Ultraviolet gas cell

Abstract

The utility model is suitable for the technical field of gas analyzers, and provides an ultraviolet gas pool. A gas chamber; the cavity is formed in the gas chamber; the light inlet and the long-optical-path light outlet are arranged on the left side of the cavity in an array mode; the concave reflecting mirror is fixedly mounted on the right side of the cavity; the through hole is formed in the middle of the concave reflecting mirror and the gas chamber; and the short-optical-path light outlet is fixedly mounted on the right side of the through hole. Compared with the prior art, the ultraviolet detector has the beneficial effects that through the arrangement of the light inlet, the long-optical-path light outlet, the concave reflecting mirror, the short-optical-path light outlet and the through hole, purple light rays can be emitted from the long-optical-path light outlets or the short-optical-path light outlets at different positions for detection according to different gas concentrations, so that the ultraviolet rays can be detected in the same gas chamber; meanwhile, long-optical-path and short-optical-path measurement is met, and the gas measurement range is expanded.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas analyzers, and in particular relates to an ultraviolet gas pool. Background Art

[0002] Ultraviolet differential absorption spectroscopy is a commonly used technology for measuring gas composition ratios. It can measure multiple components simultaneously, of which the gas cell is an important component. The absorption path of the gas cell affects the measurement range and sensitivity.

[0003] For high-concentration gas detection, a short optical path gas cell is required to avoid saturation absorption; for low-concentration gas, a long optical path gas cell is required to ensure measurement precision and accuracy. At present, the optical path of the gas cell used is fixed, so its range and sensitivity parameters are also fixed. However, due to unstable on-site processes, the concentration of the same gas may vary greatly, exceeding the range of a single gas chamber or under the same working conditions, when measuring different gases, there may be a situation where the concentration of one gas is very low and the concentration of another gas is very high.

[0004] Therefore, how to provide an ultraviolet gas cell is a problem that those skilled in the art need to solve urgently. Utility Model Content

[0005] The utility model aims to provide an ultraviolet gas pool, aiming to solve the problems mentioned in the background technology.

[0006] The utility model is implemented as follows: an ultraviolet gas pool comprises:

[0007] Gas chamber;

[0008] A cavity, the cavity being opened inside the gas chamber;

[0009] A light inlet and a long optical path light outlet, wherein the light inlet and the long optical path light outlet array are arranged on the left side of the cavity;

[0010] A concave reflecting mirror, wherein the concave reflecting mirror is fixedly mounted on the right side of the cavity;

[0011] A through hole, wherein the through hole is opened in the middle of the concave reflecting mirror and the gas chamber;

[0012] A short optical path light outlet, wherein the short optical path light outlet is fixedly installed on the right side of the through hole;

[0013] An air inlet, the air inlet being fixedly mounted on the left side of the rear end of the cavity;

[0014] An air outlet, the air outlet being fixedly mounted on the right side of the front end of the cavity;

[0015] The air inlet, the cavity, the light entrance, the long optical path light exit, the concave reflector, the short optical path light exit, the air outlet and the through hole form a gas absorption pool.

[0016] Preferably, the light entrance is composed of an optical fiber and a plano-concave lens.

[0017] Preferably, the air inlet and the air outlet are arranged diagonally.

[0018] Preferably, the outer end of the long optical path light outlet is connected to a No. 1 ultraviolet spectrometer, the outer end of the short optical path light outlet is connected to a No. 2 ultraviolet spectrometer, and the length of light received by the long optical path light outlet is twice the length of light received by the short optical path light outlet.

[0019] Preferably, a plano-convex lens is arranged inside the through hole.

[0020] Preferably, the radius of curvature of the concave reflector is equal to the length of the cavity.

[0021] Preferably, the gas chamber is made of stainless steel.

[0022] Compared with the prior art, the utility model has the following beneficial effects: when in use, by setting a cavity in a gas chamber and setting an air inlet and an air outlet on the surface of the cavity, the concentration of the internal gas can be controlled; at the same time, by setting a light inlet, a long light path light outlet, a concave reflector, a short light path light outlet and a through hole, the ultraviolet light can be emitted from the long light path light outlet or the short light path light outlet at different positions for detection according to different gas concentrations, thereby satisfying both long light path and short light path measurements in the same gas chamber, thereby expanding the gas measurement range. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 A schematic structural diagram of an ultraviolet gas cell provided in an embodiment of the utility model.

