Ultraviolet short-optical-path gas absorption cell
By designing a UV short-path gas absorption tank, the problem of cleaning difficulties of UV gas chambers and the environmental impact of infrared systems is solved, convenient cleaning and efficient detection are achieved, and it is suitable for accurate measurement of high-concentration gases.
Patent Information
- Application Number
- CN202421504663.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-27
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-06-27
AI Technical Summary
The existing ultraviolet air chamber cannot be disassembled, cleaned or disassembled, which affects the accuracy of detection. The infrared principle online monitoring system is greatly affected by temperature, pressure and water vapor, and is complex in maintenance.
Design an ultraviolet short-path gas absorber, including a removable pressure plate and lens structure, which is directly assembled with the light source without optical fiber connection, simplifying installation and adjustment, reducing light intensity loss, and easy cleaning of optical lenses.
It realizes convenient optical lens cleaning, reduces light intensity loss, saves costs, improves detection accuracy, reduces the impact on temperature, pressure and water vapor, and is suitable for the detection of high concentrations of SO2 and NOx.
Smart Images
Figure CN223154838U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of gas detection, in particular to an ultraviolet short-path gas absorption cell. Background Art
[0002] Differential optical absorption spectroscopy (DOAS) can detect multi-component gases such as SO2 and NOx. The DOAS online monitoring system is less affected by impurities such as dust and water vapor in the flue gas and can work stably.
[0003] In the past, infrared-based online monitoring systems were often used to measure high concentrations of SO2 and NO in flue gas. However, infrared-based online monitoring systems are greatly affected by temperature, pressure, and water vapor, and infrared modules are easily corroded, requiring certain maintenance and cleaning. X The effect is more accurate than the infrared principle, but there is a problem that the UV chamber cannot be disassembled for cleaning or is troublesome to disassemble. Summary of the invention
[0004] In order to overcome the shortcomings of the prior art, the utility model proposes an ultraviolet short-path gas absorption cell, which is easy to install and adjust, can be directly assembled with the light source, does not require optical fiber, reduces light intensity loss, saves costs, and is easy to clean the optical lens without affecting the optical path structure.
[0005] To achieve the above-mentioned purpose, the utility model discloses an ultraviolet short-path gas absorption cell, comprising a chamber, a light input end of the chamber connected to a light output seat, an end of the light output seat away from the chamber connected to a light source, a light output end of the chamber connected to a light input seat, an optical fiber connector connected to the light input seat, an opening is provided on the side wall of the chamber, a pressure plate is detachably mounted on the chamber opening, and an air intake and exhaust assembly is provided on the pressure plate.
[0006] Furthermore, the light output seat is a hollow cylindrical structure, and a first step and a second step are sequentially provided inside the light output seat in a direction away from the light source. The inner diameter of the light output seat at the first step is smaller than the inner diameter of the light output seat at the second step, and the inner diameter of the light output seat at the second step is smaller than the inner diameter of the light output seat close to one end of the chamber. A first lens is provided on the first step, and a first window is provided on the second step.
[0007] Furthermore, a first pressure ring is provided between the first window and the first lens, and a second pressure ring is provided on a side of the first window facing away from the first lens.
[0008] Further, the light incident seat is a hollow cylindrical structure. The light incident seat is successively provided with a third step and a fourth step along the direction away from the light source. The inner diameter of the light incident seat at the fourth step is smaller than the inner diameter of the light incident seat at the third step, and the inner diameter of the light incident seat at the third step is smaller than the inner diameter of the light incident seat near one end of the chamber. A second lens is provided on the fourth step, and a second window is provided on the third step.
[0009] Further, a fourth retaining ring is provided between the second window and the second lens, and a third retaining ring is provided on the side of the second window facing away from the second lens.
[0010] Further, a mounting seat is connected to the light source, and a pressing plate is connected to the light incident end of the chamber. The pressing plate cooperates with the mounting seat to mount the chamber on the light source.
[0011] Further, there are 3 interfaces on the pressing plate, and the air inlet and exhaust assembly includes a first gas path joint, a second gas path joint, and a third gas path joint respectively connected to the 3 interfaces on the pressing plate.
[0012] The ultraviolet short optical path gas absorption cell of the present utility model is convenient to assemble and adjust, is directly assembled with the light source without using optical fibers, reduces light intensity loss, saves costs, and is convenient for cleaning the optical lenses without affecting the optical path structure. Description of the Drawings
[0013] The present utility model will be further described and elaborated below with reference to the drawings.
