Oscillators – Automatic frequency stabilization using a phase or frequency... – Molecular resonance stabilization
Patent
1980-02-05
1982-04-20
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Molecular resonance stabilization
331 941, H03L 726
Patent
active
043261744
ABSTRACT:
The invention, which may be used in particular as a frequency standard, seeks to avoid disturbance in the control action in respect of the cavity 10 by a powerful parasite signal due to the line of stimulated emission. Control of the cavity and control of the oscillator 1 on the line of stimulated emission control in a shared-time mode. A control circuit 40 acts on the carrier by way of a programmable synthesizer 43, the carrier than assuming the successive values .omega..sub.+, .omega..sub.H, .omega..sub.-, .omega..sub.H, .omega..sub.+, etc. in stages. .omega..sub.H is centered on the line of stimulated emission; .omega..sub.+ and .omega..sub.- which are symmetrically shifted interrogate the flanks of the emission line. By means of a signal INH, the control circuit 40 periodically suppresses the output of an active filter 42 and thus interrupts the detection action used for controlling the cavity, during the periods in which .omega..sub.Q is equal to .omega..sub.+ or .omega..sub.-. This detection action occurs only when .omega..sub.Q =.omega..sub.H, and after a damping dead time.
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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