CN102564965B - Detecting method based on spectroscopy detection technology - Google Patents

Detecting method based on spectroscopy detection technology Download PDF

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CN102564965B
CN102564965B CN201110461623.5A CN201110461623A CN102564965B CN 102564965 B CN102564965 B CN 102564965B CN 201110461623 A CN201110461623 A CN 201110461623A CN 102564965 B CN102564965 B CN 102564965B
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characteristic peak
wavelengths
peak
range
objects interfered
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CN102564965A (en
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俞晓峰
吕全超
陈文益
顾海涛
陈莉
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Focused Photonics Hangzhou Inc
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Focused Photonics Hangzhou Inc
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Abstract

The invention provides a detecting method. The detecting method comprises the following steps: (A1) establishing a database, wherein the database contains possible interference objects within a wavelength interval of a characteristic peak of an object to be detected as well as characteristic peak wavelengths thereof and identifiable characteristic peak wavelengths thereof; (A2) obtaining a spectrogram of each object; (A3) searching possible interference objects, which fall within a wavelength interval of the characteristic peak of the object to be detected, as well as the identifiable characteristic peak wavelengths thereof; (A4) searching the identifiable characteristic peak in the spectrogram; if the identifiable characteristic peak is searched, showing that the characteristic peak of the interference object exists within the wavelength interval; if the identifiable characteristic peak is not searched, showing that the characteristic peak of the interference object does not exist within the wavelength interval; and consequently, identifying the interference object and the characteristic peak thereof which affect the characteristic peak of the object to be detected within the wavelength interval of the spectrogram; and (A5) obtaining the characteristic peak of the object to be detected, in which the influence from the interference object is eliminated within the wavelength interval, according to the spectrogram within the wavelength interval and the identified characteristic peak of the interference object so as to obtain the content of the object to be detected in the sample. The detecting method provided by the invention has the advantages of high automation degree, short measuring time and the like.

Description

Based on the detection method of spectrum detection technique
Technical field
The present invention relates to object as the detection of element, simple substance or compound, particularly the detection method based on spectrum detection technique.
Background technology
In ICP spectrum product, because the spectral line that ICP light source activation goes out is abundant especially, the interference ratio of spectral line is more serious, and the resolution characteristic of current spectrometer can not be separated all spectral lines completely, and this just must carry out some spectral line lock out operation by algorithm.This is also entirely to compose the advantage place of direct-reading type ICP-OES product with respect to sweep type or direct-reading type ICP-OES.
Spectrum stripping is exactly generally speaking by spectral line to be analyzed and disturbs spectral line, matrix, blank background etc. to separate.Current spectral line lock out operation gets up cumbersome (as the FACT algorithm of the MSF algorithm of PE and Varian), and needs the normal running of the known ability of interference element.Existing method is that standard specimen, the solution matrix to analyzed element and interference element measured respectively, carry out graphical analysis with obtained spectral data, thereby the interference spectral line on analyzed spectral line side is separated, need to and be disturbed solution to measure to the pure standard specimen of analyzed element, blank.Once after you please oneself to the spectrogram of each model, this model will be stored in method; In the middle of analysis afterwards, every measured spectral line is resolved the corresponding model of setting up according to it to spectrogram.The parsing peak being produced by analyzed element will participate in the calculating of analyzed element-intensities.
Utilize such method, must carry out at every turn spectral line separate the process of resolving in respectively measurements interference spectral line, spectral line to be measured, matrix and blank etc. sample, operation is trouble comparatively, and automaticity is lower.
Summary of the invention
In order to solve the deficiency in above-mentioned prior art scheme, the invention provides the detection method based on spectrum detection technique that a kind of detection time is short, automaticity is high.
