CN112945895A - Online judgment method for absorption end point of typical modified double-base propellant absorbent - Google Patents
Online judgment method for absorption end point of typical modified double-base propellant absorbent Download PDFInfo
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- 238000010521 absorption reaction Methods 0.000 title claims abstract description 101
- 238000000034 method Methods 0.000 title claims abstract description 83
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- 230000002745 absorbent Effects 0.000 title claims description 18
- 239000002250 absorbent Substances 0.000 title claims description 18
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- 229920001220 nitrocellulos Polymers 0.000 claims description 26
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- 239000000523 sample Substances 0.000 claims description 14
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- XTFIVUDBNACUBN-UHFFFAOYSA-N 1,3,5-trinitro-1,3,5-triazinane Chemical compound [O-][N+](=O)N1CN([N+]([O-])=O)CN([N+]([O-])=O)C1 XTFIVUDBNACUBN-UHFFFAOYSA-N 0.000 description 18
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- SNIOPGDIGTZGOP-UHFFFAOYSA-N Nitroglycerin Chemical compound [O-][N+](=O)OCC(O[N+]([O-])=O)CO[N+]([O-])=O SNIOPGDIGTZGOP-UHFFFAOYSA-N 0.000 description 3
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- FJWGYAHXMCUOOM-QHOUIDNNSA-N [(2s,3r,4s,5r,6r)-2-[(2r,3r,4s,5r,6s)-4,5-dinitrooxy-2-(nitrooxymethyl)-6-[(2r,3r,4s,5r,6s)-4,5,6-trinitrooxy-2-(nitrooxymethyl)oxan-3-yl]oxyoxan-3-yl]oxy-3,5-dinitrooxy-6-(nitrooxymethyl)oxan-4-yl] nitrate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O)O[C@H]1[C@@H]([C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@@H](CO[N+]([O-])=O)O1)O[N+]([O-])=O)CO[N+](=O)[O-])[C@@H]1[C@@H](CO[N+]([O-])=O)O[C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O FJWGYAHXMCUOOM-QHOUIDNNSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3577—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing liquids, e.g. polluted water
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/38—Diluting, dispersing or mixing samples
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/359—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using near infrared light
Abstract
The invention discloses an online determination method for an absorption end point of a typical modified double-base propellant absorption medicine. Firstly, respectively collecting near infrared spectra of NC and high-energy explosives with different concentrations, determining a typical characteristic peak, and selecting a characteristic wave band as a basis for calculating the standard deviation of a moving window; then setting a workflow for repeated sampling in the absorption process; simulating the absorption process, and carrying out real-time and online acquisition on the mixed condition in the absorption process; and finally, at different mixing time points, selecting continuous n spectra for calculation each time, calculating the real-time difference and standard deviation between the whole process and the near infrared spectrum of the characteristic peak of the main component by an MBSD algorithm, and judging the absorption end point. The invention selects the near infrared spectrum characteristic peak of each component of the absorption medicine and prolongs the duration of the mixing process, comprehensively reflects the mixing uniformity change condition of the absorption process and accurately judges the absorption end point, thereby providing comprehensive and reasonable basis for the actual production of the absorption medicine.
Description
Technical Field
The invention relates to an on-line determination method for an absorption end point of a typical modified biradical propellant absorption medicine, and belongs to the technical field of propellant detection processes.
Background
Typical modified biradical propellants are propellants consisting of Nitrocellulose (NC), Nitroglycerine (NG), aluminum powder, hexogen (RDX), water, and the like. The preparation process mainly comprises the working procedures of absorption, mixing, calendering, drying and the like. Absorption means that nitrocellulose is suspended in a dispersion medium, and all components of the double-base propellant are uniformly, quantitatively and accurately mixed together by a certain dispersion method and are firmly combined. The higher the uniformity of the absorbed medicine, the better the absorption effect. The absorption effect of the absorption medicine directly plays a decisive role in whether the propellant finished product can reach the theoretical performance of the formula design.
