CN209542456U - A kind of difference Raman spectrometer that can deduct fluorescence in real time - Google Patents
A kind of difference Raman spectrometer that can deduct fluorescence in real time Download PDFInfo
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- CN209542456U CN209542456U CN201920179559.3U CN201920179559U CN209542456U CN 209542456 U CN209542456 U CN 209542456U CN 201920179559 U CN201920179559 U CN 201920179559U CN 209542456 U CN209542456 U CN 209542456U
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Abstract
The utility model discloses the difference Raman spectrometers that one kind can deduct fluorescence in real time, belong to field of optical measuring technologies.Spectrometer includes control unit, dual laser, binary channels light shifter and detector etc..Emitting dual-wavelength laser by dual laser successively excites sample to generate scattering spectrum acquisition Raman data, then processing is built to dual wavelength Raman data by control unit again, processing is built again including data smoothing, characteristic peak local interpolation and Raman, obtains the Raman spectrogram for deducting fluorescence.The utility model have many advantages, such as in real time deduct raman spectroscopy measurement during fluorescence background, improve sample detection effect.
Description
Technical field
The utility model relates to the difference Raman spectrometers that one kind can deduct fluorescence in real time, belong to spectral technique field.
Background technique
Raman spectrum detection has that detection speed is fast, does not damage sample, outstanding advantages of sample preparation is simple, be a kind of application extensively
General detection method.And with the maturation of Raman spectrum detection technique, miniaturization, portability and intelligence have been obtained more
Favor and development.Portable Raman spectrometer has many advantages, such as small in size, at low cost, live real-time detection, but also inevitable
Encounter some obstacles, wherein fluorescence interference be just the largest obstacle.
The physical mechanism of Raman spectroscopy is Raman scattering, but Raman scattering odds very little, Raman luminous intensity
Even more it is far smaller than fluorescence intensity.Even for resonance Raman scattering, fluorescence intensity be also 1000 times of Raman signal intensity with
On, thus Raman signal is often submerged in fluorescence signal.Fluorescence interference is that raman spectroscopy measurement is difficult to if getting around in the process
Topic, at present cope with fluorescence interference mode there are many, it is relatively effective include Fluorimetric Quenching Method, near-infrared excitation method, it is ultraviolet swash
Hair method, shift frequency excitation method etc..Fluorimetric Quenching Method even avoids generating fluorescence although can weaken fluorescence, but has very strong
Limitation and specific aim, such as different samples needs to take different quenchers, some quenchers even can be to detected sample
Product generate destruction.
Few samples molecule has electron transition absorption band near infrared region, uses infrared laser that can have as excitation light source
Avoid to effect the generation of fluorescence.But since the biquadratic of Raman scattering intensities and excitation wavelength is inversely proportional, excitation wavelength is too long, needs
The output power of laser is greatly improved, and infrared photoelectric detector cost is very high, therefore infrared excitation method is being selected to disappear
When subtracting fluorescence, excitation light source of the semiconductor laser of more options wavelength 785nm as Raman spectrometer.But 785nm laser
Fluorescence cannot be completely eliminated, the samples such as food, drug, drugs, explosive still have apparent fluorescence background, must still take further
Measure inhibits fluorescence.Ultraviolet laser can also often select 244nm laser as light source to avoid the generation of fluorescence background at this time
Device.But the main problem of burst of ultraviolel method is that sample is easy decomposed metamorphic, and high-performance ultraviolet laser under ultraviolet light
Device cost is very high.
Shift frequency excitation method using multiple wavelength laser light source is current fairly simple and common method, that is, difference light
Spectrometry.Since the wavelength (frequency) of Raman light and the wavelength (frequency) of exciting light are closely related, and fluorescence spectrum and excitation light wave
Then without obvious correlation between length.Therefore two width Raman spectrums, direct differential can be obtained by slightly changing excitation wavelength
Spectrum, to deduct fluorescence background.
Patent document CN105067114A discloses a kind of multi-wavelength external cavity laser for Raman spectrometer Control of Fluorescence
Emitter, including collimation laser transmitting group, grating, optical fiber combining output device and controller pass through circuit switching connection two
A above laser diode realizes output wavelength switching.Each collimation laser emitter includes a laser diode and one
Collimation lens, angle is 0~10 ° between the collimated light beam that the collimated lens of each adjacent two laser diode project.Patent
Document CN105552713A discloses a kind of multi-wavelength outside cavity gas laser for unstressed configuration Raman spectrometer, including parallel laser
Emitter, grating, optical fiber combining output device and controller, parallel laser emitter include at least two central wavelength phases
The diode laser matrix and collimation laser collimation optical elements of same laser diode composition.Collimation laser collimation optical elements
Microlens array including fast axis collimation mirror and including at least two lenticules.Patent document CN205607531U discloses one kind
Portable double wave long disappear fluorescence Raman spectrum detection system, including optical lens group, Raman spectrometer, first laser device, second
Laser and light control device, wherein first laser device wavelength 680nm, second laser wavelength 685nm.Patent document
CN207816830U discloses a kind of excitation of change wavelength and the adjustable Raman spectrometer of spectral region, the laser including variable wavelength
Device, first/second plane mirror, first/second concave mirror, detector, signal processing unit etc..
