CN216309798U - Near-concentric cavity Raman system with high collection efficiency - Google Patents
Near-concentric cavity Raman system with high collection efficiency Download PDFInfo
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- CN216309798U CN216309798U CN202122092506.8U CN202122092506U CN216309798U CN 216309798 U CN216309798 U CN 216309798U CN 202122092506 U CN202122092506 U CN 202122092506U CN 216309798 U CN216309798 U CN 216309798U
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Abstract
A high collection efficiency near-concentric cavity raman system comprising: a near concentric lumen; a lens group; the optical fiber bundle, the one end of optical fiber bundle is signal receiving terminal, the other end of optical fiber bundle is signal output terminal, the optical fiber bundle is including many core fiber, at signal receiving terminal, whole core fiber divide into at least two sets ofly, and the core fiber quantity difference in each group is not more than 1, at signal receiving terminal, the core fiber of same group is arranged the setting in proper order along the straight line on horizontal, at signal receiving terminal, each group core fiber is arranged the setting in proper order on vertical, at signal output terminal, all core fiber are arranged the setting in proper order along the straight line on horizontal. For the near-concentric cavity linear raman system, compared with the conventional circular arrangement optical fiber mode, the linear arrangement optical fiber mode improves the signal intensity by about two times, that is, the collection efficiency of the detection optical signals is greatly increased. The arrangement mode of the upper core optical fibers on the end face of the optical fiber bundle can effectively improve the collection efficiency of the Raman signals of the near-concentric-cavity linear gas Raman system.
Description
Technical Field
The utility model relates to the technical field of Raman spectrum gas analysis, in particular to a near-concentric cavity Raman system with high collection efficiency.
Background
Raman spectrum analysis can carry out nondestructive qualitative and quantitative detection on the sample and can simultaneously detect the composition of multi-component substances. Because raman spectroscopy has the characteristics of rapid detection, simple operation, and repeatable detection, it has been widely used in recent years for the study of the composition analysis of biological samples and chemical compounds.
Compared with gas chromatography and infrared spectroscopy, the low detection sensitivity of the raman spectroscopy is a limitation of raman spectroscopy, and particularly in the aspect of gas detection, the scattering cross section is reduced due to large gas intermolecular spacing and small density, and the intensity of raman scattering generated when light interacts with substances is smaller. Although the raman spectroscopy technique has the above problems, the raman spectroscopy technique is still an irreplaceable technique as a rapid and convenient spectroscopic detection and analysis technique. Therefore, the improvement of the detection sensitivity of the raman spectroscopy technology also becomes a problem that needs to be solved in the development of the raman spectroscopy technology.
With the development of the spectroscopic technology, technicians have also proposed various methods for improving the sensitivity of raman spectroscopy, wherein the following three methods are mainly used for improving the detection sensitivity of the raman spectroscopy: resonance Raman spectroscopy, surface enhanced Raman spectroscopy, and cavity enhanced Raman spectroscopy. Compared with the three enhancement methods of the Raman spectrum, the cavity enhanced Raman scattering does not need sample pretreatment, and multiple components can be simultaneously detected, so that the method for enhancing the sensitivity of the Raman spectrum by selecting the cavity enhancement method becomes the mainstream sensitivity enhancement method.
In raman spectroscopy, the multiple reflection cavity has two roles: first, the effective length is increased. By making the cavity nearly concentric, the light is reflected back and forth in the cavity to increase the transmission distance of the light in the sample, thereby increasing the absorption of the light by the substance, and thus improving the sensitivity. Second, increasing the light intensity. For the scattering spectrum, the laser is mainly reflected multiple times in the cavity and focused at a certain point or a certain area, so that the light intensity of the area is greatly increased, and the scattering intensity is improved. Raman spectroscopy is a scattering spectrum and therefore a near concentric cavity can be used to improve sensitivity.
The principle of the nearly concentric cavity is that the intensity of the exciting light near the center of the cavity is increased by focusing the laser beam near the center of the cavity for multiple times, so that the generated Raman signals are superposed, and the signal intensity is improved. Therefore, the main purpose of using the nearly concentric cavity is to collect a plurality of light rays near the center of the cavity, and when the number of the collected light rays is more, the size of the formed light spot is smaller and the reflection loss of the light on the mirror surface is smaller, the enhancement effect of the cavity is more obvious, and the effect of improving the signal intensity is more obvious.
