Download or read book Contribution l tude d un oscillateur quartz de tr s haute fr quence written by pascal Siffert and published by . This book was released on 1974 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: RAPPEL CONCERNANT LA MESURE DES INSTABILITES DE FREQUENCE D'UN OSCILLATEUR DANS LE DOMAINE TEMPOREL ET SPECTRAL, LE BRUIT ENGENDRE DANS LA BOUCLE OSCILLATRICE, LE BRUIT RAMENE PAR LES AMPLIFICATEURS DE SORTIE. ETUDE DU QUARTZ EN TANT QUE RESONATEUR. MISE EN EVIDENCE DES PROBLEMES POSES PAR LA TRES HAUTE FREQUENCE D'OSCILLATION (125 MHZ) ET SON EFFET SUR LE COEFFICIENT DE QUALITE. METHODES DE MESURE DANS LE DOMAINE TEMPOREL ET LE DOMAINE SPECTRAL. RESULTATS DE MESURE

Download or read book CONTRIBUTION A LA CONCEPTION D OSCILLATEURS A QUARTZ MINIATURISES DE HAUTE FREQUENCE PAR SIMULATION TEMPORELLE written by FREDERIC.. GRANSON and published by . This book was released on 1992 with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt: NOUS AVONS ETUDIE LA CONCEPTION D'UN OSCILLATEUR A QUARTZ MINIATURISE DANS LA GAMME DE FREQUENCE 100-500MHZ. POUR UN TEL OSCILLATEUR, L'UTILISATION D'UN RESONATEUR TOUT QUARTZ A ONDES DE SURFACE PERMET DE REALISER UN OSCILLATEUR AVEC UN VIEILLISSEMENT EXCEPTIONNEL. LA RECHERCHE DE LA MINIATURISATION DE L'OSCILLATEUR NOUS A CONDUIT A L'ETUDE A PARTIR DU LOGICIEL PSPICE DES PERFORMANCES EN FREQUENCE ET EN BRUIT DE TRANSISTORS BIPOLAIRES DE DIFFERENTS A.S.I.C. DU TYPE PREDIFFUSE. DES ECHANTILLONS DE CES CIRCUITS PREDIFFUSES DISPONIBLES EN KIT PARTS, NOUS A PERMIS DE COMPARER LES RESULTATS THEORIQUES DONNES PAR PSPICE AUX RESULTATS EXPERIMENTAUX ET DE VALIDER LES PERFORMANCES PREDICTEES PAR PSPICE. LA PERSONNALISATION D'UN CIRCUIT PREDIFFUSE PASSE PAR LA REALISATION D'UN MASQUE QUI REALISE LES INTERCONNEXIONS ENTRE LES DIFFERENTS ELEMENTS DU CIRCUIT. POUR PRENDRE EN COMPTE L'INFLUENCE DE CES LIGNES D'INTERCONNEXION SUR LES PERFORMANCES DU CIRCUIT, NOUS AVONS DEVELOPPE UN PROGRAMME QUI DETERMINE LES PARAMETRES ELECTRIQUES DU SCHEMA EQUIVALENT A PARTIR DES DONNEES GEOMETRIQUES DE LA LIGNE. LES RESULTATS OBTENUS METTENT EN EVIDENCE LA POSSIBILITE DE REALISER UN OSCILLATEUR A QUARTZ MINIATURISE DE GRANDE PURETE SPECTRALE

Download or read book ETUDE DE RESONATEURS ET D OSCILLATEURS A QUARTZ A TRES BASSES TEMPERATURES written by ABDELLATIF.. EL HABTI and published by . This book was released on 1993 with total page 111 pages. Available in PDF, EPUB and Kindle. Book excerpt: CE MEMOIRE TRAITE, EN SA MAJEURE PARTIE, DE LA MESURE DU COEFFICIENT DE QUALITE DES RESONATEURS A QUARTZ AYANT SUBI DIFFERENTS TRAITEMENTS DE SURFACE. LES MESURES SONT EFFECTUEES ENTRE 300 K ET 1,4 K ET POUR DIFFERENTS PARTIELS. ON MONTRE QU'EN DESSOUS DE 20 K, L'INVERSE DU COEFFICIENT DE QUALITE EST LA SOMME D'UN TERME EN T PUISSANCE 4 ATTRIBUE A L'ATTENUATION INTRINSEQUE DU CRISTAL DE QUARTZ ET D'UN TERME CONSTANT. CE DERNIER TERME QUI VARIE CONSIDERABLEMENT D'UN QUARTZ A UN AUTRE EST ATTRIBUE A LA RUGOSITE EN SURFACE, A LA PRESENCE D'UNE COUCHE AMORPHE EN SURFACE ET EVENTUELLEMENT A L'AMORTISSEMENT PAR LES SUPPORTS. CE RESULTAT EST OBTENU APRES EVALUATION PAR DES MODELES THEORIQUES D'UNE PART ET D'AUTRE PART PAR DES EXAMENS SUR DES RESONATEURS DONT LES QUARTZ ONT ETE ANALYSES AUX RAYONS X ET PAR UNE METHODE D'INTERFEROMETRIE POUR LE CONTROLE DE L'ETAT DE SURFACE. LA SECONDE PARTIE DE CE TRAVAIL EST CONSACREE A LA REALISATION D'UN OSCILLATEUR QUI FONCTIONNE AUSSI BIEN A LA TEMPERATURE AMBIANTE QU'A TRES BASSE TEMPERATURE. CET OSCILLATEUR A PERMIS DE MESURER LA VARIATION DE LA FREQUENCE EN FONCTION DE LA TEMPERATURE POUR DIFFERENTES COUPES DE QUARTZ A SIMPLE ROTATION. ON TROUVE POUR T INFERIEURE A 15 K UNE VARIATION DE FREQUENCE DE L'ORDRE DE 1 HZ PAR #OK