But existing difference Raman spectrometer is essentially all that substep is completed to the acquisition of spectrum and the difference of spectrum, i.e., first adopts
Collect spectrum, then does difference again, be extremely restricted in practical applications.On the one hand.Measured object uneven components, measured surface
It is uneven, even movable, and Spectral acquisition times are even longer up to several seconds, tens seconds, during this sample be easy to because
Slowly displacement occurs for the factors such as mechanical oscillation, temperature distortion, causes the variation of measured position, fluorescent emission and phosphor collection mistake
Cheng Douhui is affected, and the fluorescence background measured twice can differ larger, so that fluorescence background can not be deducted effectively.Another party
The phenomenon that face, sample itself gradually weakens there are also fluorescence intensity with the illuminated time, referred to as fluorescence decay, even for table
Smooth, uniform, the fixed sample in face, fluorescence signal can also be weaker than the fluorescence of measurement for the first time in the spectrum of measurement for the second time
Signal.
Utility model content
The utility model is intended to provide a kind of difference Raman spectrometer for deducting fluorescence in real time, by wavelength switching system and spy
It surveys device (such as CCD) triggering and signal acquisition process realizes linkage, so that spectra collection and spectrum differential process are completed at the same time, disappear
Except the fluorescence interference from activity, the sample of surface complexity or uneven components.
The utility model is achieved through the following technical solutions:
A kind of difference Raman spectrometer that can deduct fluorescence in real time, including control unit, laser, collimation lens, reflection
Mirror, dichroscope and convergent lens；The spectrometer further include binary channels light shifter, filter plate, condenser lens, optical splitter and
Detector, the filter plate include narrow band filter slice and long pass filter piece, the binary channels light shifter, collimation lens, narrowband
Filter plate and reflecting mirror are successively set on after the laser, and central coaxial, form transmitting optical path；The reflecting mirror with enter
Light is penetrated in 45 ° of settings, and it is arranged in parallel with dichroscope, the convergent lens and the long pass filter piece are separately positioned on
The front and rear sides of the dichroscope, the condenser lens, optical splitter and detector be successively set on the long pass filter piece it
Before, and convergent lens, dichroscope, long pass filter piece, condenser lens, optical splitter and detector central coaxial, form detection light
Road；Transmitting optical path main shaft and the detection optical path main shaft between the lasers and mirrors is in parallel arrangement；The control
Unit is separately connected the binary channels light shifter and the detector；The laser selects dual laser, for mentioning
For the laser of two beam different wave lengths.
In above-mentioned technical proposal, described control unit includes the control module being connected with each other, storage module and builds processing again
Module, the control module are connected with the binary channels light shifter and the detector respectively；The storage module with it is described
Detector is connected.
In above-mentioned technical proposal, the binary channels light shifter includes the two beam laser provided with the dual laser
Corresponding first passage and second channel, and allow hand over the control being arranged on the first passage or second channel and open
It closes.
The utility model has the following advantages that and the utility model has the advantages that issues swashing for two wavelength recently by dual laser
Light successively excites sample to generate scattering spectrum, obtains sample Raman data, by carrying out global smooth, Raman to its Raman data
Characteristic peak local interpolation and multimodal fitting are built again, obtain the Raman spectrum that sample deducts fluorescence in real time；In known sample spectrum peak
When number, more particularly to effectively enhance raman characteristic peak local signal, and weaken the signal at non-Raman signatures peak position, thus compared with
It realizes well and deducts fluorescent functional in real time, to solve hyperfluorescence sample, improve sample detection effect and provide technical solution.
Detailed description of the invention
Fig. 1 is the difference Raman spectrometer schematic diagram that can deduct fluorescence involved in the utility model in real time.
Fig. 2 is that the binary channels switch for the difference Raman spectrometer that can deduct fluorescence in real time involved in the utility model shows
It is intended to.
Fig. 3 is the Raman spectrogram of embodiment 1 involved in the utility model: a) difference spectrum；B) fit-spectra；C) weight
Build Raman spectrum.
