Acquisition of an Acousto-Optic Spectrometer

PI正在完成一种新的超导隧道结接收器，用于平流层痕量气体的地面测量。该接收机将在260-280 GHz范围内工作，具有高灵敏度（低接收机噪声温度）。目前还没有用于这种新接收器的单独的“后端”光谱仪。该提案寻求资金用于商业生产的双声光光谱仪，在一个单一的经济封装，有两个同时可用的部分，不同的分辨率和总带通。该光谱仪将允许灵活选择高空或低空混合比检索，或将适当物种的中中层到低平流层组合覆盖，并且完全便携，与将要使用SIS接收器的现场测量计划保持一致。除了现有老化的滤光片组光谱仪外，购买一台新的光谱仪将允许灵活地部署两台接收器，例如，一台专用于在南极或另一个偏远地点进行1至2年的全年观测。而另一个则用于一个或多个其他场址，与常规观测和UARS相关测量计划有关。

A new superconduction tunnel-junction receiver is being completed by the PI for use in ground-based measurements of stratospheric trace gases. This receiver will operate in the 260-280 GHz range with high sensitivity (low receiver noise temperature). A separate 'back-end' spectrometer for this new receiver is not currently available. This proposal seeks funding for a commercially made dual acousto-opticspectrometer in a single economical package, having two simultaneously usable sections with different resolution and total bandpass. This spectrometer would allow a flexible choice of high or low altitude mixing ratio retrievals, or a combined mid-mesospheric to low stratospheric coverage of appropriate species, and be fully portable in keeping with the intended program of field measurements in which the SIS receiver will be employed. The acquisition of a new spectrometer, in addition to the aging filter-bank spectrometer now on hand, will allow flexible deployment of both receivers - e.g., one dedicated for 1 to 2 years of round-the-year observations at the South Pole or another remote site, while the other is used at one or more other field sites in connection with regular observations and the UARS correlative measurements program.