CN217033596U

CN217033596U - High accuracy DOAS gas chamber structure

Info

Publication number: CN217033596U
Application number: CN202123422690.4U
Authority: CN
Inventors: 王相; 刘啸; 刘晓伟; 庞喜龙; 宋肖君
Original assignee: Weihai Jingxun Changtong Electronic Technology Co Ltd
Current assignee: Weihai Jingxun Changtong Electronic Technology Co Ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-07-22
Anticipated expiration: 2031-12-31

Abstract

The utility model provides a high-precision DOAS gas chamber structure, and belongs to the technical field of gas detection. The technical scheme is as follows: a high-precision DOAS gas chamber structure comprises a shell with two open ends, wherein one end of the shell is provided with a front cover, and the other end of the shell is provided with a rear cover; the glass slide pressing frame is provided with a concave surface reflector, the inner side of the rear cover is provided with a rear positioning plate, and one side of the rear positioning plate facing the front cover is symmetrically provided with two concave surface reflectors; two ventilation columns are arranged on the shell. The utility model has the beneficial effects that: adopt white pond principle structure, the components of a whole that can function independently equipment, simple to operate, whole gas tightness is good, and inside concave surface speculum can fix a position the installation, and the product uniformity is high, and then can improve and detect the precision.

Description

High accuracy DOAS gas chamber structure

Technical Field

The utility model relates to the technical field of gas detection, in particular to a high-precision DOAS gas chamber structure.

Background

The DOAS technique (Differential Optical Absorption Spectroscopy) was proposed in the 70 th 20 th century by PLATT et al, who used the property that various gas molecules in the atmosphere have different Differential absorptions to them in different wave bands to invert the concentration of these trace gases in the atmosphere when light was transmitted in the atmosphere. Besides external detection devices such as a spectrometer, a gas chamber capable of providing a light path for light is also needed in the DOAS system, and the longer the light path is, the higher the detection accuracy is. At present, in most cases, gas chambers are assembled manually, and in the manual assembly process, due to errors caused by manual operation, structural consistency among the gas chambers is difficult to guarantee, so that a light path is changed, and the detection precision of the system is reduced.

Disclosure of Invention

In view of the above problems in the prior art, an object of the present invention is to provide a high-precision DOAS gas chamber structure, which adopts the white cell principle structure, extends the detection light path, is assembled separately, is convenient to install, has good overall air tightness, can position and install the internal concave reflector, has high product consistency, and further can improve the detection precision.

The utility model is realized by the following technical scheme: a high-precision DOAS gas chamber structure comprises a shell with two open ends, wherein one end of the shell is provided with a front cover, and the other end of the shell is provided with a rear cover; the glass slide pressing frame is provided with a concave surface reflector, the inner side of the rear cover is provided with a rear positioning plate, and one side of the rear positioning plate facing the front cover is symmetrically provided with two concave surface reflectors; two ventilation columns are arranged on the shell. The device adopts the white cell principle, the white cell is a gas absorption cell capable of realizing multiple reflection of incident light, three concave reflectors with the same curvature radius are utilized to realize multiple reflection of light beams, and the optical path can be adjusted by adjusting the reflection times. The front cover, the shell and the rear cover form a gas chamber, and corresponding gas is injected into the gas chamber through the ventilation column; and the light beam passes through the light-transmitting slide from the incident light coupler to enter the gas chamber, and finally passes through the light-transmitting slide to reach the emergent light coupler after being reflected for multiple times.

Furthermore, a slide groove is formed in the front cover, the incident hole and the emergent hole are symmetrically formed in two ends of the slide groove, and the slide is clamped in the slide groove. And sealing rings are arranged on the periphery of the glass slide contacting the bottom of the glass slide groove to improve the air tightness, and the incident hole and the emergent hole are arranged in the area surrounded by the sealing rings. Through the setting of slide recess, not only improve the gas tightness, can also ensure the installation uniformity of printing opacity slide.

Further, the slide pressing frame is a rectangular frame, the rectangular frame can press the slide tightly, and the inner frame of the rectangular frame at least covers the incident hole and the emergent hole. And fixing the slide pressing frame on the front cover through a screw or a bolt.

Furthermore, a first clamping groove is formed in the middle of the slide pressing frame and located between the incident hole and the emergent hole, a front positioning plate is clamped in the first clamping groove, and a concave reflector is arranged on the front positioning plate. Through the location installation is carried out to a pair of preceding locating plate of draw-in groove, can realize the location installation of concave surface speculum, keeps apart concave surface speculum and slide simultaneously, reduces light interference.

