CN106596500B - A kind of adjustable Raman spectrum system of spatial offset and Raman spectroscopic detection method - Google Patents
A kind of adjustable Raman spectrum system of spatial offset and Raman spectroscopic detection method Download PDFInfo
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- 238000001069 Raman spectroscopy Methods 0.000 title claims abstract description 48
- 238000001237 Raman spectrum Methods 0.000 title claims abstract description 44
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- 238000004793 spatially offset Raman spectroscopy Methods 0.000 description 9
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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
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/65—Raman scattering
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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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- 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
- G01N2201/06—Illumination; Optics
- G01N2201/068—Optics, miscellaneous
Abstract
The invention discloses a kind of adjustable Raman spectrum system of spatial offset and Raman spectroscopic detection method, this Raman spectrum system includes laser (1), optical path switching device (2), focused acquisition optical system (3), coupling optical system (4), fiber optic bundle (5), an at least spectrometer (6).The input terminal of fiber optic bundle (5) is set to the focal plane of the coupling optical system (4), the optical fiber of the input terminal of the fiber optic bundle (5) is annularly distributed, at least one optical fiber is set at center, and more optical fiber that are identical at a distance from the optical fiber at center and constituting circular arrangement are arranged in outer ring position；The output end of the fiber optic bundle (5) connects the spectrometer (6).The present invention can conveniently realize the continuously adjustable of the spatial offset of Raman spectrometer in the case where not needing mobile sampling optical fiber or increasing the quantity of sampling optical fiber.
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 technique
Traditional Raman spectrum can only detect the superficial information of sample or can only penetrate transparent surface layer to detect bottom.
And novel space displacement Raman spectrum (Spatially Offset Raman Spectroscopy, abbreviation SORS) technology can
With several 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 multilayer or opaque packaging material, for example 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, still
Penetration depth is very shallow (such as several hundred microns of thick biological tissues).Recently, it with the birth of space displacement Raman spectrum SORS, wears
Saturating depth considerably increases.
Space displacement Raman spectrum SORS is a kind of patent Raman technology (referenced patent number: with reference to special that Englishman proposes
Benefit number: US7652763, CN101115987, EP1828753, US7911604, GB2457212, AU2005313145,
JP5449712007), the raman spectral signal that high quality can be detected through thick coating, can explicitly distinguish material
With the Raman spectrum of container, identify while realizing material and container.
Space displacement Raman spectrum can obtain the layer-by-layer Raman spectrum of diffusing scattering sample appropriate, and laser power
It is lower.SORS Method And Principle is to leave collection Raman signal, displacement S at illuminated laser spot certain displacement in sample surfaces to get over
Greatly, the contribution of deeper sample is more in gained Raman signal.The case where fluorescence is also similar.
SORS not only has the chemical specificity of Raman spectrum, and can provide the information of sample Deep, have it is huge and
Broad application prospect, can be widely used in non-intruding bone Raman spectrum, cancer diagnosis tool exploitation, detection disperse jet modling
Expect the counterfeit drug in bottle, mail safety check, detect the fields such as liquid and solid-state explosive.
In the prior art, single fiber optic bundle can only design fixed spatial offset, and in practical application, different wears
Spatial offset requirement corresponding to saturating depth is not identical, in order to realize the sampling to different offsets, 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
Sufficiently large offset ranges are covered, these means will lead to fiber optic bundle design complexity or greatly increase the quantity of sensor.
Summary of the invention
In order to solve above-mentioned technical problem in the prior art, the present invention provides a kind of adjustable Ramans of spatial offset
Spectroscopic system and Raman spectroscopic detection method.
The present invention provides a kind of adjustable Raman spectrum systems of spatial offset, comprising: laser, light path converting dress
It sets, focused acquisition optical system, coupling optical system, fiber optic bundle, at least a spectrometer；
The laser, which is used to export, collimates parallel laser beam；
The optical path switching device is set on the output light path of the laser output laser beam, for swashing to described
Light light beam is reflected；
The aggregation acquisition optical system is arranged in a manner 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 acquiring signal beams
And collimating is collimated light beam；
The coupling optical system is set to institute in a manner of the laser beam transmitted perpendicular to the optical path switching device
The other side for stating optical path switching device, for the light beam received to be carried out convergence imaging and is coupled to the input terminal of fiber optic bundle；
The input terminal of the fiber optic bundle is set to the focal plane of the coupling optical system, the input terminal of the fiber optic bundle
Optical fiber be annularly distributed, at least one optical fiber is set at center, and outer ring position is arranged more at a distance from the optical fiber at center
Optical fiber that is identical and constituting circular arrangement；The output end of the fiber optic bundle connects the spectrometer.
