阅读说明：本技术 一种过程拉曼信号的可视化方法 (Visualization method of process Raman signal ) 是由 姚志湘 粟晖 于 2019-11-25 设计创作，主要内容包括：本发明涉及光谱测量技术领域,尤其涉及一种过程拉曼信号的可视化方法。本发明为一种过程拉曼信号的可视化方法,该方法包括以下几个步骤：1)建立数据可视化坐标；2)定义刻度线并求取可视化向量参数；3)绘制被跟踪组分可视化向量。本发明提出一种针对被关注组分信号强度的可视化方法,解决环境和背景对组分测量结果的干扰问题,帮助拉曼光谱实现准确、直观、方便的过程监测应用,该方法不需要硬件改动或者限制测量条件,也不需要进行建模等复杂操作和反推被跟踪组分含量等计算,可视化结果可以直接作为仪表设定参数用于过程系统监测。(The invention relates to the technical field of spectral measurement, in particular to a visualization method of process Raman signals. The invention relates to a visualization method of a process Raman signal, which comprises the following steps: 1) establishing a data visualization coordinate; 2) defining a scale mark and solving a visual vector parameter; 3) and drawing a tracked component visualization vector. The invention provides a visualization method for the signal intensity of a component to be focused, which solves the problem of interference of environment and background on the component measurement result and helps Raman spectrum to realize accurate, visual and convenient process monitoring application.)

1. A method for visualizing a process raman signal, comprising the steps of:

1) establishing a data visualization coordinate;

2) defining a scale mark and solving a visual vector parameter;

3) and drawing a tracked component visualization vector.

2. A method for visualizing raman signals of processes according to claim 1, characterized in that said step 1) is divided into the following steps:

a. selecting a characteristic peak of a tracked component, determining the initial position of the characteristic peak, and reading a sequence spectrum intensity value [ X ] in an interval as an X axis;

b. selecting a sequence spectrum intensity value [ Y ] corresponding to the characteristic peak from the actually measured Raman signal as a Y axis;

and c, forming a data point [ X, Y ] by using [ X ] and [ Y ], and drawing a rectangular coordinate graph which is a visual coordinate XY graph.

3. A method for visualizing raman signals of processes according to claim 1, characterized in that said step 2) is divided into the following steps:

a. will [ X ]]With background signal [ Y ] without tracked component₀]Formed series of data points [ X, Y0]Drawing on an XY diagram to obtain a characteristic peak P;

b. drawing a graduation line Tx parallel to the x-axis at the transverse vertex T of P;

c. determining a point on the x axis at the peak waist of P, and drawing a scale line Ty parallel to the y axis through the point, wherein Ty intersects C, A, B with the upper edge and the lower edge of Tx and P respectively;

d. measuring the lengths of AC and CB, and calculating the ratio of | AC |/| CB | to obtain a parameter value R of the visual vector;

e. and extending the TC y-axis to H, translating the TH downwards to the origin, wherein the translated vector T' O is a visual expression vector with the content of the tracked component being 0.

4. A method for visualizing raman signals of processes according to claim 1, characterized in that said step 3) is divided into the following steps:

a. drawing a data point [ X, Yr ] formed by the [ X ] and an actually measured spectrum signal [ Yr ] on an XY diagram to obtain an actually measured transverse peak Pr;

b, crossing Pr and Ty at two points of Ar and Br, marking Cr according to the R value, connecting the vertex Tr and the marked Cr, prolonging TrCr, and crossing Y axis at Hr;

c. and (3) translating the TrHr up and down, coinciding the Hr 'with the original point O, wherein the translated vector Tr' O is the visual expression vector Vr of the Raman intensity of the tracked component.

Technical Field

The invention relates to the technical field of spectral measurement, in particular to a visualization method of process Raman signals.

Background

The raman spectrum has the advantages of fast response, non-contact, strong characteristics and the like, and can directly reflect the change condition of the concerned components in the process by directly recording the change condition of the characteristic peak, thereby being more and more concerned by the on-line monitoring application of the process. However, the raman spectrum collects scattered light, which is easily affected by other factors such as ambient light, particle scattered light, and fluorescence, and if only the raman spectrum is modified from physical conditions such as apparatus and environment, not only hardware cost is increased, but also application scenarios are limited.

The characteristic peaks of the Raman spectrum have better independence, which is the basis for the process tracking monitoring; the direct observed fluctuations are due to baseline elevation, and since the background baseline is usually sloped, the slope will change most of the time, thus complicating the problem.

