Atomic clock system with improved servo system

Details Atomic clock system with improved servo system Atomic clock system with improved servo system

1991-08-01

1992-09-08

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Molecular resonance stabilization

331 79, H03B 900, H03L 726

Patent

active

051461846

ABSTRACT:
An improved atomic beam clock apparatus and method are disclosed. The invention substantially reduces errors arising from Rabi pulling and variations in the frequency standard resulting from variations in the amplitude of the microwave signal used to excite the atomic beam. The invention includes a servo loop that adjusts both the microwave frequency and amplitude. The servo loop measures the output of a beam detector at two pairs of microwave frequencies. The output of the detector at each frequency in each pair of frequencies is measured for two different microwave amplitudes. The amplitude data is used to adjust the microwave power such that the output of the detector is maximized at each pair of frequencies. The amplitude modulation scheme of the present invention may also be applied very advantageously to conventional two point frequency modulation schemes.

REFERENCES:
patent: 4914403 (1990-04-01), Nakajima et al.
"Full Digital-Processing in a New Commercial Cesium Standard" by Jean Rabian and Pascal Rochat. 2nd European Frequency and Time Forum Neuchatel-16-17-18 Mar. 1988 Session AFS-02, No. 4.

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