Download or read book Contribution l tude des oscillations forc es du quartz written by Jean-Louis Milan and published by . This book was released on 1968 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book tude et r alisation d un oscillateur quartz tr s basse temp rature written by Gabriel Mossuz and published by . This book was released on 1975 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: ETUDE D'OSCILLATEURS A QUARTZ DEVANT FONCTIONNER A TRES BASSE TEMPERATURE. L'ECART DE FREQUENCE D'OSCILLATION ENREGISTRE PEUT ETRE CORRIGE EN REALISANT A LA T AMBIANTE DES QUARTZ DE FREQUENCE CONVENABLE. UTILISATION D'UN MATERIEL CRYOGENIQUE TRES EVOLUE. ETUDE DU VIEILLISSEMENT DES RESONATEURS A QUARTZ ET DES COMPOSANTS ELECTRONIQUES AUX T CRYOGENIQUES. ETUDE DE LA STABILITE A COURT TERME. ETUDE DU RESONATEUR ET DE L'ELECTRONIQUE DE L'OSCILLATEUR, L'UTILISATION DE TRES BASSES TEMPERATURES DOIT PERMETTRE D'AMELIORER LES STABILITES.

Download or read book ETUDE D UN OSCILLATEUR THERMOSTATE A QUARTZ A ONDES DE SURFACE written by PATRICK.. LEBLOIS and published by . This book was released on 1990 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt: LE DEVELOPPEMENT DES APPLICATIONS TEMPS-FREQUENCE DANS LES DOMAINES MILITAIRES, SPATIAUX ET DES TELECOMMUNICATIONS NECESSITE DES SOURCES HAUTE FREQUENCE DE GRANDE PURETE SPECTRALE ET DE GRANDE STABILITE DANS LE TEMPS. L'ETUDE D'UN OSCILLATEUR A QUARTZ A ONDES DE SURFACE THERMOSTATE, DE TYPE PILOTE, MINIATURISE ET FONCTIONNANT A LA FREQUENCE DE 480 MHZ A ETE EFFECTUEE. CETTE ETUDE COMPREND: 1) LA CARACTERISATION DU RESONATEUR A ONDES DE SURFACE A QUARTZ (FABRIQUE PAR THOMSON SINTRA); 2) LA MISE AU POINT DE L'ELECTRONIQUE DE L'OSCILLATEUR ET DU THERMOSTAT; 3) L'ANALYSE DES CARACTERISTIQUES DE STABILITE, DE PURETE SPECTRALE ET DE TENUE A L'ENVIRONNEMENT DE L'OSCILLATEUR. LE RESONATEUR A ONDES DE SURFACE A 480 MHZ EST FERME SOUS VIDE AVEC UN BOITIER TOUT QUARTZ. UN SUPPORT A ETE CONCU AFIN DE MESURER SES PARAMETRES DE MANIERE PRECISE ET REPETITIVE, SANS L'ENDOMMAGER. L'ELECTRONIQUE DE L'OSCILLATEUR, COMPORTANT UN AMPLIFICATEUR DE BOUCLE A GAIN AJUSTABLE, UN DEPHASEUR, UN COUPLEUR DIRECTIONNEL ET UN AMPLIFICATEUR D'ISOLATION DE SORTIE A ETE ETUDIE AVEC LA TECHNOLOGIE DES CIRCUITS HYBRIDES; LE THERMOSTAT EST INTEGRE DANS UN CIRCUIT PREDIFFUSE. LA CARACTERISATION EXPERIMENTALE DE CET OSCILLATEUR A ETE EFFECTUE AUSSI BIEN PAR SA SENSIBILITE AUX PERTURBATIONS EXTERIEURES (TEMPERATURE, PRESSION, ACCELERATION, VIBRATION) QUE PAR SES PERFORMANCES INTRINSEQUES (STABILITE A COURT ET LONG TERME, PURETE SPECTRALE). POUR CE FAIRE, DIFFERENTES METHODES DE MESURE ADAPTEES A CE TYPE D'OSCILLATEUR ONT ETE ETUDIEES. NOUS AVONS NOTAMMENT DEVELOPPE UN BANC DE MESURE DE BRUIT DE PHASE PAR MULTIPLICATION DE FREQUENCE. CE DERNIER PERMET DE CARACTERISER DES OSCILLATEURS DONT LA FREQUENCE DE FONCTIONNEMENT EST DISPERSEE AINSI QUE DES OSCILLATEURS NON COMMANDABLES EN TENSION

