摘要
本文讨论了一种适用于研究地物波谱特性的反馈辐射计。为了消除增益变化的影响,将接收机和易受漂移影响的元件接入反馈回路,改善了系统的稳定性。还分析了系统的原理和设计,叙述了微波集成电路,给出了校正曲线和实地观察的实验数据。该设备的输出噪声起伏均方值达0.35°K±0.1°K。
A microwave feedback radiometer used for research on microwave characteristics of various materials is discussed in this paper. The receiver circuit and components which are easily influenced by drift are connected to a feedback network in order to eliminate the effect of the change of gain. Thus the stability of the radiometer is improved. The principle and design of the system are analysed; microwave integrated circuits arc described. A-calibration curve and experimental data are given in the paper. Output noise fluctuation (r. m. s) of the equipment is 0.35°K_+0.1°K.
