Multi-index water quality sensing probe based on ultraviolet visible absorption spectrum

Abstract

The invention relates to a multi-index water quality sensing probe based on an ultraviolet visible absorption spectrum. The multi-index water quality sensing probe is characterized by comprising a microprocessor, a light source, a collimated convex lens, two optical glass pieces, a mechanical optical switch, a coupled convex lens, an optical detection unit and a temperature sensor, which are arranged in a closed housing, wherein a lengthwise groove is formed in the outside of the closed housing, and is an open-ended colorimetric pond. According to the invention, a cylindrical or quadrate closed housing structure is adopted, and the microprocessor, the light source, the collimated convex lens, the two optical glass pieces, the mechanical optical switch, the coupled convex lens, the optical detection unit and the temperature sensor are integrated inside the housing only, so that the devices are compact, and the miniaturization of the integral structure can be realized; as the open-ended colorimetric pond is arranged on the closed housing, the probe can be directly placed in a medium to be measured for in-situ monitoring. The multi-index water quality sensing probe can be widely used in real-time monitoring of environment surface water, groundwater and sewage, and can be used in the fields such as industrial procedure control.

Description

technical field [0001] The invention relates to a water quality multi-index sensing probe, in particular to a water quality multi-index sensing probe based on ultraviolet-visible absorption spectrum. Background technique [0002] Water quality analysis is to measure and evaluate the quality status and change law of water resources, and provide scientific basis for the development, utilization, management and protection of water resources by the country and governments at all levels. The quality of water resources is usually described by water quality indicators, commonly used water quality indicators include water temperature, color, turbidity, conductivity, dissolved oxygen (DO, Dissolved Oxygen), chemical oxygen demand (COD, Chemical Oxygen Demand), biochemical Oxygen demand (BOD, Biochemical OxygenDemand), total organic carbon (TOC, Total Organic Carbon), nitrate nitrogen, nitrite nitrogen, total phosphorus (TP, Total Phosphorus) and other indicators. my country's nation...

AI Technical Summary

Problems solved by technology

[0004] At present, water quality analysis instruments based on absorption spectrum and mathematical model regression have commercialized mature products, but these instruments have the following technical defects: 1) Usually the instrument performs mathematical regression based on the absorption luminosity of a single wavelength or a few wavelengths at 254nm or 360nm, When the water quality composition of the water body to be tested is relatively simple, the instrument can measure accurately, but when the water quality composition is complex, the correlation between the single-wavelength absorbance and the water quality index becomes worse, and the instrument cannot reduce or eliminate the regression of non-related interfering substances in the water body. The interference of water quality indicators, especially the interference caused by turbidity; 2) The instrument only includes the measurement optical path, which cannot calibrate the instability of the light source and the influence of the pollution of the colorimetric cell on the test results, resulting in the increase of the use time of the instrument. The system error is getting bigger and bigger; 3) The instrument adopts a cabinet type, which contains complex flow paths, which cannot realize the miniaturization of the instrument, nor can it realize the in-situ monitoring of water samples

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