A dispersive backend design for the 'double-Fourier' interferometer BETTII
A dispersive backend design for the 'double-Fourier' interferometer BETTII
复制标题
“双傅立叶”干涉仪 BETTII 的色散后端设计
DOI:
10.1117/12.2312138
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发表时间:
2018
期刊:
影响因子:
--
通讯作者:
J. Vila Hernandez de Lorenzo
中科院分区:
文献类型:
--
作者:
A. Dhabal;S. Rinehart;J. Mentzell;M. Rizzo;L. Mundy;D. Fixsen;T. Veach;R. Juanola;J. Vila Hernandez de Lorenzo
BETTII (Balloon Experimental Twin Telescope for Infra-red Interferometry) is designed to provide high angular resolution spectroscopic data in the far-infrared (FIR) wavelengths. The most significant limitation for BETTII is its sensitivity; obtaining spectral signal-to-noise ratio >5 in <10 minutes requires sources >13 Jy. One possible way to improve the signal-to-noise ratio (SNR) for future BETTII flights is by reducing the spectral bandwidth post beam-combination. This involves using a dispersive element to spread out a polychromatic point source PSF on the detector array, such that each pixel corresponds to a small fraction of the bandwidth. This results in a broader envelope of the interferometric fringe pattern allowing more fringes to be detected, and thereby improving the spectral SNR. Here we present the analysis and optical design of the dispersive backend, discussing the tradeoffs and how it can be combined with the existing design.
DOI:
10.1117/12.2311497
发表时间:
2018
期刊:
--
影响因子:
--
作者:
Savini G
通讯作者:
Savini G
影响因子:
3.5
作者:
Rinehart S
通讯作者:
Rinehart S