Furthermore, a socket type positioning structure is arranged between the rear positioning plate and the bottom plate. The socket joint formula location structural style differs, through the boss recess of mutually supporting, perhaps cylinder cooperation blind hole all can realize. Considering that there is no fixing device at the outer side of the rear positioning plate, the rear positioning plate can be adhered to the bottom plate in an adhesive manner.

Furthermore, the contact surfaces of the rear positioning plate and the two concave reflectors are inclined surfaces, and the two inclined surfaces are V-shaped. Two inclined planes which are symmetrically arranged in a V shape can change the refraction times by changing the V-shaped angle.

Furthermore, each inclined plane is provided with a second clamping groove capable of clamping the concave reflecting mirror. And the pair of concave reflectors are positioned and installed through the clamping grooves.

Furthermore, draw-in groove two is greater than the width of concave surface speculum on width direction for can adjust the concave surface speculum and be in position in the draw-in groove two, and then change the interval of two concave surface speculuses on the inclined plane, the specification of cooperation V type inclined plane and concave surface speculum all can change the refraction number of times.

Furthermore, the edge of the second clamping groove is provided with scale marks, so that the concave reflecting mirror can be conveniently and accurately positioned to be installed.

Further, the front cover and the rear cover are respectively provided with a sealing strip between the contact surfaces of the shell, and the front cover and the rear cover are respectively fixed on the shell through bolts.

The utility model has the beneficial effects that: the utility model adopts a white cell principle structure, is assembled in a split way, is convenient to install, has good integral air tightness, can position and install the internal concave reflector, has high product consistency and can further improve the detection precision.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic structural view of a front cover portion.

Fig. 3 is a schematic diagram of the exploded structure of fig. 2.

Fig. 4 is a schematic structural view of a rear cover portion.

Fig. 5 is a schematic diagram of the exploded structure of fig. 4.

Fig. 6 is a schematic structural view of the rear positioning plate.

Fig. 7 is a schematic diagram of light path reflection.

Wherein the reference numerals are: 100. a housing; 101. ventilating columns; 102. an incident light coupler; 103. an emergent light coupler; 200. a front cover; 201. entering a perforation hole; 202. an exit aperture; 203. a glass slide groove; 204. a light-transmitting slide; 205. pressing the glass slide into a frame; 206. a first clamping groove; 207. a front positioning plate; 300. a rear cover; 301. positioning a groove; 302. a rear positioning plate; 303. positioning the boss; 304. an inclined surface; 305. a second clamping groove; 306. scale lines; 400. a concave reflector.

Detailed Description

In order to clearly explain the technical features of the present solution, the present solution is explained by the following detailed description.

The first embodiment, referring to fig. 1-7, is realized by the following technical scheme: a high-precision DOAS gas chamber structure comprises a shell 100 with two open ends, a front cover 200 arranged at one end and a rear cover 300 arranged at the other end; the front cover 200 is provided with an incident hole 201 and an emergent hole 202, the outer side of the front cover 200 is correspondingly provided with an incident light coupler 102 and an emergent light coupler 103, the inner side of the front cover 200 is sequentially provided with a light-transmitting slide 204, a slide pressing frame 205, and a concave reflector 400 is arranged on the slide pressing frame 205, the inner side of the rear cover 300 is provided with a rear positioning plate 302, and one side of the rear positioning plate 302 facing the front cover 200 is symmetrically provided with two concave reflectors 400; two vent posts 101 are provided on the housing 100.

The front cover 200 is provided with a slide groove 203, the incident hole 201 and the exit hole 202 are symmetrically arranged at two ends of the slide groove 203, and the slide is clamped in the slide groove 203. And sealing rings are arranged on the periphery of the contact of the slide glass and the bottom of the slide glass groove 203 to improve the air tightness, and the incident hole 201 and the emergent hole 202 are arranged in the area surrounded by the sealing rings. By the arrangement of the slide groove 203, not only the airtightness is improved, but also the mounting uniformity of the light-transmitting slide 204 can be ensured.

The slide pressing frame 205 is a rectangular frame capable of pressing the slide and an inner frame of the rectangular frame covers at least the entrance hole 201 and the exit hole 202. The slide frame 205 is fixed to the front cover 200 by screws or bolts.

A first clamping groove 206 is arranged in the middle of the slide pressing frame 205 and between the incident hole 201 and the emergent hole 202, a front positioning plate 207 is clamped in the first clamping groove 206, and a concave reflector 400 is arranged on the front positioning plate 207. The front positioning plate 207 is positioned and installed through the first clamping groove 206, so that the positioning and installation of the concave reflector 400 can be realized, the concave reflector 400 and the glass slide 204 are isolated, and the light interference is reduced. The concave reflector 400 may be disposed on the front positioning plate 207 by gluing, and then the front positioning plate 207 is fixed in the first slot 206 by gluing.

