Spectral analysis method for replacing visible spectrophotometer

Abstract

The invention discloses a spectral analysis method for replacing a visible spectrophotometer. The method comprises the steps of: selecting a full spectrum light source, a color developing vessel, a white balance color plate, and placing the white balance color plate around the color developing vessel containing a color developing standard solution, using an image sensor to align the standard solution and the white balance color plate, and collecting image information to obtain an accurate RGB value of solution color of the standard solution; putting the accurate RGB value corresponding to thestandard solution into a first-order calculation formula or a second-order calculation formula, and then obtaining a value of a concentration coefficient of the solution according to a mapping method;then replacing the standard solution with a to-be-tested sample solution, obtaining an accurate RGB value of the color of the to-be-tested sample solution, and substituting into the first-order calculation formula or the second-order calculation formula known the concentration coefficient to obtain a concentration C of a to-be-tested sample. The method does not need to be isolated from an external light environment, the cleanliness requirements of the to-be-tested sample solution and a device are low, and experimental steps are simple, easy to operate, and high in accuracy.

Description

technical field [0001] The invention relates to the field of spectrum analysis, in particular to a spectrum analysis method for replacing a visible spectrophotometer. Background technique [0002] At present, most of the accurate means of water pollutant analysis are based on spectrophotometry or colorimetry in spectral analysis. Colorimetry also includes visual colorimetry or photoelectric colorimetry. The accuracy is not as high as that of spectrophotometry. Therefore, spectrophotometry using a spectrophotometer is the most widely used. Spectrophotometry uses a light source that can generate multiple wavelengths. Through a series of spectroscopic devices, a monochromatic light source with a specific wavelength is obtained. When the monochromatic light radiation passes through the measured substance solution, the amount absorbed by the substance is proportional to the concentration of the substance and the thickness of the liquid layer (optical path length). The selective ...

AI Technical Summary

Problems solved by technology

[0004] 1. It is easy to be interfered by the external light environment, the light sensor must be completely isolated from the external light source, and a proprietary light source must be used;

[0005] 2. There must be complex lenses or mirrors to form a comparison optical path to eliminate the interference of light intensity changes;

[0006] 3. The light transmission consistency and cleanliness of the colorimetric vessels such as contrasting cuvettes are high, and even the position deviation of the cuvettes will bring great interference to the test results;

[0007] 4. The transparency and cleanliness of the solution to be tested are high, and it is easily affected by the sediment particles of the sample to be tested;

[0008] 5. The analysis steps of experimental instruments are cumbersome and highly technical, requiring professional laboratory personnel to operate and maintain

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