A Caltech Library Service

CASIMIR: a high resolution far-IR/submm spectrometer for airborne astronomy

Edgar, Michael L. and Emprechtinger, Martin and Karpov, Alexandre and Lin, Robert and Lin, Sean and Maiwald, Frank and Mehdi, Imran and Miller, David and Radford, Simon J. E. and Rice, Frank and Ward, John and Zmuidzinas, Jonas (2010) CASIMIR: a high resolution far-IR/submm spectrometer for airborne astronomy. In: Ground-Based and Airborne Instrumentation for Astronomy III. Proceedings of SPIE. No.7735. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 77351V. ISBN 978-0-81948-225-9.

PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


CASIMIR, the Caltech Airborne Submillimeter Interstellar Medium Investigations Receiver, is a far-infrared and submillimeter heterodyne spectrometer, being developed for the Stratospheric Observatory For Infrared Astronomy, SOFIA. CASIMIR will use newly developed superconducting-insulating-superconducting (SIS) mixers. Combined with the 2.5 m mirror of SOFIA, these detectors will allow observations with high sensitivity to be made in the frequency range from 500 GHz up to 1.4 THz. Initially, at least 5 frequency bands in this range are planned, each with a 4-8 GHz IF passband. Up to 4 frequency bands will be available on each flight and bands may be swapped readily between flights. The local oscillators for all bands are synthesized and tuner-less, using solid state multipliers. CASIMIR also uses a novel, commercial, field-programmable gate array (FPGA) based, fast Fourier transform spectrometer, with extremely high resolution, 22000 (268 kHz at 6 GHz), yielding a system resolution > 10^6. CASIMIR is extremely well suited to observe the warm, ≈ 100K, interstellar medium, particularly hydrides and water lines, in both galactic and extragalactic sources. We present an overview of the instrument, its capabilities and systems. We also describe recent progress in development of the local oscillators and present our first astronomical observations obtained with the new type of spectrometer.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Additional Information:© 2010 SPIE. The development of CASIMIR is supported by NASA/USRA SOFIA Instrument Development Fund.
Funding AgencyGrant Number
Series Name:Proceedings of SPIE
Issue or Number:7735
Record Number:CaltechAUTHORS:20110328-112535420
Persistent URL:
Official Citation:Michael L. Edgar ; Martin Emprechtinger ; Alexandre Karpov ; Robert Lin ; Sean Lin ; Frank Maiwald ; Imran Mehdi ; David Miller ; Simon J. E. Radford ; Frank Rice ; John Ward and Jonas Zmuidzinas "CASIMIR: a high resolution far-IR/submm spectrometer for airborne astronomy", Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 77351V (July 15, 2010); doi:10.1117/12.857706;
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:23134
Deposited By: Tony Diaz
Deposited On:15 Apr 2011 16:57
Last Modified:03 Oct 2019 02:43

Repository Staff Only: item control page