Oscillators – Molecular or particle resonant type
Patent
1986-05-23
1987-11-10
LaRoche, Eugene R.
Oscillators
Molecular or particle resonant type
331 3, H01S 106
Patent
active
047060433
ABSTRACT:
A compact, self-contained and economical frequency standard uses a passive hydrogen maser to provide an accurate, repeatable, and stable standard frequency. The hydrogen dissociator and microwave cavity of the maser and circuit means coact to reduce the frequency variations possible with prior systems and to promote and emphasize the energy transfer from hyperfine hydrogen atoms to the frequency standard for its stabilization. The dissociator is accurately alignable to transfer its hyperfine hydrogen atoms of a selected state to a microwave cavity; and the microwave cavity is formed by dielectric surfaces which have been coated with a conductive coating in a predetermined configuration to suppress oscillation in undesirable modes. The dissociator and microwave cavity thus coact to present within the microwave cavity a maximum obtainable portion of hyperfine hydrogen atoms generated by the dissociator and to enhance the release of and the detection of the energy released by the hyperfine hydrogen atoms at hydrogen resonance frequency. The circuit means reliably lock the carrier frequency generated from the standard frequency of a VCXO at hydrogen resonance frequency rather than one of the phase modulation sidebands of the carrier, resulting in a predictable, accurate, and stable standard frequency.
REFERENCES:
patent: 2698923 (1955-01-01), Edson
patent: 3792368 (1974-02-01), Audoin
patent: 4122408 (1978-10-01), Walls
patent: 4123727 (1978-10-01), Peters
Helwig, H. & Walls, F. L.; A New . . . of Passively Operating Hydrogen Frequency Standard; Proc. 30th Annual Sump. on Freq. Control, pp. 473-480 (1976).
Crampton, S. B.; Fleri, E. C. & Wang H. T. M.; Effects of Atomic Reasonance Broadening Mechanisms on Atomic Hydrogen Maser Long Term Frequency Stability; Metrologia 13v pp. 131-135 (1977).
Howe, D. A., Walls, F. L., Bell, H. E. & Hellwig, H.; A Small Passively Operated Hydrogen Maser; Proc. 33rd Annual Symp. on Freq. Control, pp. 554 et seq. (1979).
Lewis Lindon L.
Smith Thomas E.
Stein Samuel R.
Alberding Gilbert E.
Ball Corporation
LaRoche Eugene R.
Pascal Robert J.
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