The object of the invention is to be achieved through the following technical solutions:
Based on the detection method of spectrum detection technique, described detection method comprises the following steps:
(A1) set up characteristic peak database, described database is contained the characteristic peak information corresponding to objects interfered that may exist in the characteristic peak range of wavelengths of living in of object to be measured, and described information at least comprises the wavelength of the discernible characteristic peak of the wavelength of characteristic peak of objects interfered and corresponding objects interfered, objects interfered;
(A2) obtain in sample the spectrogram corresponding to the characteristic peak of each object;
(A3) wavelength of the discernible characteristic peak that the objects interfered that the further feature peak that may exist in the characteristic peak range of wavelengths of living in that utilizes the plan of object to be measured described in described database search to use is corresponding and this objects interfered are corresponding;
(A4) in described spectrogram, search described discernible characteristic peak: if obtain, in the characteristic peak range of wavelengths of living in that shows to intend using, have the characteristic peak of the objects interfered corresponding with described discernible characteristic peak; If do not obtain, in the characteristic peak range of wavelengths of living in that shows to intend using, there is not the characteristic peak of the objects interfered corresponding with described discernible characteristic peak; Thereby identify the objects interfered and the characteristic peak thereof that in the characteristic peak range of wavelengths of living in using in the plan of described spectrogram, the characteristic peak of object to be measured are formed impact;
(A5) characteristic peak of the spectrogram in the characteristic peak range of wavelengths of living in using according to plan and the objects interfered identifying, obtain at the characteristic peak of intending getting rid of in the characteristic peak range of wavelengths of living in using the object to be measured of objects interfered impact, and then utilize spectrum detection technique to know the content of object to be measured in sample.
According to above-mentioned detection method, alternatively, determine in step (A1) or before when the characteristic peak that described plan is used, omit described step (A3).
According to above-mentioned detection method, alternatively, described step (A4) further comprises:
According to the objects interfered identifying and corresponding can recognition feature peak, this objects interfered can recognition feature peak with intending the ratio of intensity of the characteristic peak in the characteristic peak range of wavelengths of living in using, be informed in the intensity of the characteristic peak of objects interfered in the characteristic peak range of wavelengths of living in of intending using in described spectrogram.
According to above-mentioned detection method, preferably, in described step (A4), in the characteristic peak range of wavelengths of living in that plan in described spectrogram is used, if when the ratio of the intensity of the characteristic peak of the objects interfered identifying and the characteristic peak of described object to be measured is less than threshold value, the impact of the characteristic peak of the characteristic peak of described objects interfered on object to be measured is ignored.
According to above-mentioned detection method, alternatively, described threshold value arranges according to the needs of accuracy of detection.
According to above-mentioned detection method, alternatively, discernible characteristic peak is: compared with the further feature peak of this objects interfered, and characteristic peak easy to identify.
According to above-mentioned detection method, preferably, described characteristic peak easy to identify is the strongest or by force inferior or does not disturb or be disturbed little characteristic peak.
According to above-mentioned detection method, alternatively, the characteristic peak of intending using is: compared with the further feature peak of this object to be measured, be disturbed little characteristic peak.
According to above-mentioned detection method, preferably, in described step (A5), utilize approximating method to extract the characteristic peak of the object to be measured of eliminating objects interfered impact.
According to above-mentioned detection method, preferably, described approximating method is Gauss curve fitting method, Lorentz, Voigt approximating method.
According to above-mentioned detection method, alternatively, in described step (A2), utilize atomic emission spectrum technology or absorption spectroscopy techniques or fluorescence spectroscopy technique or Raman spectroscopy to obtain described spectrogram.
According to above-mentioned detection method, alternatively, what described spectrogram had at least been contained the objects interfered that may exist in characteristic peak range of wavelengths of living in that the plan of object to be measured uses and this range of wavelengths can region, recognition feature peak.
According to above-mentioned detection method, preferably, described range of wavelengths is contained the region of the characteristic peak of object to be measured.
According to above-mentioned detection method, alternatively, described to liking element or simple substance or compound.
