Ultraviolet on-line UVT detector

The invention belongs to the technical field of ultraviolet sensors, and particularly relates to an ultraviolet on-line UVT detector comprising an ultraviolet sensor, a rotating rod and a quartz piece, wherein the quartz piece is eccentrically fixed at one end of the rotating rod, the ultraviolet sensor is arranged above the quartz piece, and the quartz piece is arranged above an ultraviolet lamp.The operation of the detector comprises the following steps of firstly rotating the quartz piece by using a high-purity quartz piece as a detection medium and calibrating the monitored value as a base value such that the detected water occupies the original space of the quartz piece, obtaining the measured value of the detected water, comparing the measured value of the detected water with the base value, determining whether the obtained ratio is within the required interval, and increasing the light intensity of the ultraviolet lamp by the frequency converter if the UVT value of the detectedwater is lower than the r