Ultraviolet spectrum nitrate measurement method and system based on pulse number self-adaption

Abstract

The application belongs to the technical field of optical sensing and water quality analysis, and relates to a nitrate measurement method and system based on pulse number self-adaption. The measurement method comprises the following steps: under a preset fixed integration time, a calibration mapping model between nitrate concentration and single pulse net signal is established; when a water sample to be detected is detected or a sudden change of a detection signal is detected, a xenon lamp is controlled to operate in a single pulse mode, an initial detection signal and a corresponding initial net signal are obtained; based on the initial net signal, a corresponding target pulse number is determined; within the fixed integration time, the xenon lamp is controlled to emit light pulses with the target pulse number, a spectral detector is controlled to accumulate and integrate photo-generated charges generated by each light pulse, and a total detection signal is obtained after the integration ends; based on the total detection signal, an equivalent single pulse net signal is obtained; and the equivalent single pulse net signal is input into the calibration mapping model to obtain the nitrate concentration of the water sample to be detected.

Images