• 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 >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：用于罗伯特C. Byrd Green Bank Radio望远镜的4mm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：拥有100米的光圈，最近改善其表面精度和伺服系统升级，Robert C.Byrd绿色银行望远镜是在90 GHz工作的最敏感的望远镜。双馈外偶联接收器开发，用于在3-4mm大气窗口的下频端（67至93GHz）处的观察。 ScemeNGoo主要是恒星形成和星体化学的分子光谱研究，包括星系的内部和外部。恒星形成的结构和物理性质的研究将用氘和带内的其他重要物种的分子光谱滴定化。必需的尺寸表谱是消除缓慢增益和大气变化的能力。冷却组件外部的光学桌子旋转到光束的路径中，将环境温度负载，用于观察内部载荷的偏移镜，或者为VLBI观察产生圆极化的四分之一波片。由HDPE，Zitex和Z-Cut石英组成的复合波导窗口提供了一种高强度，低损耗介质，用于将Thesignal传输到冷却的波纹饲料喇叭。矫正器换能器将由低噪声HEMT放大器的偏振分量分开。温暖的W波段MMIC放大器需要补偿负面增强率，并降低从下载转换到GBT的噪声贡献如果频率。初步科学结果和调试观察期间的初步性能以及组件设计的细节。©（2012）照片光学仪表工程师的版权协会（SPIE）。仅供个人使用的摘要下载。

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