Multispectral-based multipoint sampling multiparameter water quality on-line analytical system

Abstract

The invention discloses a multispectral-based multipoint sampling multiparameter water quality on-line analytical system, comprising an optical system, a waterway system and a detection control system, wherein the optical system is used for scanning the ultraviolet-visible light transmitted spectrum, and fluorescence and Raman emission spectra and the like of a water sample to be detected by adopting a multi-wavelength laser, a pulsed xenon lamp and a charge coupled device (CCD) spectrum detector and converting the scanned spectra into digital signals; and based on multipoint sampling design, the waterway system is used for enabling quantified sewage and clear water to enter into a sampling device through controlling the on and off of a water pump and a solenoid valve so as to realize the collection of the spectroscopic data, moreover, the waterway system has a function of automatically cleaning a sewage pipeline system; and an industrial personal computer is adopted as a core processing unit of the detection control system. The whole system can automatically and continuously operate and is suitable for online analysis.

Description

technical field [0001] The invention belongs to the technical field of resources and environment, and is used for online rapid detection of water quality parameters, in particular to a multi-spectrum-based multi-point sampling and multi-parameter water quality online analysis system. Background technique [0002] Comprehensive indicators of organic pollutants (such as TOC, COD, BOD, DOC, and permanganate index, etc.) reflect the overall level of water body pollution by organic matter from different aspects, and are important indicators for measuring the degree of water pollution. Quantitative assessment basis for "discharge" and "total control". In recent years, the research and development of online analyzers for water quality parameters (mainly detecting COD, TOC, etc.) have received extensive attention, and there are many types and models of their products. Based on different measurement principles, these online analyzers can basically be divided into two categories: onl...

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Problems solved by technology

Since the only part in contact with the sample to be tested in this invention patent is the sample pool, there is no water system for automatic water intake, drainage, dilution ratio, and cleaning, so it can only be used for offline detection. For occasions that require long-term continuous monitoring, such as sewage treatment The on-line monitoring of the factory, etc. is powerless; and because the emitted light of the sample in the patented optical system of the invention adopts a 360° angle receiving method with the incident light, it is necessary to use two spectral detection systems of linear array CCD and area array CCD at the same time , the optical path system is relatively complex and the cost is high; in addition, the invention patent uses eight wavelengths of 405nm, 532nm, 635nm, 650nm, 660nm, 690nm, 785nm, 808nm, 830nm for the excitation light of the emission spectrum such as excitation fluorescence and Raman The wavelength range of the laser is in the visible light or even near-infrared range. Since the excitation wavelength range required by most substances that produce fluorescence is in the ultraviolet-visible band, the laser of this invention is not conducive to the detection of fluorescence emission spectra.

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