In the current propellant production process, operators with abundant experience are mainly relied on experience to subjectively judge whether the absorbed medicines are uniformly mixed in the production process, and the process of the production process is determined according to the judgment result. However, the biggest problem of subjective judgment is that the uniformity of the mixture of the absorbed medicines cannot be accurately reflected, and large errors are likely to exist, so that the absorption effects of the absorbed medicines are different, and the propellant finished product is difficult to maintain stable performance. In order to ensure the absorption quality of the propellant, the uniformity of the absorbed medicine is generally detected by a traditional wet chemical method in the production process. Specifically, the contents of the main components RDX, NC and NG of the propellant are analyzed one by methods such as High Performance Liquid Chromatography (HPLC), Gas Chromatography (GC), ultraviolet-visible spectrophotometry, dissolution-weighing method and the like, and the deviation of the contents is judged. However, this off-line detection method also has many disadvantages: (1) the production process needs to be interrupted in the sampling process, and potential safety hazards exist; (2) the manual sampling is carried out on the production line, and then the sample is sent to a laboratory for inspection, so that the time consumption is long, and the defects of environmental pollution and the like exist; (3) the integral uniformity of a large amount of absorption medicines in a macroscopic view can only be judged, and the uniformity of the absorption medicines cannot be judged in a microscopic view; (4) the requirements of continuous and automatic production of the solid propellant on real-time, safe and environment-friendly production quality control methods cannot be met.
Therefore, researchers always seek a rapid, online and accurate method for detecting the absorption uniformity of propellant absorption medicine to judge the absorption effect and guide the quality and stability control of the propellant. The united states Food and Drug Administration (FDA) released a draft for the application of process analysis technology in 2004 and suggested the application of near infrared spectroscopy (NIR) technology as a fast, safe, and environmentally friendly on-line detection technology to the quality control of food and drug production line production processes to improve the real-time correction capability to the production line to ensure product quality. Therefore, whether the near infrared spectrum analysis technology is used for detecting the content and the mixing uniformity of the main components of the absorbed medicine on line or not can provide key technical support for ensuring the good reliability and reproducibility of the quality of the solid propellant produced continuously and automatically.
Modern NIR analysis technology can extract information in NIR spectrums of various components by means of a chemometric method, establish a quantitative analysis model with reliable and stable performance, participate in quantitative analysis under the condition that medicines are not damaged and a plurality of components coexist, and is very convenient. In addition, near infrared light has excellent transmission performance in conventional optical fiber materials, and NIR spectral information can be transmitted in a long distance through optical fibers, so that the NIR analysis technology is widely applied and rapidly developed in recent years. Zhouyu et al (1 Zhouyu, Deng, Guo Xiao, et al.) near infrared on-line monitoring modified double-base absorbent drug mixing uniformity research [ J ] Bing engineering report, 2014,35(07): 977) 981 ] proposed a method for monitoring real-time uniformity change by adopting a micro near infrared spectrometer to collect spectra of absorbent drugs in continuous stirring dynamic state and combining a moving window standard deviation method to perform quantitative analysis on spectral differences. The method specifically comprises the steps of quantitatively presenting the difference between spectra at different moments by adopting a moving window standard deviation (MBSD) method to reflect the change of the mixing uniformity of the double-base modified absorbent in real time, enabling a material system to undergo a complete mixing process of 5 continuous stages of stillness, stirring start, mixing uniformity, stirring stop and stillness recovery, collecting the near infrared spectrum of the mixing process, obtaining the relation of the change of standard deviation (S) along with time by utilizing an MBSD algorithm, and enabling the whole experiment process to be about 200S. When the time reaches 121S, the S value is basically continuously stabilized around a certain minimum value, and the whole mixing of the sample system is considered to be gradually close to a more ideal uniform state in the time period.
