CN216132917U - Concentric cavity raman signal collection system - Google Patents
Concentric cavity raman signal collection system Download PDFInfo
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- CN216132917U CN216132917U CN202122088904.2U CN202122088904U CN216132917U CN 216132917 U CN216132917 U CN 216132917U CN 202122088904 U CN202122088904 U CN 202122088904U CN 216132917 U CN216132917 U CN 216132917U
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Abstract
A concentric cavity raman signal collection system comprising: a near concentric lumen; a reflecting concave surface is arranged on one side of the conical reflector facing the nearly concentric cavity, and the reflecting concave surface is of a conical groove structure; one side of the conical lens, which faces the approximate concentric cavity, is provided with a conical head, and the conical head is of a convex conical structure; and one side surface of the plano-convex lens, which faces the conical lens, is a plano-convex lens plane, and the other side surface of the plano-convex lens is of a convex lens structure. The innovative conception of the utility model is as follows: the axicon lens is placed on the side of the nearly concentric cavity, the geometric center of the nearly concentric cavity is made to fall near the focal length of the axicon lens, and then the filter and the plano-convex lens are placed. The cone lens converges and compresses the excited Raman signal to the plano-convex lens. Through the structural design, the utility model has the following beneficial effects: the optical system constructed by the utility model has an independent structure and simple devices, and has high collection efficiency when optical fibers are adopted to collect signals.
Description
Technical Field
The utility model relates to the technical field of Raman spectrum gas analysis, in particular to a Raman spectrum gas pair.
Background
The Raman spectrum technology is used for analyzing and detecting gas components and is applied to the fields of environmental monitoring, gas logging and the like. As a detection technique, the raman spectroscopy technique has a major advantage in that in-situ monitoring and simultaneous measurement of multiple components are possible, and has a disadvantage in that sensitivity is low.
With the development of raman spectroscopy, the following methods have been proposed for improving signal sensitivity: resonance raman spectroscopy, surface enhanced raman spectroscopy, and cavity enhanced raman spectroscopy. Among the three signal sensitivity improvement methods, resonance raman enhancement of a single signal and surface enhanced raman require a complicated pretreatment process, and the cavity enhancement technology is widely applied because of simplicity and easiness in use.
The near-concentric cavity enhanced Raman spectroscopy technology is a reliable detection method in the Raman cavity enhancement technology, and the feasibility and the effectiveness of the near-concentric cavity enhanced Raman spectroscopy technology are exemplified in various fields. Due to the special light mode in the nearly concentric cavity, all light rays in the cavity are on the same plane, the light ray distribution is similar to a hyperbolic curve when the nearly concentric cavity is overlooked, but the light ray distribution is not uniform on the beam waist of the light rays, two asymmetric convergence points exist, the problems of imaging dispersion, large and scattered light spots and the like can occur on an image space focal plane when the traditional convex lens group is adopted for collection just due to the existence of the two convergence points, and most signal light can be lost if the light rays are coupled into an optical fiber. In addition, the focal depth of the convex lens group is small, so that the difficulty of adjusting the light path in practical use is increased.
SUMMERY OF THE UTILITY MODEL
Problem (A)
In summary, how to provide a novel near-concentric-cavity raman signal collection optical path structure for improving the signal collection efficiency becomes a problem to be solved urgently by those skilled in the art.
(II) technical scheme
The utility model provides a concentric cavity Raman signal collection system, which comprises:
the light plane is provided with two convergence points, the part of the light plane between the two convergence points is a converging light plane, an optical axis parallel to the converging light plane passes through the geometric center of the converging light plane, and the optical axis is a virtual straight line;
the conical reflector is arranged on one side of the light converging plane along the axial direction of the optical axis, a reflecting concave surface is arranged on one side of the conical reflector facing the nearly concentric cavity, the reflecting concave surface is of a conical groove structure, and the axis of the reflecting concave surface is coaxial with the optical axis;
the conical lens is arranged on the other side of the light converging plane along the axial direction of the optical axis, a conical head is arranged on one side of the conical lens, facing the approximately concentric cavity, the conical head is of a convex conical structure, the axis of the conical head is coaxial with the optical axis, the other side of the conical lens is a conical lens plane, the conical lens plane is of a plane structure, and the conical lens plane is perpendicular to the optical axis;
plano-convex lens follows the axial of optical axis, plano-convex lens set up in plane structure one side of awl lens and with the awl lens interval sets up, plano-convex lens orientation a side of awl lens is the plano-convex lens plane, the plano-convex lens plane is plane structure, plano-convex lens plane with the optical axis is perpendicular, plano-convex lens's another side is convex lens structure, plano-convex lens's convex lens structure's axis is coaxial with the optical axis.
