• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Conference on millimeter, submillimeter, and far-infrared detectors and instrumentation for astronomy VI >A 4mm spectroscopic dual-beam receiver for the Robert C. Byrd green bank radio telescope
【24h】

A 4mm spectroscopic dual-beam receiver for the Robert C. Byrd green bank radio telescope

机译：罗伯特·C·伯德·格林伯德射电望远镜的4毫米光谱双光束接收器

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

With a 100-meter aperture, and recent improvements to its surface accuracy and servo system upgrades, the Robert C.Byrd Green Bank Telescope is the most sensitive telescope operating at 90 GHz. A dual-feed heterodyne receiver isdeveloped for observations at the lower frequency end of the 3-4mm atmospheric window (67 to 93 GHz). The sciencegoals are primarily molecular spectroscopic studies of star formation and astrochemistry both internal and external to theMilky Way galaxy. Studies of the structural and physical properties of star-forming, cold-cloud cores will berevolutionized with molecular spectroscopy of the deuterium and other important species within the band. Essential forspectroscopy is the ability to remove slow gain and atmospheric variations. An optical table external to the cooledcomponents rotates into the path of either beam an ambient temperature load, an offset mirror for viewing an internalcold load, or a quarter-wave plate that produces circular polarization for VLBI observations. A composite waveguidewindow comprised of HDPE, Zitex, and z-cut quartz provides a high-strength, low-loss medium for transmission of thesignal to the cooled corrugated feed horn. An orthomode transducer separates the polarization components which areamplified by low noise HEMT amplifiers. Warm W-band MMIC amplifiers are required to compensate a negative gainslope and to reduce noise contributions from the down conversion to the GBT IF frequencies. Initial science results andreceiver performance during commissioning observations will be presented along with details of the component design.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
机译：罗伯特·伯德·格林伯特（Robert C.Byrd）Green Bank望远镜具有100米的光圈，并在表面精度和伺服系统升级方面进行了最新改进，是在90 GHz频率下最灵敏的望远镜。开发了双馈外差接收器，用于在3-4mm大气窗口（67至93 GHz）的低频端进行观测。这些科学目标主要是银河系内部和外部的恒星形成和天体化学的分子光谱研究。恒星形成的冷云核的结构和物理性质的研究将通过氘和谱带内其他重要物种的分子光谱学进行革新。光谱学必不可少的是消除缓慢增益和大气变化的能力。冷却组件外部的光学平台旋转到环境温度负载，用于观察内部冷负载的偏移镜或产生用于VLBI观测的圆偏振的四分之一波片的光束路径中。由HDPE，Zitex和Z形切割石英组成的复合波导窗口可提供高强度，低损耗的介质，用于将信号传输到冷却的瓦楞进料喇叭管。正交模式换能器将极化分量分开，该极化分量被低噪声HEMT放大器放大。需要温暖的W波段MMIC放大器来补偿负的增益斜率，并减少降频转换为GBT IF频率时产生的噪声。调试观察期间的初步科学结果和接收器性能将与组件设计的详细信息一起提供。©（2012）COPYRIGHT光电仪器工程师协会（SPIE）。摘要的下载仅允许个人使用。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号