CN217404123U - Multiply type gas absorption white pool - Google Patents

Abstract

The utility model relates to a white pond technical field specifically is a gaseous pocket pond of absorbing of multiple multiplication formula, including primary mirror, two secondary mirrors, light incident end, light exit end, typical white pond is constituteed to primary mirror, two secondary mirrors, light incident end, light exit end, still includes the multiplier group, the multiplier group includes plane mirror and plano-concave cylindrical reflector, it is fixed that plane mirror is relative and is the contained angle with the mirror surface of plano-concave cylindrical reflector, the multiplier group accepts the emergent light of secondary mirror to inject typical white pond once more as new incident light with emergent light position offset, accomplish and be more than the reflection of typical white pond optical distance one time at least. Only one multiplying lens group is added, and the multiplying lens group is fixed at a proper position in a proper size, so that multiple times of optical path multiplication of a typical white cell can be realized.

Description

Multiply gas absorption white pond

Technical Field

The utility model relates to a gaseous absorption pond technical field specifically is a gaseous absorption white pond of formula of multiplying many times.

Background

The optical white cell is a gas absorption cell which realizes a long optical path by reflecting light beams back and forth for multiple times in a cell body.

In the prior art, the concentration of gas is usually detected by adopting the Lambert-Beer law, and the principle is as follows: when the infrared beam passes through the gas to be detected, the gas absorbs the infrared signal. From Lambert-Beer's law, the gas molecule absorbance is proportional to the absorption optical path, the gas molecule concentration and the gas molecule absorption coefficient. While different gas molecules have different gas molecule absorption characteristics. Therefore, the concentration of the absorbed gas molecules can be quantitatively inverted by performing spectral analysis on the absorbance spectrum after absorption by the gas. With the increasing requirement for accuracy in the field of gas detection, the optical path length of the optical gas absorption cell needs to be further increased. Longer optical paths are required in a limited space, requiring an absorption cell to achieve more reflections.

The increase in optical length causes two problems: 1. the optical absorption cell has large volume, which causes the instrument to be heavy, 2, the optical path is long, the reflection times are increased, which causes the light intensity to be low and the signal-to-noise ratio to be poor.

Chinese patent (application publication No. CN 106290218A) discloses an ultra-trace gas concentration detection system, which uses a corner reflector to rotate an optical path to increase the optical path, and the solution has the following disadvantages: 1. when the corner reflector is used, the light beam can run out of the secondary mirror, so that the light intensity can be greatly reduced; 2. the corner reflector is difficult to install and debug; 3. the optical path is only doubled by adding each corner reflector, and if the optical path is increased by multiple times, the polygon reflector needs to be installed, so that the system volume is overlarge, and the installation and debugging difficulty is further increased.

Chinese patent is an optical path multiplying device and an optical path multiplying gas absorption cell (application publication No. CN113484266A), and the multiplication mirror is added on the basis of a typical white cell optical structure, and the disadvantages are: 1. the optical reflection times can be increased by only one time; 2. the incident position and the emergent position of the light are very close, so that the light source and the detector are inconvenient to install.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a gaseous white pond of absorbing of formula of multiplying many times to solve current white pond and have to increase a multiplier mirror optical distance and only increase one time, light weakens through multiple reflection back light intensity, and the system is bulky, the problem of system installation debugging difficulty.

In order to achieve the above object, the utility model provides a following technical scheme:

a multiply-multiplied gas-absorbing white cell, comprising: including primary mirror, two secondary mirrors, light incidence end, mere exit end, typical white pond is constituteed to primary mirror, two secondary mirrors, light incidence end, mere exit end, on prior art's basis, the utility model discloses still make following improvement: still include the multiplication mirror group, the multiplication mirror group includes plane mirror and plano-concave cylindrical reflector, the plane mirror is relative and be the contained angle fixed with plano-concave cylindrical reflector's mirror surface, the emergent light of secondary mirror is accepted to the multiplication mirror group to incite into typical white pond once more as new incident light with emergent light position offset, accomplish the reflection that is more than typical white pond optical path at least one time.

