THE STABILITY AND Q-FACTOR OF QUARTZCRYSTALS EXCITED BY THE PARALLEL FIELD TECHNIQUE.
Final rept. for 1 Jun 63-31 May 64,
OBSERVATOIRE DE PARIS (FRANCE)
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The project was concerned with the development of the excitation techniques derived from the parallel field excitation to the frequency standards and for small crystals to be sealed in HC 27 holders. Phase 1 was devoted to the study of a method for the determination of the geometrical constants of crystals to minimize the coupling between the fundamental and unwanted modes. This enabled to set the tables giving the optima diameters as function of the frequency as well as the possible coutours. Phase 2 concerns the applications of the above method to 1 Mc crystals of about 25mm diameter excited by composite field and to 1 Mc crystals of about 14mm diameter. Phase 3 involved the study of 5 Mc crystals excited by composite and normal field using annular electrodes. Author