CN114235711A - Miniaturized portable high-sensitivity gas measurement system - Google Patents
Miniaturized portable high-sensitivity gas measurement system Download PDFInfo
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- CN114235711A CN114235711A CN202210169114.3A CN202210169114A CN114235711A CN 114235711 A CN114235711 A CN 114235711A CN 202210169114 A CN202210169114 A CN 202210169114A CN 114235711 A CN114235711 A CN 114235711A
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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
- G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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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
- G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
- G01N2021/1704—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids in gases
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Abstract
The invention provides a miniaturized portable high-sensitivity gas measuring system which comprises a shell, a gas transmission assembly, a light guide assembly, an acoustic-electric conversion assembly and a main control panel, wherein the gas transmission assembly is connected with the shell and used for transmitting gas to be detected; the light guide assembly is arranged in the shell and connected with the gas transmission assembly, and comprises a first reflection assembly used for changing a light source transmission path; the sound-electricity conversion assembly is connected with the gas transmission assembly and is used for converting sound waves generated in the gas detection process into electric signals; the main control board is arranged in the shell and is simultaneously electrically connected with the gas transmission assembly, the light guide assembly and the sound-electricity conversion assembly. The miniaturized portable high-sensitivity gas measurement system provided by the embodiment of the invention utilizes the photoacoustic spectroscopy technology to realize multi-channel, rapid and accurate measurement of real-time information such as the type, concentration, temperature, pressure and the like of gas, and has the advantages of compact structure, convenience in use and suitability for wide popularization.
Description
Technical Field
The invention relates to the technical field of gas detection, in particular to a miniaturized portable high-sensitivity gas measuring system.
Background
In modern environment, with the emphasis on gas security and the definition of a dual-carbon target. Through professional background knowledge and project experience, a person can know that a plurality of gases with extremely low content and great harm exist in an industrial scene, and meanwhile, an existing instrument is difficult to detect quickly and accurately, so that the great significance of quickly and accurately measuring a plurality of trace gases is deeply realized.
Photoacoustic spectroscopy is a spectroscopic technique based on the photoacoustic effect. The photoacoustic spectroscopy technology is a branch of spectroscopy, and is different from the traditional spectroscopy in that the technology detects not a light signal generated after the interaction of light and gas molecules/atoms, but an acoustic wave signal generated when the energy level of the gas molecules/atoms is converted after absorbing photons, so that the measurement accuracy is greatly improved. In conventional spectroscopy, light scattering, reflection, is the largest interference because the amount of light energy absorbed by a sample is determined by measuring the intensity of the transmitted light and subtracting the difference from the incident light intensity, however, there must be some reflection, scattering, and other losses of light interaction during the test. In contrast, the photoacoustic spectroscopy detects an acoustic signal generated by the absorption of light energy by molecules/atoms, and the intensity of the acoustic signal directly reflects the amount of light energy absorbed by a substance.
In the prior art, the device for detecting gas by photoacoustic spectroscopy has long optical path, large volume and size and is inconvenient to carry; and the accuracy of the test is limited and not sensitive enough.
Disclosure of Invention
To solve the above problems, an object of an embodiment of the present invention is to provide a miniaturized portable high-sensitivity gas measurement system.
The embodiment of the invention provides a miniaturized portable high-sensitivity gas measurement system, which comprises:
a housing comprising an optical base;
the gas transmission assembly is connected with the shell and is used for transmitting gas to be detected;
the light guide assembly is arranged in the shell and is simultaneously connected with the gas transmission assembly and the optical base, the light guide assembly comprises a first reflection assembly, and the first reflection assembly is used for changing a light source transmission path;
the sound-electricity conversion assembly is connected with the gas transmission assembly and is used for converting sound waves generated in the gas detection process into electric signals;
and the main control panel is arranged in the shell, is simultaneously electrically connected with the gas transmission assembly, the light guide assembly and the acoustoelectric conversion assembly and is used for processing the acquired data information and feedback control information.
