CN219302261U - Multiplication light path, gas tank and spectrometer - Google Patents
Multiplication light path, gas tank and spectrometer Download PDFInfo
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- CN219302261U CN219302261U CN202122714912.3U CN202122714912U CN219302261U CN 219302261 U CN219302261 U CN 219302261U CN 202122714912 U CN202122714912 U CN 202122714912U CN 219302261 U CN219302261 U CN 219302261U
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Abstract
The utility model discloses a multiplication light path, a gas cell and a spectrometer, wherein the multiplication light path comprises a light beam reflection lens group and a knife-edge prism reflector which is provided with two reflection surfaces and is intersected with the two reflection surfaces, the knife-edge prism reflector is arranged on one side of the light beam reflection lens group, an incident light beam is reflected to the light beam reflection lens group through the knife-edge prism reflector, and is reflected for many times in the light beam reflection lens group and then is reflected to the knife-edge prism reflector, and an outgoing light beam reflected by a return light beam is emitted along the same direction of the incident light beam through the knife-edge prism reflector, so that the light path multiplication can be realized through the light beam reflection lens group, and in addition, the loss of the knife-edge prism reflector to the light beam energy is extremely low.
Description
Technical Field
The utility model belongs to the field of spectrum equipment, and particularly relates to a multiplication light path, a gas tank and a spectrometer.
Background
The optical gas cell is one of important devices for spectrum quantitative analysis, and the optical path of the gas cell is increased, so that the spectrum absorption signal can be enhanced, and the gas detection sensitivity can be improved. The traditional white gas cell structure increases the optical path, the volume of the gas cell can also be increased, the measurement response time is prolonged, and on the other hand, the overall dimension of the gas cell is increased, so that the integration of a gas analyzer is not facilitated.
The patent document CN112683804a discloses a return-type multiplication light path, a gas cell and a spectrometer, in which a concave spherical reflector with the same curvature radius is arranged at the position of the original light outlet of Huai Techi for returning the original emergent light in the traditional white cell, so that the emergent light returns along the original path, and an incident beam and an emergent beam are separated by a beam splitter at the position close to the light inlet and the light outlet, which is suitable for infrared, ultraviolet and laser spectrums. The scheme solves the challenge of separating an incident light beam and an emergent light beam by utilizing the characteristic that the beam splitter can semi-transmit and semi-reflect through the concave spherical return mirror and the beam splitter, and simultaneously solves the challenge of overlapping the incident light spot and the emergent light spot caused by the return of the light beam along the original path. However, the reflection and transmission efficiency of the beam splitter are 50% respectively, and the incident beam and the emergent beam in this scheme are reflected or transmitted once through the beam splitter, so that 75% of the initial incident beam energy loss is additionally caused by the beam splitter, and the beam splitter loses too high beam energy through the transmission or reflection of the incident beam and the emergent beam, which additionally reduces the emergent light intensity of the gas cell and affects the signal-to-noise ratio of the optical system.
Disclosure of Invention
In order to solve the technical problems, the utility model aims to provide a multiplication light path which has multiplied light beam reflection times, multiplied light path, high light path output energy efficiency, simple structure and capability of realizing multiplied light path in a smaller space.
In order to achieve the above object, the technical scheme of the present utility model is as follows: the utility model provides a multiplication light path, includes beam reflection lens group and has two reflecting surfaces and the crossing blade prism speculum of two reflecting surfaces, the blade prism speculum sets up one side of beam reflection lens group, incident light beam warp the blade prism speculum reflection extremely beam reflection lens group, and in the back reflection of beam reflection lens group many times back extremely the blade prism speculum, and by the blade prism speculum is with the outgoing light beam after the return stroke light beam reflection is followed the same direction of incident light beam is penetrated.
The beneficial effects of the technical scheme are that: the light beam reflected by the return beam is reflected by the blade prism reflector, and the outgoing beam reflected by the return beam is emitted by the blade prism reflector, so that the multiplication of the optical path can be realized by the light beam reflector, and the loss of the blade prism reflector to the light beam energy is extremely low.
