CN106596500A - Raman spectrum system with adjustable space offset and Raman spectrum detection method - Google Patents
Raman spectrum system with adjustable space offset and Raman spectrum detection method Download PDFInfo
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- 238000001237 Raman spectrum Methods 0.000 title claims abstract description 47
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- 238000010168 coupling process Methods 0.000 claims abstract description 56
- 238000005859 coupling reaction Methods 0.000 claims abstract description 56
- 238000001069 Raman spectroscopy Methods 0.000 claims abstract description 45
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
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- G01N21/65—Raman scattering
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- G—PHYSICS
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/44—Raman spectrometry; Scattering spectrometry ; Fluorescence spectrometry
- G01J3/4412—Scattering spectrometry
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Abstract
The invention discloses a Raman spectrum system with adjustable space offset and a Raman spectrum detection method. The Raman spectrum system comprises a laser device (1), a light path converting device (2), a focusing collecting optical system (3), a coupling optical system (4), an optical fiber bundle (5) and at least one spectrograph (6). The input end of the optical fiber bundle (5) is arranged at the focal plane of the coupling optical system (4), optical fibers at the input end of the optical fiber bundle (5) are distributed annularly, at least one optical fiber is arranged in the center of the optical fiber bundle, a plurality of optical fibers distributed circularly are arranged at the outer ring position, and the distances between the optical fibers and the optical fiber in the center are the same. The output end of the optical fiber bundle (5) is connected with the spectrograph (6). The system and method can conveniently achieve continuous adjustment of the space offset of the Raman spectrograph under the condition that the sampling optical fibers do not need to be moved or the number of the sampling optical fibers does not need to be increased.
Description
Technical field
The present invention relates to technical field of spectral detection, more particularly to a kind of adjustable Raman spectrum system of spatial offset and
Raman spectroscopic detection method.
Background technology
Traditional Raman spectrum can only detect the superficial information of sample or can only penetrate transparent top layer detecting bottom.
And new space displacement Raman spectrum (Spatially Offset Raman Spectroscopy, abbreviation SORS) technology can
With some millimeters of deep detection sample, to analyze the chemical information of opaque sample interior.Many analysis applications need very high
Chemical specificity, and penetrate the ability of the opaque sample of multilamellar or opaque packaging material, such as lossless decomposition skeletal diseases, search
Counterfeit drug in the hidden explosive of rope, identification packaging.Traditional Raman spectrum is backscattering form, it is easy to accomplish, but
Penetration depth very shallow (the such as biological tissue of hundreds of micron of thickness).Recently, with the birth of space displacement Raman spectrum SORS, wear
Thoroughly depth is considerably increased.
Space displacement Raman spectrum SORS is a kind of patent Raman technology (referenced patent number that Englishman proposes：With reference to special
Profit number：US7652763, CN101115987, EP1828753, US7911604, GB2457212, AU2005313145,
JP5449712007), thick coating can be passed through and detects high-quality raman spectral signal, can clearly distinguish material
With the Raman spectrum of container, realize differentiating while material and container.
Space displacement Raman spectrum can obtain appropriate diffusing scattering sample Raman spectrum successively, and laser power
It is relatively low.SORS Method And Principles are to leave collection Raman signal at illuminated laser spot certain displacement in sample surfaces, and displacement S is got over
Greatly, the contribution of deeper sample is more in gained Raman signal.The situation of fluorescence is also similar.
SORS not only chemical specificities with Raman spectrum, and the information of sample Deep can be provided, have it is huge and
Prospect is widely applied, non-intruding skeleton Raman spectrum, the exploitation of cancer diagnosis instrument can be widely used in, detected and dispersed jet modling
Counterfeit drug, mail safety check, detection liquid and solid-state explosive etc. field in material bottle.
In prior art, single fibre bundle can only design fixed spatial offset, and in practical application, different wears
Spatial offset corresponding to saturating depth is required and differed, in order to realize the sampling to different side-play amounts, it usually needs corresponding
The fiber port of mobile sampling or the position of mobile laser facula carry out acquisition time, or the more sampling optical fiber of arrangement to cover
The sufficiently large offset ranges of lid, these means can cause fibre bundle design complicated or greatly increase the quantity of sensor.