Preferably, in the concentric cavity raman signal collection system provided by the present invention, a filter is disposed between the axicon and the planoconvex lens, a side surface of the filter facing the plane of the axicon is a planar structure parallel to the plane of the axicon, and a side surface of the filter facing the plane of the planoconvex lens is a planar structure parallel to the plane of the planoconvex lens.
Preferably, in the concentric cavity raman signal collection system provided by the present invention, an optical fiber head opposite to the convex lens structure is disposed on one side of the convex lens structure of the plano-convex lens, a head end of the optical fiber head is a plane, and the head end of the optical fiber head is perpendicular to the optical axis; the axis of the optical fiber head is coaxial with the optical axis.
Preferably, in the concentric cavity raman signal collection system provided by the present invention, the cone mirror is an integral structure; the plano-convex lens is of an integrated structure; the filter plate is of an integrated structure.
Preferably, in the concentric cavity raman signal collection system provided by the present invention, the geometric center of the converging light plane coincides with the 1/2 focal depth point of the axicon and the axicon.
Preferably, in the concentric cavity raman signal collection system provided by the present invention, a geometric center of the head end of the optical fiber head coincides with a focal point of the plano-convex lens.
(III) advantageous effects
The utility model provides a concentric cavity Raman signal collection system, which comprises: the light plane is provided with two convergence points, the part of the light plane between the two convergence points is a converging light plane, the geometric center of the over-converging light plane is provided with an optical axis parallel to the converging light plane, and the optical axis is a virtual straight line; the conical reflector is arranged on one side of the light converging plane along the axial direction of the optical axis, a reflecting concave surface is arranged on one side of the conical reflector facing the nearly concentric cavity, the reflecting concave surface is of a conical groove structure, and the axis of the reflecting concave surface is coaxial with the optical axis; the conical lens is arranged on the other side of the light converging plane along the axial direction of the optical axis, a conical head is arranged on one side of the conical lens, which faces to the nearly concentric cavity, the conical head is of a convex conical structure, the axis of the conical head is coaxial with the optical axis, the other side of the conical lens is a conical lens plane, the conical lens plane is of a plane structure, and the conical lens plane is vertical to the optical axis; the plane convex lens is arranged on one side of the plane structure of the conical lens along the axial direction of the optical axis and is arranged at an interval with the conical lens, one side surface of the plane convex lens, facing the conical lens, is a plane convex lens plane, the plane convex lens plane is of a plane structure and is vertical to the optical axis, the other side surface of the plane convex lens is of a convex lens structure, and the axis of the convex lens structure of the plane convex lens is coaxial with the optical axis.
In the utility model, the cone lens is arranged on the side surface of the nearly concentric cavity, the geometric center of the nearly concentric cavity is arranged near the focal length of the cone lens, and then the filter and the plano-convex lens are arranged. The cone lens converges and compresses the excited Raman signal to the plano-convex lens, and the cone lens cone surface is aligned to the near-concentric cavity when the light path is adjusted, and the cone angle and the reflected light in the near-concentric cavity are placed on the same horizontal plane. The innovative conception of the utility model is as follows: the axicon lens is placed on the side of the nearly concentric cavity, the geometric center of the nearly concentric cavity is made to fall near the focal length of the axicon lens, and then the filter and the plano-convex lens are placed. The cone lens converges and compresses the excited Raman signal to the plano-convex lens. Through the structural design, the utility model has the following beneficial effects: the optical system constructed by the utility model has an independent structure and simple devices, and has high collection efficiency when optical fibers are adopted to collect signals.