The above-mentioned adjustable Raman spectrum system of spatial offset also has the following characteristics that
The focused acquisition optical system is fixed-focus optical system, and the coupling optical system is varifocal optical system；
Alternatively, the focused acquisition optical system is varifocal optical system, the coupling optical system is fixed-focus optical system
System；
Alternatively, the focused acquisition optical system and the coupling optical system are varifocal optical system.
The above-mentioned adjustable Raman spectrum system of spatial offset also has the following characteristics that
When the spectrometer is imaging spectrometer, the number of the spectrometer is 1, and the fiber optic bundle has an output
End, the optical fiber of the output end of the fiber optic bundle is linearly distributed and couples with the slit of the spectrometer, the fiber optic bundle
The other end of the central optical fiber of input terminal is located at one end of the output end of the fiber optic bundle.
The above-mentioned adjustable Raman spectrum system of spatial offset also has the following characteristics that
When the spectrometer is non-imaged spectrometer, the number of the spectrometer is 2, and the spectrometer includes the first light
Spectrometer and the second spectrometer, the fiber optic bundle are Y shape optical fiber beam tool there are two output end, linear point of the optical fiber of the first output end
It cloth and is coupled with the slit of the first spectrometer, the quantity of the optical fiber of the first output end is the outer ring of the input terminal of the fiber optic bundle
The optical fiber of the quantity of the optical fiber of position, second output terminal is linearly distributed and couples with the slit of second spectrometer, the
The quantity of the optical fiber of two output ends is the quantity of the optical fiber of the center of the input terminal of the fiber optic bundle.
The above-mentioned adjustable Raman spectrum system of spatial offset also has the following characteristics that
The Raman spectrometer further includes being set to swashing between the laser and the optical path switching device with described
The vertical purification optical filter of the laser beam of light device；
It further include the notch filtering light piece being set between the optical path switching device and coupling optical system.
The present invention also provides a kind of Raman spectroscopic detection methods, comprising:
Sample is placed in the focal point of focused acquisition optical system；Parallel laser light is collimated by laser transmitting
Beam；
The laser beam received is reflected into 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 the focal point for being placed with sample by system, and is transmitted and scattered from sample
The light beam returned, this light beam include that the kernel offset Raman scattering light beam of central vision and non-central visual field have spatial offset
Spatial offset Raman scattering light beam；
The light beam received is carried out convergence imaging and is coupled to the input terminal of fiber optic bundle by the coupling optical system, will not
The different location for converging to the input terminal of fiber optic bundle respectively with the light beam at visual field, specifically enables central optical fiber correspond to central vision
To couple kernel offset Raman scattering light beam, outer ring fiber optic bundle is enabled to correspond to non-central visual field to which coupled room deviates Raman
Scattered beam；
Pass through spectrometer collection spectral signal；If current spatial offset does not meet acquisition when requiring, according to lower section
The size of formula adjustment space offset is acquired with the Raman spectrum for realizing different spaces displacement:
The focused acquisition optical system is varifocal optical system and the coupling optical system is fixed-focus optical system
When, the focal length for adjusting the focused acquisition optical system is acquired again；
The focused acquisition optical system is fixed-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 varifocal optical system and the 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 following characteristics that
The size of the space displacement amount is by the focal length f3 of focused acquisition optical system and the coke of the coupling optical system
Away from f4 and optical fiber outer ring radius R0It is determined, meets R=R0* f4/f3, wherein R is the space displacement amount.
Above-mentioned Raman spectroscopic detection method also has the following characteristics that
When the spectrometer is imaging spectrometer, the number of the spectrometer is 1, and the fiber optic bundle has an output
End, the optical fiber of the output end of the fiber optic bundle is linearly distributed and couples with the slit of the spectrometer, the fiber optic bundle
The other end of the central optical fiber of input terminal is located at one end of the output end of the fiber optic bundle.