The content of the invention
In order to solve above-mentioned technical problem of the prior art, the invention provides a kind of adjustable Raman of spatial offset
Spectroscopic system and Raman spectroscopic detection method.
The invention provides a kind of adjustable Raman spectrum system of spatial offset, including：Laser instrument, light path converting dress
Put, focused acquisition optical system, coupling optical system, fibre bundle, at least a spectrogrph；
The laser instrument is used for the parallel laser beam of output collimation；
The optical path switching device is arranged on the output light path of the laser instrument output laser beam, for swashing to described
Light light beam is reflected；
The aggregation collection optical system is arranged in the way of the laser beam reflected perpendicular to the optical path switching device
In the side of the optical path switching device, for assembling the light beam after the optical path switching device reflects and gathering signal beams
And it is collimated light beam to collimate；
The coupling optical system is arranged at institute in the way of the laser beam transmitted perpendicular to the optical path switching device
The opposite side of optical path switching device is stated, for carrying out the light beam for receiving to pool as and be coupled to the input of fibre bundle；
The input of the fibre bundle is arranged at the focal plane of the coupling optical system, the input of the fibre bundle
Optical fiber be annularly distributed, center arranges at least one optical fiber, and outer ring position arranges the distance of many and the optical fiber of center
Optical fiber that is identical and constituting circular arrangement；The outfan of the fibre bundle connects the spectrogrph.
The adjustable Raman spectrum system of above-mentioned spatial offset also has the characteristics that：
To focus optical system, the coupling optical system is varifocal optical system to the focused acquisition optical system；
Or, the focused acquisition optical system is varifocal optical system, and the coupling optical system is to focus optical system
System；
Or, the focused acquisition optical system and the coupling optical system are varifocal optical system.
The adjustable Raman spectrum system of above-mentioned spatial offset also has the characteristics that：
When the spectrogrph is imaging spectrometer, the number of the spectrogrph is 1, and the fibre bundle is with an output
End, the optical fiber of the outfan of the fibre bundle is linearly distributed and couples with the slit of the spectrogrph, the fibre bundle
The other end of the central optical fiber of input is located at one end of the outfan of the fibre bundle.
The adjustable Raman spectrum system of above-mentioned spatial offset also has the characteristics that：
When the spectrogrph is non-imaged spectrogrph, the number of the spectrogrph is 2, and the spectrogrph includes the first light
Spectrometer and the second spectrogrph, the fibre bundle is that Y shape optical fiber beam has two outfans, and the optical fiber of the first outfan is in wire point
Cloth and couple with the slit of the first spectrogrph, the quantity of the optical fiber of the first outfan is the outer shroud of the input of the fibre bundle
The quantity of the optical fiber of position, the optical fiber of the second outfan is linearly distributed and couples with the slit of second spectrogrph,
The quantity of the optical fiber of two outfans is the quantity of the optical fiber of the center of the input of the fibre bundle.
The adjustable Raman spectrum system of above-mentioned spatial offset also has the characteristics that：
The Raman spectrometer also includes being arranged at swashing with described between the laser instrument and the optical path switching device
The vertical purification optical filter of the laser beam of light device；
Also include the notch filtering light piece being arranged between the optical path switching device and coupling optical system.
Present invention also offers a kind of Raman spectroscopic detection method, including：
Sample is positioned over into the focal point of focused acquisition optical system；The parallel laser light of collimation is launched by laser instrument
Beam；
The laser beam for receiving is reflexed to focused acquisition optical system, the focused acquisition optics by optical path switching device
The laser beam that the optical path switching device reflects is gathered in system the focal point for being placed with sample, and is transmitted from sample scattering
The light beam for returning, kernel of this light beam comprising central vision skew Raman scattering light beam and non-central visual field have spatial offset
Spatial deviation Raman scattering light beam；
The coupling optical system carries out the light beam for receiving to pool as and be coupled to the input of fibre bundle, will not
Converge to the diverse location of the input of fibre bundle respectively with the light beam at visual field, specifically make central optical fiber correspondence central vision
So as to couple kernel skew Raman scattering light beam, the non-central visual field of outer shroud fibre bundle correspondence is made so as to coupled room offsets Raman
Scattered beam；
By spectrometer collection spectral signal；If current spatial side-play amount does not meet collection when requiring, according to lower section
The size of formula adjustment space skew is gathered with the Raman spectrum for realizing different spaces displacement：
The focused acquisition optical system is the varifocal optical system and coupling optical system is to focus optical system
When, the focal length for adjusting the focused acquisition optical system is acquired again；
The focused acquisition optical system is to focus optical system and the coupling optical system is varifocal optical system
When, the focal length for adjusting the coupling optical system is acquired again；
The focused acquisition optical system is the varifocal optical system and coupling optical system is varifocal optical system
When, the focal length for adjusting the focused acquisition optical system and the coupling optical system is acquired again.
