CN117309809A - Laser gas sensor - Google Patents
Laser gas sensor Download PDFInfo
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- CN117309809A CN117309809A CN202311599224.4A CN202311599224A CN117309809A CN 117309809 A CN117309809 A CN 117309809A CN 202311599224 A CN202311599224 A CN 202311599224A CN 117309809 A CN117309809 A CN 117309809A
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- 238000001035 drying Methods 0.000 claims abstract description 90
- 230000007246 mechanism Effects 0.000 claims abstract description 56
- 238000001514 detection method Methods 0.000 claims abstract description 24
- 238000012545 processing Methods 0.000 claims abstract description 15
- 230000008859 change Effects 0.000 claims abstract description 4
- 238000007789 sealing Methods 0.000 claims description 33
- 210000004027 cell Anatomy 0.000 claims description 22
- 210000005056 cell body Anatomy 0.000 claims description 19
- 230000009471 action Effects 0.000 claims description 13
- 239000002274 desiccant Substances 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 17
- 238000005259 measurement Methods 0.000 abstract description 12
- 230000008569 process Effects 0.000 abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 6
- 230000003287 optical effect Effects 0.000 abstract description 3
- 238000010981 drying operation Methods 0.000 description 6
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 3
- 235000017491 Bambusa tulda Nutrition 0.000 description 3
- 241001330002 Bambuseae Species 0.000 description 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 3
- 239000011425 bamboo Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000000862 absorption spectrum Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
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Abstract
The invention provides a laser gas sensor, which comprises a gas tank, a light source module, a photoelectric detection module and a data processing module, wherein a laser beam generated by the light source module is emitted into the gas tank along the axial direction of the gas tank, and the photoelectric detection module is used for detecting the intensity change of an optical signal and converting the intensity change into an electric signal; the data processing module acquires the electric signals and processes the electric signals to obtain a gas concentration detection result; the gas tank comprises a tank body outer cylinder and a tank body inner core frame, wherein an inner side cylinder, a middle cylinder and an outer side cylinder are sequentially fixed in the middle of the tank body inner core frame from inside to outside, and laser beams pass through the inner side cylinder; a plurality of first drying mechanisms are fixed between the outer cylinder and the middle cylinder, and a plurality of second drying mechanisms are fixed between the middle cylinder and the inner cylinder at equal intervals. According to the invention, the gas can be dried twice under the cooperation of the first drying mechanism and the second drying mechanism, so that the water vapor removal rate of the gas is improved, and the measurement accuracy is improved.
Description
Technical Field
The invention belongs to the technical field of gas sensors, and particularly relates to a laser gas sensor.
Background
A gas sensor is a transducer that converts a certain gas volume fraction into a corresponding electrical signal. The probe conditions the gas sample through the gas sensor, which usually comprises a display part of a drying or refrigerating treatment instrument for filtering out impurities and interfering gas, and the gas sensor is widely applied to the fields of safety production, health monitoring, environmental protection, energy saving, basic research and the like. Compared with the conventional gas sensing method based on a semiconductor device, the gas sensing method based on the absorption spectrum technology can finish measurement without an adsorption process and has the advantages of high measurement speed, electromagnetic interference resistance, non-contact measurement and the like.
When the existing laser gas sensor is used, moisture in gas needs to be removed, because the water is a main interference gas in the laser spectrum technology, a wide absorption band exists in the wave band from microwaves to far infrared, the existing method for reducing the moisture interference is to send the gas to be measured into a drying device in advance, and the drying agent in the drying device is beneficial to removing the moisture in the gas and then measuring.
However, because the length of the drying device matched with the existing laser sensor is shorter, the path of the gas in the drying device is shorter, so that the water vapor is not thoroughly removed after the gas passes through the drying device, and the accuracy of the gas sensor is affected.
Disclosure of Invention
The invention aims at the defects of the prior art, and provides a laser gas sensor with a drying function, which can carry out deep drying when gas enters a gas tank of the laser gas sensor.