In the above technical solution, the beam reflection mirror assembly includes a first concave spherical mirror, a second concave spherical mirror, a third concave spherical mirror, and a fourth concave spherical mirror; the first concave spherical reflector and the second concave spherical reflector are arranged at intervals from left to right, the third concave spherical reflector and the fourth concave spherical reflector are arranged at intervals along the left-right direction and are positioned at the rear side of the first concave spherical reflector, the reflecting surfaces of the first concave spherical reflector and the second concave spherical reflector face backwards, the reflecting surfaces of the third concave spherical reflector and the fourth concave spherical reflector face forwards, the third concave spherical reflector is positioned at one side, close to the knife-edge prism reflector, of the fourth concave spherical reflector, the knife-edge prism reflector is arranged at one side, far away from the second concave spherical reflector, of the first concave spherical reflector, incident light beams are shot to the third concave spherical reflector through the knife-edge prism reflector, are reflected between the third concave spherical reflector, the first concave spherical reflector, the fourth concave spherical reflector and the second concave spherical reflector for multiple times, and are reflected back to the knife-edge prism reflector, and are emitted from the knife-edge prism reflector.
The beneficial effects of the technical scheme are that: the optical path energy-saving device is simple in structure, multiplied in reflection times, multiplied in optical path, more in reflection times, long in optical path, high in optical path output energy efficiency and less in number of parts.
In the above technical scheme, the knife edge prism reflector is a knife edge right angle prism reflector.
In the above technical scheme, the first concave spherical reflecting mirror is a convex concave spherical reflecting mirror.
The beneficial effects of the technical scheme are that: therefore, the incident light beam and the light beam reflected by the knife edge prism reflector can be positioned in the same direction, and the occupied space of the light beam reflection lens component is smaller.
The second object of the present utility model is to provide a gas cell which is small in size, has a multiplied number of beam reflections and a multiplied optical path length, and has extremely low beam energy loss.
In order to achieve the above object, the technical scheme of the present utility model is as follows: the utility model provides a gas cell, includes casing and the multiplication light path as above, the casing sets up along the fore-and-aft direction, the casing has incident window and exit window, just incident window and exit window set up relatively the both sides of casing front end, the multiplication light path sets up in the casing, just the blade prism speculum is located between incident window and the exit window, incident light beam is through incident window is penetrated into in the casing and through one reflecting surface reflection of blade prism speculum to beam reflection lens group, and by beam reflection lens group retroflection extremely another reflecting surface of blade prism speculum, and through the exit window is penetrated.
The beneficial effects of the technical scheme are that: the structure is simple, and the incident window and the emergent window are arranged oppositely, so that the blade prism reflector reflects the return beam to the direction same as the incident beam (namely, the emergent beam and the incident beam are emitted in the same direction), and the structure of the gas tank is smaller.
According to the technical scheme, the knife edge prism is arranged between the incident window and the emergent window through the three-way adjusting device, and the three-way adjusting device is used for adjusting the horizontal height of the knife edge prism reflector and the direction of the knife edge side.
The beneficial effects of the technical scheme are that: the orientation of the blade side of the blade prism reflector can be adjusted in this way to adjust the angle at which the incident beam is directed toward the beam reflecting mirror group.
The three bidirectional adjusting devices are respectively arranged corresponding to the second concave spherical reflecting mirror, the third concave spherical reflecting mirror and the fourth concave spherical reflecting mirror are respectively arranged at the rear end of the shell through the corresponding bidirectional adjusting devices, the first concave spherical reflecting mirror is arranged at the front end of the shell and is positioned at the rear of the knife edge prism reflecting mirror, the second concave spherical reflecting mirror is arranged at the other side of the first concave spherical reflecting mirror through the corresponding bidirectional adjusting devices, the third concave spherical reflecting mirror and the knife edge prism reflecting mirror are positioned at the left side or the right side, and the three bidirectional adjusting devices are respectively used for adjusting the directions of the reflecting surfaces of the corresponding second concave spherical reflecting mirror, the third concave spherical reflecting mirror and the fourth concave spherical reflecting mirror.