Although the MBSD algorithm can effectively reflect the system change in the mixing process in real time, the above experiment has the following two problems in the operation process and the like: (1) in the experiment, the deviation processing is carried out on three continuous spectral lines by utilizing an MBSD algorithm in the whole spectral information and the whole spectral band range, the experimental environment is that a large amount of water exists, the existence of a large amount of liquid water peaks can cover the characteristic peaks of the main components of the absorbent, the condition that the characteristic peaks of the absorbent change along with the mixing process cannot be represented, the characteristic peak bands of the components such as RDX and NC cannot be reflected, and the error brought to the experimental result cannot be caused, so the condition that the mixing uniformity change of the components such as RDX and NC in the absorbent is difficult to be reflected comprehensively; (2) the experiment only draws the change situation of S along with time according to the spectrum difference situation within 200S, and judges that the absorption end point is reached after about 121S, and the absorption medicine produced in an actual propellant factory is generally more than 2h, so the time of the absorption end point in the experiment is far from the actual situation, the actual situation of the absorption process is difficult to objectively reflect, and the obtained rule is not enough to support the actual application.
Disclosure of Invention
Aiming at the defects that the mixing uniformity of the absorption medicine is difficult to detect, the absorption end point is difficult to judge in real time and the like, the invention provides an online judging method of the absorption end point of the typical modified double-base propellant absorption medicine. The method is based on a moving window standard deviation method of a near infrared reflection spectrum characteristic peak of a main component of a typical modified double-base propellant absorption medicine, so that the mixing uniformity of the absorption medicine is represented on line in real time, and the absorption end point is judged.
The technical solution of the invention is as follows:
firstly, respectively collecting near infrared spectrums of two components by changing the proportion of NC and high-energy explosive in water, thereby analyzing a near infrared spectrum typical characteristic peak capable of representing the two components, selecting a plurality of characteristic wave bands and using the characteristic wave bands as a basis for calculating the standard deviation of a moving window; then, a workflow capable of continuously acquiring the spectrums and performing deviation calculation on the continuous n spectrums is set in computer analysis software matched with the near-infrared spectrum analyzer, so that the absorption medicine mixing process takes the workflow as an operation program, and the spectrums are acquired and the deviation is calculated in real time and on line, so as to represent the mixing uniformity of the absorption medicine; preparing a typical modified double-base propellant absorption medicine sample according to a proportion, loading and stirring to simulate an absorption process, inserting a light probe into a mixed system, and collecting the mixed condition of the absorption process in real time; and finally, on the basis of mixing for a certain time, selecting continuous n spectra for calculation each time, and sequentially iterating the earliest one of the selected spectra by using the newly added spectra. And calculating real-time difference and standard deviation between the whole process and the near infrared spectrum of the characteristic peak of the main component by using an MBSD algorithm to comprehensively analyze and judge the absorption end point so as to judge the mixing uniformity. The method specifically comprises the following steps:
firstly, respectively collecting near infrared spectrums of two components by changing the proportion of NC and high-energy explosives in water, analyzing typical characteristic peaks of the near infrared spectrums which can represent the two components, selecting a plurality of characteristic wave bands, and using the characteristic wave bands as a basis for calculating the standard deviation of a moving window;
secondly, a workflow capable of continuously acquiring the spectrums and performing deviation calculation on the continuous n spectrums is set in computer analysis software matched with the near infrared spectrum analyzer, so that the spectrums are acquired and the deviation is calculated in real time on line by taking the workflow as an operation program in the absorption medicine mixing process, and the mixing uniformity of the absorption medicines is represented;
thirdly, preparing a typical modified double-base propellant absorption drug sample according to a proportion, loading and stirring, simulating an absorption process, inserting an optical fiber probe into a mixed system, and collecting a real-time near infrared spectrum of a mixed condition in the absorption process;
fourthly, on the basis of mixing for a certain time, selecting n continuous spectrums each time for calculation, sequentially iterating one of the selected spectrums with the earliest time by using the newly added spectrums, calculating the real-time difference and standard deviation between the whole process and the near infrared spectrums of the characteristic peaks of the main components by using an MBSD algorithm to comprehensively analyze and judge an absorption end point so as to judge the mixing uniformity, and finally judging that the absorption reaches the end point when the average deviation in the absorption process is wholly reduced and fluctuates near a certain minimum value and no longer changes in a large range; the specific algorithm for the MBSD is shown in the following formula 1: xijIs the absorbance of the jth spectrum at wavelength i point; xiAverage absorbance values for selected n consecutive spectra at wavelength i points; m is the total number of the selected wavelengths; s is the average of the standard deviations of the corresponding absorbances at the selected number m of wavelengths,
in the first step, the mass fraction of NC in water is 0.1-15%.
