阅读说明：本技术 一种多档可变气体吸收池 (Multi-gear variable gas absorption pool ) 是由 张子辉 王淑荣 林冠宇 黄煜 杨小虎 李占峰 于 2019-12-19 设计创作，主要内容包括：一种多档可变气体吸收池涉及气体吸收池技术领域,解决了现有结构复杂、受温度影响较大的问题,包括准直系统、第一调节机构、第二调节机构、第一道威棱镜、第二道威棱镜、气室空腔、耦合系统和多模光纤；当第一调节机构和第二调节机构均为安装状态时,光束依次经准直系统、第一调节机构、第一气室空腔、第一道威棱镜、第二气室空腔、第一调节机构、第三气室空腔、第二调节机构、第四气室空腔、第二道威棱镜、第五气室空腔、第二调节机构、耦合系统、多模光纤；当均为拆卸状态时,光束依次经准直系统、第三气室空腔、耦合系统后进入到多模光纤。本发明结构紧凑,形式简单,成本低；对温度变化不敏感,具有系统精度要求低,应用广泛,能量利用率高。(A multi-gear variable gas absorption cell relates to the technical field of gas absorption cells, solves the problems of complex structure and large influence of temperature in the prior art, and comprises a collimation system, a first adjusting mechanism, a second adjusting mechanism, a first dove prism, a second dove prism, a gas chamber cavity, a coupling system and a multimode fiber; when the first adjusting mechanism and the second adjusting mechanism are both in an installation state, the light beams sequentially pass through the collimating system, the first adjusting mechanism, the first air chamber cavity, the first dove prism, the second air chamber cavity, the first adjusting mechanism, the third air chamber cavity, the second adjusting mechanism, the fourth air chamber cavity, the second dove prism, the fifth air chamber cavity, the second adjusting mechanism, the coupling system and the multimode optical fiber; when the optical fiber is in a disassembly state, the light beam enters the multimode optical fiber after sequentially passing through the collimation system, the third air chamber cavity and the coupling system. The invention has compact structure, simple form and low cost; the device is insensitive to temperature change, and has the advantages of low system precision requirement, wide application and high energy utilization rate.)

1. A multi-gear variable gas absorption cell is characterized by comprising a collimation system (1), a first adjusting mechanism (2), a second adjusting mechanism (3), a first dove prism (4), a second dove prism (5), a first air chamber cavity (9), a second air chamber cavity (10), a third air chamber cavity (11), a fourth air chamber cavity (12), a fifth air chamber cavity (13), a coupling system (7) and a multimode optical fiber (8);

when the first adjusting mechanism (2) and the second adjusting mechanism (3) are in an installation state, incident light beams enter the multimode optical fiber (8) after being collimated by the collimating system (1), reflected by the first adjusting mechanism (2), reflected by the first air chamber cavity (9), reflected by the first dove prism (4), reflected by the second air chamber cavity (10), reflected by the first adjusting mechanism (2), reflected by the third air chamber cavity (11), reflected by the second adjusting mechanism (3), reflected by the fourth air chamber cavity (12), reflected by the second dove prism (5), reflected by the fifth air chamber cavity (13), reflected by the second adjusting mechanism (3) and focused by the coupling system (7); when the first adjusting mechanism (2) and the second adjusting mechanism (3) are in a detachable state, the incident light beam enters the multimode optical fiber (8) after being collimated by the collimating system (1), focused by the third air chamber cavity (11) and the coupling system (7) in sequence.

2. A multi-stage variable gas absorption cell according to claim 1, wherein the first adjustment mechanism (2) is disposed corresponding to the collimation system (1), the second adjustment mechanism (3) is disposed corresponding to the coupling system (7), both the first adjustment mechanism (2) and the second adjustment mechanism (3) are detachable, the first dove prism (4) is disposed corresponding to the first adjustment mechanism (2), and the second dove prism (5) is disposed corresponding to the second adjustment mechanism (3).

3. The absorption cell as claimed in claim 1, further comprising a third dove prism (6), wherein the third dove prism (6) is disposed in the third gas chamber cavity (11), and the light beam incident on the third gas chamber cavity (11) exits after the light beam propagation direction is changed by 180 ° by the third dove prism (6).

