Résonateur à quartz pour environnement sévère

“…Using largely the electrical analogy, this study authorized the establishment of The symmetrical structure has been performed essentially in order to reduce the acceleration sensitivi-ty of the B.V.A. resonators [10]. The symmetry effect is well known [11] and imposes particularly a symmetrical mounting showing a plane of symmetry parallel to the main plane of the crystal resonator and located at its middle point.…”

Section: Bva Resonatormentioning

confidence: 99%

Quartz resonators thermal modelization using located constants networks

Galliou

Valentin

1987

Rev. Phys. Appl. (Paris)

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Un rappel succinct des résultats récents sur la modélisation thermique des résonateurs à quartz est d'abord présenté; ensuite, la méthode consistant à établir un réseau à constantes localisées à base de résistances et condensateurs est appliquée à une nouvelle structure symétrique de résonateur à quartz. Le modèle construit est testé par comparaison des courbes fréquence-température expérimentales et celles obtenues par le calcul. Le diagramme de Bode de la fonction de transfert thermique est obtenu par analogie électrique. Il apparaît que la nouvelle structure symétrique est particulièrement insensible aux fluctuations rapides de température et qu'une enceinte rudimentaire suffit. De plus, une adaptation de la constante de temps de la structure aboutit à un régime « critique » qui permet d'atteindre rapidement la fréquence finale du résonateur dans le cas d'un chauffage rapide.Abstract. -A short recall on recent results about the thermal modelization of quartz resonators is first presented ; next, the method consisting on establishing a located constants network with resistors and capacitors is applyed to the case of a new symmetrical structure of quartz resonator. The designed model is tested by comparison of the experimental frequency versus temperature curves with the calculated ones. By analogy with electrical area, the Bode diagram of the thermal transfer function is obtained. It is pointed out that the new symmetrical structure is particularly insensitive to fast thermal disturbances and may be used with rough ovens. Moreover, with a matched time constant of the structure, a « critical » state appears which permits to rise very quickly the final frequency of the resonator for fast warm up.

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“…In order to reduce the influence of this support [1] and the influence of faults in the construction [2] when the resonator is under environmental conditions, a particular solution has recently been put forward. It consists in increasing the width of the connections between the crystal and its supports to an optimal limit defined by calculation.…”

Section: -Introductionmentioning

confidence: 99%

Effects of radially applied angular sector stresses on the frequency of doubly rotated quartz crystal

Delaite

1991

Il Nuovo Cimento D

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Summary. --A theoretical study is presented to determine the sensitivity of a doubly rotated crystal resonator, subject to radial compression along two diametrically opposed zones. The variation of frequency is calculated as a function of the stresses applied to the crystal, then a coefficient of sensitivity is deduced. Some solutions are put forward for obtaining the stability of frequency of a resonator in the particular case where a quartz crystal, stress compensated (SC), is used. Moreover, the particular conditions are described for limiting the influence of possible faults in the construction of such quartz resonators, which must be employed when a very high stability of frequency is needed.PACS. 77.60 -Piezoelectricity and electrostriction.

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Résonateur à quartz pour environnement sévère

Cited by 6 publications

References 3 publications

Crystal resonator design for space applications

Crystal resonator design for space applications

Quartz resonators thermal modelization using located constants networks

Effects of radially applied angular sector stresses on the frequency of doubly rotated quartz crystal

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