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ESA – Micro-world inside atomic clock

January 11, 2024
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What appears like an aerial shot of an alien panorama is definitely a scanning electron microscope view of a take a look at glass floor, acquired as a part of a undertaking to enhance the lifetime of spaceborne atomic clocks, discovered on the coronary heart of navigation satellites. Every sharp plasma-etched characteristic seen right here is smaller than 10 micrometres – a hundredth of a millimetre – throughout.

Extremely correct atomic clocks depend on switches between vitality states of an atom’s electron shell, induced by gentle, laser or maser vitality. Forcing atoms to leap from one vitality state to a different causes the emission of an related microwave sign at a particularly steady frequency.

To take the instance of the passive hydrogen maser design – serving because the grasp clock aboard every Galileo satellite tv for pc, conserving time to an estimated precision of 1 second in three million years – a key ingredient is the glass-bulb plasma confiner inside which hydrogen molecules are dissociated into atoms. However chemical etching and different interactions between the hydrogen plasma and glass internal partitions can finally degrade the bulb, affecting the sustainability of the discharge course of.

This microscopic picture exhibits the outcomes, with the conical patterns attributable to etching mechanisms and associated plasma results. It was acquired as a part of an ESA Technology Development Element undertaking with Safran (previously Orolia), looking into characterising these effects to improve the reliability of atomic clocks for space.

Satellite tv for pc navigation depends on highly-precise timekeeping as a result of positioning is calculated primarily based on sign journey occasions multiplied by the pace of sunshine.

Improved variations of passive hydrogen maser and back-up rubidium atomic clocks have been designed for Europe’s new Galileo Second Era satellites.

Timing stability can also be more and more vital for satellite-based telecommunications, with strikes to increased frequencies providing increased knowledge charges however requiring correct time synchronisation in flip, for which smaller chip-sized atomic clocks are in consideration.



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