CN210953786U - High-stability gas measurement chamber and measuring instrument thereof - Google Patents
High-stability gas measurement chamber and measuring instrument thereof Download PDFInfo
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- CN210953786U CN210953786U CN201921429518.1U CN201921429518U CN210953786U CN 210953786 U CN210953786 U CN 210953786U CN 201921429518 U CN201921429518 U CN 201921429518U CN 210953786 U CN210953786 U CN 210953786U
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Abstract
The utility model provides a high stability gas measurement air chamber and measuring apparatu thereof, including vacuum insulation pipe, set up at the inside inner tube of vacuum insulation pipe, inner tube both ends welded inner tube front end flange, inner tube rear end flange, the interior installation collimation lens of inner tube rear end flange, install pyramid prism in the inner tube front end flange, pyramid prism wherein two plane of reflection mutually perpendicular, two planes of reflection of mutually perpendicular equal with the dihedral angle of third plane of reflection, and the intersection line of these two planes of reflection is the acute angle with the contained angle of third plane of reflection. The measuring instrument is provided with a high-stability measuring air chamber. The optical paths of the air chamber and the measuring instrument are insensitive to the deformation of the sampling tube, the stability is very high, and the failure rate of the optical path is reduced. The two filter elements are taken down during installation or debugging and maintenance, so that the light energy entering the spectrometer can be adjusted through the rotary adjusting assembly, the air chamber does not need to be disassembled, and the problem of difficulty in maintaining the heat-humidity ultraviolet flue gas analyzer is completely solved.
Description
Technical Field
The utility model belongs to the technical field of the flue gas detects, concretely relates to high stability gas measurement air chamber and measuring apparatu thereof.
Background
At present, the monitoring of the emission of the flue gas requires measuring SO in the flue gas2、NO、NO2And the concentration of the pollutants can be measured by adopting an ultraviolet absorption method. The ultraviolet absorption method is generally used for measuring the pollutant concentration in the flue gas by a hot wet method and a cold dry method. Wherein the hot wet method does not need dehumidification, and can avoid SO in the condensation process2、NH3The components which are easy to dissolve in water are dissolved and lost, and the air chamber can be arranged in the sampling tube to be designed into a structure integrating the sampling tube and the host machine, so that the portable smoke analyzer is convenient to carry, and is more suitable for portable smoke analyzers. However, in the process of measuring smoke components by a heat-moisture method, the gas chamber is often in the process of repeatedly and alternately changing from the ambient temperature to over 120 ℃, and higher requirements are put forward on the stability of the light path of the gas chamber. The air chamber structure ubiquitous poor shortcoming of stability of current hot wet process flue gas analysis appearance receives the influence of air chamber structure in the great degree of the optical signal that photoelectric sensor received, has slight deformation when the air chamber structure, will cause the light energy of receiving to take place great change, has seriously influenced the reliability of hot wet process flue gas measurement mode. In addition, the air chamber is located in the sampling tube, the defect of high difficulty in the maintenance process is also existed, after the air chamber is required to be detached from the sampling tube, the optical system can be wiped and maintained, and the optical path is required to be readjusted after the completion. Therefore, the current hot wet flue gas analyzer generally has the defects of short maintenance period and high maintenance difficulty.
Chinese patent No.: 201621006601.4, the patent document entitled "measuring gas cell and ultraviolet flue gas analyzer equipped with the same" provides a gas cell for measuring the concentration of flue gas pollutants by thermal and wet methods and an ultraviolet flue gas analyzer equipped with the same. The measurement air chamber adopts Y-shaped branched optical fibers, wherein one optical fiber is connected with a light source and called as a transmitting optical fiber, the other optical fiber is connected with a spectrometer and called as a receiving optical fiber, and a public end is connected with the air chamber. The transmitting optical fiber in the optical fiber connected with the air chamber transmits ultraviolet light, enters the air chamber after passing through the lens, is projected on the reflector at the other end of the air chamber and then reflected back to the lens, is converged by the lens and then reaches the end part of the other optical fiber, and then reaches the spectrometer through the receiving optical fiber. Slight variations in the lens and mirror angles of the structure result in large variations in the light energy returned to the end of the receiving fiber. And the air chamber is often high low temperature alternation, and the instrument is also often carried, especially moves to on the sampling monitoring platform of tens meters height, and the stability of the mechanical structure of air chamber is hardly guaranteed, therefore the needs of portable ultraviolet flue gas sampling can't be satisfied to this scheme.
