Pyro-atmosphere infrared sounder (PIRS) airborne demonstration of the CubeSat infrared atmospheric sounder (CIRAS)

The NASA Earth Science Technology Office (ESTO) selected the Pyro-atmosphere Infrared Sounder (PIRS) airborne demonstration as part of its FireTech program in May of 2023. Upon completion, the PIRS will be flown in an aircraft to measure temperature and water vapor profiles, and total column carbon monoxide, above and in the vicinity of wildfires to support fire prediction and suppression efforts and scientific investigations of the meteorology of wildfires. The PIRS incorporates a wide field all refractive grating spectrometer operating in the MWIR region of the spectrum with 640 spectral channels from 4.08-5.13μm. The PIRS optics assembly was developed by BAE SYSTEMS for the CubeSat Infrared Atmospheric Sounder (CIRAS) project, as part of an earlier NASA and NOAA technology maturation program in support of reducing the size of infrared sounding instruments for space applications. Through the PIRS airborne flight development and demonstration, the full performance capabilities of the CIRAS instrument will have been demonstrated and build confidence in the performance expected from a future CIRAS spaceflight mission.