Above-mentioned Raman spectroscopic detection method also has the following characteristics that
When the spectrometer is non-imaged spectrometer, the number of the spectrometer is 2, and the spectrometer includes the first light
Spectrometer and the second spectrometer, the fiber optic bundle are Y shape optical fiber beam tool there are two output end, linear point of the optical fiber of the first output end
It cloth and is coupled with the slit of the first spectrometer, the quantity of the optical fiber of the first output end is the outer ring of the input terminal of the fiber optic bundle
The optical fiber of the quantity of the optical fiber of position, second output terminal is linearly distributed and couples with the slit of second spectrometer, the
The quantity of the optical fiber of two output ends is the quantity of the optical fiber of the center of the input terminal of the fiber optic bundle.
Raman spectroscopic detection method proposed by the present invention can not need mobile sampling optical fiber or increase sampling optical fiber
In the case where quantity, the continuously adjustable of the spatial offset of Raman spectrometer is conveniently realized.
Detailed description of the invention
The attached drawing for constituting a part of the invention is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations 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 using the Raman spectroscopic detection method of the adjustable Raman spectrum system of above-mentioned spatial offset.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.It needs
Illustrate, in the absence of conflict, the features in the embodiments and the embodiments of the present application can mutual any combination.
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
Spectrometer includes: laser 1, optical path switching device 2, focused acquisition optical system 3, coupling optical system 4, fiber optic bundle 5, at least
One spectrometer 6.
Laser 1, which is used to export, collimates parallel laser beam.
Optical path switching device 2 is set to laser 1 and exports on the output light path of laser beam, for carrying out to laser beam
Reflection.
Aggregation acquisition optical system 3 is set to optical path in a manner 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 acquiring signal beams and collimate
Light beam.Optical path switching device 2 is typically dichroism edge filter, is used for reflection laser light beam, transmission signal light beam.
Coupling optical system 4 is set to light path converting in a manner of the laser beam transmitted perpendicular to optical path switching device 2
The other side of device 2, for the light beam received to be carried out convergence imaging and is coupled to the input terminal of fiber optic bundle 5.
Focused acquisition optical system 3 is fixed-focus optical system, and coupling optical system 4 is varifocal optical system.
Spectrometer 6 is imaging spectrometer, and the number of spectrometer 6 is 1.The input terminal of fiber optic bundle 5 is set to coupling optical
The optical fiber of the focal plane of system 4, the input terminal of fiber optic bundle 5 is annularly distributed, and at least one optical fiber is arranged at center, is placed in zero
The position for spending visual field, for acquiring raman spectral signal when spatial offset is zero, outer ring position is arranged at more and center
Optical fiber distance it is identical and constitute the optical fiber of circular arrangement, for acquiring raman spectral signal when space displacement amount is R；
The output end of fiber optic bundle 5 connects spectrometer 6.The radius at outer ring fiber distance center is R0, R0For the geometrical offset amount of fiber optic bundle, R
For R0By the size of focused acquisition optical system 3 and 4 optical amplifier of coupling optical system or the picture of diminution, focused acquisition optics
System 3 is designed as varifocal optical system, and 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, coupling optical system 4 is to determine focal length optics, and focal length f4, then space displacement amount meets R=R0*
F4/f3, by f4Adjusting the measurement of different spaces displacement can be realized.
Fiber optic bundle 5 has an output end, and the optical fiber of the output end of fiber optic bundle 5 is linearly distributed and with spectrometer 6
Slit coupling, the other end of the central optical fiber of the input terminal of fiber optic bundle 5 are located at one end of the output end of fiber optic bundle 5.This optical fiber can
To arrange with adjacent close fiber optic, in order to preferably distinguish with other optical fiber, 100-200um can also be stayed with adjacent optical fiber
Interval.
Spectrometer 6 is imaging spectrometer, and the fiber array at the slit of spectrometer 6 can be imaged on to its area array sensor battle array
On column, and it can be separated on Spatial Dimension.The spectrometer can raman spectral signal of analysis space offset when being zero simultaneously, and
SORS raman spectral signal when spatial offset is R, two signals fall in the different location of its planar array detector.
Raman spectrometer can also include being set between laser 1 and optical path switching device 2 in addition to above-mentioned building block
The purification optical filter vertical with the laser beam of laser 1 filter out light disturbance for purifying optical maser wavelength ingredient；May be used also
To include the notch filtering light piece being set between optical path switching device 2 and coupling optical system 4, the Ruili for obstructing acquisition dissipates
Scattering 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: that this Raman spectrometer includes: laser 1, optical path switching device 2, focused acquisition optical system 3, coupling light
5, two system 4, fiber optic bundle spectrometers 6.
Embodiment two and the difference of embodiment one are, do not use imaging spectrometer, in order to acquire zero offset letter simultaneously
Number and SORS signal, spectrometer 6 is non-imaging spectrometer in embodiment two, and quantity is 2.Spectrometer 6 includes the first light
Spectrometer and the second spectrometer, fiber optic bundle 5 are Y shape optical fiber beam, and for tool there are two output end, the optical fiber of the first output end is linearly distributed
And it is coupled with the slit of the first spectrometer, the quantity of the optical fiber of the first output end is the outer ring position of the input terminal of fiber optic bundle 5
Optical fiber quantity, for acquiring SORS signal；The optical fiber of second output terminal is linearly distributed and narrow with the second spectrometer
Slot coupling, the quantity of the optical fiber of second output terminal is the quantity of the optical fiber of the center of the input terminal of fiber optic bundle 5, for acquiring
Zero bias shifting 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
Raman spectrum system in spectra system and embodiment one the difference is that, focused acquisition optical system 3 is Zoom optical system
System, coupling optical system 4 are fixed-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
Raman spectrum system in spectra system and embodiment two the difference is that, focused acquisition optical system 3 is Zoom optical system
System, coupling optical system 4 are fixed-focus optical system.
Embodiment five
Raman spectrum system in embodiment five in Raman spectrum system and embodiment one the difference is that, focusing is adopted
Collect optical system 3 and coupling optical system 4 is varifocal optical system.
Embodiment six
Raman spectrum system in embodiment six in Raman spectrum system and embodiment two the difference is that, focusing is adopted
Collect optical system 3 and coupling optical system 4 is 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 two identical convex
Lens and the concavees lens between two convex lenses can realize continuous vari-focus by moving up and down zoom microscope group.Attached 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
When system, it need to guarantee that the input terminal of fiber optic bundle 5 is always positioned at the focal plane position of coupling optical system 4.
Fig. 5 be using the flow chart of the Raman spectroscopic detection method of the adjustable Raman spectrum system of above-mentioned spatial offset,
The method includes:
Step 501, sample is placed in the focal point of focused acquisition optical system 3；It is parallel by the transmitting collimation of laser 1
Laser beam；
Step 502, the laser beam received is reflected into focused acquisition optical system 3 by optical path switching device 2, and focusing is adopted
The laser beam that optical path switching device 2 reflects is gathered in the focal point for being placed with sample by collection optical system 3, and is transmitted from sample
Back scattered light beam, this light beam include that the kernel offset Raman scattering light beam of central vision and non-central visual field have space inclined
The spatial offset Raman scattering light beam of shifting amount；
Step 503, the light beam received is carried out convergence imaging and is coupled to the input of fiber optic bundle 5 by coupling optical system 4
Light beam at different visual fields, is converged to the different location of the input terminal of fiber optic bundle 5 by end respectively, specifically enables central optical fiber corresponding
Central vision enables outer ring fiber optic bundle correspond to non-central visual field to coupled room to couple kernel offset Raman scattering light beam
Deviate Raman scattering light beam；
Step 504, spectral signal is acquired by spectrometer 6；If current spatial offset does not meet acquisition when requiring, root
The size of under type adjustment space offset is acquired accordingly with the Raman spectrum for realizing different spaces displacement: focused acquisition optical system
When system 3 is varifocal optical system and coupling optical system 4 is fixed-focus optical system, the coke of focused acquisition optical system 3 is adjusted
Away from being acquired again；Focused acquisition optical system 3 is fixed-focus optical system and coupling optical system 4 is varifocal optical system
When, the focal length of adjustment coupling optical system 4 is acquired again；Focused acquisition optical system 3 is varifocal optical system and coupling
Optical system 4 is closed when being varifocal optical system, adjust the focal length of focused acquisition optical system 3 and coupling optical system 4 again into
Row acquisition.
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 ring radius R of optical system 40It is determined, meets R=R0*f4/f3。
When spectrometer 6 is imaging spectrometer, the number of spectrometer 6 is 1, and fiber optic bundle 5 has an output end, fiber optic bundle
The optical fiber of 5 output end is linearly distributed and couples with the slit of spectrometer 6, the central optical fiber of the input terminal of fiber optic bundle 5
The other end is located at one end of the output end of fiber optic bundle 5.