Chinese patent No.: 201220570891.0, patent document entitled "cube-corner prism-based flue gas analyzer" also provides a flue gas analyzer that measures the concentration of flue gas pollutants using a thermal-wet method. The flue gas analyzer comprises a light source, a spectrometer, Y-shaped optical fibers and an air chamber, wherein three branches of the Y-shaped optical fibers are respectively connected with one ends of the light source, the spectrometer and the air chamber, a collimating lens is installed at one end, connected with the branches of the Y-shaped optical fibers, in the air chamber, a pyramid prism is installed at the other end of the air chamber, and an air inlet and an air outlet are formed in the outer wall of the middle part of the air chamber. The axis of the pyramid prism and the axis of the collimating lens are located on the same straight line. The light path of the structure returns according to the original light path, so that only a small amount of light energy reaches a receiving end, namely a spectrometer, the practical application value is not high, and the requirement of portable ultraviolet smoke sampling cannot be met.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a not enough to prior art, the utility model aims at providing a high stability gas measurement air chamber and measuring apparatu overcomes the unstable influence measurement reliability of light path system that current hot wet flue gas analysis appearance exists to and the difficult scheduling problem is maintained to the analysis appearance.
The utility model provides a high stability gas measurement air chamber, including the vacuum insulation pipe, set up at the inside inner tube of vacuum insulation pipe, inner tube both ends welded inner tube front end flange, inner tube rear end flange, the interior installation collimation lens in the inner tube rear end flange, on prior art's basis, the utility model discloses further make the improvement: the inner tube front end flange is internally provided with a pyramid prism, wherein two reflecting surfaces of the pyramid prism are mutually vertical, the dihedral angles of the two reflecting surfaces which are mutually vertical and the third reflecting surface are equal, and the included angle between the intersection line of the two reflecting surfaces and the third reflecting surface is an acute angle.
The optical fiber is arranged on the air chamber at one end of the collimating lens, incident light emitted from the end part of the transmitting optical fiber becomes parallel light forming an included angle α with a main optical axis of the collimating lens after passing through the collimating lens, and because optical fiber heads of the transmitting optical fiber and the receiving optical fiber are parallel and symmetrical about the main optical axis, the transmitting optical fiber deviates from the main optical axis, and the parallel light of the incident light after passing through the collimating lens forms an included angle α with the main optical axis.
After the parallel light incidence angle cone prism is adopted, emergent light rays after 3 times of total reflection are not parallel to incident light rays, but deflected to a main optical axis by a small angle to return to one end of the collimating lens. The angle of deflection of the reflected light is related to the incident plane of the corner cube that changes the included angle. Through the utility model discloses a design can let the light after pyramid prism reflection just in time converge the receipt optic fibre via collimating lens. In such a light path, the included angle between the light beam reflected back by the incident pyramid prism and the main optical axis is basically only related to the changed included angle of the reflecting surface of the pyramid prism, so that when the installation position and the angle of the pyramid prism are slightly changed, the light energy reflected back to the receiving optical fiber is basically unchanged, and the stability is very high.
Preferably, still include the adjusting part that is used for adjusting the corner cube prism, the adjusting part sets up inside inner tube front end flange, including fixed cylinder, cover, cushion, fixed cylinder has open-ended drum structure for both ends, corner cube prism incident surface one side is pushed up in the inside one end of fixed cylinder, the cushion is withstood on one side of the plane of reflection of corner cube prism, the cover withstands the cushion and is connected with fixed cylinder. During maintenance, for example, the pyramid prism needs to be cleaned, only the barrel cover needs to be unscrewed, the whole adjusting component can be detached, and when the angle of the pyramid prism is adjusted, only the adjusting component needs to be rotated. The utility model discloses pyramid prism's three plane of reflection is no longer mutually perpendicular, and the incident plane refers to the face that light got into pyramid prism, and the emergent face is same face. The reflection surface is a surface on which incident light is reflected. The utility model discloses in, two mutually perpendicular in the 3 plane of reflection to the intersection line and the third plane of reflection of these two planes of reflection are out of plumb, become an acute angle.
