The mid infrared instrument miri medium resolution spectrometer for jwst martyn wells miri ec ukatc
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The Mid-Infrared Instrument (MIRI) Medium Resolution Spectrometer for JWST Martyn Wells MIRI EC & UKATC. Spectrometer Pre Optics UKATC. Spectrometer Main Optics Netherlands. Deck (Leicester). Spectrometer Focal Plane Module (USA). Carbon Fibre Hexapod (Denmark). Imager (France).

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The mid infrared instrument miri medium resolution spectrometer for jwst martyn wells miri ec ukatc

The Mid-Infrared Instrument (MIRI) Medium Resolution Spectrometer for JWST Martyn WellsMIRI EC & UKATC


Spectrometer Pre Optics

UKATC

Spectrometer Main Optics

Netherlands

Deck (Leicester)

Spectrometer Focal Plane Module (USA)

Carbon Fibre Hexapod (Denmark)

Imager (France)

Input Optics and Calibration Unit (Belgium)



Spectrometer block diagram

SPO

SMO

Spectrometer block diagram



Dichroic passbands

Exposure C

Exposure B

Exposure A

Dichroic passbands


Spectrometer l ranges r sampling and fov
Spectrometer – l ranges, R, sampling and fov




Integral field unit optical layout
Integral Field Unit Optical Layout

Spectrometer Pre-Optics


Here are the flattened envelopes of the sliced and stacked sky images, heading off to the spectrometer collimator mirrors in the Spectrometer Main Optics (SMO)

The position of the Channel 2 collimator mirror


Here, the beam from the Channel 2 collimator is shown, heading back to one of Channel 2’s three diffraction gratings.

The position of a Channel 2 grating.


The light is dispersed by the grating. heading back to one of Channel 2’s three diffraction gratings.

Dispersion direction


...and heads back to a fold mirror. heading back to one of Channel 2’s three diffraction gratings.


...which sends it to the final, camera mirror, which is a common optical element for Channels 1 and 2 (as is the fold mirror)


The camera mirror forms the final image... common optical element for Channels 1 and 2 (as is the fold mirror)



Here comes the beam from the Channel 1 IFU, collimated and sent to one of Channel 1’s 3 gratings...


...where it is dispersed... sent to one of Channel 1’s 3 gratings...


...and sent via this fold mirror to share the last two mirrors on its way to the FPM with the spectrum from Channel 2.


Channel 2a spectra
Channel 2a spectra mirrors on its way to the FPM with the spectrum from Channel 2.

Constant

wavelength

positions


Some manufactured components
Some manufactured components mirrors on its way to the FPM with the spectrum from Channel 2.


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