Science. 1981 Feb 6;211(4482):580-2. doi: 10.1126/science.211.4482.580.
A submillimeter heterodyne radiometer, developed for astronomical applications, uses an optically pumped laser local oscillator and a quasi-optical Schottky diode mixer. The resultant telescope-mounted system, which has a noise temperature less than 4000 K (double sideband) and high frequency and spatial resolution, has been used to detect the J = 6 --> 5 rotational transition of carbon monoxide at 434 micrometers in the Orion molecular cloud. The measurements, when compared with previous millimeter-wave data, indicate that the broad carbon monoxide emission feature is produced by an optically thin gas whose temperature exceeds 180 K.
一台用于天文应用的亚毫米波外差辐射计采用光泵浦激光本振和准光学肖特基二极管混频器。这种安装在望远镜上的系统具有噪声温度低于 4000 K（双边带）、高频和空间分辨率高的特点，已被用于探测猎户座分子云中 434 微米处一氧化碳的 J = 6 --> 5 转动跃迁。与以前的毫米波数据相比，这些测量结果表明，宽一氧化碳发射特征是由温度超过 180 K 的光学薄气体产生的。