Preferably, the light guide assembly further comprises:
the laser is connected with the optical base and arranged on one side of the main control board;
the light-focusing assembly is simultaneously connected with the optical base and the reaction cavity, and the light-focusing assembly and the laser are arranged on the same side of the first reflecting assembly;
the concave surface condenser is connected with the optical base and arranged on one side of the reaction cavity, which is far away from the condensing assembly;
the photoelectric detector is connected with the optical base and arranged on one side of the concave surface condenser; the laser, the first reflection assembly, the light condensation assembly, the concave surface light-gathering mirror and the photoelectric detector are arranged around the main control board.
Preferably, the gas delivery assembly comprises:
the air inlet pipe is connected with the shell, penetrates through the shell and is used for acquiring gas to be detected;
the air delivery pump is arranged in the shell and is communicated with the air inlet pipe;
the reaction cavity is connected with the light guide assembly and communicated with the air inlet pipe, and the transmission direction of light rays in the reaction cavity is vertical to the transmission direction of light rays received by the photoelectric detector;
the gas outlet pipe is communicated with the reaction cavity, penetrates through the shell and is used for discharging detected gas;
the wire fixing device is simultaneously connected with the air inlet pipe, the air outlet pipe and the shell and used for limiting the positions of the air inlet pipe and the air outlet pipe.
Preferably, the light condensing assembly includes:
the cage-type system fixing seat is connected with the optical base and arranged on one side of the first reflecting assembly, and a light passing hole is formed in the cage-type system fixing seat;
the support slide rail is simultaneously connected with the cage system fixing seat and the reaction cavity;
the two-dimensional adjusting platform is connected with the supporting slide rail in a sliding mode, and a mounting hole which is on the same axis with the light passing hole is formed in the two-dimensional adjusting platform;
the condensing lens is arranged in the mounting hole;
and the adjusting assembly is simultaneously connected with the condensing lens and the two-dimensional adjusting platform and is used for adjusting the position of the condensing lens.
Preferably, the acoustic-electric conversion assembly includes:
the tuning fork and the resonance tube mounting base are connected with the reaction cavity;
the tuning fork is connected with the tuning fork and the resonance tube mounting base and is arranged in the reaction cavity;
the resonance tube is connected with the tuning fork and the resonance tube mounting base and is arranged on one side of the tuning fork, which is far away from the tuning fork and the resonance tube mounting base;
the preamplifier is connected with the tuning fork and the resonance tube mounting base and is electrically connected with the main control board, and the tuning fork penetrates through the tuning fork and the resonance tube mounting base and is connected with the preamplifier;
and the reaction cavity sealing cover is simultaneously connected with the preamplifier, the tuning fork and the resonance tube mounting seat and is used for fixing the preamplifier.
Preferably, the housing further comprises:
the base is simultaneously connected with the gas transmission assembly, the light guide assembly and the sound-electricity conversion assembly, a plurality of supporting foot pads are arranged on the base, a first heat dissipation opening is further arranged on the base, and the first heat dissipation opening is of an annular hole-shaped structure;
the side wall baffle is connected with the base and the wire fixing device, the air inlet pipe and the air outlet pipe are both attached to the inner wall of the side wall baffle, a second heat dissipation port is arranged on the side wall baffle, the second heat dissipation port is of a plurality of rectangular hole-shaped structures which are arranged side by side, an air inlet connected with the air inlet pipe and an air outlet connected with the air outlet pipe are also arranged on the side wall baffle, and the air inlet is arranged adjacent to the air outlet;
the top cover is detachably connected with the side wall.
Preferably, the miniaturized portable high-sensitivity gas measurement system further comprises:
the heat dissipation assembly is connected with the shell and arranged around the main control board;
the temperature main control board is arranged in the shell, is electrically connected with the main control board and is used for controlling the temperature of the laser;
the current main control board is simultaneously electrically connected with the main control board and the laser and is used for controlling the working current of the laser;
and the reference gas cavity is connected with the optical base and is arranged between the reaction cavity and the concave surface condenser.
Preferably, the heat dissipation assembly includes:
the circuit board radiator is arranged on one side of the main control board and used for radiating the main control board, the temperature main control board and the current main control board;
the light source cooling fin is arranged on one side of the laser and used for cooling the laser, and the light source cooling fin comprises a heat conduction copper strip connected with the laser, a cooling fin connected with the heat conduction copper strip and a cooling fan arranged on one side of the cooling fin.