Specifically, the invention provides a laser gas sensor, which comprises a gas tank, a light source module, a photoelectric detection module and a data processing module;
the light source module is specifically a laser generator for generating a laser beam, and the laser beam generated by the light source module is emitted into the gas tank along the axial direction of the gas tank;
the gas tank comprises a tank body outer cylinder and a tank body inner core frame, the tank body inner core frame is sleeved in the tank body outer cylinder, a laser passing channel is arranged on the axis of the tank body outer cylinder, an inner side cylinder, a middle cylinder and an outer side cylinder are sequentially clamped and fixed in the middle of the tank body inner core frame from inside to outside, the laser passing channel is arranged in the inner side cylinder, and the laser beam passes through the inner side cylinder;
the outer side of the inner cylinder is fixed with a plurality of second drying mechanisms at equal intervals, the outer side of the second drying mechanisms is propped against the inner side of the middle cylinder, the outer side of the middle cylinder is fixed with a plurality of first drying mechanisms, the outer side of the first drying mechanisms is propped against the inner side of the outer cylinder, one side of the middle cylinder, which is far away from the closed end of the outer cylinder of the tank, is provided with at least two first gas through holes, and one side, which is close to the closed end of the outer cylinder of the tank, of the inner cylinder is provided with at least two second gas through holes;
the first drying mechanism is specifically an annular plate which is obliquely and fixedly arranged on the outer side of the middle cylinder, two sealing strips are arranged on the outer side edge of the annular plate, one third part of the annular plate is provided with a drying cavity with two communicated sides, the remaining two thirds part of the annular plate is a solid baffle plate, and the drying cavity is filled with a first gas drying agent; two adjacent first drying mechanisms are symmetrically arranged in the middle cylinder, so that the drying cavities on the plurality of first drying mechanisms are arranged in the area between the outer cylinder and the middle cylinder in a staggered manner, and the channels of the gas are formed in a staggered manner;
the photoelectric detection module is specifically a photoelectric detector, and the laser beam passing through the gas tank completes the detection of the light intensity change after passing through the photoelectric detector and converts the light intensity signal into an electric signal;
the data processing module is connected with the photoelectric detection module through signals, and the electric signals output by the photoelectric detection module are collected and then processed to obtain a gas concentration detection result.
As a further explanation of the present invention, the second drying mechanism is vertically fixed at the outer side of the inner cylinder, the second drying mechanism is a net-shaped annular cavity plate, two sealing strips are arranged on the outer side of the annular cavity plate, and the second drying mechanism is filled with a second gas desiccant.
As a further illustration of the present invention, the number of the second drying mechanisms is not less than the number of the first drying mechanisms.
As a further explanation of the invention, the inner side of the closed end of the outer cylinder of the tank body is provided with a first annular groove and a second annular groove, sealing strips are fixed at the inner side ends of the middle cylinder and the inner cylinder, the sealing strips of the middle cylinder are matched with the first annular groove for use, and the sealing strips of the inner cylinder are matched with the second annular groove for use.
As a further explanation of the present invention, a plurality of rubber sealing rings are fixed on the outer side of the outer cylinder, and the outermost rubber sealing ring is fixed on the outer side edge of the outer cylinder, and is used for completing the sealing connection between the outer side of the outer cylinder and the inner side of the outer cylinder of the cell body.
As a further explanation of the invention, the outer side of the inner core frame of the tank body is also fixed with a rubber connecting sleeve, the opening end of the outer cylinder of the tank body is clamped in the rubber connecting sleeve, and the sealing connection between the outer cylinder of the tank body and the inner core frame of the tank body is completed under the action of the rubber connecting sleeve.
As a further explanation of the invention, one side of the cell outer cylinder, which is close to the closed end of the cell outer cylinder, is fixedly communicated with a gas inlet.
As a further explanation of the invention, the inner core frame of the tank body is provided with a plurality of third gas through holes in a circumferential shape in the surrounding area of the inner side barrel, the inner cavity of the inner core frame of the tank body is provided with a gas buffer cavity, the third gas through holes are communicated with the gas buffer cavity through a gas channel, and the outer side of the inner core frame of the tank body is fixedly provided with a gas outlet communicated with the gas buffer cavity.
Compared with the prior art, the invention has the following advantages:
the laser gas sensor can realize deep drying of the gas to be measured, the gas to be measured flows from left to right in the areas of the outer cylinder and the middle cylinder under the action of pressure after being sent into the space between the outer cylinder and the middle cylinder of the gas pool, primary drying operation of the gas can be completed due to the existence of the first drying mechanism in the flowing process, after the gas initially passes through the first drying mechanism and flows to the rightmost side of the outer cylinder, the gas flows to a plurality of second drying mechanisms between the middle cylinder and the inner cylinder, and the gas can be dried under the action of the second drying mechanisms, so that the secondary drying treatment of the gas can be completed under the cooperation of the first drying mechanism and the second drying mechanism, the water vapor removal rate of the gas is improved, and the measurement precision is further improved.
