In manned space, the control of the air quality is of utmost importance for the health and wellbeing of the crew. Therefore, ESA has a long-term programme for trace gas monitoring, where SINTEF has taken part since its start in 1990 with technology selection.
ANITA (Analysing Interferometer for Ambient Air) is a multicomponent air analyser, capable of measuring more than 30 trace gases simultaneously. Therefore, it is well suited for monitoring the atmosphere of confined environments like spacecraft. The measurements apply FTIR (Fourier Transform Infra-Red) technology and novel calibration and analysis software specially developed by SINTEF. This ensures detailed, continuous, and quasi-real time information on the cabin air quality, with a unique combination of high sensitivity, accuracy, and precision. ANITA has no consumption except for power, and no waste. For the measurements, no gas pre-processing or pre-treatment is required. The air samples are taken directly from the cabin air and are returned unchanged.
ANITA1 operated successfully for 11 months onboard the ISS in 2007 and 2008, monitoring 33 gases. The ANITA2 instrument has been built in a contract between ESA, OHB and SINTEF. ANITA2 features a significant reduction in mass, volume, and power consumption, as well as further improved analysis software.
ANITA2 was launched to the ISS in December 2021, and the system is currently monitoring 39 gases in the cabin air.
ANITA2 is also a steppingstone into the future, as a technology demonstrator system for crewed stations, bases, and exploration missions, including the Gateway (planned to orbit the Moon) and to/on the Moon and Mars.
The ANITA technology is applicable to many similar tasks, like in other confined environments (diving operations, submarines), workplace monitoring (laboratories, hospitals, industry), industrial process control, releases to the environment, and environmental monitoring.
The ANITA2 core team:
- European team: System development, installation on the ISS, start-up for autonomous operation, and flight support
- ESA: Customer; also, installation on the ISS, and start-up for autonomous operation
- OHB, Germany: Prime contractor; HW, qualification, system SW, interfaces
- SINTEF, Norway: Calibration, analysis SW, system testing of gas analyses, reporting of analysis results
- NASA: ISS operations and end user of the results
- Information for updating of the gas scenarios (ISS air constituents)
- Transport to the ISS