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Integration, Testing and Performance of the Infrared Multi-Object SpectrometerThe Infrared Multi-Object Spectrometer (IRMOS) is a principle investigator-class instrument for the Kitt Peak National Observatory 2.1 m and Mayall 3.8 m telescopes. IRMOS is a near-IR (0.8 - 2.5 micron) spectrometer with low-to mid-resolving power (R = lambda/delta lambda = 300 - 3000). On the 3.8 m telescope, IRMOS produces simultaneous spectra of approximately 100 objects in its approximately 3 x 2 arcmin field of view using a commercial micro electro-mechanical systems (MEMS) digital micro-mirror device (DMD) from Texas Instruments. The multi-mirror array DMD operates as a real-time programmable slit mask. The all-reflective optical design consists of two imaging subsystems. The focal reducer images the focal plane of the telescope onto the DMD field stop, and the spectrograph images the DMD onto a large-format detector. The instrument operates at approximately 80 K, cooled by a single electro-mechanical cryocooler. The bench and all components are made from aluminum 6061-T651. There are three cryogenic mechanisms. We describe laboratory integration and test of IRMOS before shipment to Kitt Peak. We give an overview of the optical alignment technique and integration of optical, mechanical, electrical and cryogenic subsystems. We compare optical test results to model predictions of point spread function size and morphology, contrast, and stray light. We discuss some lessons learned and conclude with a prediction for performance on the telescope.
Document ID
20040034174
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Ohl, Raymond G.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Connelly, Joseph A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Boyle, Robert F.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Derro, Rebecca J.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Greenhouse, Matthew A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Madison, Timothy J.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Mentzell, J. Eric
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Sparr, Leroy M.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Hylan, Jason E.
(Swales Aerospace Beltsville, MD, United States)
Ray, Knute
(Space Telescope Science Inst. Baltimore, MD, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2003
Subject Category
Instrumentation And Photography
Meeting Information
Meeting: SPIE Astronomical Telescopes and Instrumentation
Location: Glasgow, Scotland
Country: United Kingdom
Start Date: June 21, 2004
End Date: June 25, 2004
Sponsors: International Society for Optical Engineering
Distribution Limits
Public
Copyright
Public Use Permitted.
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