Engineering topics
Publications and source records attributed to Vessot, R..
Operation of new space fountain clocks now provides levels of accuracy and frequency stability approaching one part in 10(sup )16.
Flat coil has rigid printed circuit substrate. New coil structure minimizes RF electric field near glass walls of plasma vessel; therefore reduces direct electron bombardment of glass. Design lends itself well to high production and standardized dimensions.
Varying the density of the atoms in the cavity changes the Q of the atoms. When the cavity is mistuned, the density variation causes a frequency variation proportional to the degree of cavity mistuning.
Hydrogen maser for field use with cavity and bulb design of maser for satellite applications
Hydrogen maser is stable short-term and long-term frequency reference for precision tracking systems. Its resettability is expressed as the rms deviation from the mean.
Cross correlation measurements of oscillator frequency stability and thermal noise and application to atomic hydrogen maser
Direct frequency comparison of atomic hydrogen masers in different places and conditions by simultaneous monitoring of Loran C signals