The beneficial effects of the technical scheme are that: the structure is simple, the number of parts is small, and the space occupied by the beam reflection lens group can be further reduced.
It is a further object of the present utility model to provide a spectrometer comprising a gas cell as described above.
The spectrometer with the technical scheme has the beneficial effects of high sensitivity, less sample amount requirement and high sensitivity.
Drawings
FIG. 1 is a schematic view of a multiplication optical circuit according to embodiment 1 of the present utility model;
FIG. 2 is a schematic view showing the reflection of a light beam when the prism reflector is disposed laterally in embodiment 1 of the present utility model;
fig. 3 is a schematic view showing the reflection of a light beam when the blade prism reflector is vertically arranged in embodiment 1 of the present utility model;
FIG. 4 is a diagram showing one of the spot profiles of the knife edge prism reflector, the first concave spherical reflector, and the second concave spherical reflector according to embodiment 2 of the present utility model;
FIG. 5 is a second distribution diagram of the light spots of the knife edge prism reflector, the first concave spherical reflector and the second concave spherical reflector according to embodiment 2 of the present utility model;
FIG. 6 is a third distribution diagram of the light spots of the knife edge prism reflector, the first concave spherical reflector and the second concave spherical reflector according to embodiment 2 of the present utility model;
FIG. 7 is a schematic view of a gas cell according to example 2 of the present utility model.
FIG. 8 is a schematic view of another embodiment of the gas cell according to example 2 of the present utility model.
In the figure: the device comprises an 11-beam reflecting lens group, a 111 first concave spherical reflecting mirror, a 112 second concave spherical reflecting mirror, a 113 third concave spherical reflecting mirror, a 114 fourth concave spherical reflecting mirror, a 12-blade prism reflecting mirror, a 2 shell, a 21 incident window, a 22 emergent window, a 3-way regulating device and a 4-way regulating device.
Detailed Description
The principles and features of the present utility model are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the utility model and are not to be construed as limiting the scope of the utility model. The utility model is more particularly described by way of example in the following paragraphs with reference to the drawings. Advantages and features of the utility model will become more apparent from the following description and from the claims. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the utility model.
Example 1
As shown in fig. 1-3, the present embodiment provides a multiplication optical path, including a beam reflection mirror group 11 and a blade prism reflection mirror 12 having two reflection surfaces and intersecting with each other, where the blade prism reflection mirror 12 is disposed at one side of the beam reflection mirror group 11, an incident beam is reflected to the beam reflection mirror group 11 by the blade prism reflection mirror 12, and is reflected back to the blade prism reflection mirror 12 after multiple reflections in the beam reflection mirror group 11, and an outgoing beam after reflection of a return beam is emitted by the blade prism reflection mirror 12 along the same direction of the incident beam, so that multiplication of optical path can be achieved by the beam reflection mirror group 11, and in addition, loss of beam energy by the blade prism reflection mirror 12 is low.
The beam reflecting mirror 11 in the above technical solution includes a first concave spherical mirror 111, a second concave spherical mirror 112, a third concave spherical mirror 113 and a fourth concave spherical mirror 114; the first concave spherical mirror 111 and the second concave spherical mirror 112 are arranged at intervals from left to right, the third concave spherical mirror 113 and the fourth concave spherical mirror 114 are arranged at intervals along the left-right direction and are positioned at the rear side of the first concave spherical mirror 111, the reflecting surfaces of the first concave spherical mirror 111 and the second concave spherical mirror 112 face backwards, the reflecting surfaces of the third concave spherical mirror 113 and the fourth concave spherical mirror 114 face forwards, the third concave spherical mirror 113 is positioned at one side of the fourth concave spherical mirror 114 close to the knife edge prism mirror 12, the knife edge prism mirror 12 is arranged at one side of the first concave spherical mirror 111 far away from the second concave spherical mirror 112, incident light beams are emitted to the third concave spherical mirror 113 through the knife edge prism mirror 12, and are reflected back to the knife edge prism mirror 12 through the reflecting mirrors between the third concave spherical mirror 113, the first concave spherical mirror 111, the fourth concave spherical mirror 114 and the second concave spherical mirror 112, and the knife edge prism mirror 12, and the number of the knife edge prism mirror 12 is reduced, and the number of the knife edge prism mirror can be further reduced.