Drawings
FIG. 1 is a schematic block diagram of a laser gas sensor provided by the present invention;
FIG. 2 is a cross-sectional view of the overall structure of a gas cell in a laser gas sensor provided by the invention;
FIG. 3 is an enlarged view of the structure at 111 in FIG. 2;
FIG. 4 is an enlarged view of the structure at 222 in FIG. 2;
FIG. 5 is a front view of the outer cylinder of the gas cell of the present invention;
FIG. 6 is a front view of the structure of the cell body core frame of the gas cell of the present invention.
Reference numerals illustrate:
100-gas cell; 200-a light source module; 300-a photodetection module; 400-a data processing module;
1-a tank outer cylinder; 11-barrel edges; 12-gas inlet; 13-a first annular groove; 14-a second annular groove; 2-a core frame in the tank body; 21-an inner barrel; 211-a second gas through hole; 22-an intermediate cylinder; 221-a first gas through hole; 23-an outer cylinder; 231-rubber sealing rings; 24-rubber connecting sleeve; 25-a first drying mechanism; 251-drying chamber; 252-solid baffle plate; 26-a second drying mechanism; 27-a third gas through hole; 28-a gas buffer chamber; 281-gas outlet; 29-operating the handle.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the present invention provides a laser gas sensor, which comprises a gas cell 100, a light source module 200, a photoelectric detection module 300 and a data processing module 400;
the light source module 200 is specifically a laser generator for generating a laser beam, and the laser beam generated by the light source module 200 is injected into the gas cell 100 along the axial direction of the gas cell 100;
the photo-detection module 300 is specifically a photo-detector, and the laser beam passing through the gas cell 100 passes through the photo-detector to complete the detection of the light intensity variation and convert the light intensity signal into an electrical signal;
the data processing module 400 is in signal connection with the photoelectric detection module 300, and processes the collected electric signal output by the photoelectric detection module 300 to obtain a gas concentration detection result.
The laser beam generated by the light source module 200 irradiates the gas cell 100 for detecting the target gas, a part of the laser beam is absorbed by the gas, and the other part of the laser beam passes through the gas layer and is then detected by the matched photoelectric detection module 300, the detector converts a certain proportion of optical signals into electric signals, the electric signals are converted into analog voltages by the signal processing circuit in the data processing module 400, finally, a digital value called signal intensity is obtained, the size of the digital value is proportional to the size of the gas concentration, and finally, the detected digital value of the signal intensity can be displayed by the data display device, so that the measurement of the gas concentration can be realized.
As shown in fig. 2 to 6, the gas cell 100 includes a cell outer cylinder 1 and a cell inner core frame 2, the cell inner core frame 2 is sleeved in the cell outer cylinder 1, wherein the cell outer cylinder 1 is provided with a long cylindrical side 11, and a laser passing channel is provided on the axis of the cell outer cylinder 1, and the laser passing channel may specifically be a high lens capable of enabling laser to pass smoothly. The inner core frame 2 of the cell body is sleeved in the cylinder edge 11, an inner cylinder 21, an intermediate cylinder 22 and an outer cylinder 23 are sequentially fixed in the middle of the inner core frame 2 of the cell body from inside to outside, laser beams pass through the inner cylinder 21, the inner cylinder 21 is clamped on the inner core frame 2 of the cell body when the inner core frame 2 of the cell body is installed, then the intermediate cylinder 22 is clamped in the outer area of the inner cylinder 21 outside the inner core frame 2 of the cell body, and finally the outer cylinder 23 is installed on the inner core frame 2 of the cell body close to the outer edge.
Further, a plurality of rubber sealing rings 231 are fixed on the outer side of the outer cylinder 23, and the outermost rubber sealing ring 231 is fixed on the outer side edge of the outer cylinder 23, and the rubber sealing ring 231 is used for completing sealing connection between the outer side of the outer cylinder 23 and the inner side of the cylinder edge 11.
One side of the outer tank body cylinder 1, which is close to the closed end of the outer tank body cylinder 1, is fixedly communicated with a gas inlet 12, and gas to be measured is sent into the gas tank 100 through the gas inlet 12.
Further, a rubber connecting sleeve 24 is fixed on the outer side of the inner core frame 2 of the tank body, the opening end of the outer tank cylinder 1 is clamped in the rubber connecting sleeve 24, and the sealing connection between the outer tank cylinder 1 and the inner core frame 2 of the tank body is completed under the action of the rubber connecting sleeve 24.