4. A multi-stage variable gas absorption cell as claimed in claim 1, wherein said collimating system (1) and coupling system (7) each employ off-axis parabolic mirrors.

5. The absorption cell as claimed in claim 1, wherein the first adjustment mechanism (2) comprises a first reflector (2.1) and a second reflector (2.2), and when the first adjustment mechanism (2) is in the installation state, the incident beam enters the third air chamber cavity (11) after being collimated by the collimation system (1), reflected by the first reflector (2.1), reflected by the first air chamber cavity (9), reflected by the first dove prism (4), reflected by the second air chamber cavity (10) and reflected by the second reflector (2.2) in sequence.

6. A multistage variable gas absorption cell according to claim 5, wherein said first (2.1) and second (2.2) mirrors are triangular mirrors.

7. The absorption cell as claimed in claim 1, wherein the second adjustment mechanism (3) comprises a third reflector (3.1) and a fourth reflector (3.2), and when the second adjustment mechanism (3) is in the installation state, the light beam emitted from the third air chamber cavity (11) sequentially enters the coupling system (7) after being reflected by the third reflector (3.1), the fourth air chamber cavity (12), the second dove prism (5), the fifth air chamber cavity (13) and the fourth reflector (3.2).

8. A multi-stage variable gas absorption cell as claimed in claim 7, characterized in that said third (3.1) and fourth (3.2) mirrors are triangular mirrors.

9. A multi-stage variable gas absorption cell as claimed in claim 1, wherein the light beams passing through the first (9), second (10), fourth (12) and fifth (13) gas chamber cavities are all perpendicular to the light beam incident on the third gas chamber cavity (11).

Technical Field

The invention relates to the technical field of gas absorption tanks, in particular to a multi-gear variable gas absorption tank.

Background

With the development of industry in China, sulfides, nitrogen oxides and the like in smoke are used as important components for emission of industrial pollution sources, so that the smoke can damage atmospheric environment and harm human health, is one of important causes of urban haze, reduces urban visibility, destroys earth radiation balance and influences global climate. Due to the environmental hazards of these harmful emissions, on-line monitoring of the flue gas emissions from stationary pollution sources is required for effective control and remediation. In recent years, the ultraviolet differential absorption spectroscopy (DOAS) has received more and more attention due to the advantages of no need of sampling, easy operation, real-time analysis of multiple components, high sensitivity, low price and the like. According to the Lambert-beer law, the absorption degree of the gas to be measured to light has a linear relation with the optical path of the gas and the concentration of the gas. However, in the actual measurement process, the linear relationship is established only when the concentration of the gas to be measured is low, and when the concentration of the gas to be measured is high, the linear relationship between the measured concentration value and the absorbance is not presented any more. The detection range and the optical path of the DOAS instrument are in negative correlation, and the resolution and the detection lower limit of the DOAS instrument are in positive correlation with the optical path. Therefore, under the same optical path, a large range, high detection resolution and low detection lower limit cannot be realized simultaneously, which is also a common problem of the existing DOAS smoke detection instrument. In order to solve the problem, a miniaturized variable optical path ultraviolet differential spectrum detection technology is provided, and meanwhile, the smoke wide-range high-precision low-detection lower limit is reduced.

At present, most of researches on absorption gas cells focus on the aspect of increasing absorption optical distances, and few researches on adjustable optical distances of the gas cells are carried out. At present, most of adjustable absorption gas pools adopt White structures, the structures are complex, and the influences on factors such as temperature are large.

Disclosure of Invention

The invention provides a multi-gear variable gas absorption pool, aiming at solving the problems that the existing absorption gas pool with an adjustable optical path has a complex structure and is greatly influenced by temperature.