[0025] In the figure: 1-air inlet, 2-cavity, 3-light entrance, 4-long optical path light exit, 5-concave reflector, 6-short optical path light exit, 7-air outlet, 8-through hole, 9-gas chamber. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0027] The specific implementation of the present utility model is described in detail below in conjunction with specific embodiments.

[0028] like Figure 1 FIG. 1 is a schematic diagram of the structure of an ultraviolet gas pool provided by an embodiment of the utility model, comprising:

[0029] Gas chamber 9;

[0030] A cavity 2, which is opened inside the gas chamber 9;

[0031] The light inlet 3 and the long optical path light outlet 4 are arranged in an array on the left side of the cavity 2;

[0032] A concave reflecting mirror 5, wherein the concave reflecting mirror 5 is fixedly installed on the right side of the cavity 2;

[0033] A through hole 8, which is provided in the middle of the concave reflector 5 and the gas chamber 9;

[0034] A short optical path light outlet 6, which is fixedly mounted on the right side of the through hole 8;

[0035] Air inlet 1, which is fixedly installed on the left side of the rear end of the cavity 2;

[0036] The air outlet 7 is fixedly mounted on the right side of the front end of the cavity 2;

[0037] The gas inlet 1, the cavity 2, the light entrance 3, the long optical path light exit 4, the concave reflector 5, the short optical path light exit 6, the gas outlet 7 and the through hole 8 form a gas absorption cell.

[0038] In the embodiment of the utility model, when in use, when performing gas detection, the gas is discharged into the cavity 2 through the air inlet 1, and then the light inlet 3 is started to shape the emitted ultraviolet light, and after the shaped ultraviolet light is absorbed by the gas, a part of the ultraviolet light is reflected by the concave reflector 5, absorbed by the gas again, and then converged to the long optical path light outlet 4, and then detected by the No. 1 ultraviolet spectrometer preset at the long optical path light outlet 4, so that low-concentration gas can be detected. At the same time, when performing detection, the shaped ultraviolet light will be absorbed by the gas and will pass through the through hole 8 in the middle of the concave reflector 5, and converged to the short optical path light outlet 6, and then detected by the No. 2 ultraviolet spectrometer preset at the short optical path light outlet 6, so that high-concentration gas can be detected;

[0039] A gas absorption pool is formed by combining the air inlet 1, the cavity 2, the light entrance 3, the long optical path light exit 4, the concave reflector 5, the short optical path light exit 6, the air outlet 7 and the through hole 8. When the signal intensity is sufficient, multiple concave reflectors 5 can be arranged in the cavity 2, and the concentration of the internal gas can be changed to form a long optical path gas pool or a short optical path gas pool of different multiples.

[0040] like Figure 1 As shown, as a preferred embodiment of the utility model, the light entrance 3 is composed of an optical fiber and a plano-concave lens.

[0041] In the embodiment of the utility model, when in use, the light inlet 3 is composed of an optical fiber and a plano-concave lens, so as to shape the emitted light, making the light more penetrating and emitted farther.

[0042] like Figure 1 As shown, as a preferred embodiment of the present invention, the air inlet 1 and the air outlet 7 are arranged diagonally.

[0043] In the embodiment of the utility model, when in use, the air inlet 1 and the air outlet 7 are arranged diagonally, so that the gas to be tested can fill the entire cavity 2 evenly and quickly.

[0044] like Figure 1 As shown, as a preferred embodiment of the utility model, the outer end of the long optical path light outlet 4 is connected to a No. 1 ultraviolet spectrometer, the outer end of the short optical path light outlet 6 is connected to a No. 2 ultraviolet spectrometer, and the length of light received by the long optical path light outlet 4 is twice the length of light received by the short optical path light outlet 6.

[0045] In the embodiment of the utility model, when in use, a No. 1 ultraviolet spectrometer is connected to the outer end of the long optical path light outlet 4, and a No. 2 ultraviolet spectrometer is connected to the outer end of the short optical path light outlet 6, so that the ultraviolet rays emitted from the corresponding positions are detected, and by making the length of the light received by the long optical path light outlet 4 twice the length of the light received by the short optical path light outlet 6, long optical path and short optical path measurement and detection can be performed.