In the first step, the high explosive is one conventionally used in the art, such as RDX, HMX, CL-20, and the like. The mass fraction of the high-energy explosive in water is 0.1-30%.
In the first step, the characteristic waveband of RDX is 4000-4730 cm-1And 5750-6250 cm-1(ii) a The characteristic wave band of NC is 5400-6000 cm-1And 8000-9000 cm-1。
In the second step, n is more than or equal to 3, and the higher the value of n is, the more accurate the analysis result is.
And in the third step, the environmental temperature of sample adding is 55-60 ℃, and the stirring time is 0.5-5 h.
Compared with the prior art, the invention has the following advantages:
(1) the method adopts near infrared reflection spectroscopy to judge the absorption end point of the typical modified biradical propellant in real time on line. The detection process is simple and rapid, online rapid analysis can be performed, samples are not consumed, no pollution is caused to the environment, the method can be used for production and application in an actual factory, the whole reaction process only needs to continuously collect the near infrared spectrum of the absorption drug, the detection time is greatly shortened, and great safety and reliability are realized;
(2) on the basis of researching and defining characteristic peaks and corresponding wave bands of main components of typical modified double-base propellant absorbed medicines, continuous spectrum acquisition is carried out on the absorption process, the absorption process of the actual absorbed medicines is combined, the duration time of the mixing process is prolonged, the mixing uniformity change condition of the absorption process is conveniently and comprehensively reflected, the absorption end point is more accurately judged, and the result is closer to the actual production experience value;
(3) the invention adopts a moving window standard deviation method to quantitatively present the difference between the spectra at different moments to reflect the change of the absorption effect of the typical modified double-base absorbent in real time, selects n continuous spectra for calculation, and guides the practical application more scientifically. The standard deviation algorithm of the moving window is simple and stable, the complexity of conventional near-infrared quantitative analysis is avoided, and the model is stable and reliable.
Drawings
Fig. 1 is an absorption process resampling flow chart (workflow).
FIG. 2 shows RDX + H containing 1-15.5% of RDX2Near infrared spectrum of O system.
FIG. 3 shows RDX + H containing 1-15.5% of RDX2And selecting a graph for the near infrared spectrum modeling interval of the O system.
FIG. 4 is an RDX internal cross-check regression plot.
FIG. 5 shows NC + H containing 0.17 to 4.76% NC2Near infrared spectrum of O system.
FIG. 6 shows NC + H containing 0.17 to 4.76% NC2And selecting a graph for the near infrared spectrum modeling interval of the O system.
FIG. 7 is an NC internal cross-check regression graph.
FIG. 8 is a graph of the NIR spectra of example 1 taken over time for the absorbent at 58 ℃.
FIG. 9 is a graph of the mean deviation of 3 consecutive spectral lines of the absorbent in example 1 at 58 ℃ as a function of time.
FIG. 10 is a graph of a repeat experiment showing the mean deviation of 3 consecutive spectral lines of an absorbent at 58 ℃ as a function of time.
Detailed Description
The present invention will be described in more detail with reference to the following examples and the accompanying drawings.