Based on the above analysis, in the nearly concentric cavity, by adjusting the distance between the two mirrors (the two mirrors forming the nearly concentric cavity) and the positions of the curvature centers of the two mirrors, a plurality of multiple reflection modes can be formed in the cavity, wherein the representative modes are an elliptical mode and a linear mode, the elliptical mode means that the light spots formed on each mirror surface are arranged in an elliptical mode, and the linear mode means that the light spots are arranged in a linear mode. The signal intensity of the nearly concentric cavity linear system is strongest, and the background influence in the lateral collection system is weaker, so the lateral collection nearly concentric cavity linear system is adopted.
In addition, the most important part of the gas raman spectroscopy system is the detection and reception of signals, and the method for enhancing raman signals mainly has two ideas: firstly, the signal is enhanced, and secondly, the signal collection efficiency of the receiving device is improved. The cavity enhancement technology is mostly adopted for enhancing signals, the optical fiber receiving is mostly adopted for receiving ends of a receiving device, the arrangement mode of the optical fiber end faces is one of main factors influencing the optical fiber receiving efficiency, the traditional arrangement mode of the optical fiber end faces is circular, and because the received signal light faculae are similar to Airy spots (the Airy spots are faculae formed at a focus due to diffraction when a point light source images through a diffraction limited lens, the center of the Airy spots is a bright circular spot, a group of weak concentric annular stripes with alternate light and shade are arranged around the central bright spot, and the central bright spot taking a first dark ring as a boundary is called the Airy spot), the receiving efficiency is highest when the optical fiber end faces are arranged in a circular mode. However, for the side-collected nearly concentric cavity linear raman system, the laser beam in the cavity is on the same horizontal plane as the side of the cavity, i.e. the signal collection position, and the collected raman signal is the scattered light of the beam, which is also linear, so that the side-collected signal light is linear, and the circular arrangement of the end faces of the optical fibers is not suitable.
For the optical fiber at the receiving end, the main indexes include: the diameter of the fiber core of the optical fiber, the number of core optical fibers in the optical fiber bundle, the numerical aperture of the optical fiber, the length of the optical fiber, the arrangement mode of the end face of the optical fiber and the like. When a signal is coupled into an optical fiber, the larger the core diameter of the optical fiber, the easier the signal light is coupled into the optical fiber, and the higher the coupling efficiency. The conventional optical fiber bundle is a 19-core optical fiber, which is arranged in a circle at the signal receiving end and in a single-row line at the signal output end.
SUMMERY OF THE UTILITY MODEL
Problem (A)
In summary, the conventional raman spectroscopy has the following technical problems: the conventional optical fiber bundle is a 19-core optical fiber, the core optical fibers are arranged into a circle at a signal receiving end and are arranged into a single-row line at a signal output end, and for a laterally collected near-concentric cavity linear gas Raman system, the collection efficiency of the optical fiber bundle in the conventional circular arrangement mode on Raman signals is lower.
(II) technical scheme
The utility model provides a high-collection-efficiency near-concentric-cavity Raman system, which comprises:
the near concentric cavity comprises two near concentric cavity reflectors which are oppositely arranged, and the two near concentric cavity reflectors reflect continuous laser for multiple times to form a detection light plane;
one end of the lens group is an incident end, the incident end is arranged towards the detection light plane, and the other end of the lens group is an emergent end;
the optical fiber bundle comprises a signal receiving end and a signal output end, wherein one end of the optical fiber bundle is a signal receiving end, the other end of the optical fiber bundle is a signal output end, the optical fiber bundle comprises a plurality of core optical fibers, all the core optical fibers at the signal receiving end are divided into at least two groups, the number difference of the core optical fibers in each group is not more than 1, the core optical fibers at the signal receiving end and the same group are sequentially arranged along a straight line in the transverse direction, the core optical fibers at the signal receiving end and the core optical fibers in each group are sequentially arranged in the vertical direction, and the core optical fibers at the signal output end and all the core optical fibers are sequentially arranged along a straight line in the transverse direction.
Preferably, in the high collection efficiency near-concentric cavity raman system provided by the present invention, the fiber bundle is a 19-core fiber.
Preferably, in the high collection efficiency near-concentric cavity raman system provided by the present invention, at the signal receiving end, the core fibers include two groups, one group includes 9 core fibers and forms an upper row of fibers, and the other group includes 10 core fibers and forms a lower row of fibers; the upper row of optical fibers is arranged on the upper side of the lower row of optical fibers; the core fibers included in the upper row of optical fibers are disposed between two adjacent core fibers in the lower row of optical fibers.
Preferably, in the high collection efficiency nearly concentric cavity raman system provided by the present invention, the upper row of optical fibers and the lower row of optical fibers form a trapezoidal profile structure.
Preferably, in the high collection efficiency near-concentric cavity raman system provided by the present invention, the fiber bundle is fixed on the exit end of the lens group through a fiber flange.