The ultimate principle of above-mentioned detection method is: this feature of characteristic peak (spectral line) based on remaining with all objects in sample (element or simple substance or compound) on full spectrum spectrogram is carried out decouples computation, because characteristic peak to be measured (spectral line) is adjacent with interference characteristic peak (spectral line) very near, its characteristic peak (spectral line) shape, feature are almost consistent, can carry out analog computation with same curve.
Compared with prior art, the beneficial effect that the present invention has is:
1, resolving is without knowing concrete objects interfered, without processing objects interfered sample, take full advantage of the advantage of full spectrum, from database and spectrogram, automatically calculate objects interfered, get rid of objects interfered to the impact detecting, thereby parse the characteristic peak (spectral line) of pure object to be measured, thereby eliminate characteristic peak interference problem, realize quantitative test.Abandon the shortcoming that original method is measured respectively each sample, utilized the abundant spectral line information collecting, each spectral information that only need to obtain testing sample of analyzing
2, whole testing process automaticity is high.
3, detection speed is high.
Brief description of the drawings
With reference to accompanying drawing, disclosure of the present invention will be easier to understand.Those skilled in the art hold intelligible: these accompanying drawings are only for illustrating technical scheme of the present invention, and are not intended to protection scope of the present invention to be construed as limiting.In figure:
Fig. 1 is according to the process flow diagram of the detection method of the embodiment of the present invention 1;
Fig. 2 is according to the spectrogram in the range of wavelengths (228.802nm ± 0.05nm) recording in the embodiment of the present invention 2,3;
Fig. 3 is according to the schematic diagram of other interference element in the range of wavelengths (228.802nm ± 0.05nm) recording in the embodiment of the present invention 2,3;
Fig. 4 is according to the characteristic peak of getting rid of the Cd after interference element impact in the embodiment of the present invention 2,3.
Embodiment
Fig. 1-4 and following declarative description optional embodiment of the present invention to instruct those skilled in the art how to implement and to reproduce the present invention.In order to instruct technical solution of the present invention, simplify or omitted some conventional aspects.Those skilled in the art should understand that be derived from these embodiments modification or replace will be within the scope of the invention.Those skilled in the art should understand that following characteristics can combine to form multiple modification of the present invention in every way.Thus, the present invention is not limited to following optional embodiment, and is only limited by claim and their equivalent.
Embodiment 1:
Fig. 1 has schematically provided the process flow diagram of the detection method based on spectrum detection technique of the embodiment of the present invention.As shown in Figure 1, described detection method comprises the following steps:
(A1) set up characteristic peak database, any object to be measured (as element, simple substance or compound) has own distinctive spectral line, and spectrum detection technique utilizes this feature to remove to detect object to be measured often;
Described database is contained the characteristic peak information corresponding to objects interfered that may exist in the characteristic peak range of wavelengths of living in of object to be measured: more than one of the characteristic peak of object to be measured, need to set up multiple such databases; Certainly, when testing sample is often run into and when difference is little or according to detection experience, only sets up one and contain the database of intending use characteristic peak; The foundation of database need to be consulted the characteristic peak of other all possible objects interfered, as consults the characteristic peak of other element, other simple substance, other compound, thereby in described interval, has which objects interfered to lay the foundation for follow-up judgement actually; Described information at least comprises the wavelength of the discernible characteristic peak of the wavelength of characteristic peak of objects interfered and corresponding objects interfered, objects interfered; The size of range of wavelengths is determined according to the width of the characteristic peak of object to be measured.
Alternatively, described discernible characteristic peak refers to: compare with the further feature peak of this objects interfered, the strongest or by force inferior or do not disturb or disturb few characteristic peak, so as by this can recognition feature peak existence whether go to judge whether this objects interfered exists.
Above-mentioned range of wavelengths size will contain the characteristic peak of object to be measured (sometimes also can broadening, as the pressure broadening at gas characteristic peak) region, thereby effectively get rid of the impact of (objects interfered) characteristic peak at all interference characteristics of objects to be measured peak.
(A2) obtain in sample the spectrogram corresponding to the characteristic peak of each object; As utilize atomic emission spectrum technology, absorption spectroscopy techniques, fluorescence spectroscopy technique, Raman spectroscopy to remove to obtain the full spectrogram of each object, what this spectrogram had been contained the objects interfered that may exist in the characteristic peak (at least comprise intend use characteristic peak range of wavelengths of living in), characteristics of objects to be measured peak range of wavelengths of living in of object to be measured can region, recognition feature peak.Described spectral technique is to hold intelligible prior art for a person skilled in the art.
(A3) wavelength of the discernible characteristic peak that the objects interfered that the further feature peak that may exist in the characteristic peak range of wavelengths of living in that utilizes the plan of object to be measured described in described database search to use is corresponding and this objects interfered are corresponding;
Remove to determine according to the concrete condition of the characteristic peak of each object to be measured in spectrogram the characteristic peak of intending use, or determined according to the similarity of detection experience or testing sample before detecting, alternatively, for easy to detect, the characteristic peak that described plan is used is selected those characteristic peaks easy to identify, also compare with the further feature peak of object to be measured, the strongest or inferior strong or be disturbed little characteristic peak.
If determined according to detection experience the characteristic peak of intending use in step (A1) or before, this step (A3) is omitted.
(A4) in described spectrogram, search described discernible characteristic peak: if obtain, in the characteristic peak range of wavelengths of living in that shows to intend using, have the characteristic peak of the objects interfered corresponding with described discernible characteristic peak; If do not obtain, show not exist in described range of wavelengths the characteristic peak of the objects interfered corresponding with described discernible characteristic peak; Thereby identify the objects interfered and the characteristic peak thereof that in the characteristic peak range of wavelengths of living in using in the plan of described spectrogram, the characteristic peak of object to be measured are formed impact;
In the residing range of wavelengths in plan use characteristic peak, the characteristic peak of the objects interfered identifying may not be an independently peak, but be superimposed with the characteristic peak of other objects interfered or object to be measured, be difficult to the intensity of the characteristic peak of determining this objects interfered, for this kind of situation, can select following method processing: objects interfered can recognition feature peak change very little with the ratio of the intensity of the characteristic peak in described range of wavelengths, can think constant, therefore, can according to objects interfered can recognition feature peak intensity and above-mentioned ratio, be informed in the intensity of intending the characteristic peak of objects interfered in the residing range of wavelengths in use characteristic peak in described spectrogram.
In the residing range of wavelengths in plan use characteristic peak, may there is the characteristic peak of a lot of objects interfereds, the characteristic peak intensity of these objects interfereds differs, for intensity relatively weak can select following method processing: if the intensity of the characteristic peak of the objects interfered identifying is while being less than threshold value with the ratio of the characteristic peak of the plan of described object to be measured use, the impact of the characteristic peak of described further feature peak on object to be measured is ignored.Alternatively, described threshold value arranges according to the needs of accuracy of detection, and as 1/50,1/100 etc., threshold value is less, and accuracy of detection is higher.
(A5) according to the characteristic peak of the objects interfered of intending the spectrogram in the residing range of wavelengths in use characteristic peak and identify, utilize the multiple approximating method such as Gauss curve fitting method or Lorentz fit method or other algorithm to obtain and get rid of the plan use characteristic peak of the object to be measured of objects interfered impact, and then utilize spectrum detection technique to know the content of object to be measured in sample.
The benefit reaching according to the embodiment of the present invention 1 is:.
Embodiment 2:
Application examples according to the detection method of the embodiment of the present invention 1 in element detects, specifically for analyzing the Cd constituent content in noble metal waste liquid, detection method is:
(A1) characteristic peak of Cd has: 228.802nm, 226.502nm..., and according to the detection experience of waste liquid, the characteristic peak of selecting the plan of Cd to use: 228.802nm, these characteristic peaks are relatively strong, disturb relatively little.Set up Cd characteristic peak database, database is contained interference element As, Pt, Rh, Re, Th, Tl, Br, Ni, Ru, Co, Ir, Sc, the W that in characteristic peak 228.802nm range of wavelengths of living in, (228.802nm ± 0.05nm) may exist, characteristic peak is respectively 228.812nm, 228.819nm, 228.825nm..., can recognition feature spike length be respectively: 189.042nm, 214.423nm, 343.489nm...
(A2) adopt atomic emission spectrum technology to obtain the spectrogram of the characteristic peak of an element in waste liquid; What as shown in Figure 2, this spectrogram had at least been contained interference element As, the Pt that may exist in described range of wavelengths (228.802nm ± 0.05nm), this range of wavelengths, Rh, Re, Th, Tl, Br, Ni, Ru, Co, Ir, Sc, W can region, recognition feature peak;
(A4) in described spectrogram, search the discernible characteristic peak corresponding to each interference element As, Pt that may exist, Rh, Re, Th, Tl, Br, Ni, Ru, Co, Ir, Sc, W: 189.042nm, 214.423nm, 343.489nm..., result, characteristic peak 189.042nm, 343.489nm are obtained, show to exist the characteristic peak of interference element As, Rh in range of wavelengths (228.802nm ± 0.05nm), as shown in Figure 3; Do not obtain corresponding to element Re, Th, Tl, Br, Ni, Ru, Co, Ir, Sc, W can recognition feature peak, show not exist the characteristic peak of interference element Pt, Re, Th, Tl, Br, Ni, Ru, Co, Ir, Sc, W in range of wavelengths (228.802nm ± 0.05nm); Thereby identify in the range of wavelengths (228.802nm ± 0.05nm) at described spectrogram and have interference element As, Rh and characteristic peak 228.812nm, 228.825nm;
In the range of wavelengths (228.802nm ± 0.05nm) of spectrogram, the characteristic peak of interference element Rh is peak independently, and the characteristic peak of interference element As and Rh, Cd characteristic peak is superimposed, be difficult to determine the intensity of characteristic peak, can select following method processing: interference element As can recognition feature peak 189.042nm changes very little (having a trickle variation with sample is different) from the ratio of the intensity of characteristic peak 228.812nm, can think constant, therefore, can be according to intensity and above-mentioned ratio that can recognition feature peak 189.042nm, know the intensity of characteristic peak 228.812nm,
In the range of wavelengths (228.802nm ± 0.05nm) of spectrogram, there is interference element As, the characteristic peak 228.812nm of Rh, the interference of 228.825nm, annoyance level differs, can select following method to process relatively weak interference characteristic peak: to calculate respectively interference element As, the characteristic peak 228.812nm of Rh, the intensity of 228.825nm and Cd intend the intensity ratio of the characteristic peak 228.802nm using, (threshold value is less for setting threshold 1/50, accuracy of detection is higher), above-mentioned ratio is all greater than threshold value, visible, interference element As, Rh can not ignore the impact of Elements C d to be measured.
(A5) according to characteristic peak 228.812nm, the 228.825nm of the interference element As, the Rh that intend the spectrogram in the residing range of wavelengths in use characteristic peak and identify, utilize Gauss curve fitting method to obtain the characteristic peak 228.802nm of the Elements C d to be measured of eliminating objects interfered impact, as shown in Figure 4, and then utilize atomic emission spectrum technology to know in sample the content of Elements C d to be measured in waste liquid.
Embodiment 3:
Application examples according to the detection method of the embodiment of the present invention 1 in element detects, specifically for analyzing the Cd constituent content in noble metal waste liquid, detection method is:
(A1) characteristic peak of Cd has: 228.802nm, 226.502nm....Set up Cd characteristic peak database, database is contained interference element As, Pt, Rh, Re, Th, Tl, Br, Ni, Ru, Co, Ir, Sc, the W that in characteristic peak 228.802nm range of wavelengths of living in, (228.802nm ± 0.05nm) may exist, characteristic peak is respectively 228.812nm, 228.819nm, 228.825nm..., can recognition feature spike length be respectively: 189.042nm, 214.423nm, 343.489nm....In like manner, also need to set up and contain the interference element characteristic of correspondence peak that may exist in (226.502nm ± 0.05nm) in the further feature peak range of wavelengths as of living in 226.502nm of Cd and database that can recognition feature peak;
(A2) adopt atomic emission spectrum technology to obtain the spectrogram of the characteristic peak of an element in waste liquid; What as shown in Figure 2, this spectrogram had been contained interference element As, the Pt that may exist in described range of wavelengths (228.802nm ± 0.05nm), this range of wavelengths, Rh, Re, Th, Tl, Br, Ni, Ru, Co, Ir, Sc, W can region, recognition feature peak;
(A3) according to described spectrogram, select the characteristic peak 228.802nm of Cd to intend the characteristic peak that uses, this characteristic peak is easy to identify, also compares with further feature peak, strong and be disturbed less.
Interference element As, Pt, Rh, Re, Th, Tl, Br, Ni, Ru, Co, Ir, Sc, W and the corresponding discernible characteristic peak that in the characteristic peak 228.802nm range of wavelengths of living in (228.802nm ± 0.05nm) that utilizes the plan of described database search Elements C d to be measured to use, may exist: 189.042nm, 214.423nm, 343.489nm...;
(A4) in described spectrogram, search the discernible characteristic peak corresponding to each interference element As, Pt that may exist, Rh, Re, Th, Tl, Br, Ni, Ru, Co, Ir, Sc, W: 189.042nm, 214.423nm, 343.489nm..., result, characteristic peak 189.042nm, 343.489nm are obtained, show to exist the characteristic peak of interference element As, Rh in range of wavelengths (228.802nm ± 0.05nm), as shown in Figure 3; Do not obtain corresponding to element Re, Th, Tl, Br, Ni, Ru, Co, Ir, Sc, W can recognition feature peak, show not exist the characteristic peak of interference element Pt, Re, Th, Tl, Br, Ni, Ru, Co, Ir, Sc, W in range of wavelengths (228.802nm ± 0.05nm); Thereby identify in the range of wavelengths (228.802nm ± 0.05nm) at described spectrogram and have interference element As, Rh and characteristic peak 228.812nm, 228.825nm;
In the range of wavelengths (228.802nm ± 0.05nm) of spectrogram, the characteristic peak of interference element Rh is peak independently, and the characteristic peak of interference element As and Rh, Cd characteristic peak is superimposed, be difficult to determine the intensity of characteristic peak, can select following method processing: interference element As can recognition feature peak 189.042nm changes very little (having a trickle variation with sample is different) from the ratio of the intensity of characteristic peak 228.812nm, can think constant, therefore, can be according to intensity and above-mentioned ratio that can recognition feature peak 189.042nm, know the intensity of characteristic peak 228.812nm,
In the range of wavelengths (228.802nm ± 0.05nm) of spectrogram, there is interference element As, the characteristic peak 228.812nm of Rh, the interference of 228.825nm, annoyance level differs, can select following method to process relatively weak interference characteristic peak: to calculate respectively interference element As, the characteristic peak 228.812nm of Rh, the intensity of 228.825nm and Cd intend the intensity ratio of the characteristic peak 228.802nm using, (threshold value is less for setting threshold 1/50, accuracy of detection is higher), above-mentioned ratio is all greater than threshold value, visible, interference element As, Rh can not ignore the impact of Elements C d to be measured.
(A5) according to characteristic peak 228.812nm, the 228.825nm of the interference element As, the Rh that intend the spectrogram in the residing range of wavelengths in use characteristic peak and identify, utilize Gauss curve fitting method to obtain the characteristic peak 228.802nm of the Elements C d to be measured of eliminating objects interfered impact, as shown in Figure 4, and then utilize atomic emission spectrum technology to know in sample the content of Elements C d to be measured in waste liquid.
Embodiment 4:
Application examples according to the detection method of the embodiment of the present invention 1 in gas detects, specifically for detecting methane (CH in rock gas 4) content, detection method is:
(A1) CH 4characteristic peak (spectral line) have: 3.3um, 7.65um etc.Set up CH 4characteristic peak database, database contain in characteristic peak 3.3um range of wavelengths of living in (7.65um ± 0.08um, interval scope has been considered the broadening of characteristic peak under the pressure of gas to be measured, pressure is larger, broadening is more serious, and interval range should be larger) interference gas that may exist has H 2s... wait gas, H 2the characteristic peak of S is respectively 2.6um, 7.7um.., can recognition feature spike length be respectively: 2.6um.In like manner, also need foundation to contain CH 4further feature peak range of wavelengths as of living in 3.3um in the interference gas characteristic of correspondence peak that may exist in (3.3um ± 0.08um) and database that can recognition feature peak;
(A2) adopt gaseous spectrum technology (use the laser that QC laser instrument sends to pass gas to be measured, receive through the light of gas to be measured and obtain spectrogram by detecting device) to obtain the spectrogram of the characteristic peak of various gases in gas to be measured; This spectrogram has been contained described range of wavelengths (3.3um ± 0.08um), (7.65um ± 0.08um), the interference gas H that may exist in this range of wavelengths 2that S... waits gas can region, recognition feature peak;
(A3), according to described spectrogram, select CH 4characteristic peak 7.65um intend the characteristic peak that uses, this characteristic peak is easy to identify, also compares with further feature peak, strong and be disturbed less.
Utilize described database search CH 4the characteristic peak 7.65um range of wavelengths of living in (7.65um ± 0.08um) that uses of plan in the interference gas H that may exist 2the gases such as S and corresponding discernible characteristic peak 2.6um...;
(A4) in described spectrogram, search corresponding to each interference gas H that may exist 2s... wait the discernible characteristic peak of gas: 2.6um..., result, has obtained characteristic peak 2.6um, shows to have interference gas H in range of wavelengths (7.65um ± 0.08um) 2the characteristic peak of S; Do not obtain corresponding to gas? can recognition feature peak, show not have interference element in range of wavelengths (7.65um ± 0.08um)? characteristic peak; Thereby identify in the range of wavelengths (7.65um ± 0.08um) at described spectrogram and have interference gas H 2s and characteristic peak 2.6um thereof;
In the range of wavelengths (7.65um ± 0.08um) of spectrogram, there is interference gas H 2the interference of the characteristic peak 2.6um of S, can select following method to process weak interference characteristic peak: to calculate interference gas H 2intensity and the CH of the characteristic peak 2.6um of S 4intend the intensity ratio of the characteristic peak 7.65um using, setting threshold 1/50 (threshold value is less, and accuracy of detection is higher), above-mentioned ratio is all greater than threshold value, visible, interference gas H 2s is to CH 4impact can not ignore.
(A5) according to intending the spectrogram in the residing range of wavelengths in use characteristic peak and the interference gas H identifying 2the characteristic peak 2.6um of S, utilizes Gauss curve fitting method to obtain the CH that gets rid of objects interfered impact 4intend the characteristic peak 7.65um using, and then utilize absorption spectroscopy techniques to know in sample CH in rock gas 4content.
In above-described embodiment 2-4, exemplarily provide the situation of utilizing atomic emission spectrum technology, absorption spectroscopy techniques to obtain spectrogram and analytical characteristic peak, certainly can also be the spectral technique such as Raman spectroscopy, fluorescence spectroscopy technique, these spectral techniques be that appearance is intelligible for a person skilled in the art.