Preferably, the side wall baffle is further provided with a plurality of indicator lights, a plurality of control switches and a plurality of interfaces, and the plurality of indicator lights are respectively used for indicating the working conditions of each stage; the control switches are respectively used for controlling the on-off of the work of each stage; and the plurality of interfaces are used for being connected with external equipment.
Preferably, the first reflection assembly includes:
the first reflective mirror is connected with the shell and arranged on one side of the laser, and an included angle between the arrangement direction of the first reflective mirror and the light emitted by the laser is 45 degrees;
the second reflector is connected with the shell and arranged on one side of the cage system fixing seat, the second reflector is perpendicular to the first reflector, and the center of the second reflector is located on the axis of the light passing hole.
The scheme provided by the embodiment of the invention is a miniaturized portable high-sensitivity photoacoustic spectrometry gas measuring system, and real-time information such as the type, concentration, temperature, pressure and the like of gas can be rapidly and accurately tested in a multi-channel manner by utilizing a photoacoustic spectrometry technology. The device changes the transmission direction of light through the first reflection assembly, shortens the linear occupied space of the light guide assembly on the premise of ensuring the light transmission effect, and reduces the optical path of the equipment, thereby effectively reducing the overall volume of the equipment and being convenient to carry and use; through the setting of acoustoelectric conversion subassembly, adopt optoacoustic spectroscopy technique, improve gas detection's measuring accuracy and sensitivity, detection effect is better. The device solves the problems of long optical path, large volume and size and inconvenience in carrying of the prior art; and the testing precision is limited and not sensitive enough, the effect is obvious, and the method is suitable for wide popularization.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of the internal structure of a housing of a miniaturized portable high-sensitivity gas measurement system provided by an embodiment of the invention;
FIG. 2 is a schematic diagram of a housing of a miniaturized portable high-sensitivity gas measurement system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a miniaturized portable high-sensitivity gas measurement system according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating a light guide assembly of a miniaturized portable high-sensitivity gas measurement system according to an embodiment of the present invention;
fig. 5 shows a schematic structural diagram of an acoustic-electric conversion assembly of a miniaturized portable high-sensitivity gas measurement system provided by an embodiment of the invention.
Icon:
1. a base; 2. a support pillar; 3. a circuit board heat sink; 4. a main control panel; 5. a temperature main control panel; 6. a heat sink; 7. a thermally conductive copper bar; 8. a heat-conducting copper bar pressing plate; 9. a side dam; 10. an air delivery pump; 11. a DC power plug; 12. a power switch; 13. a quick connector cage system fixing seat; 14. a heat radiation fan; 15. a photoelectric detection output port; 16. a photodetection input port; 17. a programming interface; 18. a pre-preamplifier interface; 19. a first reflective mirror; 20. a wire fixing device; 21. an air outlet pipe; 22. a vent; 23. a second reflective mirror; 24. a laser; 25. a cage system fixing seat; 26. a two-dimensional adjusting table; 27. supporting the slide rail; 28. a reaction chamber sealing cover; 29. a tuning fork and a resonance tube mounting base; 30. a reaction chamber; 31. a current main control board; 32. a reference gas chamber; 33. a concave condenser; 34. a USB interface; 35. a gas flow adjustment knob; 36. an optical base; 37. a photodetector; 38. a photodetector platen; 39. a power distribution board; 40. a front baffle; 41. a laser enable switch; 42. a system master switch; 43. a laser enable indicator light; 44. a system indicator light; 45. an air pump working indicator light; 46. a first heat dissipation port; 47. supporting the foot pad; 48. a second heat dissipation port; 49. a top cover; 50. an air inlet; 51. an air outlet; 52. pressing a laser plate; 53. fixing the snap ring; 54. a window sheet; 55. a resonance tube; 56. an adjusting frame; 57. a tuning fork; 58. an O-shaped sealing ring; 59. a preamplifier.