Drawings
Fig. 1 is a schematic diagram of a concentric cavity raman signal collection system in accordance with an embodiment of the present invention.
In fig. 1, the correspondence between the component names and the reference numbers is:
the device comprises a nearly concentric cavity 1, a cone reflector 2, a cone lens 3, a plano-convex lens 4, a filter 5 and a fiber head 6.
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, fig. 1 is a schematic diagram of a concentric cavity raman signal collection system according to an embodiment of the present invention.
The utility model provides a concentric cavity Raman signal collection system, which comprises the following components:
1. near concentric cavity 1
In the nearly concentric cavity 1, a light plane is formed by light rays (the light rays are continuous laser, and the light rays are reflected for multiple times between two spherical reflectors forming the nearly concentric cavity 1), the light plane has two convergence points, the part of the light plane between the two convergence points is a converging light plane, the geometric center of the over-converging light plane has an optical axis parallel to the converging light plane, the optical axis is a virtual straight line, and the optical axis can be regarded as a virtual straight line perpendicular to the cavity axis of the nearly concentric cavity 1.
The near-concentric cavity 1 adopts a structure similar to that of a near-concentric cavity in the traditional near-concentric cavity enhanced Raman spectroscopy technology. Not only is: the laser beam splitter comprises two spherical reflectors which are oppositely arranged, a nearly concentric cavity 1 is formed by the two spherical reflectors which are oppositely arranged, continuous laser is injected into one side of one spherical reflector, the continuous laser forms a light plane under the reflection action of the two spherical reflectors, different laser reflection modes can be formed by changing the distance and the relative included angle between the two spherical reflectors, and two convergent points are mainly formed on the light plane.
For the convenience of structural description, the portion of the light plane located between the two converging points is a converging light plane, which is a planar figure having a specific shape of a set, so that the converging light plane has a geometric center.
2. Conical reflector 2
Along the axial of optical axis, awl speculum 2 sets up in the one side of assembling the light plane, and one side that awl speculum 2 is close concentric cavity 1 is provided with the reflection concave surface, and the reflection concave surface is toper groove structure, and the axis of reflection concave surface is coaxial with the optical axis.
3. Cone lens 3
Along the axial of optical axis, cone lens 3 sets up in converging planar opposite side, and cone lens 3 is provided with the conical head towards one side of nearly concentric chamber 1, and the conical head is convex toper structure, and the axis of conical head is coaxial with the optical axis, and the opposite side of cone lens 3 is 3 planes of cone lens, and 3 planes of cone lens are planar structure, and 3 planes of cone lens are perpendicular with the optical axis.
4. Plano-convex lens 4
Along the axial of optical axis, plano-convex lens 4 sets up in the planar structure one side of awl lens 3 and sets up with awl lens 3 interval, and a side of plano-convex lens 4 towards awl lens 3 is the plano-convex lens 4 plane, and the plano-convex lens 4 plane is planar structure, and the plano-convex lens 4 plane is perpendicular with the optical axis, and another side of plano-convex lens 4 is convex lens structure, and the axis of the convex lens structure of plano-convex lens 4 is coaxial with the optical axis.
5. Filter 5
Filter 5 sets up between awl lens 3 and planoconvex lens 4, and filter 5 is towards 3 planar sides of awl lens for the planar structure parallel with awl lens 3, and filter 5 is towards 4 planar sides of planoconvex lens for the planar structure parallel with planoconvex lens 4.
6. Optical fiber head 6
An optical fiber head 6 opposite to the convex lens structure is arranged on one side of the convex lens structure of the plano-convex lens 4, the head end of the optical fiber head 6 is a plane, the head end of the optical fiber head 6 is perpendicular to the optical axis, and the axis of the optical fiber head 6 is coaxial with the optical axis.
In the utility model, optical elements such as the reflector, the lens and the like are all in regular shapes, the conical reflector 2 is of an integrated structure, the plano-convex lens 4 is of an integrated structure, and the filter 5 is of an integrated structure.