Fig. 4 is measurement fit-spectra figure and the standard spectrum diagram comparison of embodiment 1 involved in the utility model.
In figure: 1-control unit；2-lasers；3-binary channels light shifters；4-collimation lenses；5-narrow band filter slices；6–
Reflecting mirror；7-dichroscopes；8-convergent lenses；9-samples to be tested；10-long pass filter pieces；11-condenser lenses；12-optical splitters；
13-sensors；14-build processing module again；15-control modules；16-memory modules；31-first passages；32-second channels；33–
Light switched mirror；34-light switch dichroscope；35-chopping motors；36-copped wave pieces.
Specific embodiment
Specific embodiment of the present utility model and the course of work are further described with reference to the accompanying drawing.
The positional terms such as the upper, lower, left, right, front and rear in present specification be positional relationship based on the figure and
It establishes.Attached drawing is different, then corresponding positional relationship is also possible to change therewith, therefore cannot be interpreted as with this to protection model
The restriction enclosed.
As shown in Figure 1, a kind of difference Raman spectrometer that can deduct fluorescence in real time, including control unit 1, laser 2, standard
Straight lens 4, reflecting mirror 6, dichroscope 7, convergent lens 8, binary channels light shifter 3, filter plate, condenser lens 11, optical splitter
12 and detector 13.Laser 2 selects dual laser, for providing the laser of two beam different wave lengths.
Filter plate includes narrow band filter slice 5 and long pass filter piece 10.
After being with the position that sample to be tested is placed, before spectrometer position is.Binary channels light shifter 3, collimation lens 4,
Narrow band filter slice 5 and reflecting mirror 6 are successively set on after laser 2, and central coaxial, form transmitting optical path.Reflecting mirror 6 with enter
Light is penetrated in 45 ° of settings, and it is arranged in parallel with dichroscope 7, and the reflecting surface of reflecting mirror 6 is towards dichroscope 7.Convergent lens
8 and long pass filter piece 10 be separately positioned on the front and rear sides of dichroscope 7.Condenser lens 11, optical splitter 12 and detector 13 by
It is proximal and distal to be successively set on before long pass filter piece 10, and convergent lens 8, dichroscope 7, long pass filter piece 10, condenser lens
11,13 central coaxial of optical splitter 12 and detector forms detection optical path.Emitting optical path main shaft with detection optical path main shaft is in parallel cloth
It sets.
Control unit 1 is separately connected binary channels light shifter 3 and detector 13.Control unit 1 includes the control being connected with each other
Molding block 15, storage module 16 and processing module 14 is built again.Control module 15 respectively with binary channels light shifter 3 and detector 13
It is connected.Storage module 16 is connected with detector 13.
Binary channels light shifter 3 includes first passage corresponding with two beam laser of dual laser offer and second
Channel, and allow hand over the control switch being arranged on first passage or second channel.It is one of to implement such as Fig. 2 institute
Show, binary channels photoswitch 3 includes first passage 31, second channel 32, chopping motor 35 and copped wave piece 36, is set on first passage 31
It is equipped with light switched mirror 33, light switching dichroscope 34 is provided on second channel 32, and light switched mirror 33 is by first
In the Laser emission in channel to light switching dichroscope 34, light switched mirror 33 and light is made to switch the light between dichroscope 34
Road becomes a part of first passage 31.Copped wave piece 36 is controlled by chopping motor 35, is switched in light switched mirror 33 and light
It is moved between first passage 31 between dichroscope 34 and second channel 32, blocks cutting laser via, so that only a branch of
Laser can pass through binary channels light shifter 3.
In use, sample to be tested is placed on the front of convergent lens 8 and is located in the focus of convergent lens 8, such as
The position of sample to be tested 9 shown in FIG. 1.
So that laser 2 is generated two beam wavelength is respectively λ1And λ2Laser, two beam laser issue from two positions, respectively with
The first passage entrance and second channel entrance of binary channels light shifter 3 are corresponding.Wavelength X1And λ2Difference be less than 2nm.
Being switched to binary channels light shifter 3 by control unit 1 makes wavelength λ1Laser pass through, and make wavelength λ1
Laser successively penetrate the collimation of collimation lens 4 and narrow band filter slice 5 filters and forms the central wavelength of straight line incidence as λ1, wave band model
It encloses for [λ1-1,λ1+ 1] the first incident light of nm；Central wavelength is λ1The first incident light of narrow-band be reflected into two by reflecting mirror 6
To in Look mirror 7, the dichroscope 7 focuses on the first the reflection of generation incident light to convergent lens 8 to test sample by convergent lens 8
On product, so that sample to be tested is excited and generate the first scattered signal；First scattered signal focuses by convergent lens 8 and returns and penetrate
Dichroscope 7 makes the spectral transmission of wavelength 200nm or more into long pass filter piece 10, and line focus lens 11 are focused by dividing
Light device 12 obtains the first dispersion spectrum collected for detector 14；Persistent collection time t obtains the first dispersion spectrum integrated value,
It is denoted as S (λ1) and pass through the storage record of control unit 1.
