The MicroCarb satellite was successfully launched during the night of July 25 to 26, 2025, from the Guiana Space Centre aboard a Vega C launcher operated by Arianespace. Developed by CNES, this 180 kg microsatellite is the first European mission dedicated to mapping carbon dioxide (CO₂) fluxes on a global scale—an essential step in understanding climate change.
To achieve this goal, MicroCarb utilizes a high-precision spectrometer capable of detecting CO₂ variations with a sensitivity of approximately 1 ppm (parts per million). The instrument relies on a complex optical chain designed to operate under extreme conditions, including cryogenic environments. The data collected will enhance scientific knowledge of the carbon cycle and support international climate policies.
Optical expertise for space applications
As part of this mission, Bertin Winlight, a subsidiary of the Bertin Technologies group, was selected by Airbus Defence and Space Toulouse to design, manufacture, and qualify several critical optical subassemblies for the MicroCarb instrument. These components are essential for capturing, filtering, and directing light to extract the data required for CO₂ measurement.
Bertin Winlight teams delivered:
- Optical prisms for light separation and alignment
- Detection filters to isolate relevant wavelengths, designed for cryogenic operation
- A cryostat window with a beam splitter
- Optical masks to reduce stray light interference
Bertin Winlight managed the entire production process: from optical substrate manufacturing and subassembly integration to qualification testing and technical documentation. Optical coatings were carried out by CILAS, a recognized expert in the field. These components were integrated and tested according to the most demanding space standards, ensuring their reliability and performance in orbit.
A tangible contribution to climate science
By contributing to the success of MicroCarb, Bertin Winlight reaffirms its position as a key player in high-performance space optics. This mission highlights the company’s ability to support major scientific programs and deliver cutting-edge technologies in service of the planet.
