Ultrawide Bandwidth High Quantum Efficiency Detectors and Other Improvements to the Infrared Spatial Interferometer

超宽带高量子效率探测器和红外空间干涉仪的其他改进

• 批准号: 9321289
• 负责人: William Danchi
• 金额: $ 45.55万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-04-15 至 1997-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9321289&HistoricalAwards=false
• 关键词: Ultrawide; Bandwidth; Quantum; Efficiency; Detectors

9321289 Danchi The Infrared Spatial Interferometer developed at the University of California at Berkeley is at present the world's only multi- aperture stellar interferometer operating in the 9-12 um atmospheric window. This instrument, involving two movable 1.65 m aperture Pfund telescopes, offers unprecedented resolution in the 10 um wavelength region with an ~30 milli-arcsec (mas) resolution at the longest currently available baseline. Support is provided for upgrades to the hardware of the ISI in four areas that would significantly add to its capabilities. The first area is to extend the quantum efficiency and bandwidth with a new type of heterodyne detector. The second area is to upgrade the autoguiding system to use the near-infrared radiation from the stars rather than visible light. This would allow sufficiently short integration times for tip-tilt stabilization of the image for the stars in the present observing program. In addition, this would allow guiding on stars which radiate very weakly at visible wavelengths and yet are intense enough at 11 um to be observed with the ISI, such as some proto-planetary nebulae, OH/IR stars, and proto-stellar sources. The third area involves upgrading the delay line and correlator to match the bandwidth of the present detectors. The effective bandwidth of the correlator and delay line is about 1600 MHz, while the present detectors have bandwidths exceeding 3000 MHz. Thus a significant gain in sensitivity can be achieved through an improvement to this part of the system. The fourth area is to develop the site at Mt. Wilson to increase the baseline length in at least two directions to the maximum allowed by the site, which is about 100 m, increasing the maximum resolution to about 10 mas. ***

9321289 Danchi是加州大学伯克利分校研制的红外空间干涉仪，是目前世界上唯一工作在9-12微米大气窗口的多口径恒星干涉仪。这台仪器包括两个可移动的1.65米口径Pfund望远镜，在10微米波长范围内提供了前所未有的分辨率，在目前可用的最长基线上的分辨率为~30毫角秒(Ma)。支持在四个领域对三军情报局的硬件进行升级，这将大大增加其能力。第一个领域是利用一种新型的外差探测器来扩展量子效率和带宽。第二个领域是升级自动导航系统，使用来自恒星的近红外辐射，而不是可见光。这将为当前观测计划中的恒星提供足够短的积分时间来实现图像的倾斜稳定。此外，这将允许对在可见光波长辐射非常弱，但在11微米强到足以用ISI观察到的恒星进行指导，例如一些原行星星云、OH/IR恒星和原恒星源。第三个领域涉及升级延迟线和相关器，以匹配现有探测器的带宽。相关器和延迟线的有效带宽约为1600 MHz，而目前的探测器带宽超过3000 MHz。因此，通过改进系统的这一部分，可以显著提高灵敏度。第四个领域是开发位于Mt.威尔逊要求将至少两个方向的基线长度增加到站点允许的最大值，即约100米，将最大分辨率提高到约10毫秒。***