Overview of MIRI instrument components
The JWST Mid-Infrared Instrument (MIRI) provides four observing modes from 5 to 28.5 μm. The major pieces of instrumentation hardware necessary to support these modes include the components listed below:
- Optics and focal plane—the imager (MIRIM) and medium resolution spectrometer (MRS) are fed from a single pick-off mirror (POM).
- Filters—there are 10 filters for imaging, four filter-diaphragm combinations for coronagraphy, one neutral density filter, one ZnS-Ge double prism for the LRS mode, one opaque position for darks, and one for a lens used during ground tests.
- Coronagraph masks—one occulter is based on the classic Lyot design and there are three occulters that incorporate 4-quadrant phase masks (4QPMs).
- Spectroscopic elements—a double prism is used for the low-resolution spectrometer and there are two dichroic filter combination wheels for the medium-resolution spectrometer.
- Detectors are three impurity band conduction (Si:As IBC) devices.
- Integral field units (IFUs)—there are four IFUs for the medium resolution spectrometer.
JWST User Documentation Home
Mid-Infrared Instrument, MIRI
MIRI Coronagraphic Imaging
MIRI Coronagraph Masks
MIRI Detector Overview
MIRI Filters and Dispersers
MIRI Low Resolution Spectroscopy
MIRI Medium Resolution Spectroscopy
MIRI Observing Modes
MIRI Optics and Focal Plane
MIRI Spectroscopic Elements
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