Far-infrared intensity interferometry for high angular resolution imaging
Far-infrared intensity interferometry for high angular resolution imaging
复制标题
用于高角分辨率成像的远红外强度干涉测量
DOI：
10.1117/12.2562373
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Matsuo Hiroshi
中科院分区：
文献类型：
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作者：
安江絵翔，前田健一，松田達也，鈴木悠真;Matsuo Hiroshi
在远红外波段进行优于1毫角秒的高角分辨率天文观测，将为天文学开辟新的领域，如对原行星盘内部区域和活动星系核宽线区进行成像。我们建议在远红外波段应用强度干涉法进行孔径合成成像。20世纪50年代的Hanbury-Brown和Twiss实验为人们所熟知，但由于相位信息的丢失，孔径合成成像是不可能的。现代快速电子学使得能够使用快速光子探测器，并且光子束的延迟时间测量使得能够进行孔径合成成像。在远红外波长中使用强度干涉测量法有几个优点。首先，高灵敏度的直接探测器可用于实现来自空间的背景限制观测，而不受外差接收机的量子噪声的限制。可以记录第二光子信号，并且可以在后数据分析中进行相关分析，并且不需要光束组合光学器件。这使得空间望远镜配置灵活，望远镜数量不受限制，卫星的姿态控制可以独立进行，基线配置灵活。我们已经演示了微波延迟时间的测量，对孔径合成成像进行了一些模拟研究，并开发了太赫兹频率的快速光子探测器。强度干涉测量法的实验装置正在准备之中。讨论了地面和空间远红外强度干涉仪的前景。
High angular resolution astronomical observation in far-infrared better than one milli-arcsecond will open a new field of astronomy, such as imaging inner region of protoplanetary disk and broad line region of active galactic nuclei. We propose to apply intensity interferometry in far-infrared wavelengths for aperture synthesis imaging. Intensity interferometry is known by the Hanbury-Brown and Twiss experiment in 1950’s, but aperture synthesis imaging was not possible because of missing phase information. Modern fast electronics enable a usage of fast photon detectors, and delay time measurements of photon bunches enable aperture synthesis imaging. There are several merits using intensity interferometry in far-infrared wavelengths. First, high sensitivity direct detectors can be used to realize background limited observations from space, not limited by quantum noise of heterodyne receivers. Second photon signal can be recorded, and correlation analysis can be made in post data analysis, and there is no need for beam combining optics. These lead to flexible telescope configuration in space; number of telescopes is not limited, attitude control of satellite can be independent, and baseline configuration is flexible. We have demonstrated the delay time measurements in microwave, some simulation studies for aperture synthesis imaging were made and developing fast photon detectors in terahertz frequencies. Experimental setup for intensity interferometry is being prepared. Prospects of far-infrared intensity interferometers on ground and in space are discussed.