Preferably, the other end of the front end flange of the inner pipe is welded with the front end flange of the outer pipe.
Preferably, still include the one-level filter core, the second grade filter core that are used for filtering the flue gas, the second grade filter core sets up in inner tube front end flange, the setting of one-level filter core next to the second grade filter core is in outward appearance front end flange. And secondary filtration is carried out, so that the measurement precision is ensured.
Preferably, the filter element pressing cap is further included, and the filter element pressing cap is pressed against the first-stage filter element and the second-stage filter element to be fixed with the flange at the front end of the outer tube. When the pyramid prism and the wedge-shaped mirror need to be maintained, only the filter element pressing cap needs to be dismounted, and the primary filter element and the secondary filter element are taken out.
Preferably, the collimating lens is fixed by a lens fixing cylinder at a flange at the rear end of the inner tube.
Preferably, the lens fixing device further comprises an optical fiber connector, wherein one end of the optical fiber connector is sleeved outside the lens fixing barrel, and the other end of the optical fiber connector extends out of the vacuum heat insulation pipe.
Preferably, the gas outlet nozzle is further included and is fixed on the flange at the rear end of the inner pipe and communicated with the inside of the inner pipe.
Preferably, an air guide groove is formed in the inner wall of the flange at the front end of the inner pipe and communicated with the inside of the inner pipe.
The utility model also provides a measuring apparatu, foretell high stability gas measurement air chamber is installed to the measuring apparatu.
The utility model has the advantages that:
1. the utility model discloses a light that method transmission fiber end portion sent becomes the parallel light through collimating lens after, as long as can shine on the pyramid prism, can guarantee that the light that returns gets back to and receives the fiber end portion, very big improvement heat wet method optical path system's stability, the air chamber based on this method principle design, the light path of measuring apparatu is insensitive to sampling tube deformation, stability is very high, has reduced the light path fault rate;
2. the two filter elements are taken down during installation or debugging and maintenance, so that the light energy entering the spectrometer can be adjusted through the rotary adjusting assembly, the air chamber does not need to be disassembled, and the problem of difficulty in maintaining the heat-humidity ultraviolet flue gas analyzer is completely solved.
3. When the surface of the optical part is dirty due to contact with smoke and needs to be cleaned, the pyramid incident surface can be cleaned only by taking down the two filter elements and the adjusting component from the front end; the collimating lens can adopt a long rod with absorbent cotton or lens paper at the front end, and is wiped by alcohol, and the collimating lens is assembled according to the original shape after being wiped, and only the received optical signal needs to be adjusted to the required strength through a rotary adjusting component.
Drawings
FIG. 1 is a schematic diagram of the optical path of the method of the present invention,
FIG. 2 is a schematic view of the structure of the air chamber of the present invention,
FIG. 3 is a schematic structural view of the front end flange of the inner tube of the present invention,
FIG. 4 is a schematic structural view of the rear end flange of the inner tube of the present invention,
FIG. 5 is a schematic diagram of the external structure of the measuring instrument of the present invention,
FIG. 6 is a schematic view of the internal structure of the measuring instrument of the present invention,
FIG. 7 is a two-dimensional optical path schematic of the method of the present invention.
The attached drawings are marked as follows:
1. vacuum heat insulation pipe, 2, inner pipe, 3, inner pipe front end flange, 31, air guide groove, 4, inner pipe rear end flange, 41, fastening screw hole, 42, air outlet hole, 5, pyramid prism, 6, collimating lens, 9, adjusting component, 91, fixed cylinder, 92, cylinder cover, 93, rubber pad, 94, first O-shaped ring, 95, second O-shaped ring, 96, prism pressing body, 10, outer pipe front end flange, 11, primary filter core, 12, secondary filtration, 13, filter core pressing cap, 14, primary filter core rubber pad, 15, lens fixed cylinder, 16, optical fiber connector, 18, air chamber, 19, rubber pad, 20, host case, 21, air chamber switching pipe, 22, handle, 23, display screen, 24, power supply interface, 25, data interface, 26, sampling pump, 27, spectrometer, 28, industrial personal computer, 29, pulse xenon lamp, 30, electrochemical sensor component, 31, pump, 32. a condensation dewatering component, 33, a lower computer circuit board.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the scope of the invention.
