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Shanghai Institute of Optics and Fine Mechanics (SIOM/CAS)

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Chinese Academy of Sciences institute; developer of the ACDL laser subsystem for the DQ-1/DQ-2 missions.

The Shanghai Institute of Optics and Fine Mechanics (SIOM) is a research institute of the Chinese Academy of Sciences (CAS), established in 1964 and located in the Jiading district of Shanghai. SIOM has conducted spaceborne laser and lidar development since 2001.^[1]

SIOM developed the Atmospheric Carbon dioxide Detector (ACDL), the principal science instrument on the Daqi-1 (DQ-1) and Daqi-2 (DQ-2) atmospheric monitoring satellites. The ACDL combines a high-spectral-resolution lidar (HSRL) at 532 nm with dual-polarization detection and an iodine vapour filter, together with an integrated path differential absorption (IPDA) channel at 1572 nm for column CO2 retrieval.^[2] DQ-1 launched in April 2022 and DQ-2 in April 2026.^[3] The satellite buses for both missions were built by the Shanghai Academy of Spaceflight Technology (SAST).

The ACDL is a spaceborne HSRL-IPDA combined instrument for simultaneous aerosol and greenhouse gas profiling from a single platform.

Sources

[1]Shanghai Institute of Optics and Fine Mechanics - Official Siteoperator marketing2026-06-10Established 1964, CAS institute, Jiading Shanghai, space-borne laser/lidar development since 2001
[2]Aerosol optical property measurement using ACDL on DQ-1 | AMT 2024peer reviewed2026-06-10Peer-reviewed: SIOM developed ACDL for DQ-1; HSRL 532nm dual-polarization + iodine vapor filter + IPDA 1572nm for CO2
[3]Daqi-1/-2 - eoPortalagency doc2026-06-10Confirms SIOM as ACDL developer; DQ-1 launched 2022-04-15; DQ-2 launched 2026-04-17

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Shanghai Institute of Optics and Fine Mechanics (SIOM/CAS). EO-Atlas, SpectraWorks B.V. https://eo-atlas.org/companies/siom (CC BY 4.0)

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@misc{eoatlas:companies:siom,
  title = {Shanghai Institute of Optics and Fine Mechanics (SIOM/CAS)},
  author = {{EO-Atlas}},
  publisher = {SpectraWorks B.V.},
  note = {CC BY 4.0},
  url = {https://eo-atlas.org/companies/siom}
}