The outside of middle section of thick bamboo 22 is fixed with a plurality of first drying mechanism 25, the outside of first drying mechanism 25 supports the inboard at outside section of thick bamboo 23, first drying mechanism 25 is the annular slab in the middle section of thick bamboo 22 outside of slope specifically, the annular slab outside edge is provided with twice sealing strip, and twice sealing strip has improved the leakproofness in the outside of first drying mechanism 25, the third portion of annular slab sets up to the drying chamber 251 of both sides intercommunication, and the remaining two-thirds part is solid baffle 252, the drying chamber 251 intussuseption is filled with first gas drier, and first gas drier specifically is 3A type molecular sieve drier.
In order to improve the disorder degree in the gas circulation process, two adjacent first drying mechanisms 25 are symmetrically arranged in the middle cylinder 22, so that the drying cavities 251 on the first drying mechanisms 25 are arranged in the area between the outer cylinder 23 and the middle cylinder 22 in a staggered manner, as shown in fig. 2, after the gas to be detected is sent between the outer cylinder 23 and the middle cylinder 22 through the gas inlet 12, as the gas communication area is arranged at the position of the outer cylinder 23 close to the gas inlet 12, the gas flows from left to right along the area of the outer cylinder 23 and the middle cylinder 22 under the action of pressure, and in the flowing process, due to the existence of the first drying mechanisms 25, the gas forms turbulent flow areas to disturb the gas channels, so that the contact time and the contact area between the gas and the first gas drying agent can be increased under the action of the first drying mechanisms 25, and the gas channels on the first drying mechanisms 251 are arranged in the area between the outer cylinder 23 and the middle cylinder 22 in a staggered manner, namely, the gas channels can form a vertically staggered manner, thereby the phenomenon that the gas water content near the bottom can be prevented from being higher and unable to thoroughly dry can be generated, and the drying efficiency of the gas can be improved, and the primary drying operation of the gas can be completed.
At least two first gas through holes 221 are formed in one side, far away from the closed end of the cell body outer cylinder 1, of the middle cylinder 22, after gas initially passing through the first drying mechanism 25 flows to the rightmost side of the outer cylinder 23, the gas flows between the middle cylinder 22 and the inner cylinder 21 through the first gas through holes 221, a plurality of second drying mechanisms 26 are fixed between the middle cylinder 22 and the inner cylinder 21 at equal intervals, the second drying mechanisms 26 are vertically fixed on the outer side of the inner cylinder 21, the second drying mechanisms 26 are meshed annular cavity plates, two sealing strips are arranged on the outer side edges of the annular cavity plates, the sealing performance of an area between two adjacent second drying mechanisms 26 can be improved, and second gas drying agents are filled in the second drying mechanisms 26, and the gas can sequentially pass through the second drying mechanisms 26 again, and is subjected to deep drying operation of secondary drying by the second gas drying agents in the second drying mechanisms 26.
Further, in order to improve the quality of the secondary drying operation, the number of the second drying mechanisms 26 is not smaller than the number of the first drying mechanisms 25.
At least two second gas through holes 211 are formed in one side of the inner cylinder 21, which is close to the closed end of the outer cylinder 1 of the cell body, and after the gas subjected to secondary drying treatment flows to the leftmost area between the middle cylinder 22 and the inner cylinder 21, the gas flows into the inner cylinder 21 under the action of the second gas through holes 211.
The middle area of the inner cylinder 21 is a laser channel, after the gas subjected to twice drying treatment flows into the inner cylinder 21, a laser beam is started to perform laser detection, the laser beam is shown by an arrow in fig. 2, the gas absorbs one part of the laser beam, the other part of the laser beam passes through a gas layer and is then detected by a matched photoelectric detector, and the detected signal intensity digital value is displayed by matching a data processing device and a data display device to finish the measurement of the gas concentration.
In order to facilitate normal feeding of gas in the measurement process, a plurality of third gas through holes 27 are circumferentially formed in the surrounding area of the inner barrel 21 on the core frame 2 in the cell body, and the third gas through holes 27 are distributed at the inner side edge close to the inner barrel 21, so that interference generated when laser beams pass can be avoided.