Further, the geometric center of the plane of the condensed light coincides with the 1/2 focal depth point of the axicon 2 and axicon 3.
Further, the geometric center of the head end of the fiber tip 6 coincides with the focal point of the plano-convex lens 4.
The utility model discloses an optical path structure for improving nearly concentric chamber 1 raman signal acquisition efficiency, this optics collecting system includes: the optical fiber comprises a cone lens 3, a planoconvex lens 4, a filter 5, a cone reflector 2 and a circular optical fiber. The method comprises the following steps: the cone lens 3 and the cone reflector 2 are symmetrically arranged at two sides of the nearly concentric cavity 1, the geometric center of the nearly concentric cavity 1 is located near the 1/2 focal depth of the cone lens 3 and the cone reflector 2, the filter 5 and the planoconvex lens 4 are arranged behind the cone lens 3, and the optical fiber bundle is arranged on the focal point of the planoconvex lens 4. The cone lens 3 collects and collimates the stimulated Raman signal, compresses the Raman signal to the plano-convex lens 4, filters out Rayleigh scattering through the filter, couples the optical signal to the optical fiber through the plano-convex lens, and the cone reflector 2 is used for the light on the side surface of the reflection cavity to achieve the double signal enhancement effect. The optical fiber laser is characterized in that the cone lens 3 has large focal depth, can bring the beam waist of the nearly concentric cavity 1 into a signal acquisition range, can collect more signals, is easy to adjust due to large focal depth range and high tolerance to adjustment errors, is more concentrated in luminous flux due to the fact that an optical structure system of the cone lens 3 does not have spherical aberration, is more beneficial to subsequent optical fiber collection, and improves detection efficiency to a certain extent.
The utility model provides a concentric cavity Raman signal collection system, which is an optical path structure capable of improving the Raman signal collection efficiency of a near concentric cavity 1, and the structure design shows that the system comprises the near concentric cavity 1, wherein the near concentric cavity 1 consists of two spherical reflectors, and laser is emitted from one side of one spherical reflector to form an optical plane. The concentric cavity Raman signal collection system provided by the utility model further comprises: the optical fiber cone reflector comprises a cone lens 3, a filter 5, a planoconvex lens 4, a circular optical fiber (an optical fiber head 6) and a cone reflector 2. The Raman signal light passes through the conical lens 3 and the plano-convex lens 4 in sequence and is received by the optical fiber. In the utility model, the conical surface of the cone lens 3 is aligned to the nearly concentric cavity 1, the conical angle and the reflected light in the nearly concentric cavity 1 are placed on the same horizontal plane, wherein the distance between the cone lens 3 and the nearly concentric cavity 1 is half of the focal depth of the cone lens 3. Further, the axicon mirror 2 is placed on the opposite side of the axicon lens 3.
The utility model aims to improve the structure of a traditional receiving light path, thereby providing a signal collection optical structure with higher efficiency and simpler structure. The utility model adopts the cone lens 3 to replace the plano-convex lens 4 in the traditional device, and the geometric center of the nearly concentric cavity 1 is enabled to fall on the 1/2 focal depth position of the cone lens 3 through the structural design. The transverse resolution of the system is sacrificed by the light path of the cone lens 3, but a larger focal depth range collected by the system is obtained, and based on the structure provided by the utility model, the cone lens 3 can be moved in a certain range without influencing the signal intensity
The utility model forms two asymmetrical laser gathering points in the center of the cavity by multiple reflection caused by two broadband medium reflectors (spherical reflectors), compresses the laser in space, amplifies the interaction of the laser and the substance at the focusing points, and enhances the Raman signal. Two laser focusing points with different depth and left and right positions are formed in the center of the cavity when viewed from the side of the cavity. The plano-convex cone lens 3 adopted by the utility model is provided with a conical surface and a plane, when parallel light enters from the plane, the parallel light can generate non-diffraction light beams with consistent annular thickness similar to Bessel light beams, according to the reversible principle of a light path, the conical surface is aligned to the near concentric cavity 1, when a cone angle and reflected light rays in the near concentric cavity 1 are placed on the same horizontal plane, light signals in a rhombus cube in the center X direction of the near concentric cavity 1 are changed into parallel light through the cone lens 3.
