Infrared atmospheric sounding interferometer
The infrared atmospheric sounding interferometer (IASI) is a Fourier transform spectrometer based on the Michelson interferometer, associated with an integrated imaging system (IIS).
As part of the payload of the MetOp series of polar-orbiting meteorological satellites, there are currently two IASI instruments in operation: on MetOp-A (launched 19 October 2006) and on Met-Op B (launched 17 September 2012) with the third due for launch in 2017.