抄録
The two of several difficulties in the ground-based infrared remote sensing in geothermal fields are studied theoretically. A technique filtering natural steam standing between a target area and a radiometer in geothermal fields is developed firstly by means of a simplified model.The model consists of the broad and upright target area and a plume of steam, both having uniform surface temperatures, respectively. The ratio of different fractional amounts of a plume of steam within the two adjacent or partially overlapping fields of view is used to derive an explicit formula estimating the surface temperature on a part of the target area hidden by natural steam. Next, the absorptive and emissive effects of atmospheric water vapor on the remotely sensed surface temperatures of the target area are expressed numerically in terms of the air temperature, the relative humidity and the height of the observing site as well as the observing distance.