[0014] Figure 1 is a schematic structural diagram of the ultraviolet short optical path gas absorption cell of the preferred embodiment of the present utility model.
[0015] Figure 2 is Figure 1 a cross-sectional view taken along line A-A in
[0016] Figure 3 is an exploded view of the ultraviolet short optical path gas absorption cell.
[0017] Reference numerals: 1, chamber; 2, light output seat; 21, first step; 22, second step; 23, first lens; 24, first retaining ring; 25, first window; 26, second retaining ring; 3, light incident seat; 31, third step; 32, fourth step; 33, second lens; 34, third retaining ring; 35, second window; 36, fourth retaining ring; 4, light source; 41, mounting seat; 42, mounting plate; 5, fiber optic connector; 6, pressing plate; 61, first gas path joint; 62, second gas path joint; 63, third gas path joint. Detailed Embodiments
[0018] The technical solutions of the present utility model will be more clearly and completely described below by describing the preferred embodiments of the present utility model with reference to the drawings.
[0019] As Figure 1 and Figure 2 shown, the ultraviolet short optical path gas absorption cell of the preferred embodiment of the present utility model includes a cylindrical chamber 1. The light incident end of the chamber 1 is threadedly connected with a light output seat 2, and a light source 4 is connected to one end of the light output seat 2 away from the chamber 1. The light output end of the chamber 1 is threadedly connected with a light input seat 3, and an optical fiber connector 5 is connected to the light input seat 3. The optical fiber connector 5 is connected to a spectrometer through an optical fiber. By detecting the change in the light intensity from the ultraviolet light emitted by the light source 4 to the light emitted from the optical fiber connector 5, the gas concentration absorbed in the chamber 1 is deduced according to the Beer-Lambert law.
[0020] As Figure 2 and Figure 3 shown, the light output seat 2 is a hollow cylindrical structure. Inside the light output seat 2, a first step 21 and a second step 22 are sequentially provided along the direction away from the light source 4. The inner diameter of the light output seat 2 at the first step 21 is smaller than the inner diameter of the light output seat 2 at the second step 22, and the inner diameter of the light output seat 2 at the second step 22 is smaller than the inner diameter of the light output seat 2 close to the chamber 1. A first lens 23 is provided on the first step 21, and the first lens 23 is used to converge the light emitted by the light source 4. A first window pane 25 is provided on the second step 22. The first window pane 25 is used to protect the first lens 23 from being contaminated and to prevent gas leakage from the chamber 1. A first retaining ring 24 is provided between the first window pane 25 and the first lens 23, and the first retaining ring 24 fixes the first lens 23 on the first step 21. A second retaining ring 26 is provided on the side of the first window pane 25 away from the first lens 23, and the second retaining ring 26 fixes the first window pane 25 on the second step 22.
[0021] As Figure 2 and Figure 3 shown, similar to the structure of the light output seat 2, the light input seat 3 is a hollow cylindrical structure. Along the direction away from the light source 4, a third step 31 and a fourth step 32 are sequentially provided on the light input seat 3. The inner diameter of the light input seat 3 at the fourth step 32 is smaller than the inner diameter of the light input seat 3 at the third step 31, and the inner diameter of the light input seat 3 at the third step 31 is smaller than the inner diameter of the light input seat 3 close to the chamber 1. A second lens 33 is provided on the fourth step 32, and a second window pane 35 is provided on the third step 31. The second window pane 35 is used to protect the first lens 23 from being contaminated and to prevent gas leakage from the chamber 1. A fourth retaining ring 36 is provided between the second window pane 35 and the second lens 33, and the fourth retaining ring 36 fixes the second lens 33 on the fourth step 32. A third retaining ring 34 is provided on the side of the second window pane 35 away from the second lens 33, and the third retaining ring 34 fixes the second window pane 35 on the third step 31.
[0022] As Figure 2 and Figure 3As shown, a mounting base 41 is connected to the light source 4, and a mounting plate 42 is connected to the light incident end of the chamber 1. The mounting plate 42 and the mounting base 41 cooperate to mount the chamber 1 on the light source 4. By directly mounting the chamber 1 on the light source 4, the optical fiber connecting the chamber 1 and the light source 4 can be omitted, reducing the loss of light intensity and simultaneously reducing the cost.
