Method and device for detecting BOD (Biochemical Oxygen Demand) in water quality by ultraviolet induced fluorescence based on secondary diffraction calibration

By establishing a quantitative BOD analysis model using a UV-induced fluorescence method based on second-order diffraction calibration, the problems of long detection cycles and unstable measurements in traditional BOD methods are solved. This enables real-time and rapid measurement and online monitoring of water quality BOD parameters, and is applicable to environmental monitoring of various water bodies.

CN120992573APending Publication Date: 2025-11-21HARBIN INST OF TECH AT WEIHAI
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Patent Information

Application Number
CN202511382279.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-09-25
Publication Date
2025-11-21

AI Technical Summary

Technical Problem

Traditional BOD detection methods have long detection cycles, large equipment size, and poor portability, making it difficult to achieve real-time online detection. Furthermore, fluorescence spectroscopy technology is greatly affected by excitation light output power and environmental changes, resulting in unstable measurement results.

Method used

A UV-induced fluorescence method based on second-order diffraction calibration was adopted. By monitoring the ratio of water fluorescence signal to second-order diffraction light signal, a quantitative BOD analysis model was established. Real-time and rapid measurement was achieved using a pulsed excitation source and a spectral detection unit. Data compensation was performed by a signal processing unit to eliminate environmental interference.

Benefits of technology

It enables non-contact, real-time, and rapid measurement of water quality BOD parameters, which can promptly reflect the water pollution status and is suitable for online monitoring of water bodies such as rivers, lakes, and oceans, reducing the impact of pollution on the ecological environment.

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Abstract

The invention belongs to the technical field of water quality detection, and discloses an ultraviolet-induced fluorescence water quality BOD (Biochemical Oxygen Demand) detection method and device based on secondary diffraction calibration. A pulse signal output by the control unit triggers the power supply module to drive the excitation light source, pulse excitation light generated by the light source is collimated by the collimating lens to form a collimated emission light beam, the collimated emission light beam is sent to the emission optical filter, excitation light of the light source is emitted through the emission optical filter, and interference light in the excitation light is filtered out; the excitation light excites the detected water body to generate a fluorescence signal, the fluorescence signal is emitted to the spectrum detection unit, the signal processing unit carries out real-time processing and analysis on spectrum data of the fluorescence signal, and real-time measurement of the BOD concentration of the water body is completed through an established BOD quantitative analysis model. By monitoring the intensity of secondary diffraction light in a water body spectrum curve, the BOD fluorescence peak intensity is compensated, and non-contact, real-time and rapid measurement of water quality BOD parameters is realized.
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