Being switched to binary channels light shifter 3 by control unit 1 makes wavelength λ2Laser pass through, and make wavelength λ2
Laser successively penetrate the collimation of collimation lens 4 and narrow band filter slice 5 filters and forms the central wavelength of straight line incidence as λ2, wave band model
It encloses for [λ2-1,λ2+ 1] the second incident light of nm；Central wavelength is λ2The second incident light of narrow-band be reflected into two by reflecting mirror 6
To in Look mirror 7, the dichroscope 7 focuses on the second the reflection of generation incident light to convergent lens 8 to test sample by convergent lens 8
On product, so that sample to be tested is excited and generate the second scattered signal；Second scattered signal focuses by convergent lens 8 and returns and penetrate
Dichroscope 7 makes the spectral transmission of wavelength 200nm or more into long pass filter piece 10, and line focus lens 11 are focused by dividing
Light device 12 obtains the second dispersion spectrum collected for detector 14；Persistent collection time t obtains the second dispersion spectrum integrated value,
It is denoted as S (λ2) and pass through the storage record of control unit 1.
It is repeated twice the above above process, is sequentially switched to two channel switch 3 by control unit 1 to make wavelength λ1Or
λ2Laser pass through, be denoted as n times, obtain N group S (λ1) and S (λ2) storage record；
By control unit 1 to N group S (λ1) and S (λ2) carry out spectrum and build processing again, rejecting burr: respectively to N group S (λ1)
With S (λ2) carry out that spectrum is smooth, and rejecting the false peak such as burr influences.Peak availability deciding: according to known raman characteristic peak
Number m, sets boundary 0.1m × FWHM≤p≤0.5m × FWHM, and the peak met the requirements is defined as effective peak, i.e. raman characteristic peak,
Wherein FWHM (full width at half maximum, full width at half maximum) value can pass through existing FWHM function measurement.Peak
Location determination: by carrying out 5 points three order derivative peak-seekings, peak-seeking function to Raman spectrumWherein x is expressed as abscissa wave number, and p indicates ordinate intensity, when there is x point
Three order derivatives at place become negative from positive number, and defining the position that three order derivatives are 0 is peak position, are recorded as Xi, i=1,
2,……,m.Raman characteristic peak local interpolation: interpolation is carried out within the scope of 2/3FWHM each to raman characteristic peak two sides, thus interpolation
Obtain fcni(λ1) and fcni(λ2), respectively to fcni(λ1) and fcni(λ2) summing obtainsWithBy to f1-f2It carries out multimodal fitting to build again, fitting boundary condition is [Xi-2,Xi+ 2], thus obtain to
The difference Raman spectrum of the real-time deduction fluorescence of sample.
Multimodal fitting is built again selects Gaussian rough surface to build again.
Embodiment 1:
Sample to be tested selects gypsum crystal, and gypsum crystal is placed on the focal plane near focal point of short focus lens 8, gypsum crystal
Surface can spontaneously form one layer of fluorescence coating in air, and fluorescence signal forms ambient noise throughout entire Raman spectrum, and interference is drawn
Graceful spectrum.Gypsum crystal is 200~1300cm in wave number under 785nm 784nm laser excitation-1There are 6 Ramans in range
Characteristic peak.