Preferably, in the high-collection-efficiency near-concentric-cavity raman system provided by the present invention, a centroid connecting line of the two near-concentric-cavity mirrors is a concentric cavity axis; the centroid connecting lines of all the lenses of the lens group are the axes of the lens group; the lens set axis and the concentric cavity axis are arranged in a coplanar mode, and an included angle of 25-35 degrees is formed between the lens set axis and the concentric cavity axis.
Preferably, in the high collection efficiency near-concentric cavity raman system provided by the present invention, a signal output end of the optical fiber bundle is connected to a spectrometer through an optical fiber flange, and the spectrometer is connected to a computer.
(III) advantageous effects
In the present invention, the present invention provides a high collection efficiency near-concentric cavity raman system, including: the near concentric cavity comprises two near concentric cavity reflectors which are oppositely arranged, and the two near concentric cavity reflectors reflect continuous laser for multiple times to form a detection light plane; one end of the lens group is an incident end, the incident end is arranged towards the detection light plane, and the other end of the lens group is an emergent end; the optical fiber bundle comprises a signal receiving end and a signal output end, wherein one end of the optical fiber bundle is a signal receiving end, the other end of the optical fiber bundle is a signal output end, the optical fiber bundle comprises a plurality of core optical fibers, all the core optical fibers at the signal receiving end are divided into at least two groups, the number difference of the core optical fibers in each group is not more than 1, the core optical fibers at the signal receiving end and the same group are sequentially arranged along a straight line in the transverse direction, the core optical fibers at the signal receiving end and the core optical fibers in each group are sequentially arranged in the vertical direction, and the core optical fibers at the signal output end and all the core optical fibers are sequentially arranged along a straight line in the transverse direction.
Through the structural design, the utility model has the beneficial effects that: through comparison, for a near-concentric cavity linear Raman system, compared with a traditional circular arrangement optical fiber mode, the linear arrangement optical fiber mode has the advantage that the signal intensity is approximately improved by two times, namely the collection efficiency of detection optical signals is greatly improved. The arrangement mode of the upper core optical fibers on the end face of the optical fiber bundle can effectively improve the collection efficiency of the Raman signals of the near-concentric-cavity linear gas Raman system.
Drawings
FIG. 1 is a schematic diagram of multiple reflections of continuous laser light by a near-concentric cavity in a high-collection-efficiency near-concentric cavity Raman system according to an embodiment of the present invention;
FIG. 2 is a view of FIG. 1 after changing the viewing angle;
FIG. 3 is a layout diagram of core fibers at a signal receiving end of an optical fiber bundle in a high collection efficiency near-concentric cavity Raman system according to an embodiment of the present invention;
FIG. 4 is a layout diagram of core fibers at the signal output end of an optical fiber bundle in a high collection efficiency near-concentric cavity Raman system according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a high collection efficiency near-concentric cavity raman system in an embodiment of the present invention.
In fig. 1 to 5, the correspondence between the part names and the reference numbers is:
the device comprises a near concentric cavity reflector 1, a lens group 2, a convex lens 21, an optical filter 22, an optical fiber bundle 3, a signal receiving end 31, a signal output end 32, a core optical fiber 4, an optical fiber flange 5, a spectrometer 6 and a computer 7.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the utility model but are not intended to limit the scope of the utility model.
In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the utility model. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1 to 5, fig. 1 is a schematic diagram illustrating multiple reflections of continuous laser from a near-concentric cavity in a high-collection-efficiency near-concentric cavity raman system according to an embodiment of the present invention; FIG. 2 is a view of FIG. 1 after changing the viewing angle; FIG. 3 is a layout diagram of core fibers at a signal receiving end of an optical fiber bundle in a high collection efficiency near-concentric cavity Raman system according to an embodiment of the present invention; FIG. 4 is a layout diagram of core fibers at the signal output end of an optical fiber bundle in a high collection efficiency near-concentric cavity Raman system according to an embodiment of the present invention; fig. 5 is a schematic structural diagram of a high collection efficiency near-concentric cavity raman system in an embodiment of the present invention.
The utility model provides a near-concentric cavity Raman system with high collection efficiency, which is based on the structure of a traditional Raman system, is structurally optimized, and can improve the optical signal collection efficiency of the Raman system after optimization.
Specifically, the near-concentric cavity Raman system with high collection efficiency provided by the utility model comprises the following components:
1. near concentric cavity
The nearly concentric cavity is including two nearly concentric cavity speculum 1 (concave mirror) that set up relatively, and nearly concentric cavity speculum 1 is relative and the interval sets up, and continuous laser is penetrated into from one side of nearly concentric cavity to the laser instrument, and continuous laser is in succession reflected many times between two nearly concentric cavity speculums 1, carries out multiple reflection by two nearly concentric cavity speculums 1 to continuous laser and can form one by detection light plane.
