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ESA – Biomass cleared for fuelling

March 31, 2025
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ESA – Biomass cleared for fuelling
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Since its arrival at Europe’s Spaceport in French Guiana three weeks in the past, ESA’s Biomass satellite tv for pc has been beneath the scrutiny of satellite tv for pc engineers who’ve been rigorously executing the lengthy listing of duties on the ‘to do’ listing to make this new Earth Explorer mission prepared for liftoff on 29 April. The most recent milestone handed, is that Biomass’ propulsion subsystem has been ready for fuelling and has undergone thorough system checks.

The check-out course of was carried out by the OHB-Sweden group, who impressively managed to finish their duties a full day forward of schedule.

For these , right here’s some engineering particulars
The propulsion subsystem consists of a number of metres of tubing, guaranteeing that the hydrazine propellant, saved within the 177-liter tank, reaches all eight thrusters. These thrusters are organized in pairs on the 4 corners of the satellite tv for pc.

To manage propellant movement and facilitate fuelling and pressurisation, the system incorporates a number of valves, together with movement management valves, latching valves, and repair valves.

Every thruster is safeguarded by two movement management valves positioned in collection—each of which should be opened when the thruster is firing. For security, these valves stay closed by default; except powered, inside magnets maintain them shut.

The system is additional divided into two thruster branches, every containing 4 thrusters, remoted from the primary tank by latching valves. These bistable valves preserve their state—both open or closed—till actively switched, permitting managed isolation or activation of a complete thruster department.

At this stage, all valves have been rigorously checked for leaks. The leak testing course of entails pressurising one facet of a closed valve with helium whereas making a vacuum on the downstream facet. A helium detector then measures any traces of fuel that cross by. Given the interior quantity and floor space concerned, these assessments require appreciable time and precision.

With the propulsion system efficiently passing all checks, the satellite tv for pc is now safeguarded towards propellant loss as soon as loaded, guaranteeing its readiness for propellant fuelling.

Whereas testing the propulsion subsystem is a meticulous and time-intensive job, it stays an important step in getting ready for liftoff on a Vega-C rocket on 29 April.

And again to the overall stuff
As soon as in orbit and commissioned, Biomass mission will play a key position in delivering novel details about the state of our forests, how they’re altering over time, and advance our information of the carbon cycle. It’s the first satellite tv for pc to hold a totally polarimetric P-band artificial aperture radar for interferometric imaging. Because of the lengthy wavelength of P-band, round 70 cm, the radar sign can slice by the entire forest layer to measure the ‘biomass’, which means the woody trunks, branches and stems, which is the place bushes retailer most of their carbon.



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