Passive Rb atom frequency standard locking indication and fault diagnosis method

Abstract

The invention discloses a locking indication and fault diagnosis method for passive rubidium atom frequency scale, which adding a phase-adjustable square wave sampling time sequence signal on the basis of synchronization phase discrimination modulation signal and reference signal, wherein frequency of the sequence signal is fourfold of a modulation signal, and duty ratio of the sequence is 1:1. The sampling time sequence carries locking signal collection for an alternating current generated after quantum frequency discrimination, light detection amplification and square wave reshaping to estimate atom frequency scale locking condition at this point. The method uses continuous four rising edges of sampling time frequency of fourfold modulation signal as trigger pulse to carry level sampling for signal after quantum frequency discrimination, levels of the four rising edges are recorded as D1, D2, D3 and D4, atom frequency scale is estimated if it is in locking state according to recorded four sampling levels, when D1=D2 and D3=D4, the atom frequency scale is in locking state. The method can detect operation state and fault point of the passive rubidium atom frequency scale system, and can easily and conveniently exchange fault module.

Description

technical field [0001] The invention belongs to the technical field of passive rubidium atomic frequency standards, and in particular relates to a method for judging the normal working state and fault diagnosis of passive rubidium atomic frequency standards. Background technique [0002] A passive rubidium atomic frequency standard consists of two parts: physical system and electronic circuit. The physical system is the core component of the passive rubidium atomic frequency standard, which can be roughly divided into two parts: optical pumping spectrum lamp and resonance detection; including spectrum lamp, integrated filter resonance bubble, microwave cavity, photodetector, C field, magnetic screen, etc. . It provides an atomic resonance absorption line with stable frequency and narrow line width. The atomic frequency standard obtains a high-stable frequency signal output by locking the output frequency of the voltage-controlled crystal oscillator on the atomic resonance a...

AI Technical Summary

Problems solved by technology

It is necessary to provide normal locking and fault indication functions in atomic frequency standard products, but most of the existing domestic atomic clock products (including commercial and laboratory research) cannot provide corresponding indication functions well.

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