2. Lens group 2
The lens group 2 is composed of a plurality of lenses, and in one embodiment of the present invention, the transparent group includes two convex lenses 21, and an optical filter 22 is disposed between the two convex lenses 21. The centroids of the convex lens 21 and the filter 22 constituting the lens group 2 are located on the same straight line (virtual straight line), and are set for convenience of structural description: the centroid connecting line (i.e., the straight line described above, which is a virtual straight line) of all the lenses and the filters of the lens group 2 is the lens group axis.
Along the extending direction of the lens set axis, one end of the lens set 2 is an incident end, the incident end is arranged towards the detection light plane, and the other end of the lens set 2 is an emergent end.
3. Optical fiber bundle 3
The optical fiber bundle 3 is used for transmitting detection optical signals, the detection signal light is emitted from the emergent end after passing through the lens group 2 from the incident end, the optical fiber bundle 3 is in butt joint with the emergent end of the lens group 2, the detection optical signals can be transmitted to the spectrometer 6 through the optical fiber bundle 3, the spectrometer 6 analyzes the detection optical signals, and the computer 7 displays results.
The improvement of the utility model focuses on the structural improvement of the optical fiber bundle 3, and particularly, the arrangement mode of core optical fibers 4 at two ends of the optical fiber bundle 3 is improved.
Specifically, one end of the optical fiber bundle 3 is a signal receiving end 31, and the other end of the optical fiber bundle 3 is a signal output end 32. The optical fiber bundle 3 includes a plurality of core optical fibers 4, at the signal receiving end 31, all the core optical fibers 4 are divided into at least two groups, and the number difference of the core optical fibers 4 in each group is not more than 1 (when the optical fiber bundle 3 is composed of an odd number of core optical fibers 4, the number difference of the core optical fibers 4 in each group is 1 or 0, and when the optical fiber bundle 3 is composed of an even number of core optical fibers 4, the number difference of the core optical fibers 4 in each group is 0). The core optical fibers 4 of the same group are arranged in sequence along a straight line in the transverse direction at the signal receiving end 31, the core optical fibers 4 of each group are arranged in sequence in the vertical direction at the signal receiving end 31, and the core optical fibers 4 of all the groups are arranged in sequence along a straight line in the transverse direction at the signal output end 32.
Specifically, the optical fiber bundle 3 used in the present invention is a 19-core optical fiber (an odd number of core optical fibers 4). And at the signal receiving end 31, the core fibers 4 are arranged in two groups, one group including 9 core fibers 4 and forming an upper row of fibers, and the other group including 10 core fibers 4 and forming a lower row of fibers. The upper row of optical fibers is arranged on the upper side of the lower row of optical fibers, and the core optical fibers 4 contained in the upper row of optical fibers are arranged between two adjacent core optical fibers 4 in the lower row of optical fibers. Based on the structural design, the upper row of optical fibers and the lower row of optical fibers form a trapezoidal outline structure.
Further, the optical fiber bundle 3 is fixed on the exit end of the lens group 2 by an optical fiber flange 5.
Specifically, the centroid connecting line of the two nearly concentric cavity reflectors 1 is a concentric cavity axis, the lens group axis and the concentric cavity axis are arranged in a coplanar manner, and an included angle of 25 ° to 35 ° is formed between the lens group axis and the concentric cavity axis, wherein the included angle between the lens group axis and the concentric cavity axis may be 25 °, 27 °, 30 °, 32 ° or 35 °, and 30 ° is an optimal included angle.
Specifically, the signal output end 32 of the optical fiber bundle 3 is connected with a spectrometer 6 through an optical fiber flange 5, and the spectrometer 6 is connected with a computer 7.
