Spectrometer
The Spectrometer of the MIRI is comprised of two parts, the SPO and the SMO. The components of the SPO are built at the UKATC, whilst the components of the SMO are built by Astron. The two parts of the spectrometer combine together using a spectrograph filter wheel which is made by MPIA. See the Dichroic/ Grating Wheel page for more information about the internal components.
The following picture shows the main optics, the far left and right arms, and the pre-optics which is the central part.
SW = Short Wavelength. LW = Long Wavelength
For a fly through how the spectrometer works, thne follow the next link to see a slide show.
Alternatively, see the project papers page to download the fly by in MicroSoft powerpoint format.
SPO
The Spectrometer pre-optics houses the the Image Slicers and the Dichroic/Grating wheels. Light enters the SPO from directly from the IOC. Light passes from the Image slicer, through a series of mirrors, to the FPM. The FPM is in the main optics (SMO). See below.
Below is a picture of the Spectrometer Pre-Optics (SPO) which houses the IFUs.
Below is a TracePro opto-mechanical model of the SPO VM model dichroic level
SMO
The Spectrometer (main optics) has two arms, each with its own Focal Plane Module. Each spectrometer arm is further divided into 2 channels
The following links lead to very high resolution pictures of the spectrometer and open in a new window.
MIRI Spectrometer with label parts
The spectrometer main optics is provided by Astron
The spectrometer pre-optics is provided by ATC (UK)