Detailed Description
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" 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" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be 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 meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1 to 5, an embodiment of a miniaturized portable high-sensitivity gas measurement system according to the present invention will be described. The miniaturized portable high-sensitivity gas measuring system comprises a shell, a gas transmission assembly, a light guide assembly, an acoustic-electric conversion assembly and a main control panel 4, wherein the shell comprises an optical base 36; the gas transmission assembly is connected with the shell and used for transmitting gas to be detected; the light guide assembly is arranged in the shell and is simultaneously connected with the gas transmission assembly and the optical base 36, and the light guide assembly comprises a first reflection assembly which is used for changing a light source transmission path; the sound-electricity conversion assembly is connected with the gas transmission assembly and is used for converting sound waves generated in the gas detection process into electric signals; the main control panel 4 is arranged in the shell, and the main control panel 4 is simultaneously electrically connected with the gas transmission assembly, the light guide assembly and the sound-electricity conversion assembly and is used for processing the acquired data information and feedback control information.
Compared with the prior art, the miniaturized portable high-sensitivity gas measurement system designs a large-size principle model of a scientific research level into miniaturized and portable mass-producible equipment. The ultra-high-sensitivity gas detection is realized by utilizing a photoacoustic spectroscopy technology, wherein an infrared semiconductor laser with stable wavelength power is used as a detection light source, a high-sensitivity quartz tuning fork is used for manufacturing a detection module, various ultra-low concentration gas components can be detected by installing corresponding light sources, and the minimum detection limit concentration reaches the ppb (part per billion) level. The transmission direction of light is changed through the first reflection assembly, so that the linear occupied space of the light guide assembly is shortened on the premise of ensuring the light transmission effect, and the optical path of the equipment is reduced, so that the overall volume of the equipment is effectively reduced, and the equipment is convenient to carry and use; through the setting of acoustoelectric conversion subassembly, adopt optoacoustic spectroscopy technique, improve gas detection's measuring accuracy and sensitivity, detection effect is better. The device solves the problems of long optical path, large volume and size and inconvenience in carrying of the prior art; and the testing precision is limited and not sensitive enough, the effect is obvious, and the method is suitable for wide popularization.
As another embodiment of the present invention, the structure of the miniaturized portable high-sensitivity gas measurement system is substantially the same as that in the above embodiment, except that the gas transmission assembly comprises a gas inlet pipe, a gas transmission pump 10, a reaction chamber 30, a gas outlet pipe 21 and a wire fixing device 20, wherein the gas inlet pipe is connected with the housing and penetrates through the housing to obtain the gas to be detected; the air delivery pump 10 is arranged in the shell and is communicated with the air inlet pipe; the reaction cavity 30 is connected with the light guide assembly and communicated with the air inlet pipe; the gas outlet pipe 21 is communicated with the reaction cavity 30, penetrates through the shell and is used for discharging detected gas; the thread fixing device 20 is connected with the air inlet pipe, the air outlet pipe 21 and the shell at the same time and used for limiting the positions of the air inlet pipe and the air outlet pipe 21.
In this embodiment, the air pump 10 may be a membrane air pump. The reaction chamber 30 is provided with two window sheets 54, the two window sheets 54 are arranged on two opposite surfaces of the reaction chamber 30, the window sheets 54 are fixedly connected with the reaction chamber 30 through a fixing clamp ring 53, and one window sheet 54 is matched with the light-focusing assembly and used for enabling light rays focused by the light-focusing assembly to penetrate into the reaction chamber 30 to react with gas; the other window piece 54 is adapted to the concave condenser 33, and is used for transmitting the reflected light in the reaction chamber 30 to the concave condenser 33, so as to facilitate the acquisition of the light data after the subsequent reaction.
As another embodiment of the present invention, the structure of the miniaturized portable high-sensitivity gas measurement system is substantially the same as that of the above-mentioned embodiment, except that the light guide assembly further comprises a laser 24, a light focusing assembly, a concave light focusing mirror 33 and a photodetector 37, wherein the laser 24 is connected with the optical base 36 and is disposed on one side of the main control board 4; the light-focusing component is connected with the optical base 36 and the reaction cavity 30 at the same time, and the light-focusing component and the laser 24 are arranged on the same side of the first reflection component; the concave condenser 33 is connected with the optical base 36 and is arranged at one side of the reaction cavity 30 far away from the condensing assembly; the photoelectric detector 37 is connected with the optical base 36 and is arranged on one side of the concave condenser 33, and the light transmission direction received by the photoelectric detector 37 is vertical to the light transmission direction in the reaction cavity 30; the laser 24, the first reflection assembly, the light condensing assembly, the reaction chamber 30, the concave condenser lens 33 and the photodetector 37 are disposed around the main control board 4.