Above-mentioned Raman spectroscopic detection method also has the characteristics that：
The size of the space displacement amount is by the focal length f3 of focused acquisition optical system and Jiao of the coupling optical system
Away from f4 and optical fiber outer shroud radius R0Determined, met R=R0* f4/f3, wherein R are the space displacement amount.
Above-mentioned Raman spectroscopic detection method also has the characteristics that：
When the spectrogrph is imaging spectrometer, the number of the spectrogrph is 1, and the fibre bundle is with an output
End, the optical fiber of the outfan of the fibre bundle is linearly distributed and couples with the slit of the spectrogrph, the fibre bundle
The other end of the central optical fiber of input is located at one end of the outfan of the fibre bundle.
Above-mentioned Raman spectroscopic detection method also has the characteristics that：
When the spectrogrph is non-imaged spectrogrph, the number of the spectrogrph is 2, and the spectrogrph includes the first light
Spectrometer and the second spectrogrph, the fibre bundle is that Y shape optical fiber beam has two outfans, and the optical fiber of the first outfan is in wire point
Cloth and couple with the slit of the first spectrogrph, the quantity of the optical fiber of the first outfan is the outer shroud of the input of the fibre bundle
The quantity of the optical fiber of position, the optical fiber of the second outfan is linearly distributed and couples with the slit of second spectrogrph,
The quantity of the optical fiber of two outfans is the quantity of the optical fiber of the center of the input of the fibre bundle.
Raman spectroscopic detection method proposed by the present invention, moving sampling optical fiber or can increase sampling optical fiber
In the case of quantity, the continuously adjustable of the spatial offset of Raman spectrometer is conveniently realized.
Description of the drawings
The accompanying drawing for constituting the part of the present invention is used for providing a further understanding of the present invention, the schematic reality of the present invention
Apply example and its illustrate, for explaining the present invention, not constituting inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the structure chart of the adjustable Raman spectrum system of spatial offset in embodiment one；
Fig. 2 is the structure chart of the adjustable Raman spectrum system of spatial offset in embodiment two；
Fig. 3 is the structure chart of the adjustable Raman spectrum system of spatial offset in embodiment three；
Fig. 4 is the structure chart of the adjustable Raman spectrum system of spatial offset in example IV；
Fig. 5 is the flow chart of the Raman spectroscopic detection method for using the adjustable Raman spectrum system of above-mentioned spatial offset.
Specific embodiment
To make purpose, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
The a part of embodiment of the present invention, rather than the embodiment of whole.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.Need
Illustrate, in the case where not conflicting, the feature in embodiment and embodiment in the application can mutual combination in any.
Embodiment one
Fig. 1 is the structure chart of the adjustable Raman spectrum system of spatial offset in embodiment one, as shown in Fig. 2 this Raman
Spectrogrph includes：Laser instrument 1, optical path switching device 2, focused acquisition optical system 3, coupling optical system 4, fibre bundle 5, at least
One spectrogrph 6.
Laser instrument 1 is used for the parallel laser beam of output collimation.
Optical path switching device 2 is arranged on the output light path of the output laser beam of laser instrument 1, for carrying out to laser beam
Reflection.
Aggregation collection optical system 3 is arranged at light path in the way of the laser beam reflected perpendicular to optical path switching device 2
The side of conversion equipment 2, is parallel for assembling the light beam after optical path switching device 2 reflects and gathering signal beams and collimate
Light beam.Optical path switching device 2 is typically dichroism edge filter, for reflection laser light beam, transmission signal light beam.
Coupling optical system 4 is arranged at light path converting in the way of the laser beam transmitted perpendicular to optical path switching device 2
The opposite side of device 2, for carrying out the light beam for receiving to pool as and be coupled to the input of fibre bundle 5.