In the above technical solution, the blade prism reflector 12 is a blade right angle prism reflector, so that the incident beam and the outgoing beam reflected by the blade prism reflector can be located in the same direction.
In the above technical solution, the curvature radii of the first concave spherical reflecting mirror 111, the second concave spherical reflecting mirror 112, the third concave spherical reflecting mirror 113 and the fourth concave spherical reflecting mirror 114 are the same, so that the first concave spherical reflecting mirror 111, the second concave spherical reflecting mirror 112, the third concave spherical reflecting mirror 113 and the fourth concave spherical reflecting mirror 114 are more convenient to set.
In the technical scheme, the incident light beam is an ultraviolet light beam, an infrared light beam or a laser light beam, and the multiplication light path has strong adaptability and can be fully applied to light sources with various properties.
The multiplication light path provided in this embodiment separates the incident light beam and the outgoing light beam by using the pair of blade prism reflectors, and the energy loss of the pair of blade prism reflectors to the light beam is extremely small.
Example 2
As shown in fig. 4 to 8, the present embodiment provides a gas cell, which includes a housing 2 and a multiplication light path as described in embodiment 1, wherein the housing 2 is disposed in a front-rear direction, the housing 2 has an incident window 21 and an exit window 22, the incident window 21 and the exit window 22 are disposed on two sides of a front end of the housing 2, the multiplication light path is disposed in the housing 2, and the blade prism reflector 12 is disposed between the incident window 21 and the exit window 22, the incident light beam is incident into the housing 2 through the incident window 21 and reflected to the beam reflector set 11 through the blade prism reflector 12, and is reflected to the blade prism reflector 12 by the beam reflector set 11 and emitted through the exit window 22.
In the above technical solution, the knife-edge prism reflector 12 is mounted between the incident window 21 and the exit window 22 by the three-way adjusting device 3, where the three-way adjusting device 3 is used to adjust the horizontal height of the knife-edge prism reflector 12 and the direction of the knife-edge side, so that the direction of the knife-edge side of the knife-edge prism reflector can be adjusted to adjust the angle of the incident beam towards the beam reflection lens set.
The above technical solution further includes three bi-directional adjusting devices 4, where the three bi-directional adjusting devices 4 are respectively corresponding to the second concave spherical reflecting mirror 112, the third concave spherical reflecting mirror 113 and the fourth concave spherical reflecting mirror 114 are respectively disposed at the rear end of the housing 2 through the corresponding bi-directional adjusting devices 4, the first concave spherical reflecting mirror 111 is disposed at the front end of the housing 2 and is located at the rear of the blade prism reflecting mirror 12, the second concave spherical reflecting mirror 112 is disposed at the other side of the first concave spherical reflecting mirror 111 through the corresponding bi-directional adjusting devices 4, and the third concave spherical reflecting mirror 113 and the blade prism reflecting mirror 12 are located at the left side or the right side, and the three bi-directional adjusting devices 4 are respectively used to adjust the orientations of the reflecting surfaces of the corresponding second concave spherical reflecting mirror 112, the third concave spherical reflecting mirror 113 and the fourth concave spherical reflecting mirror 114.
Wherein, the bidirectional regulating device 4 can adopt the universal ball, and the three-way regulating device 3 can adopt the combination of a universal ball cooperation length fine tuning pole to form, and wherein length fine tuning pole is vertical to be set up, the universal ball is installed in length fine tuning pole's upper end, by length fine tuning pole height adjustment blade prism speculum 12, and the orientation that its blade side was used for adjusting to the universal ball on it.
