CN106053361B - A kind of spectrum of Multi-example pond quantitative spectrochemical analysis is read and processing method and processing device - Google Patents
A kind of spectrum of Multi-example pond quantitative spectrochemical analysis is read and processing method and processing device Download PDFInfo
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- CN106053361B CN106053361B CN201610340905.2A CN201610340905A CN106053361B CN 106053361 B CN106053361 B CN 106053361B CN 201610340905 A CN201610340905 A CN 201610340905A CN 106053361 B CN106053361 B CN 106053361B
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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
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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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/12—Circuits of general importance; Signal processing
- G01N2201/127—Calibration; base line adjustment; drift compensation
- G01N2201/12707—Pre-test of apparatus, e.g. dark test, sensor test
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/12—Circuits of general importance; Signal processing
- G01N2201/127—Calibration; base line adjustment; drift compensation
- G01N2201/12746—Calibration values determination
Abstract
The invention discloses a kind of reading of the spectrum of Multi-example pond quantitative spectrochemical analysis and processing method and processing devices, sample cell is divided into reference cell and measuring cell by this method, two kinds of sample cells are full of reference substance first, and scanning optical spectrum, obtain being respectively designated as Back0, Back1, Back2, Back N be with light intensity output spectrum.In carrying out article analytic process, analysans is changed in measuring cell, the spectrum of the two is scanned in the way of scanning background spectrum again, and be respectively designated as meas0, meas1, meas2, meas N with light intensity be output spectrum, it is handled again by formula Absorbi=-log (measi/Backi)+log (meas0/Back0), obtains taking absorbance as the absorption spectrum exported.The spectrum of Multi-example pond provided by the invention quantitative spectrochemical analysis reads the method with processing, can overcome the inconsistent brought influence of the parameter differences between reference cell and measuring cell, especially window absorption spectrum；The drift and distortion bring deviation for avoiding baseline, substantially increase precision of analysis.
Description
[technical field]
The present invention relates to spectrum analysis fields, the in particular to spectrum analysis of article components and concentration.
[background technique]
The quantitative analysis of nearly all polar articles may be implemented in spectroscopic methodology.With computer technology, data analysis and place
The development of reason technology, in recent years, infra-red sepectrometry, ultraviolet spectroscopy started be applied to gas, liquid, even solid component and
The on-line analysis field of concentration, but there is also many problems for current application.It is explained by taking gas analysis as an example below.
1) when spectral resolution is higher, it may cause spectrum distortion.Due to spectral resolution is higher, scanning times are more
When, the spectral scan time is longer.For example, spectral resolution is 1cm-1, when scanning times are 8, obtain a spectrogram and taken
Between about 60 seconds.If resolution ratio is increased to 0.5cm-1, when scanning times increase to 32, obtain a spectrogram and then need about 500
The time of second.During gas on-line analysis, component and its concentration in gas to be analyzed are the moment all in variation.Due to light
The acquisition methods of spectrum be first obtain with light intensity be output background spectrum, then obtain with light intensity be output gas to be analyzed suction
Receive spectrum, then with absorption spectrum divided by background spectrum obtain with light transmittance be output spectrum, the common logarithm of this spectrum
The negative value of value, then for absorbance be output spectrogram.In experimental analysis application, in the general acquisition process for defaulting spectrum
Analyzed gas componant and its concentration are constant.Obviously, if carrying out the spectrum on line of gas only with a measurement gas chamber
Analysis, and gas is always flowing, then and this premise is invalid.Then, during spectral scan, due to
The variation of gas concentration, the spectrogram obtained every time are not the equal of the spectrogram in the case of same gas component and same concentrations
Value, the spectrum caused is unstable, even distorts, so that biggish deviation occur in Spectroscopic analysis results, especially
It is in the case where seriously being overlapped in gaseous mixture to be analyzed there are absorption spectrum, especially seriously.
2) it after spectrometer long-play, if environment changes, needs to rescan background spectrum, then may cause number
According to loss.Due to only one measurement gas chamber of conventional spectrometer, after working long hours, if larger change occurs for discovery environmental parameter
Change, needs to rescan background spectrum, then need to close gas chamber gas circuit, and be passed through background gas, then scanning background spectrum.By
The long period is needed in the cleaning of gas chamber, generally at several minutes, tested gas is passed through gas chamber, so that tested component gas concentration reaches
To stabilization, it is also desirable to which several minutes or even longer time, therefore, this method is easy to cause loss of data, and real-time is poor；
3) in addition, needing to take gas from multiple tunnels with multiple gas chambers in applications such as mine gas monitorings, gas front and back is taken
Time may be longer, in hours or so, it is difficult to which before and after guarantee takes gas, the environmental parameter of instrument is completely the same, including environment
The concentration of middle carbon dioxide gas.Due to being tested gas concentration very little itself, the variation of environmental parameter may cause analysis
Result error is larger.
In order to overcome the above problem, it may be considered that increase by one, even more than gas chamber, be full of background with one of gas chamber
Gas scans gas chamber as background spectrum, other as measurement gas chamber, i.e. scanning backlight time spectrum, and background gas chamber is cut into
In optical path, it is the background spectrum Back0 exported that spectrometer, which is obtained with light intensity, and when analyzing under test gas, then it will measure gas chamber
It cuts in optical path, at this point, spectrometer, which can scan to obtain, (indicates ith measurement gas with the measure spectrum Measij that light intensity is output
The spectrum that jth secondary measurement in room obtains), then executing formula (1) and obtaining with absorbance is the spectrum exported.
Absorbij=-log (Measij/Back0) formula (1)
Log () is common logarithm in formula, Absorbij indicate that ith measurement gas chamber jth time measurement obtains with extinction
Degree is the spectrum of output.Patent of invention ZL201110091432.4, ZL201410097985.4 and ZL201410119733.7 are
It is based on this thought.It can solve the above problem on this theoretical method, but precondition is that the physical parameter of gas chamber must
Must be just the same, i.e., the size of different gas chambers must accomplish almost, and frame material must also be processed into duplicate.But
Window plated film will be accomplished just the same such as the KBr plated film of middle infrared spectrum, that is very difficult.Due to the absorption light of window
Spectrum is not exclusively the same, this will bring baseline drift as shown in Figure 1, or even distortion to the absorption spectrum of gas, so as to cause gas
Body analytical concentration deviation is larger.
[summary of the invention]
The object of the present invention is to provide a kind of spectrum of Multi-example pond quantitative spectrochemical analysis to read and processing method and dress
It sets, to overcome the parameter differences between reference cell and measuring cell, especially window absorption spectrum inconsistent to absorption spectrum institute band
The influence come.
To achieve the goals above, the present invention carries out absorption spectrum reading and processing in the following way:
A kind of spectrum of Multi-example pond quantitative spectrochemical analysis is read and processing method, comprising the following steps:
(1) sample cell being divided into reference cell and measuring cell, reference cell is denoted as 0, measuring cell is successively denoted as 1,
2,···N；
(2) reference substance, and the scanning optical spectrum in the way of background spectrum are full of to reference cell and all measuring cells, obtained
Be respectively designated as Back0, Back1, Back2, Back N with light intensity be output spectrum；Wherein Back0 expression pair
The spectrum that reference cell scans, the spectrum that Back1 expression scans No. 1 measuring cell, other and so on；
(3) reference substance in sample cell is changed to analysans, then reference cell and measuring cell is successively cut in optical path,
Spectral scan is carried out, obtains being respectively designated as meas0, meas1, meas2, meas N with light intensity be the light exported
Spectrum；Wherein meas0 indicates that the spectrum scanned to reference cell, meas1 indicate the spectrum scanned to No. 1 measuring cell,
It and so on；
(4) spectral manipulation is carried out according to following formula (2), take absorbance as the absorption spectrum of output；
Absorbi=-log (measi/Backi)+log (meas0/Back0), wherein i=1,2, N formula (2),
In formula Absorbi be measuring cell i with absorbance be output absorption spectrum.
Further, the background spectrum in the step (2) is using wave number as horizontal axis, using light intensity as the spectrum of the longitudinal axis.
Further, in the optical path of the step (3), only one each sample cell.
Further, in the step (3), when carrying out article analysis every time, it is necessary to rescan measuring cell, obtain
meas1,meas2,···meas N；But the update mode of meas0 can be set according to the actual situation.
Further, the update mode of the meas0 can choose any one kind of them from following methods:
Mode one: it is all obtained when analysis every time；
Mode two: it obtains in regular intervals；
Mode three: decide whether to obtain from confirmation situation according to spectrum；
Mode four: mode two and mode San Tong method are used, that is, are met one of two conditions, just updated meas0；
And reference cell is being rescaned, before obtaining new meas0, meas0 is remained unchanged.
Further, the spectrum is from confirmation situation: determining to be according to whether spectrum occurs to drift about and distort
It is no to update meas0, if baseline drift is serious, or occurs baseline distortion, then reacquire meas0；Otherwise, meas0 is kept not
Become.
A kind of spectrum of Multi-example pond quantitative spectrochemical analysis is read and the device of processing, including a background gas gas chamber,
Multiple measurement gas gas chambers, support background gas gas chamber and the pedestal for measuring gas gas chamber, and driving measurement gas gas chamber move
It is dynamic and rotation to vertically move driving mechanism and rotational motion mechanism, it is further fitted on the pedestal and inductively measures gas gas
The upper limit sensor and lower limit sensor of room position；Admission line passes through pipeline adapting device and multiple measurement gas gas chambers
Gas inlet connection, the gas outlet of each measurement gas gas chamber connect by pipeline adapting device with outlet pipe,
The pipeline adapting device includes M+1 interface, wherein an interface is connect with admission line or outlet pipe, is left
M interface respectively with measurement gas gas chamber gas inlet or gas outlet connect.
Further, the rotational motion mechanism include motor and be motor driven and intermeshing pinion gear and
Gear wheel, wherein multiple measurement gas gas chambers are passed through from the gear wheel.
Further, the driving mechanism that vertically moves includes motor, screw rod and travelling nut, and the motor passes through electricity
Machine mounting base is fixed on the base, and the screw rod is fixedly connected with the output shaft of motor, and the travelling nut and screw rod cooperation are pacified
Dress.
Further, it further comprises having company that the spectrum of Multi-example pond quantitative spectrochemical analysis, which is read with the device of processing,
Mounting plate is connect, the travelling nut is mounted in connection plate；The measurement gas gas chamber and the fixed peace of background gas gas chamber
In gas chamber mounting base, gas chamber mounting base is fixedly connected by screw with connection plate.
Compared with the existing technology, the present invention at least has the advantages that
A kind of spectrum of Multi-example pond quantitative spectrochemical analysis provided by the invention reads the method with processing, solves multiplicity
The light transmission of the parameter in product pond, especially window or optical absorption characteristics can not be completely secured unanimously, using routine reference spectral comparison
Spectrum baseline drift, or even distortion are easily caused, so as to cause analysis result problem bigger than normal；The invention avoids the drifts of baseline
Shifting and distortion bring deviation, substantially increasing precision of analysis, (measure spectrum is obtained divided by background spectrum to transmit
Rate is the spectrum of output, and the negative value of the common logarithm value of the spectrum is as the spectrum of output, Multi-example pond spectrum with absorbance
In analysis, the spectrum that spectrum is scanned divided by background gas chamber is obtained with measurement gas chamber, obtains taking transmissivity as the spectrum exported, due to
The difference of two gas chamber window parameters, so that the difference of the two has been treated as absorption spectrum, so that baseline drifts about, very
To distortion.Method proposed by the present invention is then to seek absorption light by two gas chambers respectively scanning background spectrum and measure spectrum
The difference of spectrum, rather than be directly divided by with two conventional gas chambers to obtain spectrum, therefore the difference of window is just no longer contained in
In baseline)；Meanwhile the present invention can solve when rescaning background spectrum, data are easy to be lost, the poor problem of real-time.
Further, if wanting to save the time, the mode for updating meas0 can be set according to the actual situation, it is easy to operate.
[Detailed description of the invention]
Fig. 1 is the background that is scanned using background gas chamber as reference spectra, is inhaled with measuring the spectrum that gas chamber scans
Receive spectrum, the spectrum being calculated according to formula (1)；
Fig. 2 is three gas chambers switching schematic diagram；Wherein (a) is the connection schematic diagram for three gas chambers being vertically arranged, and figure (b) is three
The connection schematic diagram of three gas chambers of triangular arrangement；1 is two measurement gas chambers in figure, and 2 be solenoid valve, and 3 be threeway, and 4 be air inlet pipe
Road, 5 be outlet pipe, and 6 be background gas gas chamber；
Fig. 3 (a) is vertical and horizontal move mode air chamber switching apparatus cross-sectional view of the structure；1 is the first measurement gas chamber in figure,
6 be background gas gas chamber, and 7 be motor, and 11 be the second measurement gas chamber, and 12 be pedestal, and 13 be guide rod, and 14 be screw rod, and 15 be removable
Dynamic nut, 16 be bearing block, and 17 be lower limit level sensor, and 18 be upper limit sensor, and 19 be connection plate, and 20 be measurement gas
Room air inlet, 21 be gas chamber mounting base, and 22 be measurement gas chamber gas outlet, and 23 be holding screw；
Fig. 3 (b) is revolution mode air chamber switching apparatus structural schematic diagram, and 1 is the first measurement gas chamber in figure, and 2 be solenoid valve,
3 be threeway, and 4 be admission line, and 5 be outlet pipe, and 6 be background gas gas chamber, and 7 be motor, and 8 be pinion gear, and 9 are and three gas
The axis being connected with external air chamber support that room tightens together, 10 be gear wheel, and 11 be the second measurement gas chamber；
Fig. 4 be background gas chamber and measurement gas chamber twice sweep obtain with light intensity be export spectrogram；
Fig. 5 be respectively according to formula (2) and formula (1) obtain with absorbance be output spectrum.
[specific embodiment]
With reference to the accompanying drawing and embodiment present invention is further described in detail.
A kind of spectrum of Multi-example pond quantitative spectrochemical analysis is read and processing method, comprising the following steps:
(1) sample cell is divided into reference cell and measuring cell, carries out label, reference cell is denoted as 0, and other measuring cells are successively marked
It is shown as 1,2, N；
(2) reference substance, and the scanning optical spectrum in the way of background spectrum, the bias light are full of to all sample cells
Spectrum is using wave number as horizontal axis, using light intensity as the spectrum of the longitudinal axis；Obtain being respectively designated as Back0, Back1, Back2,
BackN is the spectrum exported with light intensity；Wherein Back0 indicates that the spectrum scanned to reference cell, Back1 are indicated to No. 1
The spectrum that measuring cell scans, other and so on；
(3) during analyzing gas, liquid or solid article, by reference cell, and it is full of analysans
All measuring cells successively cut in optical path, can adopt and manually switch, can also using automatic device automatically switch,
Guarantee only one each sample cell in optical path；Spectral scan is carried out to all sample cells again, and is indicated respectively
What it is for meas0, meas1, meas2, measN is the spectrum exported with light intensity；Wherein meas0 indicates to scan reference cell
Obtained spectrum, the spectrum that meas1 expression scans No. 1 measuring cell, other and so on；
(4) spectral manipulation is carried out according to following formula (2), take absorbance as the absorption spectrum of output；
Absorbi=-log (measi/Backi)+log (meas0/Back0), wherein i=1,2, N formula (2),
In formula Absorbi be measuring cell i with absorbance be output absorption spectrum.
Further, in the step (3), when carrying out article analysis every time, it is necessary to rescan measuring cell, obtain
meas1,meas2,···；But the update mode of meas0 can be set according to the actual situation, be appointed from following methods
Select one kind:
Mode one: it is all obtained when analysis every time；
Mode two: it 0.5~8 hour obtains in regular intervals；
Mode three: it decides whether to update meas0 according to whether spectrum occurs to drift about and distort, if baseline drift is tight
Weight, or baseline distortion occurs, then reacquire meas0；Otherwise, meas0 is remained unchanged.
Mode four: mode two and mode San Tong method are used, that is, are met one of two conditions, just updated meas0；
And reference cell is being rescaned, before obtaining new meas0, meas0 is remained unchanged.
Below with three gas chambers switch gas ftir analysis for, it is of the invention to illustrate
Embodiment.
Gas componant connect with two measurement gas chambers of concentration on-line optical spectroscopy analysis and a background gas chamber as shown in Fig. 2,
It can be and be vertically arranged, such as attached drawing 2 (a)；It is also possible to rounded projections arranged, such as attached drawing 2 (b).Two of two measurement gas chambers into
Port is respectively equipped with a solenoid valve 2, and solenoid valve 2 is connected by threeway 3 with admission line 4, two outlets of two measurement gas chambers
Mouth is then directly connected by threeway 3 with the gas outlet of gas circuit, and background gas is full of in background gas chamber 6.For general polarity point
Sub- gas on-line analysis application, the background gas are nitrogen.The present embodiment by taking the gas chamber connection type being vertically arranged as an example for
Bright embodiments of the present invention.
The switching device sectional view such as Fig. 3 (a) for vertically moving mode and moving horizontally is shown, including the first measurement gas chamber 1,
Second measurement gas chamber 11 and background gas chamber 6, linear bearing, vertical movement mechanism, limit sensors etc.；Guide rod 13 and bearing block 16
Linear bearing is constituted, guide rod 13 is fixedly mounted on floor, and bearing block 16 is fixedly mounted in connection plate 19；Motor 7, electricity
Machine mounting base, screw rod 14, removable nut 15 constitute vertical movement mechanism, and motor 7 is mounted on motor mount, can be connected
Continuous positive and negative rotation, motor mount are fixedly mounted on bottom plate by holding screw 23, and the output shaft of screw rod 14 and motor 7 is solid
Connection, removable nut 15 are fixedly mounted in connection plate 19；First measurement gas chamber 1, second measures gas chamber 11 and background gas
Room 6 is fixedly mounted in gas chamber mounting base 21, and gas chamber mounting base 21 is fixed with connection plate 19 by holding screw 23
It connects, is also equipped with 3 bearing blocks, 16, nuts in connection plate 19.Upper limit sensor 18, lower limit level sensor 17
It is fixedly mounted on pedestal 12, the spacing of sensor is adjusted according to the required displacement that vertically moves.When need by first survey
When amount gas chamber 1 is switched in optical path, control motor 7 is driven forward screw rod 14 and rotates, and then drives the nut cooperated with screw rod 14
It moves up, is moved up to be drivingly connected mounting plate 19, first and measure gas chamber 1 along linear bearing center, until the upper limit
Until level sensor 18 detects signal in place, i.e., the first measurement gas chamber 1 is moved in optical path, at this point, computer issues signal,
The solenoid valve for closing the first measurement gas chamber 1 opens the solenoid valve of the second measurement gas chamber 11；After scanning through spectrum, control motor is anti-
Turn drive connection 19, two measurement gas chambers of mounting plate to move down along linear bearing center, until lower limit level sensor 17 is examined
Until measuring signal in place, i.e., the second measurement gas chamber 11 is switched in optical path, at this point, computer issues signal, closes second
The solenoid valve of gas chamber 11 is measured, the solenoid valve of the first measurement gas chamber 1 is opened.In this way, in cycles, so that spectrometer carries out spectrum
When scanning, gas componant and its concentration in gas chamber are stable.
Shown in switching device schematic diagram such as Fig. 3 (b) of continuous rotary mode, there are two axis, the axis for the centre of three gas chambers
It tightens together with three gas chambers, is connected between outside.In addition, the middle part of three gas chambers is passed through from a gear wheel 10,
Stepper motor 7 rotates under the control of industrial personal computer etc., pinion gear 8 with stepper motor 7 is coaxial is connected, thus it is same with stepper motor 7
Step rotation, gear wheel 10 generate rotation under the driving of the pinion gear 8.Since the amount of feeding of stepper motor 7 is the shape with pulse
What formula provided, stepper motor 7 can inherently identify the Angle Position of itself rotor.Therefore, any one in three gas chambers
With by industrial personal computer send respective numbers impulsive switched into optical path, from a gas chamber be switched to another gas chamber needed for pulse
Quantity can be determined by test.Since three gas chambers are between each other at 120 degree, the Angle Position of stepper motor 7 can also be passed through
It determines.If the first measurement gas chamber 1 in the optical path, then passes through 120 degree of reversion using motor arrow direction in scheming as positive direction
Second measurement gas chamber 11 is switched in optical path, 120 degree of reversion is further continued for, then background gas chamber 6 can be switched in optical path.To
Again the first measurement gas chamber 1 is switched in optical path, then rotates forward 240 degree.
Before the spectrum analysis for carrying out gas, it is filled with nitrogen in three gas chambers, then according to above-mentioned handoff functionality, according to
It is secondary that three gas chambers are switched in light path of optical spectrometer, and scan and obtain take light intensity as the spectrum that exports as background spectrum, three
Background spectrum is respectively designated as Back0, Back1 and Back2.Wherein Back0 is the spectrum of background gas chamber 6, Back1 and Back2
The background spectrum of respectively first measurement gas chamber 1 and the second measurement gas chamber 11.
It during carrying out spectrochemical analysis for gases, measures and is full of under test gas in gas chamber, the first measurement gas chamber 1 cuts optical path
When, it and gas circuit are cut off, and the second measurement gas chamber 11 cuts gas circuit, carry out gas replenishment.Spectrometer carries out the first measurement gas chamber 1
Spectral scan obtains taking light intensity as the spectrum Meas1 exported, and the second measurement gas chamber 11 is then cut optical path again, first is surveyed
It measures gas chamber 1 and cuts gas circuit.Spectrometer carries out spectral scan to the second measurement gas chamber 11, obtains taking light intensity as the spectrum exported
Meas2.If the acquisition for completing Back0, Back1 and Back2 and Meas1 and Meas2 (in 2 hours) in the short time, is pressed
Formula (3) is handled:
Absorbi=-log (measi/Backi), wherein i=1,2 formulas (3)
Obtain Absorb1 and Absorb2.If the time is longer (3 hours or more), after obtaining Meas1 and Meas2,
Again gas chamber 3 is cut into optical path, reacquires Meas0, is handled by formula (2), obtain Absorb1 and Absorb2.If the time
In 2~3 hours, user can voluntarily selecting type (2) or formula (3) be handled.
Background gas chamber 6 and first measurement gas chamber 1 acquisition Back0, Back1 and Meas0 and Meas1 are as shown in Figure 4.From
As can be seen that Back0 and Meas0 is essentially coincided, Back1 and Meas1 are essentially coincided figure, this illustrates spectrometer preheating sufficiently, real
Testing program, there is no problem；The strength difference of Back0 and Back1 is larger, and the light intensity of Back1 is about the 2/3 of Back0, this explanation two
The window absorption difference of a gas chamber is larger, measures the window of gas chamber, whole to Infrared spectra adsorption stronger.
Respectively according to formula (2) and (1) obtain with absorbance be output spectrum distinguish it is as shown in Figure 5
Absorbance1 and Absorbance2.As can be seen from Figure 5: the baseline value of Absorbance1 is essentially 0, and
The baseline of Absorbance2 then has apparent inclination, as wave number is from 4000cm-1It is reduced to 400cm-1, absorbance from 0.13 increase
It is big to arrive about 0.3, and baseline is not straight line, in 1000cm-1To 1200cm-1In range, there are three obvious peak directed downwardly,
This explanation is larger according to the spectrum baseline drift that formula (1) obtains, and has distortion, and non-according to the spectrum baseline that formula (2) obtain
It is conventional then, compared to formula (1) obtain spectrum, can to avoid baseline drift with distort bring deviation.
The time interval for obtaining Meas0, can determine according to the actual situation, can set Fixed Time Interval, can also lead to
The confirmation certainly of spectrum is crossed to decide whether to carry out reacquisition Meas0.If it find that baseline is distorted, then by background gas
Room switches to and reacquires Meas0 in optical path, and otherwise, Meas0 is remained unchanged.Whether baseline is distorted, determination method ginseng
See patent of invention " Fourier transform infrared spectrum distortion identification and processing method (ZL201010268039.3) ".
Compared with the existing technology, the present invention at least has the advantages that
A kind of spectrum of Multi-example pond quantitative spectrochemical analysis provided by the invention reads the method with processing, solves multiplicity
The optical absorption characteristics of the parameter in product pond, especially window can not be completely secured unanimously, be easy to draw using routine reference spectral comparison
Spectrum baseline drift, or even distortion are played, so as to cause analysis result problem bigger than normal；The drift and distortion for avoiding baseline are brought
Deviation, substantially increase precision of analysis (measure spectrum divided by background spectrum obtain be with transmissivity output light
Spectrum, the negative value of the common logarithm value of the spectrum be as the spectrum exported with absorbance, in the spectrum analysis of Multi-example pond, with survey
Amount gas chamber obtains the spectrum that spectrum is scanned divided by background gas chamber, obtains taking transmissivity as the spectrum exported, due to two gas chamber windows
The difference of piece parameter, so that the difference of the two has been treated as absorption spectrum, so that baseline drifts about, or even distortion.This
The method that invention proposes is to pass through, then two gas chambers respectively scanning background spectrum and measure spectrum seek the difference of absorption spectrum,
Rather than be directly divided by with two conventional gas chambers to obtain spectrum, therefore the difference of window is just no longer contained in baseline)；Together
When, it can solve when rescaning background spectrum, data are easy to be lost, the poor problem of real-time.
Further, if wanting to save the time, the mode for updating meas0 can be set according to the actual situation, it is easy to operate.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
A specific embodiment of the invention is only limitted to this, for those of ordinary skill in the art to which the present invention belongs, is not taking off
Under the premise of from present inventive concept, several simple deduction or replace can also be made, all shall be regarded as belonging to the present invention by institute
Claims of submission determine scope of patent protection.
Claims (10)
1. a kind of spectrum of Multi-example pond quantitative spectrochemical analysis is read and processing method, it is characterised in that: the following steps are included:
(1) sample cell is divided into reference cell and measuring cell, reference cell is denoted as 0, and measuring cell is successively denoted as 1,2, N；
(2) reference substance, and the scanning optical spectrum in the way of background spectrum are full of to reference cell and all measuring cells, are distinguished
Be denoted as Back0, Back1, Back2, Back N with light intensity be output spectrum；Wherein Back0 is indicated to reference
The spectrum that pond is scanned, the spectrum that Back1 expression scans No. 1 measuring cell, other and so on；
(3) reference substance in sample cell is changed to analysans, then reference cell and measuring cell is successively cut in optical path, carried out
Spectral scan, obtain being respectively designated as meas0, meas1, meas2, meas N be with light intensity output spectrum；Its
Middle meas0 indicates the spectrum scanned to reference cell, and meas1 indicates the spectrum scanned to No. 1 measuring cell, it is other successively
Analogize；
(4) spectral manipulation is carried out according to following formula (2), obtains taking absorbance as the absorption spectrum exported；
Absorbi=-log (measi/Backi)+log (meas0/Back0), wherein i=1,2, N formula (2),
In formula Absorbi be measuring cell i with absorbance be output absorption spectrum.
2. a kind of spectrum of Multi-example pond quantitative spectrochemical analysis according to claim 1 is read and processing method, feature
Be: the background spectrum in the step (2) is using wave number as horizontal axis, using light intensity as the spectrum of the longitudinal axis.
3. a kind of spectrum of Multi-example pond quantitative spectrochemical analysis according to claim 1 is read and processing method, feature
It is: in the optical path of the step (3), only one each sample cell.
4. a kind of spectrum of Multi-example pond quantitative spectrochemical analysis according to claim 1 is read and processing method, feature
Be: in the step (3), when carrying out article analysis every time, it is necessary to rescan measuring cell, obtain meas1,
meas2,···measN；But the update mode of meas0 can be set according to the actual situation.
5. a kind of spectrum of Multi-example pond quantitative spectrochemical analysis according to claim 4 is read and processing method, feature
Be: the update mode of the meas0 can choose any one kind of them from following methods:
Mode one: it is all obtained when analysis every time；
Mode two: it obtains in regular intervals；
Mode three: decide whether to obtain from confirmation situation according to spectrum；
Mode four: mode two and mode San Tong method are used, that is, are met one of two conditions, just updated meas0；
And reference cell is being rescaned, before obtaining new meas0, meas0 is remained unchanged.
6. a kind of spectrum of Multi-example pond quantitative spectrochemical analysis according to claim 5 is read and processing method, feature
Be: the spectrum is from confirmation situation: deciding whether to update according to whether spectrum occurs to drift about and distort
Meas0 then reacquires meas0 if baseline drift is serious, or occurs baseline distortion；Otherwise, meas0 is remained unchanged.
7. a kind of spectrum of Multi-example pond quantitative spectrochemical analysis reads the device with processing, it is based on multiplicity described in claim 1
The spectrum of product pond spectrum analysis is read and processing method, it is characterised in that: including background gas gas chamber (6), a multiple measurements
Gas gas chamber (1,2), support background gas gas chamber and the pedestal for measuring gas gas chamber, respectively drive measurement gas gas chamber it is mobile and
Rotation vertically moves driving mechanism and rotational motion mechanism, is further fitted on the pedestal and inductively measures atomisation station
Upper limit sensor and lower limit sensor；Admission line by pipeline adapting device and it is multiple measurement gas gas chambers gases into
The gas outlet of port connection, each measurement gas gas chamber is connect by pipeline adapting device with outlet pipe, the pipe
Road switching device includes M+1 interface, wherein an interface is connect with admission line or outlet pipe, remaining M interface
It is connect respectively with the gas inlet of measurement gas gas chamber or gas outlet.
8. a kind of spectrum of Multi-example pond quantitative spectrochemical analysis according to claim 7 reads the device with processing, special
Sign is: the rotational motion mechanism includes motor and is motor driven and intermeshing pinion gear and gear wheel,
In, multiple measurement gas gas chambers are passed through from the gear wheel.
9. a kind of spectrum of Multi-example pond quantitative spectrochemical analysis according to claim 7 reads the device with processing, special
Sign is: the driving mechanism that vertically moves includes motor, screw rod and travelling nut, and the motor is solid by motor mount
It is scheduled on pedestal, the screw rod is fixedly connected with the output shaft of motor, and the travelling nut is coupled with screw rod.
10. a kind of spectrum of Multi-example pond quantitative spectrochemical analysis according to claim 9 reads the device with processing, special
Sign is: it further comprises having connection plate that the spectrum of Multi-example pond spectrum analysis, which is read with the device of processing, described
Travelling nut is mounted in connection plate；The measurement gas gas chamber and background gas gas chamber are fixedly mounted on gas chamber mounting base
On, gas chamber mounting base is fixedly connected by screw with connection plate.
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