Examples
Referring to fig. 2, the air chamber of this embodiment includes a vacuum heat insulation pipe 1, an inner pipe 2 disposed inside the vacuum heat insulation pipe 1, an inner pipe front end flange 3 and an inner pipe rear end flange 4 welded to two ends of the inner pipe 2, a pyramid prism 5 installed in the inner pipe front end flange 3, and a collimating lens 6 installed in the inner pipe rear end flange 4, wherein two reflecting surfaces of the pyramid prism 5 are perpendicular to each other, two reflecting surfaces perpendicular to each other are equal to a dihedral angle of a third reflecting surface, and an included angle between an intersection line of the two reflecting surfaces and the third reflecting surface is an acute angle. A Y-shaped optical fiber (not shown) is mounted on the gas cell at one end of the collimator lens 6. The inner pipe front end flange 3 is shown in fig. 3, the inner pipe front end flange 3 is provided with an air guide groove 31, the inner pipe rear end flange 4 is shown in fig. 4, and the inner pipe rear end flange 4 is provided with a fastening screw hole 41 and an air outlet hole 42.
The center distance between the emitting fiber and the receiving fiber of the Y-fiber used in this embodiment is 0.4mm, the focal length of the collimator lens 6 is 20mm, the refractive index of the corner cube 5 is 1.5, and the included angle β of the corner cube 5 in this embodiment is 89.6 ° calculated according to the calculation formula of the included angle β between the intersection line of the two vertical reflecting surfaces of the corner cube 5 and the third reflecting surface.
The intersection line of two vertical reflecting surfaces of the pyramid prism 5 and the included angle β of the third reflecting surface are
Wherein, the hairThe center distance between the transmitting optical fiber and the receiving optical fiber is LFiberThe focal length of the collimating lens is f', and the refractive index of the pyramid prism is nCone。
Referring to fig. 7, the above formula derivation process is: let the center distance between the transmitting optical fiber and the receiving optical fiber be LFiberFocal length of the converging lens is f', and refractive index of the pyramid prism is nConeIn the case where the transmitting optical fiber and the receiving optical fiber are symmetric about the main optical axis, the collimating lens and the main optical axis of the corner cube prism are coaxial, and the incident plane (exit plane) of the corner cube prism is perpendicular to the main optical axis, the opening angle of the centers of the two optical fibers with respect to the center of the collimating lens is:
at this time, the included angle between the light ray emitted from the center of the emitting optical fiber and passing through the optical center of the collimating lens and the main optical axis is as follows:
the light emitted from the center of the emitting optical fiber becomes parallel light after passing through the collimating lens, and the included angles with the main optical axis are all
When parallel light is incident on the incident surface of the corner cube prism, the incident angle is
According to the law of refraction, the angle of refraction is:
the light enters the inside of the pyramid prism and then enters the first reflecting surface, the first reflecting surface is a reflecting surface for reducing the angle theta, on the reflecting surface, the incident angle is increased by theta relative to the angle which is not reduced, the reflected light is increased by 2 theta relative to the angle which is not reduced, other reflecting surfaces are unchanged, and finally the emergent light of the pyramid prism can deflect towards the main optical axis. When the emergent ray and the incident ray of the pyramid prism are symmetrical about the main optical axis, the reflected ray can be just converged to the receiving lens after passing through the collimating lensAnd a fiber take-up. At this time correspond to
The acute angle β of the corner cube is then:
referring to fig. 1, incident light emitted from an end of a Y-type optical fiber emitting optical fiber passes through a collimating lens 6 and then becomes parallel light having an included angle α with a main optical axis of the collimating lens 6, that is, light of a light group a and light of a light group b are parallel to each other and respectively have an included angle α with the main optical axis, in the figure, the light group a and the light group b respectively have two light rays, and since a distance between the light rays is very small, the illustration shows that the light rays coincide, the parallel light still forms an included angle α with the main optical axis of the collimating lens 6 after being reflected by a corner cube 5, the collimating lens 6 and the main optical axis of the corner cube 5 are coaxial, that is, the light group c and the light group d also have an included angle α with the main optical axis, the light group c is light reflected by the light group a, the light group d is light reflected by the light group b, and the light rays of the light group c and the.