A socket type positioning structure is arranged between the rear positioning plate 302 and the bottom plate. The socket positioning structure has different forms, as shown in fig. 5-6, a positioning boss 303 is arranged on the rear positioning plate 302, a positioning groove 301 is arranged on the bottom plate, the positioning boss 303 is matched with the positioning groove 301 for positioning, the contact surface of the rear positioning plate 302 and the bottom plate is coated with glue, and the rear positioning plate 302 is adhered to the bottom plate in a gluing mode.

The contact surfaces of the rear positioning plate 302 and the two concave mirrors 400 are inclined surfaces 304, and the two inclined surfaces 304 are V-shaped. The refraction times can be changed by changing the angle of the V-shaped surfaces 304 which are symmetrically arranged in the V shape.

Each inclined surface 304 is provided with a second clamping groove 305 capable of clamping the concave reflecting mirror 400. The concave reflecting mirror 400 is positioned and installed through the first clamping groove 206.

The second slot 305 is larger than the width of the concave reflector 400 in the width direction, so that the position of the concave reflector 400 in the second slot 305 can be adjusted, the distance between the two concave reflectors 400 on the inclined plane 304 can be changed, and the refraction times can be changed by matching the specifications of the V-shaped inclined plane 304 and the concave reflector 400.

The edge of the second clamping groove 305 is provided with scale marks 306, so that the concave reflecting mirror 400 can be accurately positioned and mounted conveniently.

Sealing strips are arranged between the contact surfaces of the front cover 200 and the back cover 300 and the shell 100, and the front cover 200 and the back cover 300 are fixed on the shell 100 through bolts.

The device adopts the white cell principle, as shown in fig. 7, the white cell is a gas absorption cell which can realize multiple reflection of incident light, multiple reflection of light beams is realized by using three concave reflecting mirrors 400 with the same curvature radius, and the optical path can be adjusted by adjusting the reflection times. The front cover 200, the shell 100 and the rear cover 300 form a gas chamber, and corresponding gas is injected into the gas chamber through the vent columns 101; the light beam enters the gas chamber from the incident light coupler 102 through the light-transmitting slide 204, and finally reaches the emergent light coupler 103 through the light-transmitting slide 204 after being reflected for multiple times; the structure of the device is provided with a positioning structure, such as various clamping grooves, scale marks 306 and the like, and the consistency of manual assembly can be improved.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings, which are merely for convenience in describing the present invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the utility model, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.

The technical features of the present invention which are not described in the above embodiments may be implemented by or using the prior art, and are not described herein again, of course, the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and variations, modifications, additions or substitutions which may be made by those skilled in the art within the spirit and scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A high-precision DOAS gas chamber structure is characterized by comprising a shell with two open ends, wherein one end of the shell is provided with a front cover, and the other end of the shell is provided with a rear cover; the glass slide pressing frame is provided with a concave surface reflector, the inner side of the rear cover is provided with a rear positioning plate, and one side of the rear positioning plate facing the front cover is symmetrically provided with two concave surface reflectors; two ventilation columns are arranged on the shell.

2. A high accuracy DOAS gas chamber structure as in claim 1 wherein the front cover has a slide recess, the entrance and exit holes are symmetrically disposed at both ends of the slide recess, and the slide is captured in the slide recess.

3. A high precision DOAS gas cell structure as in claim 2 wherein the slide pressing frame is a rectangular frame capable of pressing the slides and the inner frame of the rectangular frame covers at least the entry and exit apertures.

4. A high accuracy DOAS gas chamber structure as in claim 1 wherein said slide press frame is centered between said entrance aperture and exit aperture and has a first snap-in slot, said first snap-in slot having a front locating plate with a concave reflector thereon.

5. A high accuracy DOAS gas cell structure as in claim 1 wherein a socket locating structure is provided between the back locator plate and the base plate.

6. A high accuracy DOAS gas cell structure as in claim 1 wherein the contact surface of the back positioning plate with the two concave mirrors is a sloped surface, the two sloped surfaces being V-shaped.

7. A high accuracy DOAS gas chamber structure as recited in claim 6, wherein each of said inclined surfaces has a second notch for engaging a concave reflector.

8. A high accuracy DOAS gas cell structure as in claim 7 wherein said second notch is wider than the width of the concave reflector in the width direction.

9. A high accuracy DOAS gas chamber structure as in claim 8, wherein the second slot is provided with a graduation mark on its two side edges.

10. A high accuracy DOAS gas cell structure as in claim 1 wherein sealing strips are provided between the contact surfaces of the front and back covers and the housing, and the front and back covers are bolted to the housing.