A signal inquiry device, a hydrogen atomic frequency standard

Abstract

The present invention proposes a signal interrogation device, comprising a substrate, a lower electrode, a piezoelectric film, and an upper electrode, the lower electrode is arranged on the substrate, and the piezoelectric film is arranged on the lower electrode; The above-mentioned upper electrode is arranged on the piezoelectric film, and the upper electrode and the lower electrode are electrically connected to the power supply respectively, and the thickness of the piezoelectric film is λ, then: λ=α / 2≈v / 2f, where α is the wavelength of the sound wave, v is the speed of sound, and f is the frequency of the ground state transition maser signal of the hydrogen atom. The signal interrogation device provided by the present invention realizes high Q value, high power capacity, high energy conversion efficiency, and small temperature coefficient, replaces traditional hydrogen atomic frequency standard microwave resonant cavity and microwave coupling ring, and performs resonant coupling detection on transition signals.

Description

technical field [0001] The invention relates to the field of hydrogen atomic frequency standards, in particular to a signal inquiry device for hydrogen atomic frequency standards. Background technique [0002] Time is one of the five basic physical quantities, and its precise measurement has important scientific research and application value. After entering the 20th century, atomic frequency standards, which use definite energy level transitions to achieve high-precision time output, have gradually matured and been widely used. At present, the practical atomic frequency standards include rubidium atomic frequency standard, cesium atomic frequency standard and hydrogen atomic frequency standard. Among them, hydrogen atomic frequency standard has excellent short-term stability, good long-term stability and drift rate index, and can be used for punctuality and time service , navigation and positioning and communication security and many other fields. [0003] The working pri...

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Problems solved by technology

[0004] The principle limitations of the existing cavity bubble system: first, the problem of internal vacuum pollution, this is a process that increases with the start-up time of the hydrogen atomic frequency standard, and the phenomenon is the deterioration of the stability of the hydrogen atomic frequency standard, due to the internal atomic storage area pollution

According to current analysis, the source of this pollution is the hydrogen frequency standard adsorption pump. The pollutants are composed of inorganic salts, and the release route and rate are unknown.

This type of pollution problem will deteriorate the electrical performance of the hydrogen frequency standard if it is mild, and if it is serious, it will cause the physical function to fail

Secondly, the atomic transition signal is extremely weak. In the process of miniaturization of the microwave cavity, as the size of the microwave resonator becomes smaller, the signal will decrease proportionally, which will inevitably lead to a sharp drop in the accuracy of the system index.

Traditional hydrogen atomic frequency standards also include adsorption pumps, temperature control systems, magnetic shielding, etc., all of which bring difficulties in engineering realization in the process of miniaturization

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