### Abstract

Achieving a Nyquist-rate direct-imaging observation using a spatial FFT interferometer, instrumental phase errors in transmission lines must be calibrated before the observation. We improved the phase-calibrating system in the Waseda FFT interferometer by increasing the number of simultaneous obtainable fringe baselines from 84 to 128, and using the algorithm of the minimum spanning tree problem in graph theory. As a result, the main-beam intensity of the interferometer became 1.6 times on average.

Original language | English |
---|---|

Pages (from-to) | 267-273 |

Number of pages | 7 |

Journal | Publications of the Astronomical Society of Japan |

Volume | 52 |

Issue number | 2 |

Publication status | Published - 2000 |

### Fingerprint

### Keywords

- Graph theory
- Instrumentation: interferometers
- Methods: data analysis
- Surveys

### ASJC Scopus subject areas

- Astronomy and Astrophysics
- Space and Planetary Science

### Cite this

*Publications of the Astronomical Society of Japan*,

*52*(2), 267-273.

**The minimum spanning tree problem in the phase calibration for the spatial FFT interferometer.** / Takeuchi, Hiroshi; Akamine, Yukinori; Fujii, Fumiyuki; Kuniyoshi, Masaya; Suemitsu, Taisei; Gotoh, Kentaro; Mizuki, Saori; Mizuno, Keiju; Suzuki, Tomoya; Fukuoka, Kohji; Tanaka, Naoki; Daishido, Tsuneaki.

Research output: Contribution to journal › Article

*Publications of the Astronomical Society of Japan*, vol. 52, no. 2, pp. 267-273.

}

TY - JOUR

T1 - The minimum spanning tree problem in the phase calibration for the spatial FFT interferometer

AU - Takeuchi, Hiroshi

AU - Akamine, Yukinori

AU - Fujii, Fumiyuki

AU - Kuniyoshi, Masaya

AU - Suemitsu, Taisei

AU - Gotoh, Kentaro

AU - Mizuki, Saori

AU - Mizuno, Keiju

AU - Suzuki, Tomoya

AU - Fukuoka, Kohji

AU - Tanaka, Naoki

AU - Daishido, Tsuneaki

PY - 2000

Y1 - 2000

N2 - Achieving a Nyquist-rate direct-imaging observation using a spatial FFT interferometer, instrumental phase errors in transmission lines must be calibrated before the observation. We improved the phase-calibrating system in the Waseda FFT interferometer by increasing the number of simultaneous obtainable fringe baselines from 84 to 128, and using the algorithm of the minimum spanning tree problem in graph theory. As a result, the main-beam intensity of the interferometer became 1.6 times on average.

AB - Achieving a Nyquist-rate direct-imaging observation using a spatial FFT interferometer, instrumental phase errors in transmission lines must be calibrated before the observation. We improved the phase-calibrating system in the Waseda FFT interferometer by increasing the number of simultaneous obtainable fringe baselines from 84 to 128, and using the algorithm of the minimum spanning tree problem in graph theory. As a result, the main-beam intensity of the interferometer became 1.6 times on average.

KW - Graph theory

KW - Instrumentation: interferometers

KW - Methods: data analysis

KW - Surveys

UR - http://www.scopus.com/inward/record.url?scp=0034348388&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0034348388&partnerID=8YFLogxK

M3 - Article

VL - 52

SP - 267

EP - 273

JO - Publication of the Astronomical Society of Japan

JF - Publication of the Astronomical Society of Japan

SN - 0004-6264

IS - 2

ER -