What does HM stand for?

Summary: Smart Technology & Control Enhances Reliability & Maintenance-Free Operation T4Science, a Swiss company of the Orolia group, which is publically traded on the NYSE Euronext Paris index (NYSE Alternext Paris -- FR0010501015 -- ALORO), and a global leading supplier of high performance hydrogen maser clock references, today announced the warranty extension of its new iMaser 3000 product up to 7 years.

This is the first extension of Hydrogen maser, which is the most stable atomic microwave clock and related to the Nobel Prize in Physics 1989, from microwave regime to optical regime.

The key components of the Galileo system, particularly the new signal generator and the extremely accurate Passive Hydrogen Maser atomic clock, proved to be perfectly fit for purpose, even when tested under real-time conditions.

The satellite also lacks its own ultra-precise hydrogen maser `clock', so the tracking stations pipe up the time and frequency signals needed for VLBI.

Because the hydrogen maser is more stable than the cesium clock over short periods of time, it is useful as a secondary time standard and for making high-precision frequency measurements.

His presentation will have a particular emphasis on mature technologies including rubidium oscillators, cesium beam frequency standards and hydrogen masers.

3 GHz using a source locked to a hydrogen maser in the NIST time scale.

When applied to a hydrogen maser, which produces microwave radiation of a specific frequency, a nonlinear correction to quantum mechanics would mean the maser's output frequency depends on the number of excited hydrogen atoms pouring into the cavity where the device amplifies the radiation.