5.7. Microwave Sensors
5.7.1. Microwave Radiometers
Microwave radiometers detect the presence of an oil film on water by measuring the reflective interference pattern excited by the radiation from free space. The apparent emissivity factor of water is 0.4 compared to 0.8 for oil [85]. A passive microwave radiometer can detect this difference in emissivity and could therefore be used to detect oil. In addition, as the signal changes with thickness, in theory, the device could be used to measure thickness. This detection method has not been very successful in the field, however, as several environmental and oil-specific parameters must be known. In addition, the signal return is dependent on oil thickness but in a cyclical fashion. A given signal ...
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