Method for continuously monitoring water quality by combining principal component analysis theory and spectrum analysis technology
A spectrum analysis and principal component analysis technology, applied in the measurement of color/spectral characteristics, etc., can solve the problems of complex calculation method, difficult to realize ultraviolet spectrum measurement method, difficult to real content, etc., to achieve energy saving, accurate and reliable measurement, The effect of fast response time
Inactive Publication Date: 2012-05-30
上海衡伟环保工程有限公司
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However, the current water quality parameters are not aimed at a single substance. Each water quality parameter is composed of multiple different substances. For example, COD may be composed of alkanes, olefins, aromatics, alcohols, phenols, ethers and other substances. Each substance has completely different absorption wavelengths for the ultraviolet spectrum. When multiple substances are mixed with each other, the various substances affect each other, and the superposition causes the entire spectrum to change. In this way, the cumulative change of each substance in water based on a single wavelength will be As a result, the calculation method that relies on a single wavelength spectrum for detailed analysis becomes extremely complicated, and it is difficult to accurately determine the true content of various substances in water, which makes it difficult to implement the ultraviolet spectrum measurement method in the actual online monitoring network
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[0074] The multi-parameter UV sensor in the HW-OEQM6000 online environmental monitoring system is used as an example to illustrate.
[0075] like Figure 7 Shown is a schematic diagram of the hardware structure of the UV sensor, including:
[0076] Iron chain hook 1, can install iron chain, it is convenient to fix the sensor to any position in each water body;
[0077] Sensor signal connection port 2;
[0078] Stainless steel shell 3, built-in analysis unit, digital processing unit, deuterium lamp and other optoelectronic boards and devices;
[0079] Ultraviolet light passes through the protective windows 4, 6;
[0080] Optical path adjustment screw 5, through which the distance from the deuterium lamp and the light receiving unit can be adjusted;
[0081] Compressed air input interface 7;
[0082] The water sample accommodating space 8 to be tested allows the water sample to be monitored to pass through the gap.
[0083] The main material of the sensor is made of stainl...
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The invention discloses a method for continuously monitoring the water quality by combining the principal component analysis theory and the spectrum analysis technology, which is to measure various water quality parameters of water samples having different concentrations by using an optical device based on the ultraviolet spectrometry. When the ultraviolet passes through various water bodies, thesubstances in the water bodies absorb the ultraviolet at different levels according to different wavelengths, concentrations and content. According to the curve of spectrum, the method combines the ultraviolet spectral measurement technology and algorithm model to calculate a plurality of parameters in the water, and the device can be directly installed in the water with no secondary pollution and simultaneously measure a plurality of parameters.
Description
technical field [0001] The invention relates to environmental monitoring technology and analysis, optical technology, embedded software and communication technology, in particular to a method for measuring various water quality parameters based on ultraviolet spectroscopy. Background technique [0002] In the current environmental online network, many water quality parameters need to be analyzed by corresponding chemical analysis methods, such as the measurement of chemical oxygen demand (COD). Then add the corresponding potassium permanganate and potassium dichromate to the container, then heat and digest, and check the color change to measure the COD value. The disadvantage of this measurement is that strong corrosive reagents are used, which will produce two Second pollution, the equipment has been working in a high temperature environment, the reliability of the equipment is difficult to be guaranteed, and the digestion time is long, it takes 2 hours, and the values of...
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IPC IPC(8): G01N21/33
Inventor 梁永刚王小泉陈文杰
Owner 上海衡伟环保工程有限公司