser et perturbe la puissance d'émission. L'information métrologique recherchée est alors déterminée en traitant ces variations de puissance. Dans la première partie (ch.I à III), les limitations intrinsèques des interférences par self-mixing dues à la source laser sont étudiées. La seconde partie (ch.IV à VI) a pour objectif de déterminer les critères prépondérants au choix de la source laser à utiliser pour chaque application métrologique du self-mixing.

Author: JEANNE-MARIE.. DESBANCS
Publisher:
ISBN:
Category :
Languages : fr
Pages : 200

View

Book Description
LE DOMAINE DES MESURES DE RAYONNEMENT OPTIQUE CONNAIT ACTUELLEMENT UNE EVOLUTION IMPORTANTE, MARQUEE PRINCIPALEMENT PAR UNE DEMANDE DE MESURES MONOCHROMATIQUES A HAUT NIVEAU DE PUISSANCE, AVEC UNE INCERTITUDE DE PLUS EN PLUS FAIBLE. LES DIODES LASERS, QUI EMETTENT UN RAYONNEMENT MONOCHROMATIQUE INTENSE DANS LE ROUGE ET LE PROCHE INFRA-ROUGE, SE PRESENTENT COMME DE NOUVELLES SOURCES INTERESSANTES POUR LA MISE EN UVRE DE DIVERSES MESURES RADIOMETRIQUES EN BANDE TRES ETROITE. LEUR UTILISATION NECESSITE NEANMOINS QUE LEUR STABILITE EN PUISSANCE SOIT ACCEPTABLE SUR DES DUREES SUFFISANTES POUR EFFECTUER DES MESURES PRECISES, QUE LEUR SPECTRE D'EMISSION SOIT PARFAITEMENT CONNU, ET QUE LA GEOMETRIE DE LEUR FAISCEAU SOIT COMPATIBLE AVEC LES BESOINS DE LA RADIOMETRIE. CES TROIS CRITERES ONT CONDUIT AU DEVELOPPEMENT DE DIFFERENTS SYSTEMES DE CARACTERISATION DU RAYONNEMENT EMIS PAR LES DIODES LASERS, POUR DETERMINER LEURS PERFORMANCES ET DEFINIR LEURS APTITUDES POUR DES APPLICATIONS METROLOGIQUES. AINSI, EN CHOISISSANT SOIGNEUSEMENT LEURS CONDITIONS DE FONCTIONNEMENT, LES DIODES LASERS PRESENTENT DES CARACTERISTIQUES DE MONOCHROMATICITE ET DE STABILITE EN PUISSANCE TOUT A FAIT SATISFAISANTES POUR DES USAGES RADIOMETRIQUES. PAR CONTRE, LA GEOMETRIE PARTICULIERE DU FAISCEAU N'ETANT PAS DIRECTEMENT UTILISABLE, DEUX METHODES D'ADAPTATION ONT ETE ENVISAGEES. L'UNE PERMET D'OBTENIR DES SOURCES LASERS COLLIMATEES TRES MONOCHROMATIQUES POUR L'ETUDE ET L'ETALONNAGE DES DETECTEURS DE RAYONNEMENT OPTIQUE. L'AUTRE ASSOCIE UNE DIODE LASER A UNE SPHERE INTEGRATRICE POUR OBTENIR UNE SOURCE LAMBERTIENNE UTILISABLE EN TANT QU'ETALON DE LUMINANCE MONOCHROMATIQUE

Author: Markku Vainio
Publisher:
ISBN: 9789512281008
Category :
Languages : en
Pages : 57

View

Book Description
Tiivistelmä: Optista takaisinkytkentää ja optista injektiota hyödyntävät diodilaserit : sovellukset metrologiassa.

Author: R. O. Adams
Publisher:
ISBN:
Category : Indium
Languages : en
Pages : 20

View

Book Description
The feasibility of using indium seals for large vacuum bell jars has been investigated. It is shown that such seals can be made; however, use of this type seal for repetitive operations is not recommended.

