Low helium permeability atomic frequency standard cell and metho

Details Low helium permeability atomic frequency standard cell and metho Low helium permeability atomic frequency standard cell and metho

1992-07-17

1993-10-26

Grimm, Siegfried H.

Oscillators

Molecular or particle resonant type

331 3, 324305, H03L 726

Patent

active

052569950

ABSTRACT:
An atomic frequency standard cell having low helium permeability includes first and second windows sealed by fusible annular gaskets to sealing surfaces defined by a tubular cylindrical body. One of the windows defines an opening, and a fill tube is sealed the window adjacent the opening by a tube gasket. The gaskets are made of a lower softening point glass such as borosilicate glass, and the body, windows and fill tube are formed of a higher softening point glass such as aluminosilicate glass. The assembly is sealed together by heating it to a temperature that causes the gaskets to fuse and seal the adjacent components together.

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Thomas C. English and Ernst Jechart; Proc. 35th Ann. Freq Control Symposium, USAERADCOM, Ft. Monmouth, N.J., 07703, May 1991 "Development of a Sapphire Lamp for Use in Satellite-Borne Atomic Rubidium Clocks"; Eframtom Systems Corporation, Irvine, California 92715, pp. 637-645.

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