The technical scheme adopted by the invention for solving the technical problem is as follows:

a multi-gear variable gas absorption cell comprises a collimation system, a first adjusting mechanism, a second adjusting mechanism, a first dove prism, a second dove prism, a first air chamber cavity, a second air chamber cavity, a third air chamber cavity, a fourth air chamber cavity, a fifth air chamber cavity, a coupling system and a multimode fiber;

when the first adjusting mechanism and the second adjusting mechanism are in an installation state, an incident beam enters the multimode optical fiber after being sequentially subjected to collimation by a collimation system, reflection by the first adjusting mechanism, cavity of a first air chamber, reflection by a first dove prism, cavity of a second air chamber, reflection by the first adjusting mechanism, cavity of a third air chamber, reflection by a second adjusting mechanism, cavity of a fourth air chamber, reflection by a second dove prism, cavity of a fifth air chamber, reflection by the second adjusting mechanism and focusing by a coupling system; when the first adjusting mechanism and the second adjusting mechanism are in a detachable state, the incident beam enters the multimode optical fiber after being collimated by the collimating system, focused by the third air chamber cavity and the coupling system in sequence.

The invention has the beneficial effects that:

1. the adjustment of the optical path of the gas absorption cell is rapidly realized through the detachable first adjusting mechanism and the detachable second adjusting mechanism, the adjustment of the optical path length of the gas absorption cell can be realized through modular design, and the increase of adjustment gears is reduced.

2. The structure size can be reduced while the optical path is increased by adopting the dove prism.

3. Through adopting collimation system, light is the parallel light at the air chamber in-process, and the expend with heat and contract with cold that the temperature caused can not cause transmission path's change, has guaranteed that the ability utilization ratio is unchangeable. Meanwhile, the gas pool can not only input an optical fiber light source, but also directly input a divergent light source, so that the utilization rate of the light source is improved.

4. The multi-gear variable gas absorption cell simultaneously realizes the large range and low detection lower limit of flue gas and realizes the miniaturization of the multi-gear adjustable gas absorption cell. The invention has compact structure, simple form and low cost; and the system is insensitive to temperature change, and has the advantages of low system precision requirement, wide application and high energy utilization rate.

Drawings

Fig. 1 is a schematic structural diagram of a first embodiment of a multi-stage variable gas absorption cell according to the present invention.

Fig. 2 is a schematic structural diagram of a second embodiment of a multi-stage variable gas absorption cell according to the present invention.

In the figure: 1. the device comprises a collimation system, 2, a first adjusting mechanism, 2.1, a first reflector, 2.2, a second reflector, 3, a second adjusting mechanism, 3.1, a third reflector, 3.2, a fourth reflector, 4, a first dove prism, 5, a second dove prism, 6, a third dove prism, 7, a coupling system, 8, a multimode optical fiber, 9, a first air chamber cavity, 10, a second air chamber cavity, 11, a third air chamber cavity, 12, a fourth air chamber cavity, 13 and a fifth air chamber cavity.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

A multi-gear variable gas absorption cell comprises a collimation system 1, a gas chamber, a first adjusting mechanism 2, a second adjusting mechanism 3, a first dove prism 4, a second dove prism 5, a coupling system 7 and a multimode optical fiber 8. The gas absorption cell may further comprise a third dove prism 6. Wherein the air chamber comprises a first air chamber cavity 9, a second air chamber cavity 10, a third air chamber cavity 11, a fourth air chamber cavity 12 and a fifth air chamber cavity 13.

The first adjusting mechanism 2 is arranged corresponding to the collimating system 1, and the second adjusting mechanism 3 is arranged corresponding to the coupling system 7; the coupling system 7 is arranged corresponding to the multimode optical fiber 8, the first air chamber cavity 9 and the second air chamber cavity 10 are arranged corresponding to the first adjusting mechanism 2, and the first dove prism 4 is arranged corresponding to the first air chamber cavity 9 and the second air chamber cavity 10 at the same time, namely the first dove prism 4 is arranged corresponding to the first adjusting mechanism 2; the third air chamber cavity 11 corresponds to the first adjusting mechanism 2 and the second adjusting mechanism 3 at the same time, namely one end is provided with the first adjusting mechanism 2, and the other end is provided with the second adjusting mechanism 3; the fourth air chamber cavity 12 and the fifth air chamber cavity 13 are arranged corresponding to the second adjusting mechanism 3, and the second dove prism 5 is arranged corresponding to the fourth air chamber cavity 12 and the fifth air chamber cavity 13 at the same time, namely, the second dove prisms 5 are arranged corresponding to the second adjusting mechanism 3; the first adjusting mechanism 2 is positioned between the collimating system 1 and the third gas chamber cavity 11 and the first adjusting mechanism 2 is detachable, and the second adjusting mechanism 3 is positioned between the coupling system 7 and the third gas chamber cavity 11 and the second adjusting mechanism 3 is detachable.

