QUARTZ CRYSTAL AGING EFFECTS.
Abstract
One hundred resonators of 16 Mc fundamental fre quency for operation at the 3rd mode have been completed and are presently undergoing aging measurements at 85 C. Q values of resonators exposed to irradiation from the Cs-137 source (34 x 10 to the 6th power rads in 24 hours) during the First Quarter were found to have changed in accordance with the species of quartz. T0 q of natural and cultured quartz resonators was degraded by about 25% whereas that of swept natural and swept cultured quartz was little changed. Forty 10 Mc resonators, plated with Au Au, were fabricated for reliability studies. Aging studies of 34 of these at 85 C were conduc ted. Aging after 30 days was acceptable for all units passing the acceptance standards, and was commonly less than 3 parts in 10 to the 8th power per week. X-ray diffraction source image distor tion (SID) patterns have been made of 15 resona tors, with known aging histories or with pecularities in behavior detected during elec trical measurements. The x-ray diffraction SID technique has displayed a high incidence of strain among units examined and suggests the need for a mount design less likely to exert high stress. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 15, 1963
- Accession Number
- AD0426953
Entities
People
- R.a. Young
- R.b. Belser
- W.h. Hicklin
Organizations
- Georgia Tech