[0046] like Figure 1 As shown, as a preferred embodiment of the present utility model, a plano-convex lens is arranged inside the through hole 8.

[0047] In the embodiment of the utility model, when in use, a plano-convex lens is provided inside the through hole 8 , thereby achieving a focusing effect, thereby facilitating the detection of the second ultraviolet spectrometer of the short optical path light outlet 6 .

[0048] like Figure 1 As shown, as a preferred embodiment of the present utility model, the curvature radius of the concave reflector 5 is equal to the length of the cavity 2.

[0049] In the embodiment of the utility model, when in use, by making the radius of curvature of the concave reflector 5 equal to the length of the cavity 2, the light can be reflected back to the other side during reflection, so that a long optical path ultraviolet gas absorption experiment can be performed, making it more diverse.

[0050] like Figure 1 As shown, as a preferred embodiment of the present utility model, the gas chamber 9 is made of stainless steel.

[0051] In the embodiment of the utility model, when in use, the gas chamber 9 is made of stainless steel, so that it has good corrosion resistance, high temperature resistance, easy cleaning and maintenance, and good strength and durability.

[0052] The above embodiment of the utility model provides an ultraviolet gas cell. When in use, when performing gas detection, the gas is discharged into the cavity 2 through the gas inlet 1, and then the light inlet 3 is started. Since the light inlet 3 is composed of an optical fiber and a plano-convex lens, the ultraviolet light passing through the light inlet 3 is shaped;

[0053] During the detection, after the shaped ultraviolet light is absorbed by the gas, a part of the ultraviolet light is reflected by the concave reflector 5, absorbed by the gas again, and then converged to the long optical path light outlet 4, and then detected by the No. 1 ultraviolet spectrometer preset at the long optical path light outlet 4, so that low-concentration gas can be detected;

[0054] At the same time, when testing, the shaped ultraviolet light is absorbed by the gas and then collected at the short optical path light outlet 6 through the through hole 8 in the middle of the concave reflector 5, and then tested by the second ultraviolet spectrometer preset at the short optical path light outlet 6, so that high-concentration gas can be detected;

[0055] By analogy, when the signal strength is sufficient, multiple concave reflectors 5 can be arranged in the cavity 2, and the concentration of the internal gas can be changed to form a long optical path gas pool or a short optical path gas pool of different magnifications.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An ultraviolet gas cell, characterized in that: include; Gas chamber (9); A cavity (2), wherein the cavity (2) is opened inside the gas chamber (9); A light inlet (3) and a long optical path light outlet (4), wherein the light inlet (3) and the long optical path light outlet (4) are arranged in an array on the left side of the cavity (2); A concave reflecting mirror (5), wherein the concave reflecting mirror (5) is fixedly mounted on the right side of the cavity (2); A through hole (8), wherein the through hole (8) is provided in the middle of the concave reflector (5) and the gas chamber (9); A short optical path light outlet (6), wherein the short optical path light outlet (6) is fixedly mounted on the right side of the through hole (8); An air inlet (1), the air inlet (1) being fixedly mounted on the left side of the rear end of the cavity (2); An air outlet (7), the air outlet (7) being fixedly mounted on the right side of the front end of the cavity (2); The air inlet (1), the cavity (2), the light entrance (3), the long optical path light exit (4), the concave reflector (5), the short optical path light exit (6), the air outlet (7) and the through hole (8) form a gas absorption cell.

2. An ultraviolet gas cell according to claim 1, characterized in that: The light inlet (3) is composed of an optical fiber and a plano-concave lens.

3. An ultraviolet gas cell according to claim 1, characterized in that: The air inlet (1) and the air outlet (7) are arranged diagonally.

4. The ultraviolet gas cell according to claim 1, characterized in that: The outer end of the long optical path light outlet (4) is connected to a first ultraviolet spectrometer, and the outer end of the short optical path light outlet (6) is connected to a second ultraviolet spectrometer. The length of light received by the long optical path light outlet (4) is twice the length of light received by the short optical path light outlet (6).

5. The ultraviolet gas cell according to claim 1, characterized in that: A plano-convex lens is arranged inside the through hole (8).

6. The ultraviolet gas cell according to claim 1, characterized in that: The radius of curvature of the concave reflector (5) is equal to the length of the cavity (2).

7. The ultraviolet gas cell according to claim 1, characterized in that: The gas chamber (9) is made of stainless steel.

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