The inner cavity of the cell body inner core frame 2 is provided with a gas buffer cavity 28, a third gas through hole 27 is communicated with the gas buffer cavity 28 through a gas channel, a gas outlet 281 communicated with the gas buffer cavity 28 is fixed on the outer side of the cell body inner core frame 2, and after sequentially passing through the third gas through hole 27, the gas channel and the gas buffer cavity 28, gas is discharged through the gas outlet 281, so that the whole gas measurement process is completed.
In order to improve the air tightness of the joint between the tank body outer cylinder 1 and the inner side of the tank body inner core frame 2, the inner side of the closed end of the tank body outer cylinder 1 is provided with a first annular groove 13 and a second annular groove 14, the inner side ends of the middle cylinder 22 and the inner side cylinder 21 are respectively fixed with sealing strips, the sealing strips of the middle cylinder 22 are matched with the first annular groove 13, and the sealing strips of the inner side cylinder 21 are matched with the second annular groove 14, so that the gas flowing areas between the middle cylinder 22 and the inner side cylinder 21 are not interfered with each other under the action of the matched sealing strips of the first annular groove 13 and the second annular groove 14, and the measurement accuracy is improved.
In order to facilitate assembly and use, the lengths of the middle cylinder 22 and the inner cylinder 21 are the same, the length of the outer cylinder 23 is smaller than that of the middle cylinder 22, an operation handle 29 is fixed on the outer side of the inner cylinder 21 in the outer side of the cell body core frame 2, and the operation handle 29 facilitates assembly connection between the outer cylinder 1 of the cell body and the inner core frame 2 of the cell body.
In summary, when the laser gas sensor is used, the laser 200 and the matched measuring devices, namely the photodetector 300, the data processing device 400, the data display device and the like, are arranged on two sides of the gas tank 100, then the gas to be measured is sent into the gas tank 100 through the gas inlet 12, the gas is sent into the region between the outer cylinder 23 and the middle cylinder 22 after being sent into the gas tank 100, and the gas forms turbulent flow regions to disturb the gas channels due to the existence of the first drying mechanism 25 in the flowing process, so that the contact time and the contact area between the gas and the first gas drying agent can be increased under the action of the plurality of first drying mechanisms 25, and the drying cavities 251 on the plurality of first drying mechanisms 25 are alternately arranged in the region between the outer cylinder 23 and the middle cylinder 22, namely the gas channels can form a vertically staggered form, thereby avoiding the phenomenon that the gas close to the bottom is high in water content and cannot be thoroughly dried, improving the drying efficiency of the gas, and completing the primary drying operation of the gas.
When the gas initially passing through the first drying mechanism 25 flows to the rightmost side of the outer cylinder 23, the gas flows between the middle cylinder 22 and the inner cylinder 21 through the first gas through holes 221, and then the gas passes through the second drying mechanism 26 again, and the gas is subjected to a deep drying operation of secondary drying by the second gas drying agent in the second drying mechanism 26.
After the gas subjected to the secondary drying treatment flows to the leftmost region between the intermediate cylinder 22 and the inner cylinder 21, it flows into the inner cylinder 21 by the second gas through holes 211.
The middle area of the inner cylinder 21 is a laser channel, after the gas after twice drying treatment flows into the inner cylinder 21, a laser beam is started to perform laser detection, the laser beam is shown by an arrow in fig. 2, a part of the laser beam is absorbed by the gas, and the other part of the laser beam passes through a gas layer and is then detected by a matched photoelectric detector 300, the detector converts a certain proportion of optical signals into electric signals, the electric signals are converted into an analog voltage by a signal processing circuit in a data processing device 400, finally, a digital value called signal intensity is obtained, the size of the digital value is proportional to the size of the gas concentration, and finally, the detected signal intensity digital value can be displayed by a data display device, so that the measurement of the gas concentration can be realized, and the whole measurement process is completed, and the device is convenient and practical.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A laser gas sensor, characterized by: comprises a gas tank (100), a light source module (200), a photoelectric detection module (300) and a data processing module (400);
the light source module (200) is specifically a laser generator for generating a laser beam, and the laser beam generated by the light source module (200) is injected into the gas tank (100) along the axial direction of the gas tank (100);
the gas tank (100) comprises a tank body outer cylinder (1) and a tank body inner core frame (2), wherein the tank body inner core frame (2) is sleeved in the tank body outer cylinder (1), a laser passing channel is arranged on the axis of the tank body outer cylinder (1), an inner cylinder (21), an intermediate cylinder (22) and an outer cylinder (23) are sequentially clamped and fixed in the middle of the tank body inner core frame (2) from inside to outside, the laser passing channel is arranged in the inner cylinder (21), and the laser beam passes through the inner cylinder (21);
a plurality of second drying mechanisms (26) are fixed on the outer side of the inner cylinder (21) at equal intervals, the outer sides of the second drying mechanisms (26) are propped against the inner side of the middle cylinder (22), a plurality of first drying mechanisms (25) are fixed on the outer side of the middle cylinder (22), the outer sides of the first drying mechanisms (25) are propped against the inner side of the outer cylinder (23), at least two first gas through holes (221) are formed in one side, far away from the closed end of the outer cylinder (1), of the middle cylinder (22), and at least two second gas through holes (211) are formed in one side, close to the closed end of the outer cylinder (1), of the inner cylinder (21).
