On the effect of tilted roof reflectors in Martin–Puplett spectrometers

Schillaci, A.; Bernardis, P. de

doi:10.1016/j.infrared.2011.08.007

Cited by 7 publications

(4 citation statements)

References 10 publications

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“…With a different mechanism for the mirror motion (see e.g. Schillaci et al 2011 and references therein), the system can be implemented for operation in a cryogenic environment, suitable for space-based operation. This is the case of the SAGACE (de Bernardis et al 2010) and millimetron (Smirnov et al 2012) missions.…”

Section: Discussionmentioning

confidence: 99%

Efficient differential Fourier-transform spectrometer for precision Sunyaev-Zel’dovich effect measurements

Schillaci

D’Alessandro

Bernardis

et al. 2014

A&A

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Context. Precision measurements of the Sunyaev-Zel'dovich effect in clusters of galaxies require excellent rejection of common-mode signals and wide frequency coverage. Aims. We describe an imaging, efficient, differential Fourier transform spectrometer (FTS), optimized for measurements of faint brightness gradients at millimeter wavelengths. Methods. Our instrument is based on a Martin-Puplett interferometer (MPI) configuration. We combined two MPIs working synchronously to use the whole input power. In our implementation the observed sky field is divided into two halves along the meridian, and each half-field corresponds to one of the two input ports of the MPI. In this way, each detector in the FTS focal planes measures the difference in brightness between two sky pixels, symmetrically located with respect to the meridian. Exploiting the high commonmode rejection of the MPI, we can measure low sky brightness gradients over a high isotropic background. Results. The instrument works in the range ∼1−20 cm −1 (30−600 GHz), has a maximum spectral resolution 1/(2 OPD) = 0.063 cm −1(1.9 GHz), and an unvignetted throughput of 2.3 cm 2 sr. It occupies a volume of 0.7 × 0.7 × 0.33 m 3 and has a weight of 70 kg. This design can be implemented as a cryogenic unit to be used in space, as well as a room-temperature unit working at the focus of suborbital and ground-based mm-wave telescopes. The first in-flight test of the instrument is with the OLIMPO experiment on a stratospheric balloon; a larger implementation is being prepared for the Sardinia radio telescope.

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Section: Discussionmentioning

confidence: 99%

Efficient differential Fourier-transform spectrometer for precision Sunyaev-Zel’dovich effect measurements

Schillaci

D’Alessandro

Bernardis

et al. 2014

A&A

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“…The FTS is sensitive to a wide frequency band (say 70 -1000 GHz for SZ studies), so photon noise is the limiting factor. In fig.6 we compare what can be achieved with a warm system on a stratospheric balloon [174][175][176] (center panel) to what can be ultimately achieved with a cold system in deep space 164 (right panel). In both cases important improvements with respect to the state-of-the-art determination of cluster parameters are expected.…”

Section: Sunyaev-zeldovich Effect and Spectral Anisotropy Measurementsmentioning

confidence: 99%

The cosmic microwave background: observing directly the early universe

Bernardis

Masi

2012

Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave

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The Cosmic Microwave Background (CMB) is a relict of the early universe. Its perfect 2.725K blackbody spectrum demonstrates that the universe underwent a hot, ionized early phase; its anisotropy (about 80 µK rms) provides strong evidence for the presence of photon-matter oscillations in the primeval plasma, shaping the initial phase of the formation of structures; its polarization state (about 3 µK rms), and in particular its rotational component (less than 0.1 µK rms) might allow to study the inflation process in the very early universe, and the physics of extremely high energies, impossible to reach with accelerators. The CMB is observed by means of microwave and mm-wave telescopes, and its measurements drove the development of ultra-sensitive bolometric detectors, sophisticated modulators, and advanced cryogenic and space technologies. Here we focus on the new frontiers of CMB research: the precision measurements of its linear polarization state, at large and intermediate angular scales, and the measurement of the inverse-Compton effect of CMB photons crossing clusters of Galaxies. In this framework, we will describe the formidable experimental challenges faced by ground-based, near-space and space experiments, using large arrays of detectors. We will show that sensitivity and mapping speed improvement obtained with these arrays must be accompanied by a corresponding reduction of systematic effects (especially for CMB polarimeters), and by improved knowledge of foreground emission, to fully exploit the huge scientific potential of these missions.

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Section: Sunyaev-zeldovich Effect and Spectral Anisotropy Measurementsmentioning

confidence: 99%