A hydrogen atomic frequency standard vacuum maintenance device

Abstract

The invention provides a vacuum maintenance device for a hydrogen atomic frequency standard. On the one hand, the weight of the device is much lower than that of the sputtering ion pump. The hydrogen atomic frequency standard must continuously generate a large amount of hydrogen during the working process. The traditional hydrogen atom The frequency standard uses a sputtering ion pump to absorb the hydrogen, because the larger the volume and weight of the pump, the greater the total amount of hydrogen absorbed, and the longer the service life of the product, so the sputtering ion pump of the traditional hydrogen atomic frequency standard weighs More than ten kilograms, and the hydrogen absorption capacity of the getter is very large. Under the condition of absorbing the same hydrogen, the weight can be greatly reduced. The weight of the new device is only 2-3kg. On the other hand, the sputtering ion pump works under the conditions of high pressure and magnetic field. After working for a period of time, there will be irregular ignition, which will affect the indicators of the whole machine. This device absorbs hydrogen physically, without electric field and Due to the influence of the magnetic field, it can run smoothly without the phenomenon of sparking, which is conducive to the optimization of the whole machine index.

Description

technical field [0001] The invention relates to a hydrogen atom frequency standard, in particular to a hydrogen atom frequency standard vacuum maintenance device. Background technique [0002] The hydrogen atomic frequency standard has excellent short-to-medium-term frequency stability, and its working characteristics are high index, reliable operation, and long life. It has a good application prospect in ground, vehicle, spaceborne and other application environments. The hydrogen atomic frequency standard requires a working life of 5 years or more for navigation, positioning, and punctuality. [0003] One of the key factors restricting the long life of the hydrogen atomic frequency standard is the life of the vacuum maintenance device. At present, the vacuum maintenance device in the domestic hydrogen atomic frequency standard usually uses a sputter ion pump. The working characteristics of the sputtering ion pump are no oil, no vibration, no noise, easy and reliable to us...

AI Technical Summary

Problems solved by technology

[0008] After the sputtering ion pump is used for too long, the cathode titanium plate is severely bombarded, resulting in increased accumulation of titanium in the edge area, or causing the cathode plate to overheat and deform, or the cathode titanium plate is hit, etc., which will lead to the failure of the sputtering ion pump

At present, domestic hydrogen atomic frequency standards use sputtering ion pumps as vacuum maintenance devices, and their service life is only about 1 to 3 years, which seriously restricts the application field of hydrogen atomic frequency standards. In order to prolong the life of sputtering ion pumps, sputtering ion pumps can be added The volume and weight of the pump, but this will increase the volume and weight of the whole machine, which greatly limits the application range of the hydrogen atomic frequency standard. In addition, the sputter ion pump also has poor vibration resistance of the mechanical structure. There is also the disadvantage of sparking

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