The air chamber designed by the method of the embodiment has the advantages that the light path is not affected by slight deformation of the structure of the air chamber, the receiving optical fiber almost converges all the emitted light energy, the measurement precision is very high, and the fault is not easy to occur.
In order to facilitate installation and maintenance of the optical component, as a preferred embodiment of the present embodiment, the air chamber further includes an adjusting assembly 9 for adjusting the corner cube prism 5, referring to fig. 2, the adjusting assembly 9 is disposed inside the inner tube front end flange 3, and includes a fixed cylinder 91, a cylinder cover 92, and a rubber pad 93, the fixed cylinder 91 is a cylindrical structure with openings at two ends, one side of an incident surface of the corner cube prism 5 abuts against one end inside the fixed cylinder 91, one side of a reflection surface of the corner cube prism 5 abuts against the rubber pad 93, and the cylinder cover 92 abuts against the rubber pad 93 and is connected with the fixed cylinder 91.
Further, in order to increase the air tightness of the adjusting assembly 9, referring to fig. 2, the cylinder cover 92 is sleeved with a first O-ring 94 to ensure that the cylinder cover 92 is tightly combined with the fixed cylinder 91. In order to protect the corner cube prism 5, a second O-ring 95 is provided on the contact surface between the corner cube prism 5 and the fixing cylinder 91. A prism presser 96 is further provided on the cylinder cover 92 to prevent the play of the pyramid prism 5.
Referring to fig. 2, the other end of the inner pipe front end flange 3 of the gas cell of this embodiment is welded with an outer pipe front end flange 10. In order to ensure that the flue gas is effectively filtered and the measurement accuracy is ensured, as a preferred embodiment of the present embodiment, the gas chamber further includes a first-stage filter element 11 and a second-stage filter element 12, the second-stage filter element 12 is disposed in the inner tube front end flange 3, and the first-stage filter element 11 is disposed in the outer tube front end flange 10 next to the second-stage filter element 12. The first grade filter core 11 is the stainless steel sintering filter core piece, second grade is filtered 12 and is the polytetrafluoroethylene material filter core.
In order to facilitate the detachment of the primary filter element 11 and the secondary filter element 12, as a preferred embodiment of this embodiment, the air chamber further includes a filter element pressing cap 13, and the filter element pressing cap 13 abuts against the primary filter element 11 and the secondary filter element 12 and is fixed to the outer tube front end flange 10. In order to increase the air tightness of the air chamber, a primary filter element rubber pad 14 can be arranged between the primary filter element 11 and the filter element pressing cap 13. When the pyramid prism 5 needs to be maintained, the filter element pressing cap 13 is only needed to be detached, and the first-stage filter element 11 and the second-stage filter element 12 are taken out, so that the whole air chamber does not need to be detached.
The collimator lens 6 of the present embodiment is fixed to the inner tube rear end flange 4 by the lens fixing cylinder 15. The air chamber of the embodiment further comprises an optical fiber connector 16, wherein one end of the optical fiber connector 16 is sleeved outside the lens fixing barrel 15, and the other end of the optical fiber connector 16 extends out of the vacuum heat insulation pipe 1. The inner tube rear end flange 4 is further provided with an air outlet nozzle (not shown in the figure), and the air outlet nozzle is communicated with an air outlet hole 42 of the inner tube rear end flange 4. The optical fiber connector 16 is fixed by a set screw passing through a set screw hole 41 of the inner pipe rear end flange 4. And a rubber ring 19 is also arranged between the inner pipe rear end flange 4 and the vacuum heat insulation pipe 1.
Referring to fig. 5 and 6, the present embodiment further provides a measuring instrument, the measuring instrument has a main case 20, an air chamber adapter tube 21 is installed on the main case 20, the air chamber adapter tube 21 is connected to the air chamber 18 of the present embodiment, and a handle 22, a display screen 23, a power interface 24, and a data interface 25 are arranged on the main case 20. The mainframe box is internally provided with a sampling pump 26, a spectrometer 27, an industrial personal computer 28, a pulse xenon lamp 29, an electrochemical sensor assembly 30, a peristaltic pump 31, a condensation and water removal assembly 32 and a lower computer circuit board 33. The other structures of the measuring instrument except the air chamber 18 are the prior art, and the connection relationship is not described in detail.