Referring to fig. 4-6, the solid small circles in the middle of the first concave spherical mirror, the knife edge prism mirror, and the second concave spherical mirror represent the light spots of the incoming beam, while the dashed small circles represent the light spots of the return beam, wherein the light beam is incoming Cheng Guangshu in the stage of propagating from the knife edge prism mirror to the second concave spherical mirror, and the return beam is propagating from the second concave spherical mirror to the knife edge prism mirror, wherein the incoming Cheng Guangshu, return beam, and outgoing beam refer to the name definitions of the same beam at different positions.
Example 3
This example provides a spectrometer comprising a gas cell as described in example 2 that has high sensitivity with little sample size requirements and at the same time high sensitivity.
In the above embodiments, the number of beam reflections inside the multiplication light path may be increased by adjusting the angles of the knife edge prism reflector, the second concave spherical reflector, the third concave spherical reflector and the fourth concave spherical reflector, and the number of beam reflections that may be generated may be expressed as the following formula: 4 (N) is +1) or 4 (N) rs +1), where N is To the number of incoming light spots Cheng Guangshu generated on the first concave spherical mirror surface, N rs For the number of return light spots generated by the return light beam on the first concave spherical mirror surface, the number of entrance light spots on the first concave spherical mirror surface is equal to the number of return light spots N rs ＝N is 。
In the technical scheme of the utility model, the relation between the light intensity of the emergent light beam and the light intensity of the incident light beam of the multiplication light path can be expressed as the following formula I' =I 0 ×(R c ) n ×(R k ) 2 Wherein I' represents the intensity of the outgoing beam, I 0 Representing the intensity of the incident beam, R c Representing the reflectivity of the concave spherical mirrors in the beam-mirror plate set, n representing the total number of reflections of the beam over all the concave spherical mirrors in the beam-mirror plate set, R k Representing the reflectivity of the blade prism reflector.
In the disclosure scheme of the patent document with the document number of CN112683804A, the relation between the emergent light intensity and the incident light beam intensity of the gas pool can be expressed as the following formula I' =I 0 ×(R c ) n ×R s ×T s Wherein I' represents the intensity of the outgoing beam of the gas cell therein, I 0 Representing the intensity of the incident beam of light, R, of a gas cell therein c Representing the reflectivity of the concave spherical mirrors in the beam-mirror plate set therein, n represents the total number of reflections of the beam over the concave spherical mirrors in the beam-mirror plate set therein, R s Representing the reflectivity of the beam splitter, T s Representative thereofTransmittance of the beam splitter. Typically, the sum of the reflectivity and the transmissivity of a beam splitter is 100%, and when a beam splitter reflects one beam and transmits the same beam, the beam splitter reflectivity or transmissivity is typically 50%, respectively, and in the ideal case of a concave spherical mirror, a total optimum output efficiency of 25% with respect to the incident beam energy can be achieved.
In the technical scheme of the utility model, the reflectivity of the two reflecting surfaces of the blade prism reflector is generally in the range of 90% -99%, and ideally the reflectivity is close to 100%, which is far higher than the total optimal output efficiency of 25% after the light beams are respectively reflected and transmitted by the beam splitter. In other words, the same beam reflection lens group 11 is configured, and the energy of the final outgoing beam in the technical scheme of the utility model can be improved by about 4 times compared with the energy of the outgoing beam in the technical scheme of CN112683804a, which effectively improves the optical signal output energy and the signal to noise ratio of the gas cell optical system.
The foregoing description of the preferred embodiments of the utility model is not intended to limit the utility model to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the utility model are intended to be included within the scope of the utility model.
Claims (8)
1. The utility model provides a multiplication light path, its characterized in that includes beam reflection lens group (11) and has two reflecting surfaces and two intersecting blade prism reflectors (12), blade prism reflectors (12) set up one side of beam reflection lens group (11), incident light beam is through blade prism reflectors (12) reflection extremely beam reflection lens group (11), and in the back reflection of multiple in beam reflection lens group (11) back extremely blade prism reflectors (12), and by blade prism reflectors (12) are with the outgoing light beam after the return beam reflection follow the same direction of incident light beam is penetrated.