Claims (14)

1. the detection method based on spectrum detection technique, described detection method comprises the following steps:
(A1) set up characteristic peak database, described database is contained the characteristic peak information corresponding to objects interfered that may exist in the characteristic peak range of wavelengths of living in of object to be measured, and described information at least comprises the wavelength of the discernible characteristic peak of the wavelength of characteristic peak of objects interfered and corresponding objects interfered, objects interfered; The size of range of wavelengths is determined according to the width of the characteristic peak of object to be measured;
(A2) obtain in sample the spectrogram corresponding to the characteristic peak of each object to be measured and objects interfered;
(A3) wavelength of the discernible characteristic peak that the objects interfered that the further feature peak that may exist in the characteristic peak range of wavelengths of living in that utilizes the plan of object to be measured described in described database search to use is corresponding and this objects interfered are corresponding;
(A4) in described spectrogram, search described discernible characteristic peak: if obtain, in the characteristic peak range of wavelengths of living in that shows to intend using, have the characteristic peak of the objects interfered corresponding with described discernible characteristic peak; If do not obtain, in the characteristic peak range of wavelengths of living in that shows to intend using, there is not the characteristic peak of the objects interfered corresponding with described discernible characteristic peak; Thereby identify the objects interfered and the characteristic peak thereof that in the characteristic peak range of wavelengths of living in using in the plan of described spectrogram, the characteristic peak of object to be measured are formed impact;
(A5) characteristic peak of the spectrogram in the characteristic peak range of wavelengths of living in using according to plan and the objects interfered identifying, obtain at the characteristic peak of intending getting rid of in the characteristic peak range of wavelengths of living in using the object to be measured of objects interfered impact, and then utilize spectrum detection technique to know the content of object to be measured in sample.
2. detection method according to claim 1, is characterized in that: determine in step (A1) or before when the characteristic peak that described plan is used, omit described step (A3).
3. detection method according to claim 1, is characterized in that: described step (A4) further comprises:
According to the objects interfered identifying and corresponding can recognition feature peak, this objects interfered can recognition feature peak with intending the ratio of intensity of the characteristic peak in the characteristic peak range of wavelengths of living in using, be informed in the intensity of the characteristic peak of objects interfered in the characteristic peak range of wavelengths of living in of intending using in described spectrogram.
4. detection method according to claim 1, it is characterized in that: in described step (A4), in the characteristic peak range of wavelengths of living in of intending using in described spectrogram, if when the ratio of the characteristic peak that the intensity of the characteristic peak of the objects interfered identifying and the plan of described object to be measured are used is less than threshold value, the impact of the characteristic peak that the characteristic peak of described objects interfered uses the plan of object to be measured is ignored.
5. detection method according to claim 4, is characterized in that: described threshold value arranges according to the needs of accuracy of detection.
6. detection method according to claim 1, is characterized in that: discernible characteristic peak is: compared with the further feature peak of this objects interfered, and characteristic peak easy to identify.
7. detection method according to claim 6, is characterized in that: described characteristic peak easy to identify is the strongest or by force inferior or does not disturb or be disturbed little characteristic peak.
8. detection method according to claim 1, is characterized in that: the characteristic peak of intending using is: compared with the further feature peak of this object to be measured, the strongest or inferior strong or be disturbed little characteristic peak.
9. detection method according to claim 1, is characterized in that: in described step (A5), utilize approximating method to extract the characteristic peak of the object to be measured of eliminating objects interfered impact.
10. detection method according to claim 9, is characterized in that: described approximating method is Gauss curve fitting method, Lorentz, Voigt approximating method.
11. detection methods according to claim 1, is characterized in that: in described step (A2), utilize atomic emission spectrum technology or absorption spectroscopy techniques or fluorescence spectroscopy technique or Raman spectroscopy to obtain described spectrogram.
12. detection methods according to claim 1, is characterized in that: what described spectrogram had at least been contained the objects interfered that may exist in characteristic peak range of wavelengths of living in that the plan of object to be measured uses and this range of wavelengths can region, recognition feature peak.
13. detection methods according to claim 1, is characterized in that: described range of wavelengths is contained the region of the characteristic peak of object to be measured.
14. according to the arbitrary described detection method of claim 1 to 13, it is characterized in that: described to liking element or simple substance or compound.
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