The first adjusting mechanism 2 can be positioned in the light path or can be detached to enable the first adjusting mechanism not to be positioned in the light path, the second adjusting mechanism 3 can be positioned in the light path or can be detached to enable the second adjusting mechanism not to be positioned in the light path, the first adjusting mechanism 2 can be inserted into or pulled out of the light path system, the insertion is an installation state, the pulling is a detachment state, the first adjusting mechanism 2 is in an installation state, the first adjusting mechanism 2 is positioned between the collimation system 1 and the third air chamber cavity 11, the first adjusting mechanism 2 is in a detachment state, the first adjusting mechanism 2 is detached from the light path, and light beams do not pass through the first adjusting mechanism; the second adjusting mechanism 3 is installed in a state that the second adjusting mechanism 3 is located between the coupling system 7 and the third air chamber cavity 11, and the second adjusting mechanism 3 is disassembled in a state that the second adjusting mechanism 3 is disassembled from the light path, and the light beam does not pass through the second adjusting mechanism 3. When the first adjusting mechanism 2 and the second adjusting mechanism 3 are both in an installation state, an incident beam enters the multimode optical fiber 8 after being collimated by the collimating system 1, reflected by the first adjusting mechanism 2, reflected by the first air chamber cavity 9, reflected by the first dove prism 4, reflected by the second air chamber cavity 10, reflected by the first adjusting mechanism 2, reflected by the third air chamber cavity 11, reflected by the second adjusting mechanism 3, reflected by the fourth air chamber cavity 12, reflected by the second dove prism 5, reflected by the fifth air chamber cavity 13, reflected by the second adjusting mechanism 3 and focused by the coupling system 7 in sequence. When the first adjusting mechanism 2 is in an installation state and the second adjusting mechanism 3 is in a disassembly state, an incident beam enters the multimode optical fiber 8 after being sequentially collimated by the collimating system 1, reflected by the first adjusting mechanism 2, reflected by the first air chamber cavity 9, reflected by the first dove prism 4, reflected by the second air chamber cavity 10, reflected by the first adjusting mechanism 2, reflected by the third air chamber cavity 11 and focused by the coupling system 7. When the first adjusting mechanism 2 is in a detached state and the second adjusting mechanism 3 is in an installed state, an incident beam enters the multimode optical fiber 8 after being collimated by the collimating system 1, reflected by the third air chamber cavity 11, the second adjusting mechanism 3, reflected by the fourth air chamber cavity 12, reflected by the second dove prism 5, reflected by the fifth air chamber cavity 13, reflected by the second adjusting mechanism 3 and focused by the coupling system 7 in sequence. When the first adjusting mechanism 2 and the second adjusting mechanism 3 are in a detached state, the incident light beam enters the multimode optical fiber 8 after being collimated by the collimating system 1, focused by the third air chamber cavity 11 and the coupling system 7 in sequence.

The first adjusting mechanism 2 comprises a first reflecting mirror 2.1 and a second reflecting mirror 2.2, the second adjusting mechanism 3 comprises a third reflecting mirror 3.1 and a fourth reflecting mirror 3.2, and the first reflecting mirror 2.1, the second reflecting mirror 2.2, the third reflecting mirror 3.1 and the fourth reflecting mirror 3.2 are all triangular reflecting mirrors. The first reflector 2.1 is arranged corresponding to the collimation system 1 and the first air chamber cavity 9 and is positioned between the collimation system 1 and the first air chamber cavity 9, and the first reflector 2.1 can reflect the light beams emitted from the collimation system 1 to the first air chamber cavity 9; the second reflector 2.2 is arranged corresponding to the second air chamber cavity 10 and the third air chamber cavity 11, is positioned between the second air chamber cavity 10 and the third air chamber cavity 11, and can reflect the light beams emitted from the second air chamber cavity 10 to the third air chamber cavity 11; the third reflector 3.1 is arranged corresponding to the third air chamber cavity 11 and the fourth air chamber cavity 12, is positioned between the third air chamber cavity 11 and the fourth air chamber cavity 12, and can reflect the light beams emitted from the third air chamber cavity 11 to the fourth air chamber cavity 12; the fourth reflector 3.2 is arranged corresponding to the fifth gas chamber cavity 13 and the coupling system 7, is positioned between the fifth gas chamber cavity 13 and the coupling system 7, and can reflect the light beams emitted from the fifth gas chamber cavity 13 to the coupling system 7. The collimation system 1 and the coupling system 7 both use off-axis parabolic mirrors.

