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Chromaticity value signal denoising and smoothing method of spectral titration method

A technology for smoothing and chromaticity values, applied in spectrometry/spectrophotometry/monochromator, chemical analysis by titration, pattern recognition in signals, etc., can solve the problem of white noise deduction that cannot be chemically titrated , Unable to achieve spectral denoising processing with high precision, unable to meet the requirements of signal denoising, etc., to achieve the effect of improving signal-to-noise ratio and accuracy

Inactive Publication Date: 2022-06-28
QINHUANGDAO WATER BEAR TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For the titration analysis of chemical spectroscopy, most of the existing technologies use the white noise generated by blank samples to approximate the measurement signal, but the actual spectral noise components will change due to various factors, and it is impossible to carry out the whole process of chemical spectroscopy titration. Effective White Noise Subtraction
In addition, although there are many denoising algorithms to choose from in the field of signal processing, a single fixed denoising algorithm cannot meet the requirements of signal denoising in different application backgrounds, and cannot achieve denoising processing of spectrally fixed signals with high precision.
Therefore, there is currently no algorithm successfully applied to the denoising calculation of the signal value of the CIELAB color homogeneous space chromaticity value in the process of chemical spectroscopic titration

Method used

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  • Chromaticity value signal denoising and smoothing method of spectral titration method
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  • Chromaticity value signal denoising and smoothing method of spectral titration method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0116] Colorimetric signal denoising and smoothing methods for spectral titration methods:

[0117] First add 100 mL of water to the reactor to adjust the zero point. In the reactor, add 100 mL of water in turn, add sulfuric acid with a concentration of 10% to adjust the pH to 1, and then add 4 drops of catechol violet indicator solution with a concentration of 0.1 g / 100 mL, with a concentration of 0.1 mol / L sodium hydroxide solution was titrated at a titration speed of 2 mL / min. Detection of lightness values ​​for a complete measurement cycle L * , red-green product index a * Hutchison-Blue Product Index b * signal value.

[0118] Set the lightness value of all measurement points in the complete measurement cycle L * , red-green product index a * Hutchison-Blue Product Index b * The signal value is the value of the signal to be processed, and the denoising and smoothing of the signal is performed according to the above method. Use the lightness value obtained a...

Embodiment 2

[0121] Colorimetric signal denoising and smoothing methods for spectral titration methods:

[0122] First add 100 mL of water to the reactor to adjust the zero point. In the reactor, add 100 mL of water in turn, add sulfuric acid with a concentration of 10% to adjust the pH to 1, and then add 4 drops of dimethyl yellow indicator solution with a concentration of 1 g / 100 mL, with a concentration of 0.1 mol / L sodium hydroxide solution was titrated at a titration speed of 2 mL / min. Detection of lightness values ​​for a complete measurement cycle L * , red-green product index a * Hutchison-Blue Product Index b * signal value.

[0123] Set the lightness value of all measurement points in the complete measurement cycle L * , red-green product index a * Hutchison-Blue Product Index b * The signal value is the value of the signal to be processed, and the denoising and smoothing of the signal is performed according to the above method. Use the lightness value obtained aft...

Embodiment 3

[0126] Colorimetric signal denoising and smoothing methods for spectral titration methods:

[0127] First add 100 mL of water to the reactor to adjust the zero point. In the reactor, add 100 mL of water in turn, add sulfuric acid with a concentration of 10% to adjust the pH to 1, and then add 4 drops of methyl red indicator solution with a concentration of 0.1 g / 100 mL, with a concentration of 0.1 mol / L. Titrate with sodium hydroxide solution at a titration rate of 2 mL / min. Detection of lightness values ​​for a complete measurement cycle L * , red-green product index a * Hutchison-Blue Product Index b * signal value.

[0128] Set the lightness value of all measurement points in the complete measurement cycle L * , red-green product index a * Hutchison-Blue Product Index b * The signal value is the value of the signal to be processed, and the denoising and smoothing of the signal is performed according to the above method. Use the lightness value obtained after s...

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Abstract

The invention belongs to the field of measurement data processing, and particularly relates to a chromatic value signal denoising and smoothing method of a spectral titration method. The invention provides a CIELAB color space signal de-noising and smoothing processing method in chemical spectral titrimetric analysis based on combination of wavelet analysis and smoothing filtering, the method utilizes a wavelet algorithm to carry out primary filtering, the resolution of the detail part of the signal is improved, and the characteristics of the signal are clearly embodied; and then, carrying out secondary filtering on the signal by using a smooth filtering algorithm to reduce the high-frequency noise content of the signal. Compared with the prior art, the interference of background noise of the CIELAB color space signal in the chemical titration process of the chemical spectrum titrator is effectively removed, the signal-to-noise ratio and the accuracy of the detection signal are improved, and a more accurate basis is provided for subsequent determination of a titration end point.

Description

technical field [0001] The invention belongs to the field of measurement data processing, in particular to a method for denoising and smoothing chromaticity value signals of a spectral titration method. Background technique [0002] CIE1976( L * a * b * ) color space method is a color evaluation method recommended by CIE (Comnission Internationale de I'Eclairage, International Commission on Illumination) in 1976, and has now become an international color measurement standard officially adopted by countries around the world. This method uses a set of numbers to describe the color, and its advantage is that the characterization parameters of the color are only related to the light source and the properties of the object. Therefore, the CIE1976 ( L * a * b * ) color space method is applied to the color characterization in chemical spectral titration analysis, and the color change in traditional titration analysis can be transformed from language description to digit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N31/16G01J3/46G06K9/00
CPCG01N21/78G01N31/16G01J3/462G06F2218/04G06F2218/08
Inventor 吕萍萍张昂王宇曦汪海波李佳琪张悦王飞
Owner QINHUANGDAO WATER BEAR TECH CO LTD