Fluorescent dissolved oxygen online measure device, and dissolved oxygen detection method using it

Abstract

The invention relates to the water dissolved oxygen measure field, and concretely relates to a fluorescent dissolved oxygen online measure device capable of realizing online measure in an industrial field, and a dissolved oxygen detection method using it. The method comprises the following steps: a reference light source is modulated by the square wave of a modulation module under the control of a control module and emits a reference light signal with the frequency same to the excitation light source; the reference light signal goes through an optical filter, is detected by a photoelectric detector, and is converted into an electric signal input to a control circuit board; a data processing module acquires the phase of the reference light signal; an excitation light source is modulated by the square wave of the modulation module under the control of the control module, and outputs light with the time sequence different from the reference light signal and the frequency same to the reference light signal; the light is modulated and gathered to a fluorescent screen; the fluorescent screen emits fluorescent light; and the fluorescent light goes through the optical filter and enters the photoelectric detector. The light signal goes through the photoelectric detector, and is converted into the electric signal input to the control circuit board, and the phase of the excitation light source is acquired, so the data processing module enables the dissolved oxygen concentration to be obtained through calculating according to a phase difference, thereby the device and the method have the advantages of high sensitivity, simple operation, strong practicality and the like.

Description

technical field [0001] The invention relates to the field of dissolved oxygen measurement in water bodies, in particular to a fluorescent dissolved oxygen online measurement device for on-line industrial field measurement and a method for using the device to perform dissolved oxygen. Background technique [0002] With the rapid development of industry, the water environment has also suffered more pollution. In the fields of industrial production, aquaculture, environmental monitoring, medical health and scientific research, it is necessary to know the concentration of dissolved oxygen in water in real time for detection and control. Traditional methods have been to measure dissolved oxygen using amperometric and polarographic methods. This method plays a very important role in the monitoring of dissolved oxygen in municipal and industrial wastewater. Traditional methods include iodometric method (ie winkler method) and oxygen electrode method. The iodometric method genera...

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Problems solved by technology

However, electrochemical methods require the use of membranes, electrodes, and electrolytes, which can cause many problems, and even with regular maintenance, accurate measurement results cannot be obtained

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