The time of integration is set as t=100ms, N=5, λ1=785nm, λ2=784nm, as described above the step of distinguish
5 groups of S (785nm) and 5 groups of S (784nm) are got, the smooth spectrum of Savitzky-Golay convolution algorithm, Savitzky- are passed through
Golay convolution algorithm window is 5, order 9, and the raman characteristic peak of smoothed out data is carried out Lagrange interpolation, is arrived
fcni(λ1) and fcni(λ2), respectively to fcni(λ1) and fcni(λ2) summing obtainsWith
Difference is carried out again obtains f1-f2, i.e., such as the corresponding difference spectrum of Fig. 3 a empty circles, 6 peak fittings are carried out using Gaussian peak approximation,
Obtain such as Fig. 3 b solid line differential data, so build to obtain again gypsum 785nm (or 784nm, the two can obtain simultaneously,
This is only under 785nm laser excitation condition) Raman signatures peak position under shooting condition, as shown in Fig. 3 c short dash line this
Gypsum Raman spectrum is built in invention again.Gypsum is built into Raman spectrum (as shown in Fig. 4 short dash line) and gypsum 785nm in 785nm again
Standard Raman spectroscopy data (raman characteristic peak under 85nm shooting condition is as indicated in a solid line in fig. 4) comparison, builds Raman spectral peaks again
Corresponding wave number wave number corresponding with standard Raman spectroscopy peak is almost consistent, and wave is displaced maximum deviation 4cm-1, corresponding wavelength deviation
About 0.25nm.It is followed successively by 419cm from small to large according to wave number as built Raman spectrum peak position again-1、498cm-1、621cm-1、
676cm-1、1013cm-1、1141cm-1, standard Raman spectroscopy peak position is followed successively by 417cm according to wave number from small to large-1、497cm-1、619cm-1、674cm-1、1010cm-1、1137cm-1, respectively less than spectral resolution more perfectly reappeared Raman spectrum.
Fluorescence background noise has effectively been deducted simultaneously.
The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, for this
For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model
Within, any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.
Claims (3)
1. one kind can deduct the difference Raman spectrometer of fluorescence in real time, the spectrometer include control unit (1), laser (2),
Collimation lens (4), reflecting mirror (6), dichroscope (7) and convergent lens (8), which is characterized in that the spectrometer further includes double
Channel light shifter (3), filter plate, condenser lens (11), optical splitter (12) and detector (13), the filter plate include narrowband
Filter plate (5) and long pass filter piece (10), the binary channels light shifter (3), collimation lens (4), narrow band filter slice (5) and anti-
It penetrates mirror (6) to be successively set on after the laser (2), and central coaxial, forms transmitting optical path；The reflecting mirror (6) with enter
Light is penetrated in 45 ° of settings, and it is arranged in parallel with dichroscope (7), the convergent lens (8) and the long pass filter piece (10)
It is separately positioned on the front and rear sides of the dichroscope (7), the condenser lens (11), optical splitter (12) and detector (13)
It is successively set on before the long pass filter piece (10), and convergent lens (8), dichroscope (7), long pass filter piece (10), poly-
Focus lens (11), optical splitter (12) and detector (13) central coaxial form detection optical path；The laser (2) and reflecting mirror
(6) the transmitting optical path main shaft and the detection optical path main shaft between are in parallel arrangement；Described control unit (1) is separately connected described
Binary channels light shifter (3) and the detector (13)；The laser (2) selects dual laser, for providing two beams
The laser of different wave length.
2. the difference Raman spectrometer that one kind according to claim 1 can deduct fluorescence in real time, which is characterized in that the control
Unit (1) processed includes the control module (15) being connected with each other, storage module (16) and builds again processing module (14), the control mould
Block (15) is connected with the binary channels light shifter (3) and the detector (13) respectively；The storage module (16) with it is described
Detector (13) is connected.
3. the difference Raman spectrometer that one kind according to claim 1 or 2 can deduct fluorescence in real time, which is characterized in that institute
Stating binary channels light shifter (3) includes first passage corresponding with two beam laser of dual laser offer and second
Channel, and allow hand over the control switch being arranged on the first passage or second channel.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109580587A (en) * | 2019-02-01 | 2019-04-05 | 浙江澍源智能技术有限公司 | A kind of difference Raman spectrometer that can deduct fluorescence in real time and its method |
| CN111562252A (en) * | 2020-06-30 | 2020-08-21 | 普识和康(杭州)科技有限公司 | Raman detection system based on coaxial dual-wavelength fluorescence elimination |
| CN114923892A (en) * | 2022-05-24 | 2022-08-19 | 中国工程物理研究院材料研究所 | Dual-wavelength near-infrared portable Raman spectrum device |
-
2019
- 2019-02-01 CN CN201920179559.3U patent/CN209542456U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109580587A (en) * | 2019-02-01 | 2019-04-05 | 浙江澍源智能技术有限公司 | A kind of difference Raman spectrometer that can deduct fluorescence in real time and its method |
| CN111562252A (en) * | 2020-06-30 | 2020-08-21 | 普识和康(杭州)科技有限公司 | Raman detection system based on coaxial dual-wavelength fluorescence elimination |
| CN114923892A (en) * | 2022-05-24 | 2022-08-19 | 中国工程物理研究院材料研究所 | Dual-wavelength near-infrared portable Raman spectrum device |
| CN114923892B (en) * | 2022-05-24 | 2023-05-23 | 中国工程物理研究院材料研究所 | Dual-wavelength near infrared portable Raman spectrum device |
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