Astrophysics (Index)About

integral field unit

(instrument to allow a spectrograph to capture data over a 2D field)

An integral field unit (IFU) is an instrument that allows a "normal" spectrograph, i.e., with a slit opening, to capture data across a two-dimensional field. The combined instrument is called an integral field spectrograph. A typical spectrograph collects data from a line through an image (one dimension) and offers spectral data over one spatial dimension. The integral field unit rearranges points of light so that the slit includes data across a two-dimensional area, but at a relatively low spatial resolution. Spectrographs are often built so they can be used with or without the integral field unit. Among the mechanisms used:

The phrases IFU observation and IFU spectroscopy naturally refer to a spectrographic observation using an IFU.

(color,EMR,spectrum,instrument type)
Further reading:

Referenced by pages:
Anglo-Australian Telescope (AAT)
Giant Magellan Telescope (GMT)
imaging Fourier transform spectroscopy (IFTS)
imaging spectrometer
integral field spectrograph
multi-object spectrograph
William Herschel Telescope (WHT)
WIYN 3.5m Telescope