Accession Number : AD0282861

Title :   CRYSTAL UNITS WITH IMPROVED TEMPERATURE CHARACTERISTICS

Corporate Author : MOTOROLA INC CHICAGO ILL

Personal Author(s) : MUNN,R. ; KRIEGER,K.

Report Date : 30 JUN 1962

Pagination or Media Count : 1

Abstract : Methods of applying forces to quartz crystals were investigated. These included peripheral sliding devices, which were limited by frictional forces, chordal forces, which proved to be insensitive, and diametral forces which were found to be the most satisfactory. An investigation of materials which might be used to produce nonlinear forces due to non-linear expansion characteristics with temperature revealed that, while certain titanates of barium exhibited nonlinearities, hysteresis effects were prohibitively large. A technique was evolved whereby the compensating ele ents could be set at any specified temperature, thus eliminating procedures involving the accurate measurement and setting of gaps between the bimetal arms and crystal edge. In addition to the effects of temperature on the compensated quartz units, some ging data was obtained and the performance under conditions of vibration at various frequencies was determined. (Author)

Descriptors :   *QUARTZ, *QUARTZ RESONATORS, AGING (PHYSIOLOGY), CRYSTAL HOLDERS, FREQUENCY SHIFT, HYSTERESIS, TEMPERATURE, VIBRATION

Distribution Statement : APPROVED FOR PUBLIC RELEASE