To focus optical system, coupling optical system 4 is varifocal optical system to focused acquisition optical system 3.
Spectrogrph 6 is imaging spectrometer, and the number of spectrogrph 6 is 1.The input of fibre bundle 5 is arranged at coupling optical
The focal plane of system 4, the optical fiber of the input of fibre bundle 5 is annularly distributed, and center arranges at least one optical fiber, is placed in zero
The position of degree visual field, for gathering raman spectral signal when spatial offset is zero, outer ring position arranges many and center
Optical fiber distance it is identical and constitute the optical fiber of circular arrangement, for gather space displacement amount for R when raman spectral signal；
The outfan connection spectrogrph 6 of fibre bundle 5.The radius at outer shroud fiber distance center is R0, R0For the geometrical offset amount of fibre bundle, R
For R0Through focused acquisition optical system 3 and the size of the optical amplifier of coupling optical system 4 or the picture of diminution, focused acquisition optics
System 3 is designed as varifocal optical system, and its focal length is that f3 is adjustable, and the technology of varifocal optical system is existing mature technology, here
It is not described in detail, to determine focal length optics, its focal length is f4 to coupling optical system 4, then space displacement amount meets R=R0*
F4/f3, by f4Adjust the measurement for being capable of achieving different spaces displacements.
Fibre bundle 5 has an outfan, and the optical fiber of the outfan of fibre bundle 5 is linearly distributed and with spectrogrph 6
Slit is coupled, and the other end of the central optical fiber of the input of fibre bundle 5 is located at one end of the outfan of fibre bundle 5.This optical fiber can
To arrange with adjacent close fiber optic, in order to preferably distinguish with other optical fiber, it is also possible to stay 100-200um with adjacent optical fiber
Interval.
Spectrogrph 6 is imaging spectrometer, the fiber array at the slit of spectrogrph 6 can be imaged on into its area array sensor battle array
On row, and can separate on Spatial Dimension.The spectrogrph can be when simultaneously analysis space side-play amount be zero raman spectral signal, and
SORS raman spectral signals when spatial offset is R, two signals fall in the diverse location of its planar array detector.
Raman spectrometer can also include being arranged between laser instrument 1 and optical path switching device 2 except above-mentioned building block
The purification optical filter vertical with the laser beam of laser instrument 1, for purifying optical maser wavelength composition, filter light disturbance；May be used also
So that including the notch filtering light piece being arranged between optical path switching device 2 and coupling optical system 4, the Ruili for intercepting collection dissipates
Scattered light is penetrated, the spuious optical signal of jammr band is eliminated.
Embodiment two
Fig. 2 is the structure chart of the adjustable Raman spectrum system of spatial offset in embodiment two, as shown in figure 3, this Raman
Spectroscopic system includes：This Raman spectrometer includes：Laser instrument 1, optical path switching device 2, focused acquisition optical system 3, coupling light
System 4,5, two spectrogrphs 6 of fibre bundle.
Embodiment two is with the difference of embodiment one, not using imaging spectrometer, in order to gather zero offset letter simultaneously
Number and SORS signals, spectrogrph 6 is non-imaging spectrometer in embodiment two, and quantity is 2.Spectrogrph 6 includes the first light
Spectrometer and the second spectrogrph, fibre bundle 5 is Y shape optical fiber beam, and with two outfans, the optical fiber of the first outfan is linearly distributed
And couple with the slit of the first spectrogrph, the quantity of the optical fiber of the first outfan is the outer ring position of the input of fibre bundle 5
Optical fiber quantity, for gathering SORS signals；The optical fiber of the second outfan is linearly distributed and narrow with the second spectrogrph
Slot coupling, the quantity of the optical fiber of the second outfan is the quantity of the optical fiber of the center of the input of fibre bundle 5, for gathering
Zero offset signal.
Embodiment three
Fig. 3 is the structure chart of the adjustable Raman spectrum system of spatial offset in embodiment three, Raman light in embodiment three
The difference of the Raman spectrum system in spectra system and embodiment one is that focused acquisition optical system 3 is Zoom optical system
System, coupling optical system 4 is to focus optical system.
