The design of the Fourier Transform Spectrometer for the Herschel sub-millimetre Spectral and Photometric Imaging Receiver (SPIRE) is described. This is an innovative design for a sub-millimetre spectrometer as it uses intensity beam splitters in a Mach-Zehnder configuration rather than the traditional polarising beam splitters. The instrument is required to have a resolution of 0.04 cm-1; have a relatively large field of view (2.6 arcmin circular) and cover a large wavelength range - 200 to 670 microns. These performance requirements lay stringent requirements on all aspects of the design. The details of the optical; mechanical and electrical implementation of the instrument are discussed in the light of the science and engineering requirements and laboratory testing on development models of the mechanism and control system are reported.

Imaging FTS for Herschel SPIRE

Imaging Fourier transform spectrometers (IFTS) are becoming the preferred systems for remote sensing spectral imaging applications because of their ability to provide, simultaneously, both high spatial and spectral resolution images of a scene. IFTS can be operated in either step-and-integrate or rapid-scan modes, where it is common practice to sample interferograms at equal optical path difference intervals. The step-and-integrate mode requires a translation stage with fast and precise point-to-point motion and additional external trigger circuitry for the detector focal plane array (FPA), and produces uniformly position-sampled interferograms which can be analyzed using standard FFT routines. In the rapid-scan mode, the translation stage is continuously moving and interferograms are often acquired at the frame-rate of the FPA. Since all translation stages have associated velocity errors, the resulting interferograms are sampled at non-uniform intervals of optical path difference, which requires more sophisticated analysis. This paper discusses the processing pipeline which is being developed for the analysis of the non-uniform rapid-scan data produced by the Herschel/SPIRE IFTS.

/pdf/data-processing-pipeline-for-a-time-sampled-imaging-fourier-2trvo7ouvm.pdf

Data processing pipeline for a time-sampled imaging Fourier transform spectrometer

SPECTRAL CHARACTERIZATION OF THE HERSCHEL S P I R E PHOTOMETER

Spectral characterization of the Herschel SPIRE photometer

We present the conceptual design of an imaging Fourier transform spectrometer (IFTS) for use with SCUBA-2, the second generation, wide-field, submillimeter camera currently under development for the James Clerk Maxwell Telescope (JCMT). This system, which is planned for operation in 2006, will provide simultaneous, broadband, intermediate spectral resolution imaging across both the 850 and 450 µm bands. The spectrometer will offer variable resolution with resolving powers ranging from R ~10 to 5000. When operated at low resolution, the IFTS will provide continuum measurements, well suited to spectral index mapping of molecular clouds, as well as bright nearby galaxies. The IFTS uses a folded Mach-Zehnder configuration and novel intensity beamdividers. The preliminary design, projected telescope performance and scientific impact of the IFTS are discussed. The preliminary design, novel observing modes, projected telescope performance and scientific impact of the IFTS are discussed.

https://research.uleth.ca/scuba2/documents/papers/SCUBA-2_FTS_SPIE_San_Diego.pdf

SCUBA-2 imaging Fourier transform spectrometer

The Spectral and Photometric Imaging Receiver (SPIRE) is one of three scientific instruments on the European 
Space Agency's (ESA) Herschel Space Observatory (HSO). The medium resolution spectroscopic capabilities of 
SPIRE are provided by an imaging Fourier transform spectrometer (IFTS). A software simulator of the SPIRE 
IFTS was written to create realistic data products, making use of available qualification and test data. A 
graphical user interface (GUI) provides fast and flexible access to the simulation engine. We present the design 
and integration of the simulator, as well as results from the simulator predicting the instrument performance 
under varying operational conditions.

/pdf/shifts-simulator-for-the-herschel-imaging-fourier-transform-wt1ynj5aog.pdf

SHIFTS: simulator for the Herschel imaging Fourier transform spectrometer

The SPIRE instrument for the FIRST mission will consist of a three band imaging submillimeter photometer and a two band imaging Fourier Transform Spectrometer (FTS) optimized for the 200 - 400 micrometers range, and with extended coverage out to 670 micrometers. The FTS will be used for follow-up spectroscopic studies of objects detected in photometric surveys by SPIRE and other facilities, and to perform medium resolving power (R approximately 500 at 250 micrometers ) imaging spectroscopy on galactic and nearby extra-galactic sources.

/pdf/first-spire-spectrometer-a-novel-imaging-fts-for-the-30h3eg0jmn.pdf

FIRST-SPIRE spectrometer: a novel imaging FTS for the submillimeter

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FIRST-SPIRE spectrometer: a novel imaging FTS for the submillimeter