MIRS : Mid-Infrared Spectrometer

What's the MIRS !?

The Mid-Infrared Spectrometer (MIRS: Roellig et al. 1994, Roellig et al. 1996; see IRSA IRTS Bibliography Listing) is one of the four focal plane instruments on the Infrared Telescope in Space (IRTS) mission. The instrument has been constructed, tested, and calibrated in the laboratory and is presently scheduled to be launched by a Japanese expendable launch vehicle as part of the Space Flyer Unit-1 mission in early 1995. The wavelength coverage of the MIRS ranges from 4.5 to 11.7 microns, with a spectral resolution of 0.23 to 0.36 microns. With the cryogenically cooled optics of the IRTS telescope assembly, the MIRS will be able to make an extremely sensitive survey of both point-source and extended objects over an estimated 10% of the sky.


Wavelength range 4.495 - 11.703 micron
Resolution 0.23 - 0.36 micron
Size 210 x 137 x 75 mm3 (overall)
Weight 805 g
Electrical power dissipation Cold electronics : 4 mW
Warm electronics : 2.9 W
Detectors 32 Si:Bi photoconductors, Aerojet Electro Systems
Entrance Aperture 1.4 x 1.4 mm2 (0.14 x 0.14 deg2 on sky)
Integrating Amplifiers Model JF-4, IR Labs
Cold Mutiplexers CD4067B, RCA Electronics Corp.
Warm electronics package Hamamatsu Photonics K.K.
MIRS data rate 1188 bits/sec (standard operating mode)
594 bits/sec (reduced data-rate mode)

Photograph of the MIRS