Preferably, the primary mirror, the first secondary mirror and the second secondary mirror are all spherical mirrors, and the curvature radiuses of the spherical mirrors are the same.

Preferably, an included angle between the plane mirror and the plano-concave cylindrical mirror is denoted as α, the curvature radius of the primary mirror is denoted as R, the focal length of the plano-concave cylindrical mirror is denoted as R2, and R2 satisfy the relationship: r2 ═ R/cos (α/2).

Preferably, the angle α between the plane mirror and the plano-concave cylindrical mirror is 90 °, and R2 satisfy the relationship:

preferably, the plane mirror is directly bonded at the position of the emergent light of the primary mirror, or the size of the primary mirror is reduced, and the plane mirror is fixed in the region where the emergent light deviates from the primary mirror.

Preferably, the light incident end and the light emitting end are separately disposed at one side of the main mirror.

Compared with the prior art, the beneficial effects of the utility model are that:

1. only one multiplying lens group is added and fixed at a proper position in a proper size, so that multiple multiplication of the optical path of a typical white cell can be realized;

2. the size of the main mirror can be reduced, the use of two plane reflectors is reduced, and the difficulty of light adjustment is reduced;

3. when the optical path is the same, the light source of the white cell is close to the central axis, and the aberration is small.

Drawings

FIG. 1 is a schematic diagram of a typical white cell of the prior art;

FIG. 2 is a schematic diagram of the spot positions of a typical white cell primary mirror of the prior art;

fig. 3 is a schematic structural view of the multiple multiplication type gas absorption white cell of the present invention;

fig. 4 is the light spot position schematic diagram of the multiple multiplication type gas absorption white primary mirror of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The optical principle of a typical white cell in the prior art is shown in fig. 1, the white cell is composed of three spherical reflectors with the same curvature radius, incident light is reflected to a secondary lens 1 through a plane reflector 1, is reflected to converge to a primary lens through the secondary lens 1 to form a light spot, is reflected to a secondary lens 2 through the primary lens, and is reflected to converge to the primary lens through the secondary lens 2 to form a light spot again, the embodiment shows that the light is reflected back for 16 times and is emitted through the plane reflector 2 to form 7 light spots on the primary lens, and the positions of the 7 light spots on the primary lens are shown in fig. 2. The typical white cell can adjust the optical path length by adjusting the reflection times of incident light.

Referring to fig. 3 to 4, the multiple multiplication type gas absorption white cell of the present embodiment is further improved over a technical scheme of a typical white cell in the prior art, the white cell of the present embodiment includes a primary mirror 1, two secondary mirrors (a primary mirror 2 and a secondary mirror 3), a light incident end and a light emitting end, the light incident end emits incident light, the light receiving end receives emergent light, the light incident end and the light emitting end of the present embodiment are separately disposed on one side of the primary mirror 1, and light passes through the primary mirror 1 by drilling holes. The main mirror 1, the two secondary mirrors, the light incidence end and the light emergent end form a typical white cell, and light is reflected back and forth between the main mirror and the secondary mirrors.

On the basis of the prior art, the embodiment is further improved as follows: the gaseous white cell that absorbs of formula of multiplying many times of this embodiment still includes the multiplication mirror group, the multiplication mirror group includes plane mirror 4 and plano-concave cylindrical surface speculum 5, plane mirror 4 is relative and be contained angle alpha fixed with plano-concave cylindrical surface speculum 5's mirror surface, the emergent light of secondary mirror is accepted to the multiplication mirror group to incite into typical white cell once more as new incident light with emergent light position deviation, accomplish the reflection that is more than typical white cell optical path at least one time.