[0023] As Figure 2 and Figure 3 shown, an opening is provided on the side wall of the chamber 1, and a pressing plate 6 is detachably mounted on the opening of the chamber 1 by four M3×3 screws. Three interfaces are provided on the pressing plate 6, and a first gas path connector 61, a second gas path connector 62, and a third gas path connector 63 are respectively connected to the three interfaces on the pressing plate 6. The first gas path interface is used to introduce the gas to be measured, the second gas path interface is used to externally connect a temperature sensor, and the third gas path interface is used to output the gas to be measured. When the first window 25 and the second window 35 need to be cleaned, only the pressing plate 6 needs to be removed and the lens can be cleaned with a cotton swab, which has no influence on the optical path structure.
[0024] The ultraviolet short optical path gas absorption cell of the present utility model is convenient to assemble and adjust, is directly assembled with the light source without an optical fiber, reduces the light intensity loss, saves cost, and is convenient to clean the optical lens. Only the pressing plate needs to be removed, which has no influence on the optical path structure. The cavity is short, and the ultraviolet principle can be used to detect high-concentration SO2 and NOx, with little influence from temperature, pressure, and water vapor, and the detection is accurate; moreover, to detect other concentration gases, only different-length cavities need to be designed, and the change is convenient.
[0025] The above specific embodiments only describe the preferred embodiments of the present utility model, rather than limiting the protection scope of the present utility model. Without departing from the design concept and spirit scope of the present utility model, various deformations, substitutions, and improvements made by those of ordinary skill in the art to the technical solutions of the present utility model based on the text description and drawings provided by the present utility model shall all fall within the protection scope of the present utility model. The protection scope of the present utility model is determined by the claims.
Claims
1. An ultraviolet short optical path gas absorption cell, characterized in that, The invention comprises a chamber (1), wherein the light inlet end of the chamber (1) is connected to a light outlet seat (2), the light outlet seat (2) is connected to a light source (4) at one end facing away from the chamber (1), the light outlet end of the chamber (1) is connected to a light inlet seat (3), the light inlet seat (3) is connected to an optical fiber connector (5), an opening is provided on a side wall of the chamber (1), a pressure plate (6) is detachably mounted on the opening of the chamber (1), and an air inlet and outlet assembly is provided on the pressure plate (6).
2. The ultraviolet short optical path gas absorption cell according to claim 1, wherein The light output seat (2) is a hollow cylindrical structure. A first step (21) and a second step (22) are sequentially arranged inside the light output seat (2) in a direction away from the light source (4). The inner diameter of the light output seat (2) at the first step (21) is smaller than the inner diameter of the light output seat (2) at the second step (22). The inner diameter of the light output seat (2) at the second step (22) is smaller than the inner diameter of the light output seat (2) at one end close to the chamber (1). A first lens (23) is arranged on the first step (21), and a first window sheet (25) is arranged on the second step (22).
3. The ultraviolet short optical path gas absorption cell according to claim 2, wherein A first pressure ring (24) is provided between the first window sheet (25) and the first lens (23), and a second pressure ring (26) is provided on a side of the first window sheet (25) facing away from the first lens (23).
4. The ultraviolet short optical path gas absorption cell according to claim 2, characterized in that, The light intake seat (3) is a hollow cylindrical structure. The light intake seat (3) is provided with a third step (31) and a fourth step (32) in sequence along a direction away from the light source (4). The inner diameter of the light intake seat (3) at the fourth step (32) is smaller than the inner diameter of the light intake seat (3) at the third step (31). The inner diameter of the light intake seat (3) at the third step (31) is smaller than the inner diameter of the light intake seat (3) at one end close to the chamber (1). The fourth step (32) is provided with a second lens (33), and the third step (31) is provided with a second window (35).
5. The ultraviolet short optical path gas absorption cell according to claim 4, characterized in that, A fourth pressure ring (36) is provided between the second window plate (35) and the second lens (33), and a third pressure ring (34) is provided on the side of the second window plate (35) facing away from the second lens (33).
6. The ultraviolet short optical path gas absorption cell according to claim 2, characterized in that, The light source (4) is connected to a mounting seat (41), the light inlet end of the chamber (1) is connected to a mounting plate (42), and the mounting plate (42) cooperates with the mounting seat (41) to mount the chamber (1) on the light source (4).
7. The ultraviolet short optical path gas absorption cell according to claim 1, characterized in that The pressing plate (6) is provided with three interfaces, and the air intake and exhaust assembly comprises a first air path connector (61), a second air path connector (62) and a third air path connector (63) respectively connected to the three interfaces on the pressing plate (6).