Accession Number : ADD009525

Title :   Resonator Insensitive to Paraxial Accelerations.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC

Personal Author(s) : Nakazawa,Mitsuo ; Ballato,Arthur

Report Date : 10 Jun 1982

Pagination or Media Count : 9

Abstract : This invention relates to the field of piezoelectric resonators and more particularly to quartz crystal resonators that are highly insensitive to paraxial accelerations. Frequency perturbations are produced in thickness mode crystal resonators by acceleration-induced forces acting on the body of the resonator. These forces are distributed throughout the resonator volume and vary with the acceleration direction. For specific acceleration directions, the effect can be sharply reduced by changing the points of application of the mounting supports. When the acceleration direction is known in advance, positioning the resonator with respect to the direction minimizes the problem. In high shock and vibration environments, however, accelerations occur in arbitrary directions with ensuing large frequency shifts in the crystal resonance frequency. When the acceleration is arbitrarily oriented with respect to the resonator, no crystal cut or combination of mounting supports can by themselves produce cancellations of the frequency perturbations to the extent required.

Descriptors :   *Patent applications, *Piezoelectric effect, *Quartz resonators, *Crystals, Frequency, Acceleration, Intensity, Shock, Frequency shift, Vibration, Resonant frequency, Perturbations, Inventions

Subject Categories : Electrical and Electronic Equipment
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE