CN117007572A - Space offset Raman spectrum detection system - Google Patents
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- 238000001237 Raman spectrum Methods 0.000 title claims abstract description 43
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- 238000001069 Raman spectroscopy Methods 0.000 claims description 54
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- 238000004458 analytical method Methods 0.000 claims description 5
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- 238000004793 spatially offset Raman spectroscopy Methods 0.000 claims description 4
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- 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
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Abstract
The application discloses a space shift Raman spectrum detection system, which comprises: the device comprises a space offset Raman spectrum light path device, a collection optical fiber bundle and a spectrometer, wherein the collection optical beam comprises a circular input end and a linear output end, the collection optical fiber bundle comprises a plurality of collection areas, a first ring corresponding to a central area of the circular input end, and two concentric rings surrounding the first ring, a second ring and a third ring, the collection optical fiber at the first ring is an origin of an excitation position, and the corresponding space offset is zero; the optical fiber arrangement of the circular input end follows the central symmetry principle, the first ring of the collecting area at the central position is taken as the zero level of offset, and the diameter of the annular collecting area of each increasing level is increased from the annular collecting area of the first level. Effectively overcomes various defects in the prior art and has high industrial utilization value.
Description
Technical Field
The present application relates to the field of raman detection technology, and more particularly, to a spatially offset raman spectrum detection system.
Background
Raman scattering is a non-elastic scattering effect based on vibration of molecules or lattices within the object under investigation, which was found by indian scientist c.v. raman in 1928 and thus is termed "raman scattering effect" and its spectrum is called "raman spectrum". The Raman spectrum technology has the advantages of strong repeatability, simple sample preparation, small moisture interference, nondestructive detection, short detection time, small sample consumption, high sensitivity and the like, has great value for purely qualitative analysis, high-precision quantitative analysis and molecular structure determination, and has application range in various fields of chemistry, physics, biology, materials, medicine, cultural relics, precious stones and the like.
In the optical structure of the system, the laser incidence focus of the spectrometer and the focus of the spectrum collection system are spatially offset by a certain distance on the surface layer of the sample, so that the spectrum is called as a 'spatially offset Raman spectrum'. The space shift Raman spectrum technology is a novel spectrum measurement technology which appears in recent years and is a derivative technology of Raman spectrum, so that the spectrum technology has a plurality of unique advantages besides the inherent advantages of the traditional Raman spectrum: (1) Due to offset measurement, the surface signal interference can be effectively inhibited by combining spectrum scattering, and the detection depth is improved; (2) In a certain range, the larger the offset distance is, the larger the signal of a deeper sample in the collected Raman signals is, the deeper the penetration depth is, and the deep detection can be realized; (3) The nondestructive on-line detection can be realized by detecting the sample in the detection process without damaging the package, so that the detection and production cost of a user are reduced; (4) The remote measurement can be carried out on the target object in the occasion that the danger is severe and the user is not suitable for on-site detection, so that the personal safety of the inspector can be ensured.
Spatially offset raman spectroscopy is a relatively new analytical technique among many spectroscopic analysis methods, and in recent years, researchers have achieved a lot of results through intensive research. Compared with the traditional Raman spectrum technology, the space-shift Raman spectrum technology has the advantages of deep detection, long-distance telemetry, non-invasive nondestructive detection and the like. At the present stage, in the initial stage of the development of the space-shift Raman spectrum, there are many places needing improvement, and the problems of the depth measurement affected by the radius diameter of the laser beam, the convenience of observing light spots and the like are all to be improved.
Disclosure of Invention
According to the application, a space-shift Raman spectrum detection system is provided, so that the technical problems that in the initial stage of space-shift Raman spectrum development at present, the diameter of a laser beam influences the measurement of depth, the convenience of observing light spots and the like are all to be improved are solved.
According to a first aspect of the present application there is provided a spatially offset raman spectrum detection system comprising: a space shift Raman spectrum light path device, a collecting optical fiber bundle and a spectrometer,
the collecting optical beam comprises a circular input end and a linear output end, the collecting optical fiber bundle comprises a plurality of collecting areas, a first ring corresponding to the central area of the circular input end, and two concentric rings, a second ring and a third ring surrounding the first ring, wherein the collecting optical fiber at the first ring is an origin of an excitation position, and the corresponding spatial offset is zero;
the optical fiber arrangement of the circular input end follows the central symmetry principle, the first ring of the collecting area at the central position is taken as the zero level of offset, and the diameter of the annular collecting area of each increasing level is increased from the annular collecting area of the first level.
Optionally, the circular input end is used for receiving the offset raman signal focused by the spatial offset raman spectrum optical path device, and the linear output end is used for converting the circular arrangement of the circular input end into linear arrangement and is coupled with an entrance slit of the spectrometer.
Optionally, the spatially offset raman spectroscopy optical path device is configured to collect a raman signal and focus the raman signal to an input end of a collection fiber optic bundle.
Optionally, the collecting fiber bundle is used for collecting raman signal photons and inputting the raman signal photons to the spectrometer through the linear output end, and the spectrum CCD camera is used for image acquisition and analysis.
Optionally, the spatial offset raman spectrum optical path device comprises a laser, a laser focusing device, a laser transmission optical fiber, a laser collimation system, a first optical path conversion device, a second optical path conversion device, a focusing acquisition optical system and a coupling optical system;
the laser, the laser focusing device, the laser transmission optical fiber and the laser collimation system are used for outputting collimated and parallel laser beams, and the radius of the laser beams generated by the laser is adjustable.
Optionally, the first optical path conversion device is configured to reflect the laser beam and pick up a raman signal.
Optionally, the second optical path conversion device is configured to reflect the laser beam and the raman signal.
Optionally, the focusing and collecting optical system is used for focusing the laser beams reflected by the first optical path conversion device and the second optical path conversion device, collecting raman signal beams and collimating the raman signal beams into parallel beams, wherein the sample is placed at the focal plane position of the focusing and collecting optical system.
Optionally, the white light CCD camera is used for collecting white light images and determining laser irradiation positions.
Optionally, the coupling optical system is configured to focus and couple the raman signal beam collimated by the focusing and collecting optical system to a circular input end of the collection optical fiber bundle, where the circular input end is placed at a focal plane position of the coupling optical system.
Therefore, the radius of the incident laser beam covers the first ring (ring 1) of the circular input end of the collecting optical fiber bundle, the sample is focused and irradiated by the space shift Raman spectrum optical path device, and the depth of the sample is measured at the position, which is farther from the center, of the circular input end of the collecting optical fiber bundle 12, so that the purpose of space shift Raman spectrum measurement is achieved. Meanwhile, the radius of incident laser generated by the laser can be adjusted to cover all round input ends of the collecting optical fiber bundles, the light path device focuses and irradiates the sample, and a Raman scattering effect is generated to generate a Raman signal, so that the purpose of classical Raman spectrum measurement is achieved. Effectively overcomes various defects in the prior art and has high industrial utilization value.
Drawings
Exemplary embodiments of the present application may be more completely understood in consideration of the following drawings:
FIG. 1 is a schematic diagram of a spatially offset Raman spectrum detection system according to the present embodiment;
FIG. 2 is a schematic view of a circular input end fiber array for collecting fiber bundles in an embodiment of the application;
as shown in fig. 1, the laser is 1, the laser collimation system is 2, the coupling optical system is 3, the first optical path conversion device is 4, the second optical path conversion device is 5, the focusing acquisition optical system is 6, the sample is 7, the white light CCD camera is 8, the spectrum CCD camera is 9, the spectrometer is 10, the laser transmission optical fiber is 11, the collecting optical fiber bundle is 12, and the laser focusing device is 13;
as shown in fig. 2, the first ring is 1, the second ring is 2, and the third ring is 3.
Detailed Description
The exemplary embodiments of the present application will now be described with reference to the accompanying drawings, however, the present application may be embodied in many different forms and is not limited to the examples described herein, which are provided to fully and completely disclose the present application and fully convey the scope of the application to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the application. In the drawings, like elements/components are referred to by like reference numerals.
Unless otherwise indicated, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, it will be understood that terms defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
According to a first aspect of the present application there is provided a spatially offset raman spectrum detection system comprising: spatially offset raman spectral optical path means, collection fiber bundle 12 and spectrometer 10,
the collecting light beam 12 comprises a circular input end and a linear output end, the collecting optical fiber bundle 12 comprises a plurality of collecting areas, a first ring corresponding to the central area of the circular input end, and two concentric circles surrounding the first ring, a second ring and a third ring, wherein the collecting optical fiber at the first ring is an origin of an excitation position, and the corresponding space offset is zero;
the optical fiber arrangement of the circular input end follows the central symmetry principle, the first ring of the collecting area at the central position is taken as the zero level of offset, and the diameter of the annular collecting area of each increasing level is increased from the annular collecting area of the first level.
The spatially offset raman spectrum detection system comprises: a spatially offset raman spectral optical path device, a collection fiber bundle 12 and a spectrometer 10;
the spatially offset raman spectroscopy optical path apparatus 10 is configured to collect raman signals and focus the raman signals onto an input end of a collection fiber optic bundle. As shown in fig. 1, the spatial offset raman spectrum optical path apparatus includes: the device comprises a laser 1, a laser collimation system 2, a first light path conversion device 4, a second light path conversion device 5, a focusing acquisition optical system 6 and a coupling optical system 3;
the laser 1 and the laser collimation system 2 are used for outputting collimated and parallel laser beams, and the radius of the laser beam generated by the laser 1 is adjustable;
the optical path conversion device 4 is used for reflecting the laser beam and transmitting a Raman signal;
the optical path conversion device 5 is used for reflecting the laser beam and the Raman signal;
the focusing and collecting optical system 6 is used for focusing the laser beams reflected by the optical path conversion devices 4 and 5, collecting Raman signal beams and collimating the Raman signal beams into parallel beams, wherein a sample 7 is placed at the focal plane position of the focusing and collecting optical system 6;
the white light CCD camera 8 is used for collecting white light images and determining laser irradiation positions;
the coupling optical system 3 is used for focusing and coupling the raman signal beam collimated by the focusing and collecting optical system 6 to a circular input end of the collecting optical fiber bundle 12, and the circular input end is placed at the focal plane position of the coupling optical system 12;
the collection fiber bundle 12 is used for collecting raman signal photons, and is input to the spectrometer 10 through a linear output for image acquisition and analysis.
The collecting light beam 12 comprises a circular input end and a linear output end, the circular input end is used for receiving the offset raman signal after the spatial offset raman spectrum light path device is focused, three collecting areas of the collecting optical fiber bundle correspond to a central area (ring 1) of the circular input end and two concentric circles (rings 2 and 3) surrounding the central area, the collecting optical fiber at the ring 1 is an origin of an excitation position, and the corresponding spatial offset is zero;
the linear output end of the collection optical fiber bundle is used for converting the circular arrangement of the circular input end into linear arrangement and is coupled with the incident slit of the spectrometer.
The optical fiber arrangement of the optical fiber bundle circular input end follows the central symmetry principle, the collecting area (ring 1) at the central position is taken as the offset zero level, and the diameter of the annular collecting area of each increasing level is increased from the annular collecting area of the first level.
In this embodiment, the incident laser is focused and irradiated on the sample from the standard space offset raman spectrum optical path device, and according to the photon migration theory, the further the sample is from the irradiation point, the greater the probability that the acquired raman signal comes from deep tissue, and in the annular region with the same space distance from the irradiation point, the depth information of the sample corresponding to the generated raman signal is basically consistent. The greater the sample depth is measured at the circular input end of the collection fiber bundle 12 at a position further from the center.
The CCD camera is arranged to overcome the problem that the position of the laser beam on the sample and the size of the light spot are difficult to determine;
the radius of the laser beam generated by the laser 1 in the space-shift Raman spectrum optical path device is adjustable, the radius of the incident laser beam covers the first ring (ring 1) of the circular input end of the collecting optical fiber bundle 12, the sample is focused and irradiated by the space-shift Raman spectrum optical path device, and the depth of the sample is measured at the position far from the center of the circular input end of the collecting optical fiber bundle 12, so that the purpose of space-shift Raman spectrum measurement is achieved.
The radius of the incident laser generated by the laser 1 covers the circular input end of all the collecting optical fiber bundles 12, and the light path device focuses and irradiates on a sample to generate a Raman signal by a Raman scattering effect, so that the purpose of classical Raman spectrum measurement is achieved.
Effectively overcomes various defects in the prior art and has high industrial utilization value.
Optionally, the circular input end is configured to receive the offset raman signal focused by the spatially offset raman spectrum optical path device, and the linear output end is configured to convert the circular arrangement of the circular input end into a linear arrangement and couple with the entrance slit of the spectrometer 10.
Optionally, the spatially offset raman spectral optical path means is used to collect raman signals and focus the raman signals to the input end of the collection fiber bundle 12.
Alternatively, the collection fiber bundle 12 is used to collect raman signal photons and input to the spectrometer 10 through a linear output for image acquisition and analysis.
Optionally, the spatial offset raman spectrum optical path device comprises a laser 1, a laser collimation system 2, a first optical path conversion device 4, a second optical path conversion device 5, a focusing acquisition optical system 6 and a coupling optical system 3;
the laser 1 and the laser collimation system 2 are used for outputting collimated and parallel laser beams, and the radius of the laser beam generated by the laser 1 is adjustable.
Optionally, the first optical path conversion device 4 is configured to reflect the laser beam and pick up a raman signal.
Optionally, the second optical path conversion device 5 is configured to reflect the laser beam and the raman signal.
Optionally, the focusing and collecting optical system 6 is configured to focus the laser beam reflected by the first optical path conversion device 4 and the second optical path conversion device 5, and collect the raman signal beam and collimate the raman signal beam into a parallel beam, where the sample 7 is placed at the focal plane position of the focusing and collecting optical system 6.
Alternatively, the white light CCD camera 8 is used to collect white light images and determine the laser irradiation position.
Optionally, the coupling optical system 3 is configured to focus and couple the raman signal beam collimated by the focusing and collecting optical system 6 to a circular input end of the collecting optical fiber bundle 12, which is placed at a focal plane position of the coupling optical system 3.
Therefore, the radius of the incident laser beam covers the first ring (ring 1) of the circular input end of the collecting optical fiber bundle, the sample is focused and irradiated by the space shift Raman spectrum optical path device, and the depth of the sample is measured at the position, which is farther from the center, of the circular input end of the collecting optical fiber bundle 12, so that the purpose of space shift Raman spectrum measurement is achieved. The radius of the incident laser generated by the laser can be adjusted to cover the round input end of all the collecting optical fiber bundles, the light path device focuses and irradiates the sample, and the raman scattering effect is generated to generate raman signals, so that the purpose of classical raman spectrum measurement is achieved. Effectively overcomes various defects in the prior art and has high industrial utilization value.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The scheme in the embodiment of the application can be realized by adopting various computer languages, such as object-oriented programming language Java, an transliteration script language JavaScript and the like.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. A spatially offset raman spectrum detection system, the spatially offset raman spectrum detection system comprising: a spatially offset Raman spectrum optical path device, a collection optical fiber bundle (12) and a spectrometer (10),
the collecting light beam (12) comprises a circular input end and a linear output end, the collecting optical fiber bundle (12) comprises a plurality of collecting areas, a first ring corresponding to the central area of the circular input end, and two concentric circles surrounding the first ring, a second ring and a third ring, wherein the collecting optical fiber at the first ring is the origin of an excitation position, and the corresponding space offset is zero;
the optical fiber arrangement of the circular input end follows the central symmetry principle, the first ring of the collecting area at the central position is taken as the zero level of offset, and the diameter of the annular collecting area of each increasing level is increased from the annular collecting area of the first level.
2. The system of claim 1, wherein the system further comprises a controller configured to control the controller,
the circular input end is used for receiving the offset Raman signal focused by the space offset Raman spectrum optical path device, and the linear output end is used for converting circular arrangement of the circular input end into linear arrangement and is coupled with an incident slit of the spectrometer (10).
3. The system of claim 1, wherein the system further comprises a controller configured to control the controller,
the spatially offset raman spectroscopy optical path device is used for collecting raman signals and focusing the raman signals to the input end of the collection fiber bundle (12).
4. The system of claim 1, wherein the system further comprises a controller configured to control the controller,
the collecting optical fiber bundle (12) is used for collecting Raman signal photons and inputting the Raman signal photons to the spectrometer (10) through the linear output end, and the spectrum CCD camera (9) is used for image acquisition and analysis.
5. The system of claim 3, wherein the system further comprises a controller configured to control the controller,
the space offset Raman spectrum light path device comprises a laser (1), a laser focusing device (13), a laser transmission optical fiber (11), a laser collimation system (2), a first light path conversion device (4), a second light path conversion device (5), a focusing acquisition optical system (6) and a coupling optical system (3);
the laser device comprises a laser (1), a laser focusing device (13), a laser transmission optical fiber (11) and a laser collimation system (2), wherein the laser device is used for outputting collimated and parallel laser beams, and the radius of the laser beam generated by the laser device (1) is adjustable.
6. The system of claim 5, wherein the system further comprises a controller configured to control the controller,
the first optical path conversion device (4) is used for reflecting the laser beam and transmitting the Raman signal.
7. The system of claim 5, wherein the system further comprises a controller configured to control the controller,
the second light path conversion device (5) is used for reflecting the laser beam and the Raman signal.
8. The system of claim 5, wherein the system further comprises a controller configured to control the controller,
the focusing and collecting optical system (6) is used for focusing the laser beams reflected by the first optical path conversion device (4) and the second optical path conversion device (5) and collecting Raman signal beams and collimating the Raman signal beams into parallel beams, wherein a sample (7) is placed at the focal plane position of the focusing and collecting optical system (6).
9. The system of claim 5, wherein the system further comprises a controller configured to control the controller,
the white light CCD camera (8) is used for collecting white light images and determining laser irradiation positions.
10. The system of claim 5, wherein the system further comprises a controller configured to control the controller,
the coupling optical system (3) is used for focusing and coupling the Raman signal beam collimated by the focusing acquisition optical system (6) to a circular input end of the collecting optical fiber bundle (12), and the circular input end is placed at the focal plane position of the coupling optical system (3).
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| CN202310852980.7A CN117007572A (en) | 2023-07-12 | 2023-07-12 | Space offset Raman spectrum detection system |
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| CN202310852980.7A CN117007572A (en) | 2023-07-12 | 2023-07-12 | Space offset Raman spectrum detection system |
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