Example 1
The first step is as follows: respectively collecting the near infrared spectra of two components by changing the proportion of NC and RDX in water, wherein the proportion of NC is set to be 0.17-4.76%, and the proportion of RDX is set to be 1-15.5%, so as to analyze typical characteristic peaks of the near infrared spectra capable of representing the two components, select a plurality of characteristic wave bands, and use the characteristic wave bands as the basis for calculating the standard deviation of a moving window;
secondly, a workflow capable of continuously acquiring spectrums and calculating deviation of 3 continuous spectrums is set in computer analysis software matched with the near infrared spectrum analyzer, so that the absorption medicine mixing process takes the workflow as an operation program, the spectrums are acquired and the deviation is calculated in real time and on line, and the mixing uniformity of the absorption medicine is represented, wherein the workflow is shown in figure 1;
thirdly, preparing a typical modified double-base propellant absorbent sample according to a proportion, loading and stirring, simulating an absorption process by setting the environment temperature of the absorbent to be 58 ℃ and the stirring time to be 3 hours, inserting an optical fiber probe into a mixed system, and collecting the real-time near infrared spectrum of the mixed condition in the absorption process;
and fourthly, on the basis of mixing for a certain time, selecting 3 continuous spectrums each time for calculation, and sequentially iterating the earliest one of the selected spectrums by using the newly added spectrums. The absorption endpoint is comprehensively analyzed and judged through real-time difference and standard deviation between the whole process obtained by an MBSD algorithm and near infrared spectra of characteristic peaks of main components, and then the absorption endpoint is judged, so that the mixing uniformity is judged to have a tendency of overall reduction of average deviation in the absorption process, finally, the mixing uniformity fluctuates around a certain minimum value, and when the change in a large range does not occur any more, the absorption endpoint can be considered to be reached.
Example 2
The first step is as follows: respectively collecting the near infrared spectra of two components by changing the proportion of NC and RDX in water, wherein the proportion of NC is set to be 0.17-4.76%, and the proportion of RDX is set to be 1-15.5%, so as to analyze typical characteristic peaks of the near infrared spectra capable of representing the two components, select a plurality of characteristic wave bands, and use the characteristic wave bands as the basis for calculating the standard deviation of a moving window;
secondly, a workflow capable of continuously acquiring the spectrums and calculating the deviation of the continuous 4 spectrums is set in computer analysis software matched with the near-infrared spectrum analyzer, so that the absorption medicine mixing process takes the workflow as an operation program, and the spectrums are acquired and the deviation is calculated in real time and on line, so as to represent the mixing uniformity of the absorption medicine;
thirdly, preparing a typical modified double-base propellant absorbent sample according to a proportion, loading and stirring, simulating an absorption process by setting the environment temperature of the absorbent to be 58 ℃ and the stirring time to be 3 hours, inserting an optical fiber probe into a mixed system, and collecting the real-time near infrared spectrum of the mixed condition in the absorption process;
and fourthly, on the basis of mixing for a certain time, selecting 4 continuous spectrums each time for calculation, and sequentially iterating the earliest one of the selected spectrums by using the newly added spectrums. The absorption endpoint is comprehensively analyzed and judged through real-time difference and standard deviation between the whole process obtained by an MBSD algorithm and near infrared spectra of characteristic peaks of main components, and then the absorption endpoint is judged, so that the mixing uniformity is judged to have a tendency of overall reduction of average deviation in the absorption process, finally, the mixing uniformity fluctuates around a certain minimum value, and when the change in a large range does not occur any more, the absorption endpoint can be considered to be reached.
The relationship between wave number and absorbance of each component of the absorbent is shown in FIGS. 2 and 5, and by changing the ratio of the components, collecting multiple near infrared spectra, and establishing the relationship between the components and characteristic bands with the help of reasonable mathematical model, it can be found that the content of NC and RDX and the near infrared spectraObvious corresponding relation exists among characteristic peaks, wherein RDX is 4000-4730 cm-1、5750～6250cm-1Two intervals have obvious characteristic peaks which can reflect the content change of the component, and as can be seen from figure 4, through internal interactive verification, R of the RDX modelcv 2About 0.9929, which proved to have a good linear relationship; NC is 5400-6000 cm-1、8000～9000cm-1Two intervals have obvious characteristic peaks which can reflect the content change of the component, and as can be seen from figure 7, through internal interactive verification, R of the NC modelcv 2About 0.9885, which proved to have a good linear relationship. The change condition of the absorption process can be well represented by taking the characteristic peaks of all components in the absorption medicine as a basis, so that the characteristic peaks of the four characteristic intervals can be applied to judgment of mixing uniformity and an absorption end point, a near infrared spectrum of hours is collected, the spectrum standard deviation of the characteristic wave bands of all the components shows an obvious reduction trend after 150min, and the absorption end point is more accurately judged due to fluctuation near a smaller numerical value. As can be seen from the comparison between fig. 9 and fig. 10, even if the experiments are repeated under the same conditions, the standard deviation is different in the initial period of time, that is, the materials such as NC and RDX are difficult to be mixed in a uniform state in the initial stage of the absorption process, the absorption endpoint cannot be accurately determined only by using 200s as the time of the absorption process, and the actual absorption process cannot be uniformly mixed in a short time, so that the change trend of the standard deviation obtained only by using about 200s is accidental, and the change trend is not enough to indicate that the absorption process reaches the endpoint, and whether the absorption effect is good or not cannot be reasonably determined. The invention respectively carries out comprehensive optimization from the trend of the near infrared spectrum characteristic peak of the absorption medicine component in the absorption process spectrogram and the absorption process lasting for a plurality of hours, so that the judgment result of the absorption end point of the absorption medicine is more reliable, and comprehensive and reasonable basis is provided for the production of the absorption medicine in an actual factory.