The first drying mechanism (25) is a ring plate which is obliquely and fixedly arranged on the outer side of the middle cylinder (22), two sealing strips are arranged on the outer side edge of the ring plate, one third part of the ring plate is provided with a drying cavity (251) with two communicated sides, the other two thirds part is a solid baffle plate (252), and the drying cavity (251) is filled with a first gas drying agent; two adjacent first drying mechanisms (25) are symmetrically arranged in the middle cylinder (22), and drying cavities (251) on the plurality of first drying mechanisms (25) are arranged in the area between the outer cylinder (23) and the middle cylinder (22) in a staggered manner, so that the channels of gas form a staggered manner;
the photoelectric detection module (300) is specifically a photoelectric detector, and the laser beam passing through the gas tank (100) completes the detection of the light intensity change after passing through the photoelectric detector and converts the light intensity signal into an electric signal;
the data processing module (400) is connected with the photoelectric detection module (300) through signals, and the electric signals output by the photoelectric detection module (300) are collected and then processed to obtain a gas concentration detection result.
2. A laser gas sensor according to claim 1, characterized in that the second drying means (26) is vertically fixed on the outer side of the inner cylinder (21), the second drying means (26) is a net-shaped annular cavity plate, two sealing strips are arranged on the outer side of the annular cavity plate, and a second gas desiccant is filled in the second drying means (26).
3. A laser gas sensor according to claim 1, characterized in that the number of second drying means (26) is not smaller than the number of first drying means (25).
4. The laser gas sensor according to claim 1, wherein a first annular groove (13) and a second annular groove (14) are formed in the inner side of the closed end of the cell outer cylinder (1), sealing strips are fixed at the inner side ends of the middle cylinder (22) and the inner cylinder (21), the sealing strips of the middle cylinder (22) are matched with the first annular groove (13), and the sealing strips of the inner cylinder (21) are matched with the second annular groove (14).
5. A laser gas sensor according to claim 1, characterized in that a plurality of rubber sealing rings (231) are fixed on the outer side of the outer cylinder (23), and the outermost rubber sealing ring (231) is fixed on the outer side edge of the outer cylinder (23), and the rubber sealing ring (231) is used for sealing connection between the outer side of the outer cylinder (23) and the inner side of the cell outer cylinder (1).
6. The laser gas sensor according to claim 1, wherein a rubber connecting sleeve (24) is further fixed on the outer side of the tank body inner core frame (2), the opening end of the tank body outer cylinder (1) is clamped in the rubber connecting sleeve (24), and sealing connection between the tank body outer cylinder (1) and the tank body inner core frame (2) is completed under the action of the rubber connecting sleeve (24).
7. The laser gas sensor according to claim 1, wherein a gas inlet (12) is fixedly connected to one side of the cell outer cylinder (1) close to the closed end of the cell outer cylinder (1).
8. The laser gas sensor according to claim 1, wherein a plurality of third gas through holes (27) are circumferentially formed in an enclosing area of the inner barrel (21) on the cell body inner core frame (2), a gas buffer cavity (28) is formed in an inner cavity of the cell body inner core frame (2), the third gas through holes (27) are communicated with the gas buffer cavity (28) through a gas channel, and a gas outlet (281) communicated with the gas buffer cavity (28) is fixed on the outer side of the cell body inner core frame (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311599224.4A CN117309809B (en) | 2023-11-28 | 2023-11-28 | Laser gas sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311599224.4A CN117309809B (en) | 2023-11-28 | 2023-11-28 | Laser gas sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117309809A true CN117309809A (en) | 2023-12-29 |
| CN117309809B CN117309809B (en) | 2024-01-26 |
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