The measuring apparatu during operation of this embodiment, sampling pump 26 work, make the flue gas press cap 13 from the filter core of air chamber tip through one-level filter core 11, the back is filtered to second grade filter core 12 two-stage, air guide groove 31 from inner tube front end flange 3 enters into inner tube 2 in, and air outlet 42 through inner tube rear end flange 4 is from the nozzle exhaust plenum, the nozzle passes through the condensation dewatering component 32 connection in hose and the mainframe box 20, cool water of congealing that condensation dewatering component 32 produced, enter into peristaltic pump 31 through the hose and discharge, flue gas after the dewatering enters into behind the sampling pump 26, the rethread hose enters into electrochemical sensor subassembly 30, discharge through the air duct with electrochemical sensor subassembly 30 intercommunication at last.
Claims (10)
1. The utility model provides a high stability gas measurement air chamber, includes the thermal-insulated pipe of vacuum, sets up at the inside inner tube of thermal-insulated pipe of vacuum, and inner tube both ends welded inner tube front end flange, inner tube rear end flange install collimation lens, its characterized in that in the inner tube rear end flange: the inner tube front end flange is internally provided with a pyramid prism, wherein two reflecting surfaces of the pyramid prism are mutually vertical, the dihedral angles of the two reflecting surfaces which are mutually vertical and the third reflecting surface are equal, and the included angle between the intersection line of the two reflecting surfaces and the third reflecting surface is an acute angle.
2. The high stability gas measurement cell of claim 1, wherein: still include the adjusting part who is used for adjusting pyramid prism, adjusting part sets up inside inner tube front end flange, including solid fixed cylinder, cover, cushion, gu fixed cylinder has open-ended drum structure for both ends, pyramid prism incident plane one side top is at the inside one end of solid fixed cylinder, the cushion is withstood to pyramid prism's plane of reflection one side, the cover withstands the cushion and is connected with solid fixed cylinder.
3. The high stability gas measurement cell of claim 1, wherein: and the other end of the inner pipe front end flange is welded with the outer pipe front end flange.
4. A high stability gas measurement cell according to claim 3, wherein: still include one-level filter core, the second grade filter core that is used for filtering the flue gas, the second grade filter core sets up in inner tube front end flange, the next-door neighbour second grade filter core of one-level filter core sets up in outer tube front end flange.
5. The high stability gas measurement cell of claim 4, wherein: still press the cap including the filter core, the filter core is pressed the cap and is withstood one-level filter core and second grade filter core and outer tube front end flange fixed.
6. The high stability gas measurement cell of claim 1, wherein: and the collimating lens is fixed by the lens fixing barrel at the rear end flange of the inner tube.
7. The high stability gas measurement cell of claim 6, wherein: the lens fixing barrel is characterized by further comprising an optical fiber connector, one end of the optical fiber connector is sleeved outside the lens fixing barrel, and the other end of the optical fiber connector extends out of the vacuum heat insulation pipe.
8. The high stability gas measurement cell of claim 1, wherein: the air outlet nozzle is fixed on the flange at the rear end of the inner tube and communicated with the inside of the inner tube.
9. The high stability gas measurement cell of claim 1, wherein: and an air guide groove is formed in the inner wall of the flange at the front end of the inner pipe and communicated with the inside of the inner pipe.
10. A surveying instrument, characterized by: the measuring instrument is provided with a high-stability gas measuring cell according to any one of claims 1 to 9.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114324173A (en) * | 2022-01-12 | 2022-04-12 | 朗思传感科技(深圳)有限公司 | Gas sensor and probe thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114324173A (en) * | 2022-01-12 | 2022-04-12 | 朗思传感科技(深圳)有限公司 | Gas sensor and probe thereof |
| CN114324173B (en) * | 2022-01-12 | 2024-03-05 | 朗思传感科技(深圳)有限公司 | Gas sensor and probe thereof |
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Address after: 266000 No. 1, Yueyang Road, Chengyang District, Qingdao City, Shandong Patentee after: Qingdao Zhongrui Intelligent Instrument Co.,Ltd. Address before: 266000 No. 1, Yueyang Road, Chengyang District, Qingdao City, Shandong Patentee before: QINGDAO ZHONGRUI INTELLIGENT INSTRUMENT Co.,Ltd. |
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