2. The multiplying optical path according to claim 1, wherein the beam mirror group (11) comprises a first concave spherical mirror (111), a second concave spherical mirror (112), a third concave spherical mirror (113) and a fourth concave spherical mirror (114); the first concave spherical reflector (111) and the second concave spherical reflector (112) are arranged at intervals from left to right, the third concave spherical reflector (113) and the fourth concave spherical reflector (114) are arranged at intervals along left and right directions and are positioned at the rear side of the first concave spherical reflector (111), the reflecting surfaces of the first concave spherical reflector (111) and the second concave spherical reflector (112) face backwards, the reflecting surfaces of the third concave spherical reflector (113) and the fourth concave spherical reflector (114) face forwards, the third concave spherical reflector (113) are positioned at one side, close to the knife-edge prism reflector (12), of the fourth concave spherical reflector (114), the knife-edge prism reflector (12) is arranged at one side, far away from the second concave spherical reflector (112), of the first concave spherical reflector (111), and incident light beams are emitted to the third concave spherical reflector (113) through the knife-edge prism reflector (12) and are emitted to the third concave spherical reflector (113), the knife-edge prism reflector (12) and are reflected to the fourth concave spherical reflector (112) through the knife-edge prism reflector (12) and the knife-edge prism reflector (12) many times.
3. The multiplying optical path of claim 2, wherein the blade prism mirror (12) is a blade right angle prism mirror.
4. A multiplication optical path according to claim 2 or 3, wherein the first concave spherical mirror (111) is a convex concave spherical mirror.
5. A gas cell comprising a housing (2) and a multiplication optical path according to any one of claims 2 to 4, wherein the housing (2) is disposed in a front-rear direction, the housing (2) has an entrance window (21) and an exit window (22), and the entrance window (21) and the exit window (22) are disposed on left and right sides or upper and lower sides of a front end of the housing (2) relatively, the multiplication optical path is disposed in the housing (2), and the knife-edge prism reflector (12) is disposed between the entrance window (21) and the exit window (22), and the incident beam is incident into the housing (2) through the entrance window (21) and reflected to the beam reflection lens group (11) through the knife-edge prism reflector (12), and is reflected from the beam reflection lens group (11) to the knife-edge prism reflector (12) and exits through the exit window (22).
6. A gas cell according to claim 5, characterized in that the blade prism mirror (12) is mounted between the entrance window (21) and the exit window (22) by means of a three-way adjustment device (3), the three-way adjustment device (3) being used to adjust the horizontal height of the blade prism mirror (12) and the orientation of the blade side.
7. The gas cell of claim 6, further comprising three bi-directional adjustment devices (4), wherein three bi-directional adjustment devices (4) are respectively disposed corresponding to the second concave spherical mirror (112), the third concave spherical mirror (113) and the fourth concave spherical mirror (114) are respectively disposed at the rear end of the housing (2) through the corresponding bi-directional adjustment devices (4), the first concave spherical mirror (111) is disposed at the front end of the housing (2) and is located behind the knife prism mirror (12), the second concave spherical mirror (112) is disposed at the other side of the first concave spherical mirror (111) through the corresponding bi-directional adjustment devices (4), and the third concave spherical mirror (113) and the knife prism mirror (12) are respectively disposed at the left side or the right side, and the three bi-directional adjustment devices (4) are respectively used to adjust the corresponding second concave spherical mirror (112), the third concave spherical mirror (112) and the fourth concave spherical mirror (114).
8. A spectrometer comprising a gas cell as claimed in any one of claims 5 to 7.
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| CN202122714912.3U CN219302261U (en) | 2021-11-08 | 2021-11-08 | Multiplication light path, gas tank and spectrometer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114088630A (en) * | 2021-11-08 | 2022-02-25 | 浙江航天恒嘉数据科技有限公司 | Multiplication light path, gas cell and spectrometer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114088630A (en) * | 2021-11-08 | 2022-02-25 | 浙江航天恒嘉数据科技有限公司 | Multiplication light path, gas cell and spectrometer |
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