Probe type on-line monitoring system and probe type on-line monitoring method for water petroleum pollutants

The invention relates to a probe type on-line monitoring system and a probe type on-line monitoring method for water petroleum pollutants. The system comprises an excitation light source, a detector and a control circuit board, wherein the excitation light source is used for emitting ultraviolet light which is emitted to the surface of water to be monitored at a certain angle; a light input end of the detector is provided with a light filter which is used for receiving fluorescent light reflected from the surface of the water to be monitored; and the control circuit board is connected with the detector and a control end of the excitation light source, is used for acquiring fluorescent light signals and temperature and calculating the concentration of the petroleum pollutants in the water, and is connected to an upper computer through a transmitting cable. The method comprises the following steps of: acquiring the fluorescence intensity of the surface of the water to be monitored through the excitation light source and the detector; and determining the concentration of the petroleum pollutants in the water to be detected according to the linear relation between the fluorescence intensity and the concentration of the petroleum pollutants in the water. A low-power-consumption ultraviolet light emitting diode (LED) is used as the excitation light source, the concentration is measured by the fluorescent characteristic of the petroleum pollutants, sensitivity and measurement speed are high, the steps are simple, and the system and the method can be used for monitoring petroleum pollutants in various water areas in an on-line manner.