Ibusuki area is well known for a hot spring field for recreation and sight seeing in Japan. In order to investigate geothermal feature and hot spring effuluent in this area, the authors carried out an aerial survey using a multi-spectral scanner, Bendix M2 S. Firstly, the channel 4 data of NOAA-6/AVHRR were utilized to know the wide range distribution of ground surface temperature including this area with relation to the geological aspects. There can be recognized a subtle trace of hot temperature plume, in the southern portion of Kagoshima Bay in a winter seanery. This might be a result derived from the hot spring effluent. Next, the details of geothermal feature and hot spring effluent were investigated for 5 selected test sites. Strong geotherms cannot be found in the wide area uniformely, but distributed at very localized spots. This experiment brings the authors an instruction that night observation is better to find geothermal distribution, because that geotherm stream is generally very weak in comparison with solar energy.
The decay profiles of laser induced fluorescence for a variety of materials, such as crude, light and heavy oils are studied. The profiles have been determined under laboratory condition to assess the utility in the remote characterization and identification of oil spills. Fluorescence decay time for many oils are calculated by using the method of a convolution integral on the assumption that fluorescence response function would be a double exponential form. The specificity of the “fluorescence decay spectrum” appears to be somewhat superior to that associated with the normal fluorescence spectrum. The laser fluorosensor may be of particular interest in the new form of enviromental prove-sensor. Experimental technique and results are discussed in detial.