Example IV
Fig. 4 is the structure chart of the adjustable Raman spectrum system of spatial offset in example IV, Raman light in example IV
The difference of the Raman spectrum system in spectra system and embodiment two is that focused acquisition optical system 3 is Zoom optical system
System, coupling optical system 4 is to focus optical system.
Embodiment five
The difference of the Raman spectrum system in embodiment five in Raman spectrum system and embodiment one is that focusing is adopted
Collection optical system 3 and coupling optical system 4 are varifocal optical system.
Embodiment six
The difference of the Raman spectrum system in embodiment six in Raman spectrum system and embodiment two is that focusing is adopted
Collection optical system 3 and coupling optical system 4 are varifocal optical system.
It is each attached when focused acquisition optical system 3 or coupling optical system 4 are varifocal optical system in the various embodiments described above
What is illustrated in figure is simplest varifocal optical system, specifically includes zoom microscope group, and zoom microscope group includes that two identicals are convex
Lens and the concavees lens between two convex lenss, by moving up and down zoom microscope group continuous vari-focus are capable of achieving.Accompanying drawing is only made
Signal is used, and actual varifocal optical system is increasingly complex varifocal optical system.When coupling optical system 4 is Zoom optical
During system, the input that need to ensure fibre bundle 5 is always positioned at the focal plane position of coupling optical system 4.
Fig. 5 is the flow chart of the Raman spectroscopic detection method for using the adjustable Raman spectrum system of above-mentioned spatial offset,
The method includes：
Step 501, by sample the focal point of focused acquisition optical system 3 is positioned over；It is parallel by the transmitting collimation of laser instrument 1
Laser beam；
The laser beam for receiving is reflexed to focused acquisition optical system 3 by step 502, optical path switching device 2, and focusing is adopted
The laser beam that optical path switching device 2 reflects is gathered in collection optical system 3 focal point for being placed with sample, and is transmitted from sample
Back scattered light beam, kernel of this light beam comprising central vision skew Raman scattering light beam and non-central visual field have space inclined
The spatial deviation Raman scattering light beam of shifting amount；
Step 503, coupling optical system 4 carries out the light beam for receiving to pool as and be coupled to the input of fibre bundle 5
End, the light beam at different visual fields is converged to respectively the diverse location of the input of fibre bundle 5, specifically makes central optical fiber correspondence
Central vision makes the non-central visual field of outer shroud fibre bundle correspondence so as to coupled room so as to couple kernel skew Raman scattering light beam
Skew Raman scattering light beam；
Step 504, by spectrogrph 6 spectral signal is gathered；If current spatial side-play amount does not meet collection when requiring, root
The size of under type adjustment space skew according to this is gathered with the Raman spectrum for realizing different spaces displacement：Focused acquisition optical system
System 3 is varifocal optical system and when coupling optical system 4 is to focus optical system, adjusts Jiao of focused acquisition optical system 3
Away from being acquired again；Focused acquisition optical system 3 is to focus optical system and coupling optical system 4 is varifocal optical system
When, the focal length for adjusting coupling optical system 4 is acquired again；Focused acquisition optical system 3 is varifocal optical system and coupling
When conjunction optical system 4 is varifocal optical system, the focal length for adjusting focused acquisition optical system 3 and coupling optical system 4 enters again
Row collection.
Wherein, focal length f3 and the coupling of the size of space displacement amount R by focused acquisition optical system 3 in step 602
The focal length f4 and optical fiber outer shroud radius R of optical system 40Determined, met R=R0*f4/f3。
When spectrogrph 6 is imaging spectrometer, the number of spectrogrph 6 is 1, and fibre bundle 5 has an outfan, fibre bundle
The optical fiber of 5 outfan is linearly distributed and couples with the slit of spectrogrph 6, the central optical fiber of the input of fibre bundle 5
The other end is located at one end of the outfan of fibre bundle 5.
When spectrogrph 6 is non-imaged spectrogrph, the number of spectrogrph 6 is 2, and spectrogrph 6 includes the first spectrogrph and the
Two spectrogrphs, fibre bundle 5 is that Y shape optical fiber beam has two outfans, and the optical fiber of the first outfan is linearly distributed and with the
The slit coupling of one spectrogrph, the quantity of the optical fiber of the first outfan is the optical fiber of the outer ring position of the input of fibre bundle 5
Quantity, the optical fiber of the second outfan is linearly distributed and couples with the slit of the second spectrogrph, the optical fiber of the second outfan
Quantity is the quantity of the optical fiber of the center of the input of fibre bundle 5.
