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Diagram of a hydrogen maser A hydrogen maser , also known as hydrogen frequency standard , is a specific type of maser that uses the intrinsic properties of the hydrogen atom to serve as a precision frequency reference.
A hydrogen maser. The hydrogen maser is used as an atomic frequency standard. Together with other kinds of atomic clocks, these help make up the International Atomic Time standard ("Temps Atomique International" or "TAI" in French). This is the international time scale coordinated by the International Bureau of Weights and Measures.
A hydrogen maser produces a very accurate signal (1.42 billion cycles per second), which is highly stable—to one part in a quadrillion (10 15). This is equivalent to a clock that drifts by less than two seconds every 100 million years. [5] A microwave signal derived from the maser frequency was transmitted to the ground throughout the mission.
Download as PDF; Printable version; In other projects Wikidata item; Appearance. ... Five caesium clocks, one passive hydrogen maser, two active hydrogen masers. [26]
Atomic clocks based on hydrogen standards are therefore regarded as secondary representations of the second. Hydrogen masers have superior short-term stability compared to other standards, but lower long-term accuracy. The long-term stability of hydrogen maser standards decreases because of changes in the cavity's properties over time.
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A CBS News investigation found dozens of law enforcement leaders — sheriffs, captains, lieutenants, chiefs of police — buying and illegally selling firearms, even weapons of war, across 23 U.S ...