TY  - JOUR
AU  - Charlassier, R.
AU  - Hamilton, J-Ch
AU  - Bréelle, É
AU  - Ghribi, A.
AU  - Giraud-Héraud, Y.
AU  - Kaplan, J.
AU  - Piat, M.
AU  - Prêle, D.
PY  - 2009//
TI  - An efficient phase-shifting scheme for bolometric additive interferometry
T2  - 0935-4956
JO  - ASTRONOMY AND ASTROPHYSICS REVIEW
SP  - 963
EP  - 971
VL  - 497
IS  - 3
N2  - Context. Most upcoming CMB polarization experiments will use direct imaging to search for primordial gravitational waves through the B-modes. Bolometric interferometry is an appealing alternative to direct imaging that combines the advantages of interferometry in terms of systematic effects handling and those of bolometric detectors in terms of sensitivity.Aims. We calculate the signal from a bolometric interferometer in order to investigate its sensitivity to the Stokes parameters paying particular attention to the choice of the phase shifting scheme applied to the input channels in order to modulate the signal.Methods. The signal is expressed as a linear combination of the Stokes parameter visibilities whose coefficients are functions of the phase shifts.Results. We show that the signal to noise ratio on the reconstructed visibilities can be maximized provided the fact that the phase shifting scheme is chosen in a particular way called “coherent summation of equivalent baselines”. As a result, a bolometric interferometer is competitive with an imager having the same number of horns, but only if the coherent summation of equivalent baselines is performed. We confirm our calculations using a Monte-Carlo simulation. We also discuss the impact of the uncertainties on the relative calibration between bolometers and propose a way to avoid this systematic effect.
SN  - 0935-4956
UR  - http://dx.doi.org/10.1051/0004-6361/200810306
N1  - exported from refbase (http://publi.ipev.fr/polar_references/show.php?record=236), last updated on Wed, 03 Jul 2024 19:17:34 +0200
ID  - Charlassier_etal2009
ER  -