One embodiment of the present invention is shown in FIG. 1: in fig. 1, the collimating system 1, the first reflector 2.1, the second reflector 2.2, the third gas chamber cavity 11, the third reflector 3.1, the fourth reflector 3.2 and the coupling system 7 are arranged in sequence along a straight line. The first reflector 2.1, the second reflector 2.2, the third reflector 3.1 and the fourth reflector 3.2 can be detached and can be inserted and pulled out along the direction perpendicular to the paper surface, the first reflector 2.1 and the second reflector 2.2 are simultaneously installed or detached, and the third reflector 3.1 and the fourth reflector 3.2 are simultaneously installed or detached.

When the first adjusting mechanism 2 and the second adjusting mechanism 3 are both in an installation state, an incident beam sequentially passes through the collimation system 1 for collimation, the first reflector 2.1 for reflection, the first air chamber cavity 9 and the first dove prism 4 for reflection to change the propagation direction of the beam by 180 degrees, the second air chamber cavity 10, the second reflector 2.2 for reflection, the third air chamber cavity 11, the third reflector 3.1 for reflection, the fourth air chamber cavity 12 and the second dove prism 5 for reflection to change the propagation direction of the beam by 180 degrees, the fifth air chamber cavity 13 and the fourth reflector 3.2 for reflection, and the coupling system 7 for coupling and focusing, and then enters the multimode optical fiber 8. When the first adjusting mechanism 2 is in a disassembly state, the light beam directly enters the third air chamber cavity 11 without passing through the first air chamber cavity 9 and the second air chamber cavity 10. When the second adjusting mechanism 3 is in a disassembled state, the light beam directly enters the coupling system 7 after passing through the third air chamber cavity 11 and without passing through the fourth air chamber cavity 12 and the fifth air chamber cavity 13. The light beams passing through the first, second, fourth and fifth gas cell cavities 9, 10, 12 and 13 are all perpendicular to the light beam incident on the third gas cell cavity 11. The gas absorption cell shown in fig. 1, L1, L2, L3, L4 and L5 respectively represent the absorption optical paths of the first gas chamber cavity 9, the second gas chamber cavity 10, the third gas chamber cavity 11, the fourth gas chamber cavity 12 and the fifth gas chamber cavity 13, and the total absorption optical path length of the gas absorption cell is L1+ L2+ L3+ L4+ L5; if the first adjusting mechanism 2 is pulled out in the direction vertical to the paper surface, the parallel light emitted by the collimating system 1 directly irradiates the third reflector 3.1, and the total absorption optical path length of the absorption cell is L3+ L4+ L5; similarly, if the second adjusting structure is pulled out along the direction perpendicular to the paper surface, the optical path length of the absorption cell is L1+ L2+ L3; if the two adjusting mechanisms are pulled out along the direction vertical to the paper surface, the optical path length of the absorption cell is equal to L3, and the multi-gear adjustment of the absorption optical path of the gas cell is realized by the method.

