Oscillators – Automatic frequency stabilization using a phase or frequency... – Molecular resonance stabilization
Patent
1980-02-05
1982-02-16
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Molecular resonance stabilization
331 941, H03L 726
Patent
active
043161537
ABSTRACT:
The maser of the invention is particularly suitable for forming a frequency standard, by virtue of its excellent degree of frequency stability. The stimulating signal injected into a hydrogen maser cavity 10 is phase modulated at a single modulating frequency from a source 34 by a modulator 2. Nevertheless, the envelope detected signal picked off from the cavity and detected by a detector 13 includes two error signal components which respectively represent the difference between the carrier frequency of the injected signal and the frequency of the stimulated emission and the difference between the resonance frequency of the cavity and the said carrier frequency. These components are distinguished by their phases and phase shifters 42 and 44 and bring them respectively into phase with the modulating signal for detection in detectors 23 and 33 whose integrated outputs are used to control the oscillator 1 (and hence the said carrier frequency) and the cavity tuning respectively.
REFERENCES:
patent: 4122408 (1978-10-01), Walls
Walls, "Design and Results from a Prototype Passive Hydrogen Maser Frequency Standard", Proceedings of P.T.T.I., 1976 pp. 369-380.
Walls et al., "A New Kind of Passively Operating Hydrogen Frequency Standard", Proc. 30th Annual Symposium on Frequency Control, 2-4 Jun. 1976, pp. 473-480.
Brandenberger Helmuth-Hugo
Busca Giovanni
Ebauches S.A.
Grimm Siegfried H.
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