Oil Spill Monitoring System Research Based On Ultraviolet Induced Fluorescence

As the oil spill accidents occur constantly,people focus more and more attention on oil spill monitoring.If the oil spill can be found at early time,it will greatly reduce the possible harm to the environment.Traditional monitoring way of sampling at present stage do not have the character of real-time.The related foreign remote instrument is very expensive,when there is only theoretical research interiorly.Aimed at solving these problems,this thesis put forward and realized a new kind of oil spill monitoring instrument.which is based on ultraviolet fluorescence analysis and compared of background value.In this thesis,on the basis of comparing many detection methods,we choose ultraviolet fluorescence method as the basic principle.Through analyzing oil's excitation wavelength and fluorescence spectral properties,we designed a fluorescence detection system which is using silicon photo-diode as detector,and LED as the light source.The signal processing part mainly consist of low power PIC single-chip computer and high precision AD converter,it brings high sensitivity.With the introduction ofcoaxial optical system,the transverse dimension of the instrument is greatly reduced,and the utilization ratio of the light source is improved.Expect of finishing the function of detecting spill oil,we do research to the common interfering substance,and propose a background comparison method to eliminate the interference.We test the instrument's basic function with the prototype,it is proved that it can perfectly finish the oil alarm function at a long distance.It has the characteristics of long distance,all-weather,real-time and low false alarm rate,low power.Beside of this test,we do a early research about detecting the thickness of oil film.