Oscillators – Automatic frequency stabilization using a phase or frequency... – Molecular resonance stabilization
Patent
1980-06-19
1982-05-25
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Molecular resonance stabilization
331 941, H03L 726
Patent
active
043319335
ABSTRACT:
Perceived atomic resonance frequency error resulting from microwave power level changes in atomic clocks is eliminated by controlling the device's microwave power source output in response to deviations from a fixed frequency relationship between the main atomic peak and a sidelobe peak of the atomic beam frequency spectrum. This is accomplished by a microwave power control servo system that includes a time sharing interrogation circuit for detecting and monitoring the frequencies of the main atomic peak and the sidelobe peak and a comparator that compares the frequencies of the main atomic and sidelobe peaks and generates a feedback control signal in response to frequency differences between the two that deviate from a fixed difference frequency. The feedback signal is used to control the microwave power source output in a manner that constrains the main atomic peak and the sidelobe peak at a fixed offset frequency.
REFERENCES:
patent: 2960663 (1960-11-01), Mainberger
patent: 3076942 (1963-02-01), Holloway et al.
patent: 3368160 (1968-02-01), Helgesson
Glaze et al., "Recent Progress on the NBS Primary Frequency Standard", Proc. of the 27th Annual Symposium on Freq. Control; May 1973, pp. 347-356.
Allan et al., "Some Causes and Cures of Freq. Instabilities in Cesium Beam Freq. Standards", Proc. of the 31st Annual Symposium on Freq. Control; Jun. 1977; pp. 555-561, distributed 10/28/77.
Allan David W.
Garvey R. Michael
Grimm Siegfried H.
Matthews Willard R.
Singer Donald J.
The United States of America as represented by the Secretary of
Westin Edward P.
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