# IKFS-2 Infrared Fourier Spectrometer
*sensor . products*

Infrared Fourier spectrometer flown on Meteor-M N2-4 for atmospheric temperature, humidity, ozone and trace-gas sounding context.

## Specifications
- **product status**: operational
- **deployment context**: orbital
- **manufacturer**: npo-vniiem
- **sensor**: {"instrument_family":"passive-optical","measurement_principle":"passive","spec_disclosure":"undisclosed"}
- **entity type**: sensor
- **last verified date**: 2026-06-16
- **verified by**: agency-doc
- **claim status**: agency-sourced
- **provider**: npo-vniiem
- **attributes**: {"kind":"sensor","product_status":"operational","deployment_context":"orbital","manufacturer":"npo-vniiem","description":"Infrared Fourier spectrometer flown on Meteor-M N2-4 for atmospheric temperature, humidity, ozone and trace-gas sounding context.","sensor":"{\"instrument_family\":\"passive-optical\",\"measurement_principle\":\"passive\",\"spec_disclosure\":\"undisclosed\"}"}

## Editorial
IKFS-2 is a nadir-viewing infrared Fourier-transform spectrometer carried on the Meteor-M meteorological satellite series, measuring emitted thermal radiation across the 5.0 to 15.0 micrometer range (665-2000 cm-1) in 2670 spectral channels.[^wmo-oscar-ikfs2][^eoportal-meteor-m2] Its cross-track scanning geometry produces 30 steps per scan line across a contiguous swath of 1000 km, with coverage extending to approximately 2500 km when gaps between scan positions are included.[^wmo-oscar-ikfs2] Spatial resolution at nadir is 35 km.[^wmo-oscar-ikfs2]

Spectral resolution is 0.5 cm-1 unapodised.[^wmo-oscar-ikfs2] Radiometric sensitivity is characterised by a noise-equivalent differential temperature of 0.5 K at 280 K.[^wmo-oscar-ikfs2]

The fine spectral resolution of the instrument enables vertical profiling of atmospheric temperature, humidity, ozone, and trace gases from nadir-viewing geometry. IKFS-2 first flew on Meteor-M N2 in July 2014, with planned utilisation through 2040.[^wmo-oscar-ikfs2] The instrument has been described in the peer-reviewed literature based on operational data from the Meteor-M N2 mission.[^springer-ikfs2-2018]

## Compositional position
- meteor-m-n2-4 (missions) --[mission_payloads]--> IKFS-2 Infrared Fourier Spectrometer
- meteor-m-n2-3 (missions) --[mission_payloads]--> IKFS-2 Infrared Fourier Spectrometer

## Sources
- [wmo-oscar-ikfs2] | WMO OSCAR - Instrument Details: IKFS-2 | https://space.oscar.wmo.int/instruments/view/ikfs_2 | tier=agency-doc | accessed=2026-06-16
- [eoportal-meteor-m2] | Meteor-M2 Meteorological Mission - eoPortal Directory | https://directory.eoportal.org/satellite-missions/meteor-m-2 | tier=community | accessed=2026-06-16
- [springer-ikfs2-2018] | The IKFS-2 Infrared Fourier-Transform Spectrometer Operating Onboard the Meteor-M No.2 Satellite, Izvestiya Atmospheric and Oceanic Physics, 2018 | https://link.springer.com/article/10.1134/S0001433818090153 | tier=peer-reviewed | accessed=2026-06-16
- [wmo-oscar-meteor-m-n2-4] | WMO OSCAR - Satellite: Meteor-M N2-4 | https://space.oscar.wmo.int/satellites/view/meteor_m_n2_4 | tier=agency-doc | accessed=2026-06-16

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Source: https://eo-atlas.org/products/sensor/ikfs-2
Maintainer: SpectraWorks B.V. (CC-BY 4.0)