MIRI instrument focal plane - flat field
The Mid-Infrared Instrument (MIRI) on the James Webb Space Telescope (JWST) will provide direct imaging and medium resolution spectroscopy (R~ 1500 to 3000) over the wavelength range 5 - 28.5 micron, coronagraphic imaging at 10.65, 11.4, 15.5 and 23 micron, and low-resolution spectroscopy (R~100) over the wavelength range 5 - 12 micron (with some response to 14 micron).
At the top of this picture is a flat field image obtained with the MIRI OSIM (Optical Telescope Element Simulator) during the ISIM CV-3 cryo-vacuum testing in December 2015/January 2016.
This particular flat field image was measured with the OSIM diffuser hot source at 900 K.
The exposure of MIRI's two types of coronagraph, a Lyot coronagraph (top left), and three four-quadrant phase mask coronagraphs (left) are clearly shown.
Also visible are the narrow slit used for low-resolution spectroscopy, and the large field used for direct imaging.
A profile across row 800 is shown.