As shown in fig. 1, in a typical white cell, the 7 th light spot formed on the primary lens is an emergent light spot, and if the multiplier lens group of this embodiment is directly installed in the region where the emergent light spot is located, multiple times of optical path multiplication can be realized. Specifically, as shown in fig. 3, light reflected from the primary mirror 2 should form a 7 th light spot on the primary mirror 1, but a multiplier lens group is installed in the region, so that the light directly enters the plane mirror 4, is reflected by the plane mirror 4 and enters the plano-concave cylindrical mirror 5, is emitted by the plano-concave cylindrical mirror 5 and then enters the primary mirror 2 again, and then enters the primary mirror 1 after being reflected by the primary mirror 2, so that the light is shifted to generate the 7 th light spot shown in fig. 4, and under the action of the multiplier lens group, emergent light of an original typical white cell is reflected back to the primary mirror 1 and is reflected back and forth in the typical white cell again as new incident light, thereby increasing the optical path by one time. In this embodiment, fig. 3 shows that the light rays are incident into the multiplier lens group twice, that is, the light rays are shifted twice and double multiplication is completed, and fig. 4 shows the position relationship of the light spots on the primary mirror 1 after double multiplication. The multiplying mirror group of this embodiment can specifically complete several times of optical path multiplication, which is determined according to the size and the installation position of the used plane mirror 4 and the plane concave cylindrical mirror 5, that is, on the premise of not shielding the light incident end and the light emergent end, the multiplying mirror group is set to have a proper size and installed at a proper position to realize multiple times of optical path multiplication.

As a preferred embodiment of the present invention, the primary mirror 1, the first secondary mirror 2, and the second secondary mirror 3 are all spherical mirrors, and have the same radius of curvature.

An included angle between the plane mirror 4 and the plano-concave cylindrical mirror 5 is recorded as alpha, the curvature radius of the primary mirror 1 is recorded as R, the focal length of the plano-concave cylindrical mirror 5 is recorded as R2, and R2 satisfy the following relations: r2 ═ R/cos (α/2). The angle α between the plane mirror 4 and the plano-concave cylindrical mirror 5 of the present embodiment is 90 °, and R2 satisfy the relationship:

the radius of curvature R of the primary mirror 1 of the present embodiment is 350mm, and the focal length R2 of the plano-concave cylindrical mirror 5 is 495 mm.

As a preferred embodiment of the present embodiment, the plane mirror 4 may be directly bonded to the position of the primary mirror 1 where light is emitted. The size of the main mirror 1 can be reduced, the area of the emergent light spot of the main mirror 1 can be cut off, and the plane mirror 4 can be fixed in the area.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (6)

1. The utility model provides a gaseous white pond of absorbing of formula of multiplying many times, includes primary mirror, two secondary mirrors, light incidence end, emergent ray end, typical white pond, its characterized in that are constituteed to primary mirror, two secondary mirrors, light incidence end, emergent ray end: still include multiplication mirror group, multiplication mirror group includes plane mirror and plano-concave cylindrical reflector, plane mirror is relative and is the contained angle fixed with plano-concave cylindrical reflector's mirror surface, multiplication mirror group accepts the emergent light of secondary mirror to inject typical white pond once more with emergent light offset as new incident light, accomplish and be more than the reflection of typical white pond optical distance one time at least.

2. A multiply multiplied gas absorption white cell according to claim 1, wherein: the primary mirror, the first secondary mirror and the second secondary mirror are all spherical mirrors, and the curvature radiuses of the primary mirror, the first secondary mirror and the second secondary mirror are the same.

3. A multiple-doubling gas-absorbing white cell as in claim 2, wherein: an included angle between the plane mirror and the plano-concave cylindrical mirror is recorded as alpha, the curvature radius of the primary mirror is recorded as R, the focal length of the plano-concave cylindrical mirror is recorded as R2, and R2 satisfy the following relation: r2 ═ R/cos (α/2).

4. A multiple-multiplication gas-absorbing white cell according to claim 3, wherein: the included angle alpha between the plane reflector and the plano-concave cylindrical reflector is 90 degrees, and R2 satisfy the following relation:

。

5. a multiply multiplied gas absorption white cell according to claim 1, wherein: the plane reflector is directly bonded at the position of the emergent light of the primary mirror, or the size of the primary mirror is reduced, and the plane reflector is fixed in the area where the emergent light deviates from the primary mirror.

6. A multiply-multiplied gas-absorption white cell according to claim 1, wherein: the light incidence end and the light emergent end are separately arranged on one side of the main mirror.

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