When spectrometer 6 is non-imaged spectrometer, the number of spectrometer 6 is 2, and spectrometer 6 includes the first spectrometer and the
Two spectrometers, fiber optic bundle 5 are Y shape optical fiber beam tool there are two output end, and the optical fiber of the first output end is linearly distributed and with the
The slit of one spectrometer couples, and the quantity of the optical fiber of the first output end is the optical fiber of the outer ring position of the input terminal of fiber optic bundle 5
The optical fiber of quantity, second output terminal is linearly distributed and couples with the slit of the second spectrometer, the optical fiber of second output terminal
Quantity is the quantity of the optical fiber of the center of the input terminal of fiber optic bundle 5.
Raman spectroscopic detection method proposed by the present invention can not need mobile sampling optical fiber or increase sampling optical fiber
In the case where quantity, the continuously adjustable of spatial offset is conveniently realized.
Descriptions above can combine implementation individually or in various ways, and these variants all exist
Within protection scope of the present invention.
Those of ordinary skill in the art will appreciate that all or part of the steps in the above method can be instructed by program
Related hardware is completed, and described program can store in computer readable storage medium, such as read-only memory, disk or CD
Deng.Optionally, one or more integrated circuits also can be used to realize, accordingly in all or part of the steps of above-described embodiment
Ground, each module/unit in above-described embodiment can take the form of hardware realization, can also use the shape of software function module
Formula is realized.The present invention is not limited to the combinations of the hardware and software of any particular form.
It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that including the article of a series of elements or equipment not only includes those elements, but also including not having
There is the other element being expressly recited, or further includes for this article or the intrinsic element of equipment.Do not limiting more
In the case where system, the element that is limited by sentence " including ... ", it is not excluded that in the article or equipment for including the element
There is also other identical elements.
The above examples are only used to illustrate the technical scheme of the present invention and are not limiting, reference only to preferred embodiment to this hair
It is bright to be described in detail.Those skilled in the art should understand that can modify to technical solution of the present invention
Or equivalent replacement should all cover in claim model of the invention without departing from the spirit and scope of the technical solution of the present invention
In enclosing.
Claims (8)
1. a kind of adjustable Raman spectrum system of spatial offset characterized by comprising laser (1), optical path switching device
(2), focused acquisition optical system (3), coupling optical system (4), fiber optic bundle (5), an at least spectrometer (6)；
The laser (1), which is used to export, collimates parallel laser beam；
The optical path switching device (2) is set on the output light path of the laser (1) output laser beam, for described
Laser beam is reflected；
The focused acquisition optical system (3) is set in a manner of the laser beam reflected perpendicular to the optical path switching device (2)
It is placed in the side of the optical path switching device (2), for focusing the light beam after the optical path switching device (2) are reflected and adopting
Integrate signal beams and collimates as collimated light beam；
The coupling optical system (4) is set in a manner of the laser beam transmitted perpendicular to the optical path switching device (2)
The other side of the optical path switching device (2), for the light beam received to be carried out convergence imaging and is coupled to fiber optic bundle (5)
Input terminal；
The input terminal of the fiber optic bundle (5) is set to the focal plane of the coupling optical system (4), the fiber optic bundle (5)
The optical fiber of input terminal is annularly distributed, and at least one optical fiber is arranged at center, and more and the optical fiber at center are arranged in outer ring position
Distance it is identical and constitute the optical fiber of circular arrangement；The output end of the fiber optic bundle (5) connects the spectrometer (6),
Wherein, the focused acquisition optical system (3) is fixed-focus optical system, and the coupling optical system (4) is Zoom optical
System；
Alternatively, the focused acquisition optical system (3) is varifocal optical system, the coupling optical system (4) is fixed-focus optics
System；
Alternatively, the focused acquisition optical system (3) and the coupling optical system (4) are varifocal optical system.
2. the adjustable Raman spectrum system of spatial offset as described in claim 1, which is characterized in that
When the spectrometer (6) is imaging spectrometer, the number of the spectrometer (6) is 1, and the fiber optic bundle (5) has one
The optical fiber of a output end, the output end of the fiber optic bundle (5) is linearly distributed and couples with the slit of the spectrometer (6),
The other end of the central optical fiber of the input terminal of the fiber optic bundle (5) is located at one end of the output end of the fiber optic bundle (5).