Download or read book Contribution l tude des oscillation forc es du quartz written by Jean-Louis Milan and published by . This book was released on 1968 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Precision Measurement and Fundamental Constants Proceedings written by United States. National Bureau of Standards and published by . This book was released on 1971 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Strap down Inertial Systems written by and published by . This book was released on 1978 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book UCRL written by U.S. Atomic Energy Commission and published by . This book was released on 19?? with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Frequency and Time written by P. Kartaschoff and published by . This book was released on 1978 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Satellite Situation Report written by Goddard Space Flight Center. Office of Public Affairs and published by . This book was released on 1977 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Ionospheric Radio written by Kenneth Davies and published by IET. This book was released on 1990 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt: This introductory text replaces two earlier publications (Davies 1965, 1969). Among the topics: characteristics of waves and plasma, the solar-terrestrial system, the Appleton formula, radio soundings of the ionosphere, morphology of the ionosphere, oblique propagation, importance of amplitude and phase, earth-space propagation. Annotation copyrighted by Book News, Inc., Portland, OR

Download or read book Organic Solid State Lasers written by Sébastien Forget and published by Springer. This book was released on 2013-07-03 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: Organic lasers are broadly tunable coherent sources, potentially compact, convenient and manufactured at low-costs. Appeared in the mid 60’s as solid-state alternatives for liquid dye lasers, they recently gained a new dimension after the demonstration of organic semiconductor lasers in the 90's. More recently, new perspectives appeared at the nanoscale, with organic polariton and surface plasmon lasers. After a brief reminder to laser physics, a first chapter exposes what makes organic solid-state organic lasers specific. The laser architectures used in organic lasers are then reviewed, with a state-of-the-art review of the performances of devices with regard to output power, threshold, lifetime, beam quality etc. A survey of the recent trends in the field is given, highlighting the latest developments with a special focus on the challenges remaining for achieving direct electrical pumping of organic semiconductor lasers. A last chapter covers the applications of organic solid-state lasers.

Download or read book Frequency Variations of an Oblique 5 MHz Ionospheric Transmission written by Kurt Toman and published by . This book was released on 1971 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 5-MHz WWV-transmission originating on the east coast of the United States at Beltsville, Maryland was received 604 km from the transmitter at Air Force Cambridge Research Laboratories, Bedford, Massachusetts. At the receiving end narrow filters were employed to separate the carrier frequency from the upper-side-band frequencies. The 5 MHz carrier frequency was heterodyned to 500 kHz and compared with a 500 kHz reference signal of an oscillator whose frequency stability was about 1 part in 10 to the 9th power. The diurnal frequency variation of the 5 MHz ionospheric signal was obtained for days selected from the year 1965. Optimum frequency stability was observed near noon. For 24 March 1965 the diurnal behavior of the 600 Hz modulation phase was obtained. Virtual height data from an ionosonde station located near the midpoint of the path were compared with Doppler frequency variations. (Author).

Download or read book Inertial Navigation Systems Analysis written by Kenneth Robert Britting and published by GNSS Technology and Applicatio. This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Out-of-print for years, this highly sought-after volume, remains the most popular reference on inertial navigation systems analysis. Finally, this classic book is back in print and readily available only from Artech House. Authored by a pioneer in the field, this authoritative resource focuses on terrestrial navigation, but is also useful for air and sea applications. Packed with valuable, time-saving equations and models, the book helps engineers design optimal navigation systems by comparing the performance of the various types of system mechanizations. Although applications and technology have changed over the years, this book remains the best source for fundamental inertial navigation system knowledge, from notational conventions, reference frames, and geometry of the earth, to unified error analysis, self-alignment techniques, and the development of a system error model. This well-illustrated, timeless reference belongs on the shelf of every practicing engineer working in this area.

Download or read book Mechanical Vibration written by William John Palm and published by . This book was released on 2007 with total page 728 pages. Available in PDF, EPUB and Kindle. Book excerpt: Model, analyze, and solve vibration problems, using modern computer tools. Featuring clear explanations, worked examples, applications, and modern computer tools, William Palm's Mechanical Vibration provides a firm foundation in vibratory systems. You'll learn how to apply knowledge of mathematics and science to model and analyze systems ranging from a single degree of freedom to complex systems with two and more degrees of freedom. Separate MATLAB sections at the end of most chapters show how to use the most recent features of this standard engineering tool, in the context of solving vibration problems. The text introduces Simulink where solutions may be difficult to program in MATLAB, such as modeling Coulomb friction effects and simulating systems that contain non-linearities. Ample problems throughout the text provide opportunities to practice identifying, formulating, and solving vibration problems. KEY FEATURES Strong pedagogical approach, including chapter objectives and summaries Extensive worked examples illustrating applications Numerous realistic homework problems Up-to-date MATLAB coverage The first vibration textbook to cover Simulink Self-contained introduction to MATLAB in Appendix A Special section dealing with active vibration control in sports equipment Special sections devoted to obtaining parameter values from experimental data