Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Development of super broadband interferometer in FIR   We are developing the super broad band interferometer by applying the Fourier
Transform Spectrometer(FTS) to aperture synthesis system in mm and sub-mm
bands. We have constructed a compact system based on the Martin and Puplett
type Fourier Transform spectrometer (MP-FT). We call this equipment
Multi-Fourier Transform interferometer (MuFT). The band width of the system can
be extended as large as one wants contrary to the severely limited band width
of the usual interferometer due to the speed of the AD converter. The direct
detectors, e.g. bolometer, SIS video detector, can be used as the focal plane
detectors. This type of detectors have a great advantage in FIR band since they
are free from the quantum limit of the noise which limits the sensitivity of
the heterodyne detectors used in the usual interferometers. Further, the direct
detectors are able to make a large format array contrary to the heterodyne
detectors for which construction of a large format array is practically
difficult. These three characteristics make one be possible to develop high
sensitive super broad band FIR interferometer with wide field of view. In the
laboratory experiments, we have succeeded in measuring the spectroscopically
resolved 2D image of the source in 150GHz-900GHz band. The future application
of this technique to the observations from the space could open new interesting
possibilities in FIR astronomy.

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The categories of this paper are: chao-dyn
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-ex
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The categories of this paper are: quant-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: q-alg
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The categories of this paper are: dg-ga
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The categories of this paper are: funct-an
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The categories of this paper are: econ
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The categories of this paper are: chem-ph
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The categories of this paper are: supr-con
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-bio
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The categories of this paper are: bayes-an