Disclosure of Invention

In order to solve the above problems in the prior art, the present invention provides a method for visualizing a process raman signal, the method comprising the following steps:

1) establishing a data visualization coordinate;

2) defining a scale mark and solving a visual vector parameter;

3) and drawing a tracked component visualization vector.

Preferably, step 1) is divided into the following steps:

a. selecting a characteristic peak of a tracked component, determining the initial position of the characteristic peak, and reading a sequence spectrum intensity value [ X ] in an interval as an X axis;

b. selecting a sequence spectrum intensity value [ Y ] corresponding to the characteristic peak from the actually measured Raman signal as a Y axis;

and c, forming a data point [ X, Y ] by using [ X ] and [ Y ], and drawing a rectangular coordinate graph which is a visual coordinate XY graph.

Preferably, step 2) is divided into the following steps:

a. drawing a series of data points [ X, Y0] formed by the [ X ] and a background signal [ Y0] without the tracked component on an XY diagram to obtain a characteristic peak P;

if the absolute intensity of the tracked component is not required to be reflected, only the relative intensity change needs to be observed, and the state with the lowest content of the tracked component can also be selected as the background, namely, the starting point time of the chemical reaction is often used as the reference background [ Y0] during process monitoring, and the component change condition at the subsequent time is observed.

b. Drawing a graduation line Tx parallel to the x-axis at the transverse vertex T of P;

c. determining a point on the x axis at the peak waist of P, and drawing a scale line Ty parallel to the y axis through the point, wherein Ty intersects C, A, B with the upper edge and the lower edge of Tx and P respectively;

d. measuring the lengths of AC and CB, and calculating the ratio of | AC |/| CB | to obtain a parameter value R of the visual vector;

e. and extending the TC y-axis to H, translating the TH downwards to the origin, wherein the translated vector T' O is a visual expression vector with the content of the tracked component being 0.

Preferably, step 3) is divided into the following steps:

a. drawing a data point [ X, Yr ] formed by the [ X ] and an actually measured spectrum signal [ Yr ] on an XY diagram to obtain an actually measured transverse peak Pr;

and b, crossing Pr and Ty at two points of Ar and Br, marking Cr according to the R value, connecting the vertex Tr and the marked Cr, prolonging TrCr, and crossing Y axis at Hr.

c. And (3) translating the TrHr up and down, coinciding the Hr 'with the original point O, wherein the translated vector Tr' O is the visual expression vector Vr of the Raman intensity of the tracked component.

The invention restrains the observation signal in the pure spectrum profile of the tracked component, because the spectrum profile can not be changed, the spectrum response contained in the profile is further induced to the base vector of the foot drop from the peak point to the base line, the vector avoids the influence of the base line slope, and the foot drop point is orthogonal projected and does not contain the response of the tracked component, namely, the lifting and the reduction of the vector are independent of the tracked component, therefore, the change of the component spectrum intensity can be reflected by the change of the vector slope degree.

Compared with the prior art, the invention has the beneficial effects that:

1. the invention provides a visualization method for the signal intensity of a component of interest, which solves the problem of interference of environment and background on a component measurement result and helps Raman spectrum to realize accurate, intuitive and convenient process monitoring application.

2. The invention provides an accurate, visual and convenient visualization process tracking expression method, which does not need hardware change or measurement condition limitation, does not need complex operations such as modeling and calculation such as reverse estimation of the content of a tracked component, and the visualization result can be directly used as an instrument setting parameter for monitoring a process system.

Drawings

FIG. 1 shows the pure Raman signals of each of the three components methanol, ethanol and propanol.

FIG. 2 shows Raman signals S1-S4 of mixed samples at different mixing ratios of methanol, ethanol and propanol.

FIG. 3 shows that S1-S4 has a wave number range of 2778cm^-1-2878cm^-1Raman signal of (a).

Fig. 4 is a schematic diagram of the visualization vector parameter R.

Fig. 5 shows the visualized vector calculation of methanol in state S1.

FIG. 6 shows the transition and expression of the four states S1-S4.

FIG. 7 is a comparison of the direct raw spectra with the effect of the present invention on tracking methanol.

FIG. 8 is a comparison of the direct raw spectra with the ethanol effect of the present invention.

FIG. 9 is a comparison of the direct raw spectra with the ethanol effect of the present invention.

FIG. 10 shows Raman spectra of 11 correction fluid samples A1-A11 and analytically pure carbon tetrachloride.

Fig. 11 shows the results of conventional raman viewing and the visualization effect of the present invention.

Detailed Description

The technical scheme of the invention is further described in detail by combining the drawings and the detailed implementation mode: