Ultraviolet photoelectric microsensor device for monitoring water quality on line and monitoring method

The invention discloses an ultraviolet photoelectric microsensor device used for monitoring water quality on line, which comprises an ultraviolet light source, an ultraviolet detector, a data acquisition and transmission module, a bracket and a seal cover. A water flow sample to be monitored is placed between the ultraviolet light source and the ultraviolet detector, wherein the ultraviolet light source and the ultraviolet detector are fixed on the bracket, two ends of the ultraviolet light source are connected with a power supply through a lead, and two ends of the ultraviolet detector are connected with the data acquisition and transmission module through a lead. The ultraviolet photoelectric microsenser device is characterized in that the ultraviolet light source, the ultraviolet detector and the stand are encapsulated in the seal cover, the ultraviolet detector comprises a GaN based Schottky type ultraviolet detector, and a response window of the ultraviolet detector corresponds to the center wavelength of an LED; and the ultraviolet light source consists of 3-7 ultraviolet LEDs with the wavelength covering a region ranging from 200nm to 400nm. The device has small volume and low power consumption, can timely and accurately monitor the change conditions of environmental pollution indexes (such as TOC (Total Organic Carbon), COD (Chemical Oxygen Demand) and the like), and has wide application prospect.