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Infrared interferometer spectrometer and radiometer
An Infrared interferometer spectrometer and radiometer (IRIS) is a device built into the Voyager space probe which enables the measurement of three distinct properties. The instrument itself consists of two separate instruments that together share a single large-aperture telescope system.
The Infrared interferometer spectrometer holds two functions as it can act as a thermometer and/or spectrometer. The thermometer allows for the observance and measurement of heat energy emitting from an object, and the spectrometer enables the identification of various elements, molecules, and compounds which may be present in an atmosphere and/or on the surface of a body. The separate radiometer allows for the measurement of reflected infrared, visible, and ultraviolet light off of a body.
== History ==
Early versions of the IRIS were flown on the 1960s Nimbus 3 and Nimbus 4. In 1971, an early prototype was used on Mariner 9 to examine Mars.〔
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