3. the adjustable Raman spectrum system of spatial offset as described in claim 1, which is characterized in that
When the spectrometer (6) is non-imaged spectrometer, the number of the spectrometer (6) is 2, and the spectrometer (6) includes
First spectrometer and the second spectrometer, the fiber optic bundle (5) are that there are two output end, the light of the first output end for Y shape optical fiber beam tool
Fibre is linearly distributed and couples with the slit of the first spectrometer, and the quantity of the optical fiber of the first output end is the fiber optic bundle (5)
Input terminal outer ring position optical fiber quantity, the optical fiber of second output terminal it is linearly distributed and with second spectrometer
Slit coupling, the quantity of the optical fiber of second output terminal is the number of the optical fiber of the center of the input terminal of the fiber optic bundle (5)
Amount.
4. the adjustable Raman spectrum system of spatial offset as described in claim 1, which is characterized in that
The Raman spectrometer further include be set between the laser (1) and the optical path switching device (2) with it is described
The vertical purification optical filter of the laser beam of laser (1)；
It further include the notch filtering light piece being set between the optical path switching device (2) and coupling optical system (4).
5. using the Raman of the adjustable Raman spectrum system of spatial offset described in any claim in Claims 1-4 4
Optical spectrum detecting method characterized by comprising
Sample is placed in the focal point of focused acquisition optical system (3)；Parallel laser light is collimated by laser (1) transmitting
Beam；
The laser beam received is reflected into focused acquisition optical system (3) by optical path switching device (2), the focused acquisition light
The laser beam that the optical path switching device (2) reflects is gathered in the focal point for being placed with sample by system (3), and transmit from
The back scattered light beam of sample, this light beam include that the kernel offset Raman scattering light beam of central vision and non-central visual field have sky
Between offset spatial offset Raman scattering light beam；
The input terminal that the light beam received is carried out convergence imaging and be coupled to fiber optic bundle (5) by the coupling optical system (4), will
Light beam at different visual fields converges to the different location of the input terminal of fiber optic bundle (5) respectively, specifically enables in central optical fiber correspondence
Heart visual field enables outer ring fiber optic bundle correspond to non-central visual field to which coupled room is inclined to couple kernel offset Raman scattering light beam
Move Raman scattering light beam；
Spectral signal is acquired by spectrometer (6)；If current spatial offset does not meet acquisition when requiring, according to following manner
The size of adjustment space offset is acquired with the Raman spectrum for realizing different spaces displacement:
The focused acquisition optical system (3) is varifocal optical system and the coupling optical system (4) is fixed-focus optical system
When system, the focal length for adjusting the focused acquisition optical system (3) is acquired again；
The focused acquisition optical system (3) is fixed-focus optical system and the coupling optical system (4) is Zoom optical system
When system, the focal length for adjusting the coupling optical system (4) is acquired again；
The focused acquisition optical system (3) is varifocal optical system and the coupling optical system (4) is Zoom optical system
When system, the focal length for adjusting the focused acquisition optical system (3) and the coupling optical system (4) is acquired again.
6. using Raman spectroscopic detection method described in claim 5, which is characterized 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 ring radius R0It is determined, meets R=R0* f4/f3, wherein R is the space displacement amount.
7. using Raman spectroscopic detection method described in claim 5, which is characterized in that
When the spectrometer (6) is imaging spectrometer, the number of the spectrometer (6) is 1, and the fiber optic bundle (5) has one
The optical fiber of a output end, the output end of the fiber optic bundle (5) is linearly distributed and couples with the slit of the spectrometer (6),
The other end of the central optical fiber of the input terminal of the fiber optic bundle (5) is located at one end of the output end of the fiber optic bundle (5).
8. using Raman spectroscopic detection method described in claim 5, which is characterized in that
When the spectrometer (6) is non-imaged spectrometer, the number of the spectrometer (6) is 2, and the spectrometer (6) includes
First spectrometer and the second spectrometer, the fiber optic bundle (5) are that there are two output end, the light of the first output end for Y shape optical fiber beam tool
Fibre is linearly distributed and couples with the slit of the first spectrometer, and the quantity of the optical fiber of the first output end is the fiber optic bundle (5)
Input terminal outer ring position optical fiber quantity, the optical fiber of second output terminal it is linearly distributed and with second spectrometer
Slit coupling, the quantity of the optical fiber of second output terminal is the number of the optical fiber of the center of the input terminal of the fiber optic bundle (5)
Amount.
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