A second embodiment of the invention is shown in figure 2, and differs from the first embodiment in that the gas absorption cell comprises a third dove prism 6. The third dove prism 6 is located between the second mirror 2.2 and the third mirror 3.1, i.e. is arranged in the third gas cell cavity 11. The light beam entering the third air chamber cavity 11 is emitted after the propagation direction of the light beam is changed by 180 degrees through the third dove prism 6. The volume and the structure of the gas absorption cell are further reduced by arranging the third dove prism 6, the third dove prism 6 is arranged in the middle of the cavity 11 of the third gas chamber, and light rays are folded and superposed to form the structure shown in fig. 2. After the improvement, the two first adjusting mechanisms 2 and the two second adjusting mechanisms 3 are combined and integrated into a total adjusting mechanism. The general adjusting mechanism is adjusted to be inserted and pulled out of the adjusting structure along the X-axis direction in fig. 2, the first gear is the position limited in fig. 2, the second gear is the position where the second adjusting mechanism 3 is pulled out of the first adjusting mechanism 2, the original position refers to the position of the first adjusting mechanism 2 when the first adjusting mechanism 2 and the second adjusting mechanism 3 are both in the installation state, or the second gear is the position where the first adjusting mechanism 2 is pulled out of the second adjusting mechanism 3 (the original position refers to the position of the first adjusting mechanism 2 when the first adjusting mechanism 2 and the second adjusting mechanism 3 are both in the installation state), and the third gear is the position where the first adjusting mechanism 2 and the second adjusting mechanism 3 are both pulled out. By adopting the method, the multi-gear adjustment of the optical path of the gas absorption cell can be realized. If the third dove prism 6 in fig. 2 is replaced by another set of the first adjusting mechanism 2, the second adjusting mechanism 3, the first dove prism 4 and the second dove prism 5 in fig. 2 to form an integral structure, the lengthening of the optical path and the increase of the gear can be realized, and finally the modular design of the absorption pool system is realized.

The invention relates to a multi-gear variable gas absorption cell, wherein a first dove prism 4, a second dove prism 5 and a third dove prism 6 can be arranged in a gas chamber or outside the gas chamber, preferably in the gas chamber. The first adjusting mechanism 2 and the second adjusting mechanism 3 may be disposed in or outside the air chamber, preferably outside the air chamber. The collimating system 1 is typically arranged outside the gas chamber, and the coupling system 7 may be arranged inside the gas chamber. In the embodiment, a first dove prism 4, a second dove prism 5, a third dove prism 6 and a coupling system 7 are arranged in the air chamber, the multimode optical fiber 8 corresponds to the coupling system 7 and is connected with the air chamber shell, and the collimation system 1 is arranged outside the air chamber and is connected with the air chamber shell. A first air chamber cavity 9 is arranged in the air chamber and between the first reflector 2.1 and the first dove prism 4; a second air chamber cavity 10 is arranged in the air chamber and between the second reflecting mirror 2.2 and the first dove prism 4; a fourth air chamber cavity 12 is arranged in the air chamber and between the third reflector 3.1 and the second dove prism 5; a fifth air chamber cavity 13 is arranged in the air chamber and between the fourth reflector 3.2 and the second dove prism 5; in the first embodiment, a third air chamber cavity 11 is arranged in the air chamber and between the second reflector 2.2 and the third reflector 3.1; in the second embodiment, a third air chamber cavity 11 is formed in the air chamber, between the second reflector 2.2 and the third dove prism 6, and in the air chamber, between the third reflector 3.1 and the third dove prism 6.

The multi-gear variable gas absorption cell adopts a simple structure, the optical path of the gas absorption cell can be quickly adjusted by the detachable first adjusting mechanism 2 and the detachable second adjusting mechanism 3 (the plug-in triangular reflector), the optical path length of the gas absorption cell can be adjusted by modular design, and the increase of adjusting gears is reduced. The invention has the advantages of low system precision requirement, low production price, insensitivity to environmental temperature and the like. Meanwhile, the gas pool can not only input an optical fiber light source, but also directly input a divergent light source, so that the utilization rate of the light source is improved.

The collimation system 1 and the coupling system 7 adopt off-axis parabolic reflectors, so that chromatic aberration and spherical aberration can be eliminated, the system aberration is ensured to be minimum, and the structure is simplest. The adoption of the dove prism can reduce the structure size while increasing the optical path. Light is parallel light in the air chamber propagation process, and the expansion with heat and contraction with cold that the temperature caused can not cause transmission path's change, has guaranteed that the ability utilization ratio is unchangeable.

The multi-gear variable gas absorption cell simultaneously realizes the large range and low detection lower limit of flue gas and realizes the miniaturization of the multi-gear adjustable gas absorption cell. The invention has compact structure, simple form and low cost; and the device is insensitive to temperature change, wide in application and high in energy utilization rate.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.