Deep in Chile’s Atacama Desert, the Extremely Large Telescope (ELT) is poised to transform our understanding of the universe. Its massive 39-meter primary mirror, composed of 798 segments, must remain flawlessly reflective to capture the faintest cosmic light. But how do scientists ensure its continuous performance? The answer lies in cutting-edge technology – where GF plays an important role.
ELT: A new era in space exploration
Set to become the world’s largest optical and infrared telescope, the ELT will enable astronomers to explore distant galaxies, analyze planets’ atmospheres for signs of life, and study the universe’s earliest stars. Its location atop Cerro Armazones, at 3,060 meters above sea level, provides the ideal conditions for clear observations. Equipped with advanced adaptive optics, the ELT, which will become operational in 2029, is expected to deliver images 16 times sharper than those from the Hubble Space Telescope.
How the ELT will look like at Cerro Armazones. Source: ESO (European Southern Observatory).
Ensuring a crystal-clear view of space
To function at their best, the ELT’s mirror segments must be recoated every 18 months. This means two segments are removed, cleaned, and recoated daily – a process that requires extreme precision. Swedish company Fagerström Industrikonsult AB, responsible for designing the telescope’s specialized washing and stripping plant, turned to GF for reliable, high-performance piping and automation technology.
High-tech cleaning for high-stakes science
GF’s PROGEF Standard, chosen for its durability and resistance to harsh chemicals, plays a key role in the mirror recoating process. It safely transports sulfuric acid and cerium sulfate, which remove the old silver coating, before the mirrors are washed with ultrapure water and dried using high-powered air knives. GF’s automated valves, sensors, and measurement technology ensure smooth operation, precisely controlling the flow, pressure, and temperature of these critical substances.
“We provided a complete process automation package, including both manual and automated valves, as well as critical measurement sensors. Working with Fagerström on this project is an exciting opportunity to contribute to cutting-edge technology that brings us closer to understanding the universe.”, said Peter Ernström, Process Automation Specialist at GF Piping Systems.
Fagerström Industrikonsult AB turned to GF for reliable, high-performance piping and automation technology. Source: GF Piping Systems.
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Published: 3 April 2025