TABLE 1 characteristic peak wave number range of absorption medicine component
Claims (8)
1. The typical method for judging the absorption end point of the modified biradical propellant absorbent is characterized by comprising the following steps:
firstly, respectively collecting near infrared spectrums of nitrocellulose and high-energy explosive by changing the proportion of the nitrocellulose and the high-energy explosive in water, analyzing typical characteristic peaks of the near infrared spectrums of the nitrocellulose and the high-energy explosive, selecting a plurality of characteristic wave bands, and using the characteristic wave bands as a basis for calculating the standard deviation of a moving window;
secondly, a workflow capable of continuously acquiring the spectrums and performing deviation calculation on the continuous n spectrums is set in computer analysis software matched with the near infrared spectrum analyzer, so that the spectrums are acquired and the deviation is calculated in real time on line by taking the workflow as an operation program in the absorption medicine mixing process, and the mixing uniformity of the absorption medicines is represented;
thirdly, preparing a typical modified double-base propellant absorption drug sample according to a proportion, loading and stirring, simulating an absorption process, inserting an optical fiber probe into a mixed system, and collecting a real-time near infrared spectrum of a mixed condition in the absorption process;
fourthly, on the basis of mixing for a certain time, selecting n continuous spectrums each time for calculation, sequentially iterating one of the selected spectrums with the earliest time by using the newly added spectrums, calculating the real-time difference and standard deviation between the whole process and the near infrared spectrums of the characteristic peaks of the main components by using an MBSD algorithm to comprehensively analyze and judge an absorption end point so as to judge the mixing uniformity, and finally judging that the absorption reaches the end point when the average deviation in the absorption process is wholly reduced and fluctuates near a certain minimum value and no longer changes in a large range; the specific algorithm for the MBSD is shown in the following formula 1: xijIs the absorbance of the jth spectrum at wavelength i point; xiAverage absorbance values for selected n consecutive spectra at wavelength i points; m is the total number of the selected wavelengths; s is the average of the standard deviations of the corresponding absorbances at the selected number m of wavelengths,
2. the on-line determination method according to claim 1, wherein in the first step, the mass fraction of nitrocellulose in water is 0.1 to 15%.
3. The on-line judging method according to claim 1, wherein in the first step, the high explosive is RDX, HMX, CL-20.
4. The on-line judgment method according to claim 1, wherein the mass fraction of the high explosive in water in the first step is 0.1 to 30%.
5. The on-line determination method according to claim 3, wherein in the first step, the characteristic band of RDX is 4000 to 4730cm-1And 5750-6250 cm-1。
6. The on-line determination method according to claim 1, wherein in the first step, the nitrocellulose has a characteristic wavelength band of 5400 to 6000cm-1And 8000-9000 cm-1。
7. The on-line determination method according to claim 1, wherein n.gtoreq.3 in the second step.
8. The on-line judgment method according to claim 1, wherein in the third step, the environmental temperature of the sample application is 55 to 60 ℃ and the stirring time is 0.5 to 5 hours.
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