Raman spectroscopic detection method proposed by the present invention, moving sampling optical fiber or can increase sampling optical fiber
In the case of quantity, the continuously adjustable of spatial offset is conveniently realized.
Descriptions above can combine individually or in a variety of ways enforcement, and these variants all exist
Within protection scope of the present invention.
One of ordinary skill in the art will appreciate that all or part of step in said method can be instructed by program
Related hardware is completed, and described program can be stored in computer-readable recording medium, such as read only memory, disk or CD
Deng.Alternatively, all or part of step of above-described embodiment can also be realized using one or more integrated circuits, accordingly
Ground, each module/unit in above-described embodiment can be realized in the form of hardware, it would however also be possible to employ the shape of software function module
Formula is realized.The present invention is not restricted to the combination of the hardware and software of any particular form.
It should be noted that herein, term " including ", "comprising" or its any other variant are intended to non-row
His property is included, so that not only include those key elements including the article or equipment of a series of key elements, but also including not having
There are other key elements being expressly recited, or also include the key element intrinsic for this article or equipment.Without more limits
In the case of system, the key element limited by sentence " including ... ", it is not excluded that in the article or equipment including the key element
Also there is other identical element.
Above example only to illustrate technical scheme and unrestricted, reference only to preferred embodiment to this
It is bright to be described in detail.It will be understood by those within the art that, technical scheme can be modified
Or equivalent, without deviating from the spirit and scope of technical solution of the present invention, the claim model in the present invention all should be covered
In the middle of enclosing.
Claims (9)
1. the adjustable Raman spectrum system of a kind of spatial offset, it is characterised in that include：Laser instrument (1), optical path switching device
(2), focused acquisition optical system (3), coupling optical system (4), fibre bundle (5), an at least spectrogrph (6)；
The laser instrument (1) is for the parallel laser beam of output collimation；
The optical path switching device (2) is arranged on the output light path of the laser instrument (1) output laser beam, for described
Laser beam is reflected；
Aggregation collection optical system (3) is set in the way of the laser beam reflected perpendicular to the optical path switching device (2)
The side of the optical path switching device (2) is placed in, for assembling the light beam after the optical path switching device (2) reflects and gathering
Signal beams are simultaneously collimated as collimated light beam；
The coupling optical system (4) is arranged in the way of the laser beam transmitted perpendicular to the optical path switching device (2)
The opposite side of the optical path switching device (2), for carrying out the light beam for receiving to pool as and be coupled to fibre bundle (5)
Input；
The input of the fibre bundle (5) is arranged at the focal plane of the coupling optical system (4), the fibre bundle (5)
The optical fiber of input is annularly distributed, and center arranges at least one optical fiber, and outer ring position arranges the optical fiber of many and center
Distance it is identical and constitute the optical fiber of circular arrangement；The outfan of the fibre bundle (5) connects the spectrogrph (6).
2. the adjustable Raman spectrum system of spatial offset as claimed in claim 1, it is characterised in that
To focus optical system, the coupling optical system (4) is varifocal optical system to the focused acquisition optical system (3)；
Or, the focused acquisition optical system (3) is varifocal optical system, and the coupling optical system (4) is to focus optics
System；
Or, the focused acquisition optical system (3) and the coupling optical system (4) are varifocal optical system.
3. the adjustable Raman spectrum system of spatial offset as claimed in claim 1 or 2, it is characterised in that
The spectrogrph (6) for imaging spectrometer when, the number of the spectrogrph (6) is 1, and the fibre bundle (5) is with one
Individual outfan, the optical fiber of the outfan of the fibre bundle (5) is linearly distributed and couples with the slit of the spectrogrph (6),
The other end of the central optical fiber of the input of the fibre bundle (5) is located at one end of the outfan of the fibre bundle (5).
