Far-infrared imaging spectroscopy with SAFIRE on SOFIA

Benford, Dominic J.; Moseley, S. H.; Stacey, G. J.; Shafer, R. A.; Staguhn, Johannes

doi:10.1117/12.458818

Cited by 9 publications

(3 citation statements)

References 5 publications

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“…There are no plans for additional PUD arrays of ion-implanted semiconducting bolometers, but some arrays of PUDs with superconductingTransition Edge Sensors (TES) as the temperature-sensing element are being developed for use on ground-based 10 and airborne 11,12 instruments. The bolometers with TES thermistors can be multiplexed using devices such as the low power SQUID multiplexers developed at NIST.…”

Section: Current Status and Future Plansmentioning

confidence: 99%

Two bolometer arrays for far-infrared and submillimeter astronomy

Silverberg

Allen

Babu

et al. 2004

Millimeter and Submillimeter Detectors for Astronomy II

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We describe the development, construction, and testing of two 384 element arrays of ion-implanted semiconducting cryogenic bolometers designed for use in far-infrared and submillimeter cameras. These two dimensional arrays are assembled from a number of 32 element linear arrays of monolithic Pop-Up bolometer Detectors (PUD) developed at NASA/Goddard Space Flight Center. PUD technology allows the construction of large, high filling factor, arrays that make efficient use of available focal plane area in far-infrared and submillimeter astronomical instruments. Such arrays can be used to provide a significant increase in mapping speed over smaller arrays. A prototype array has been delivered and integrated into a ground-based camera, the Submillimeter High Angular Resolution Camera (SHARC II), a facility instrument at the Caltech Submillimeter Observatory (CSO). A second array has recently been delivered for integration into the High-resolution Airborne Widebandwidth Camera (HAWC), a far-infrared imaging camera for the Stratospheric Observatory for Infrared Astronomy (SOFIA). HAWC is scheduled for commissioning in 2005.

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Section: Current Status and Future Plansmentioning

confidence: 99%

Two bolometer arrays for far-infrared and submillimeter astronomy

Silverberg

Allen

Babu

et al. 2004

Millimeter and Submillimeter Detectors for Astronomy II

Self Cite

View full text Add to dashboard Cite

show abstract

“…Moreover, at variance with Fabry-Perot spectrometers (see e.g. Benford et al 2003) the FTS can be used in a differential configuration where a sky field is compared to an internal reference blackbody (as in the COBE-FIRAS instrument, Mather et al 1993; or in the Herschel-SPIRE, Griffin et al 2007), and also in a differential configuration where two sky-fields are compared, thus rejecting most of the common mode signal from the instrument, the atmosphere, the foregrounds, and the CMB (see e.g. de .…”

Section: Experimental Configurationsmentioning

confidence: 99%

Low-resolution spectroscopy of the Sunyaev-Zel’dovich effect and estimates of cluster parameters

Bernardis

Colafrancesco

D’Alessandro

et al. 2012

A&A

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Context. The Sunyaev-Zel'dovich (SZ) effect is a powerful tool for studying clusters of galaxies and cosmology. Large mm-wave telescopes are now routinely detecting and mapping the SZ effect in a number of clusters, measure their comptonisation parameter and use them as probes of the large-scale structure and evolution of the universe. Aims. We show that estimates of the physical parameters of clusters (optical depth, plasma temperature, peculiar velocity, non-thermal components etc.) obtained from ground-based multi-band SZ photometry can be significantly biased, owing to the reduced frequency coverage, to the degeneracy between the parameters and to the presence of a number of independent components larger than the number of frequencies measured. We demonstrate that low-resolution spectroscopic measurements of the SZ effect that also cover frequencies >270 GHz are effective in removing the degeneracy. Methods. We used accurate simulations of observations with lines-of-sight through clusters of galaxies with different experimental configurations (4-band photometers, 6-band photometer, multi-range differential spectrometer, full coverage spectrometers) and different intracluster plasma stratifications. Results. We find that measurements carried out with ground-based few-band photometers are biased towards high electron temperatures and low optical depths, and require coverage of high frequency and/or independent complementary observations to produce unbiased information; a differential spectrometer that covers 4 bands with a resolution of ∼6 GHz eliminates most if not all bias; full-range differential spectrometers are the ultimate resource that allows a full recovery of all parameters.

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“…[16] and [17]). A comprehensive overview of the state-of-theart in THz spectroscopy is given in [9] and early attempts of imaging spectroscopy are described in [18].…”

mentioning

confidence: 99%

Compressed Sensing in a Fully Non-Mechanical 350 GHz Imaging Setting

Augustin

Hieronymus

Jung

et al. 2015

J Infrared Milli Terahz Waves

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We investigate a single-pixel camera (SPC) that relies on non-mechanical scanning with a terahertz (THz) spatial light modulator (SLM) and Compressed Sensing (CS) for image generation. The camera is based on a 350 GHz multiplier source and a Golay cell detector. The SLM consists of a Germanium disc, which is illuminated by a halogen lamp. The light of the lamp is transmitted through a thin-film transistor (TFT) liquid crystal display (LCD). This enables the generation of light patterns on the Germanium disc, which in turn produce reflecting patterns for THz radiation. Using up to 1000 different patterns the pseudo-inverse reconstruction algorithm and the CS algorithm CoSaMP are evaluated with respect to image quality. It is shown that CS allows a reduction of the necessary measurements by a factor of three without compromising the image quality.

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Far-infrared imaging spectroscopy with SAFIRE on SOFIA

Cited by 9 publications

References 5 publications

Two bolometer arrays for far-infrared and submillimeter astronomy

Two bolometer arrays for far-infrared and submillimeter astronomy

Low-resolution spectroscopy of the Sunyaev-Zel’dovich effect and estimates of cluster parameters

Compressed Sensing in a Fully Non-Mechanical 350 GHz Imaging Setting

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