DocumentCode :
3221868
Title :
Frequency-temperature characteristics of quartz crystal units of different cuts operating over a wide temperature range including helium temperatures
Author :
Smagin, A.G.
Author_Institution :
Crystal Co., Moscow, Russia
fYear :
1995
fDate :
31 May-2 Jun 1995
Firstpage :
843
Lastpage :
847
Abstract :
Investigation of frequency vs temperature dependence of quartz crystal elements of singly- and doubly-rotated cuts during excitation of B- and C-type vibrations in them has been carried out over the temperature range from 4 to 400 K. The plate orientation accuracy was ±30". Isonormal quasitransversal vibrations and pure shear vibrations have been exited in metallized piezo-electric elements at frequency 5 MHz and 10 MHz. When setting up equations it is necessary to take into account the change of curvature sign due to relaxation and to make operations with generalized frequency-temperature characteristics (FTCs). FTCs of yxbl/+15°/-35°19\´ crystal units (type B-vibrations) have extrema at T=86 K and 229 K. FTCs of crystal units of the same cut in which vibrations of type C have been excited, have no extrema except for the maximum at T-0 K. Crystal units of other cuts have such FTC features as maxima, minima and flat portions with the inflection
Keywords :
crystal resonators; quartz; relaxation oscillators; 10 MHz; 4 to 400 K; 5 MHz; B-type vibrations; C-type vibrations; FTC features; SiO2; doubly-rotated cuts; frequency-temperature characteristics; isonormal quasitransversal vibrations; metallized piezo-electric elements; plate orientation accuracy; pure shear vibrations; quartz crystal units; relaxation; singly-rotated cuts; temperature range; Cooling; Frequency measurement; Helium; Isothermal processes; Nitrogen; Optical resonators; Temperature dependence; Temperature distribution; Temperature measurement; Temperature sensors;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Frequency Control Symposium, 1995. 49th., Proceedings of the 1995 IEEE International
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-2500-1
Type :
conf
DOI :
10.1109/FREQ.1995.484094
Filename :
484094
Link To Document :
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