In one embodiment of the utility model, the utility model places the axicon 3 on the side of the nearly concentric cavity 1, with the geometric center of the nearly concentric cavity 1 being near the focal length of the axicon 3, followed by placement of the filter and plano-convex lens. The conical lens 3 converges and compresses the excited Raman signal to the plano-convex lens, and when the light path is adjusted, the conical surface of the conical lens 3 is aligned to the nearly concentric cavity 1, and the cone angle and the reflected light in the nearly concentric cavity 1 are placed on the same horizontal plane. The innovative conception of the utility model is as follows: the axicon 3 is placed on the side of the nearly concentric cavity 1 with the geometric center of the nearly concentric cavity 1 in the vicinity of the focal length of the axicon 3, followed by the placement of the filter and plano-convex lens. The cone lens 3 converges and compresses the excited Raman signal to the plano-convex lens. Through the structural design, the utility model has the following beneficial effects: the optical system constructed by the utility model has an independent structure and simple devices, and has high collection efficiency when optical fibers are adopted to collect signals.
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 (6)
1. A concentric cavity raman signal collection system, comprising:
the light source comprises a near concentric cavity (1), wherein a light plane is formed by light rays in the near concentric cavity, the light plane is provided with two convergence points, the part of the light plane between the two convergence points is a converging light plane, an optical axis parallel to the converging light plane is arranged through the geometric center of the converging light plane, and the optical axis is a virtual straight line;
the conical reflector (2) is arranged on one side of the light converging plane along the axial direction of the optical axis, a reflecting concave surface is arranged on one side of the conical reflector facing the nearly concentric cavity, the reflecting concave surface is of a conical groove structure, and the axis of the reflecting concave surface is coaxial with the optical axis;
the conical lens (3) is arranged on the other side of the light converging plane along the axial direction of the optical axis, a conical head is arranged on one side of the conical lens, facing the nearly concentric cavity, the conical head is of a convex conical structure, the axis of the conical head is coaxial with the optical axis, the other side of the conical lens is a conical lens plane, the conical lens plane is of a plane structure, and the conical lens plane is perpendicular to the optical axis;
plano-convex lens (4), follow the axial of optical axis, plano-convex lens set up in plane structure one side of awl lens and with the awl lens interval sets up, plano-convex lens orientation a side of awl lens is the plano-convex lens plane, the plano-convex lens plane is planar structure, plano-convex lens plane with the optical axis is perpendicular, plano-convex lens's another side is convex lens structure, plano-convex lens's convex lens structure's axis is coaxial with the optical axis.
2. The concentric cavity Raman signal collection system of claim 1,
in conical lens with be provided with filter (5) between the planoconvex lens, the filter orientation conical lens planar side be for with the planar structure of conical lens plane parallel, the filter orientation planoconvex lens planar side be with the planar structure of planoconvex lens plane parallel.
3. The concentric cavity Raman signal collection system of claim 2,
an optical fiber head (6) opposite to the convex lens structure is arranged on one side of the convex lens structure of the plano-convex lens, the head end of the optical fiber head is a plane, and the head end of the optical fiber head is perpendicular to the optical axis;
the axis of the optical fiber head is coaxial with the optical axis.
4. The concentric cavity Raman signal collection system of claim 3,
the conical reflector is of an integrated structure;
the plano-convex lens is of an integrated structure;
the filter plate is of an integrated structure.
5. The concentric cavity Raman signal collection system of claim 1,
the geometric center of the converging light plane coincides with the 1/2 depth of focus point of the axicon and the axicon.
6. The concentric cavity Raman signal collection system of claim 3,
the geometric center of the head end of the optical fiber head is coincided with the focus of the plano-convex lens.
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| CN202122088904.2U CN216132917U (en) | 2021-09-01 | 2021-09-01 | Concentric cavity raman signal collection system |
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| CN202122088904.2U CN216132917U (en) | 2021-09-01 | 2021-09-01 | Concentric cavity raman signal collection system |
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