Author: Max Giordano
Publisher: John Wiley & Sons
ISBN: 1118587529
Category : Business & Economics
Languages : en
Pages : 389

View

Book Description
This book gives a comprehensive view of the most recent major international research in the field of tolerancing, and is an excellent resource for anyone interested in Computer Aided Tolerating. It is organized into 4 parts. Part 1 focuses on the more general problems of tolerance analysis and synthesis, for tolerancing in mechanical design and manufacturing processes. Part 2 specifically highlights the simulation of assembly with defects, and the influence of tolerances on the quality of the assembly. Part 3 deals with measurement aspects, and quality control throughout the life cycle. Different measurement technologies and methods for estimating uncertainty are considered. In Part 4, different aspects of tolerancing and their interactions are explored, from the definition of functional requirement to measurement processes in a PLM approach.

Author:
Publisher:
ISBN:
Category : Atomic beams
Languages : en
Pages : 180

View

Book Description

Author: J.A. Holtet
Publisher: Springer Science & Business Media
ISBN: 9400952953
Category : Science
Languages : en
Pages : 427

View

Book Description
These proceedings are based upon introductory talks, research reports and discussions from the NATO Advanced Workshop on the "Morphology and Dynamics of the Polar Cusp", held at Lillehammer, Norway, 7-12 May, 1984. The upper atmosphere at high latitudes is called the "Earth's win dow to outer space". Through various electrodynamic coupling process es as well as through direct transfer of particles many geophysical effects displayed there are direct manifestations of phenomena occurring in the deep space. The high latitude ionosphere will also exert a feedback on the regions of the magnetosphere and atmosphere to which it is coupled, acting as a momentum and energy source and sink, and a source of particles. Of particular interest are the sections of the near space known as the Polar Cusp. A vast portion of the earth's magnetic field envelope is electrically connected to these regions. This geometry results in a spatial mapping of the magnetospheric pro cesses and a focusing on to the ionosphere. In the Polar Cusps the solar wind plasma has also direct access to the upper atmosphere. The polar regions are thus of extreme importance when it comes to under standing the physical processes in the near space and their effect on our environment. The Introductory Talks given at this workshop provided a common background for discussing and understanding the physics of the Polar Cusp. By this book we will make the information which thus was provid ed to the participants of the workshop accessible to a wider audience.

Author: J. Robert Schrieffer
Publisher: CRC Press
ISBN: 0429964250
Category : Science
Languages : en
Pages : 352

View

Book Description
Theory of Superconductivity is primarily intended to serve as a background for reading the literature in which detailed applications of the microscopic theory of superconductivity are made to specific problems.

Author: Henry Baltes
Publisher: Wiley-VCH
ISBN:
Category : Science
Languages : en
Pages : 256

View

Book Description
Offers a review of current highlights in the field of sensors, and should be particularly useful for researchers planning to invest in new instrumentation. There is a section on sensor markets, providing an overview of suppliers and market trends for a particular sector.

Author: Ajitha Rajan
Publisher: Springer Science & Business Media
ISBN: 3709113873
Category : Technology & Engineering
Languages : en
Pages : 403

View

Book Description
The book summarizes the findings and contributions of the European ARTEMIS project, CESAR, for improving and enabling interoperability of methods, tools, and processes to meet the demands in embedded systems development across four domains - avionics, automotive, automation, and rail. The contributions give insight to an improved engineering and safety process life-cycle for the development of safety critical systems. They present new concept of engineering tools integration platform to improve the development of safety critical embedded systems and illustrate capacity of this framework for end-user instantiation to specific domain needs and processes. They also advance state-of-the-art in component-based development as well as component and system validation and verification, with tool support. And finally they describe industry relevant evaluated processes and methods especially designed for the embedded systems sector as well as easy adoptable common interoperability principles for software tool integration.