4. the adjustable Raman spectrum system of spatial offset as claimed in claim 1 or 2, it is characterised in that
The spectrogrph (6) for non-imaged spectrogrph when, the number of the spectrogrph (6) is 2, and the spectrogrph (6) includes
First spectrogrph and the second spectrogrph, the fibre bundle (5) has two outfans, the light of the first outfan for Y shape optical fiber beam
Fibre is linearly distributed and couples with the slit of the first spectrogrph, and the quantity of the optical fiber of the first outfan is the fibre bundle (5)
Input outer ring position optical fiber quantity, the optical fiber of the second outfan it is linearly distributed and with second spectrogrph
Slit coupling, the quantity of the optical fiber of the second outfan for the optical fiber of the center of the input of the fibre bundle (5) number
Amount.
5. the adjustable Raman spectrum system of spatial offset as claimed in claim 1 or 2, it is characterised in that
The Raman spectrometer also include be arranged between the laser instrument (1) and the optical path switching device (2) with it is described
The vertical purification optical filter of the laser beam of laser instrument (1)；
Also include the notch filtering light piece being arranged between the optical path switching device (2) and coupling optical system (4).
6. usage right requires the Raman of the adjustable Raman spectrum system of spatial offset in 1 to 5 described in any claim
Optical spectrum detecting method, it is characterised in that include：
Sample is positioned over into the focal point of focused acquisition optical system (3)；The parallel laser light of collimation is launched by laser instrument (1)
Beam；
The laser beam for receiving is reflexed to focused acquisition optical system (3), the focused acquisition light by optical path switching device (2)
The laser beam that the optical path switching device (2) reflects is gathered in system (3) focal point for being placed with sample, and transmit from
The back scattered light beam of sample, kernel of this light beam comprising central vision skew Raman scattering light beam and non-central visual field have sky
Between side-play amount spatial deviation Raman scattering light beam；
The coupling optical system (4) carries out the light beam for receiving to pool as and be coupled to the input of fibre bundle (5), will
Light beam at different visual fields converges to respectively the diverse location of the input of fibre bundle (5), in specifically making central optical fiber correspondence
Heart visual field makes the non-central visual field of outer shroud fibre bundle correspondence so as to coupled room is inclined so as to couple kernel skew Raman scattering light beam
Move Raman scattering light beam；
Spectral signal is gathered by spectrogrph (6)；If current spatial side-play amount does not meet collection when requiring, according in the following manner
The size of adjustment space skew is gathered with the Raman spectrum for realizing different spaces displacement：
The focused acquisition optical system (3) is the varifocal optical system and coupling optical system (4) is to focus optical system
During system, the focal length for adjusting the focused acquisition optical system (3) is acquired again；
The focused acquisition optical system (3) is to focus optical system and the coupling optical system (4) is Zoom optical system
During system, the focal length for adjusting the coupling optical system (4) is acquired again；
The focused acquisition optical system (3) is the varifocal optical system and coupling optical system (4) is Zoom optical system
During system, the focal length for adjusting the focused acquisition optical system (3) and the coupling optical system (4) is acquired again.
7. usage right requires the Raman spectroscopic detection method described in 6, it is characterised in that
The size of the space displacement amount by focused acquisition optical system (3) focal length f3 and the coupling optical system (4)
Focal length f4 and optical fiber outer shroud radius R0Determined, met R=R0* f4/f3, wherein R are the space displacement amount.
8. usage right requires the Raman spectroscopic detection method described in 6, it is characterised in that
The spectrogrph (6) for imaging spectrometer when, the number of the spectrogrph (6) is 1, and the fibre bundle (5) is with one
Individual outfan, the optical fiber of the outfan of the fibre bundle (5) is linearly distributed and couples with the slit of the spectrogrph (6),
The other end of the central optical fiber of the input of the fibre bundle (5) is located at one end of the outfan of the fibre bundle (5).
9. usage right requires the Raman spectroscopic detection method described in 6, it is characterised in that
The spectrogrph (6) for non-imaged spectrogrph when, the number of the spectrogrph (6) is 2, and the spectrogrph (6) includes
First spectrogrph and the second spectrogrph, the fibre bundle (5) has two outfans, the light of the first outfan for Y shape optical fiber beam
Fibre is linearly distributed and couples with the slit of the first spectrogrph, and the quantity of the optical fiber of the first outfan is the fibre bundle (5)
Input outer ring position optical fiber quantity, the optical fiber of the second outfan it is linearly distributed and with second spectrogrph
Slit coupling, the quantity of the optical fiber of the second outfan for the optical fiber of the center of the input of the fibre bundle (5) number
Amount.
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