DUAL COLOR RADIOMETER METHOD SELECTIVELY DISCRIMINATING AGAINST A RADIANT ENERGY EMISSIVITY CHARACTERISTIC OF A PRESELECTED ATMOSPHERIC STATE

摘要

A dual color radiometer method for detection and discrimination of radiant energy emissivity characteristics of preselected atmospheric states. The dual output signals from the radiometer and corresponding to a respective first and second atmospheric spectral sample in a preselected spectral region, are differentially combined, one of the spectral sample signals being compensatorily gain changed such that the component signal intensity in both such output signals for a preselected atmospheric state are equal. Thus, the differentially combined signals provide a resultant signal indicative of an atmospheric state other than such preselected atmospheric state.