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27 January 2009 Spectroscopy using the Hadamard Transform
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Abstract
The IRMOS (Infrared Multiobject Spectrometer) is a multi-object imaging dispersive spectrometer for astronomy, with a micromirror array to select desired objects. In standard operation, the mirrors are used to select multiple compact sources such that their resulting spectra do not overlap on the detector. The IRMOS can also be operated in a Hadamard mode, in which the spectra are allowed to overlap, but are modulated by opening the mirrors in many combinations to enable deconvolution of the individual spectra. This mode enables integral field spectroscopy with no penalty in sensitivity relative to the standard mode. There are minor penalties in overhead and systematics if there are sky or instrumental drifts. We explain the concept and discuss the benefits with an example observation of the Orion Trapezium using the 2.1 m telescope at Kitt Peak National Observatory.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
D. J. Fixsen, M. A. Greenhouse, J. W. MacKenty, and J. C. Mather "Spectroscopy using the Hadamard Transform", Proc. SPIE 7249, Sensors, Cameras, and Systems for Industrial/Scientific Applications X, 72490X (27 January 2009); doi: 10.1117/12.810499; https://doi.org/10.1117/12.810499
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