In the present invention, the optical fiber bundle 3 is a 19-core optical fiber, the end face arrangement of the signal receiving end 31 of the optical fiber bundle 3 is double rows (which means the arrangement of the core optical fibers 4), the upper row of the double rows is 9 core optical fibers 4, the lower row of the double rows is 10 core optical fibers 4, the upper row of the double rows is disposed on the upper side of the lower row of the double rows, the core optical fibers 4 included in the upper row of the double rows are disposed between two adjacent core optical fibers 4 in the lower row of the double rows, and the upper row of the double rows and the lower row of the double rows form a trapezoidal profile structure. The end faces (signal output ends 32) of the fiber bundle 3 introduced into the spectrometer 6 are arranged in a single row, and all 19 core fibers 4 are arranged in a straight line in the horizontal direction. The two ends of the optical fiber bundle 3 are cylinders, and the optical fiber bundle 3 is fixed on the rear side of the lens group 2 through an optical fiber flange 5. According to the utility model, by changing the arrangement mode (changing into double rows) of the core fibers 4 on the end face of the signal receiving end 31 of the optical fiber bundle 3, the length in the cavity direction (vertical to the axis of the concentric cavity) is increased by adopting the double-row optical fiber end face arrangement mode, the signal collection efficiency in the cavity direction is increased, and the collection efficiency when the near-concentric cavity linear Raman system is laterally collected with Raman signals is increased. The optical fiber flange 5 is placed behind the lens group 2, and an included angle of 30 degrees is formed between the lens group 2 and the optical fiber flange 5 and the axis of the concentric cavity of the approximate concentric cavity reflector 1. The other end of the fiber bundle 3 is connected to a spectrometer 6, and the detection light signal can be guided into the spectrometer 6 and then displayed by a computer 7. In the utility model, in the signal receiving terminal 31, the arrangement mode of the core optical fibers 4 is double rows, and the collection efficiency of the Raman signals can be greatly improved by utilizing the double-row linear end surface arrangement mode.
Through the structural design, the utility model has the beneficial effects that: through comparison, for a near-concentric cavity linear Raman system, compared with a traditional circular arrangement optical fiber mode, the linear arrangement optical fiber mode has the advantage that the signal intensity is approximately improved by two times, namely the collection efficiency of detection optical signals is greatly improved. The arrangement mode of the upper core optical fibers on the end face of the optical fiber bundle can effectively improve the collection efficiency of the Raman signals of the near-concentric-cavity linear gas Raman system.
The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the utility model in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to best explain the principles of the utility model and the practical application, and to enable others of ordinary skill in the art to understand the utility model for various embodiments with various modifications as are suited to the particular use contemplated.
Claims (7)
1. A high collection efficiency near-concentric cavity raman system, comprising:
the optical detection device comprises a near concentric cavity, a laser light source and a laser light source, wherein the near concentric cavity comprises two near concentric cavity reflectors (1) which are oppositely arranged, and the two near concentric cavity reflectors reflect continuous laser light for multiple times to form a detection optical plane;
a lens group (2), one end of which is an incident end, the incident end is arranged towards the detection light plane, and the other end of which is an emergent end;
the optical fiber bundle comprises an optical fiber bundle (3), wherein one end of the optical fiber bundle is a signal receiving end (31), the other end of the optical fiber bundle is a signal output end (32), the optical fiber bundle comprises a plurality of core optical fibers (4), all the core optical fibers at the signal receiving end are divided into at least two groups, the number difference of the core optical fibers in each group is not more than 1, the core optical fibers at the signal receiving end and the same group are sequentially arranged along a straight line in the transverse direction, the core optical fibers at the signal receiving end and all the groups are sequentially arranged in the vertical direction, and the core optical fibers at the signal output end and all the core optical fibers are sequentially arranged along a straight line in the transverse direction.
2. The high collection efficiency nearly concentric cavity Raman system of claim 1,
the optical fiber bundle is a 19-core optical fiber.
3. The high collection efficiency nearly concentric cavity Raman system of claim 2,
at the signal receiving end, the core optical fibers comprise two groups, wherein one group comprises 9 core optical fibers and forms an upper row of optical fibers, and the other group comprises 10 core optical fibers and forms a lower row of optical fibers;
the upper row of optical fibers is arranged on the upper side of the lower row of optical fibers;
the core fibers included in the upper row of optical fibers are disposed between two adjacent core fibers in the lower row of optical fibers.
4. The high collection efficiency nearly concentric cavity Raman system of claim 3,
the upper row of optical fibers and the lower row of optical fibers form a trapezoidal outline structure.
5. The high collection efficiency nearly concentric cavity Raman system of claim 1,
the optical fiber bundle is fixed on the emergent end of the lens group through an optical fiber flange (5).
6. The high collection efficiency nearly concentric cavity Raman system of claim 1,
the centroid connecting line of the two near concentric cavity reflectors is a concentric cavity axis;
the centroid connecting lines of all the lenses of the lens group are the axes of the lens group;
the lens set axis and the concentric cavity axis are arranged in a coplanar mode, and an included angle of 25-35 degrees is formed between the lens set axis and the concentric cavity axis.
7. The high collection efficiency nearly concentric cavity Raman system of claim 1,
the signal output end of the optical fiber bundle is connected with a spectrometer (6) through an optical fiber flange, and the spectrometer is connected with a computer (7).
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