In the present embodiment, the light transmission direction of the light-focusing assembly is parallel to the light emission direction of the laser 24. The laser 24 may be a QCL laser; the optical base 36 is used for fixing and integrally adjusting the concave condenser 33 and the photoelectric detector 37, and is convenient to use; the photoelectric detector 37 is fixed on the optical base 36 through the photoelectric detector pressing plate 38, and the structure is simple and convenient to assemble and disassemble. The concave condenser 33 includes a dioptric support and a mirror.
In this embodiment, laser 24 is fixedly coupled to optical base 36 by laser clamp plate 52. The laser 24 itself has four screw fixing holes, which are distributed in a rectangular shape at four corners of the laser 24. Because three heat conducting copper strips 7 are used for transferring heat to the radiating fins 6 for the laser 24, the heat conducting copper strips 7 are arranged below the laser 24 and can shield two fixing holes in the laser 24, so that the laser pressing plate 52 is arranged to press one end of the laser 24, and the other end of the laser pressing plate is fixed by screws, and the stable installation of the laser 24 can be effectively ensured.
In this embodiment, optical base 36 is designed integrally after calculating the optical path of the system, so as to minimize the risk of errors caused by the connection between the components. The parts related to optics in the light guide assembly are fixed on the optical base 36, and the purpose of arranging the optical base 36 is to provide a uniform reference platform, so that the accuracy of the light path and the fine adjustment of the light path at the later stage are facilitated. If each optical component is installed dispersedly, there is a large error, and the adjustment is inconvenient. The optical base 36 is integrally machined by adopting a high-quality aluminum alloy material, so that the later-stage assembly and maintenance cost is simplified while the precision is ensured. Meanwhile, in a place where the optical path adjustment freedom degree needs to be reserved, a high-precision adjusting frame scheme is adopted (namely, the first reflective mirror 19, the second reflective mirror 23, the two-dimensional adjusting table 26 and the concave collecting mirror 33 all adopt high-precision adjusting frame structures, the high-precision adjusting frame scheme is the prior art, and is not described too much), and the stability of the optical-mechanical component after the adjustment and the fixation are ensured.
As another embodiment of the present invention, the structure of the miniaturized portable high-sensitivity gas measurement system is substantially the same as that in the above embodiment, except that the light-gathering component includes a cage-type system fixing base 25, a supporting slide rail 27, a two-dimensional adjusting platform 26, a light-gathering lens and an adjusting component, wherein the cage-type system fixing base 25 is connected with the optical base 36 and is disposed at one side of the first reflection component, and the cage-type system fixing base 25 is provided with a light-passing hole; the support slide rail 27 is simultaneously connected with the cage system fixing seat 25 and the reaction chamber 30; the two-dimensional adjusting platform 26 is connected with the supporting slide rail 27 in a sliding manner, and a mounting hole which is on the same axis with the light passing hole is formed in the two-dimensional adjusting platform 26; the condensing lens is arranged in the mounting hole; the adjustment assembly is also connected to the condenser lens and to a two-dimensional adjustment stage 26 for adjusting the position of the condenser lens.
Two-dimensional adjusting station 26 and adjusting part constitute lens two-dimensional platform jointly, can carry out the adjustment of position to condensing lens on the two-dimensional direction, support slide rail 27 can be cage system slide bar, including four slide bars promptly, four two liang of slide bars set up side by side, constitute the rectangle structure, two-dimensional adjusting station 26 is the rectangular block, the four corners department of rectangular block all is equipped with the slide opening that is used for the slide bar to pass through, two-dimensional adjusting station 26 slides on the slide bar, realize condensing lens position's adjustment on three-dimensional space, the transmission of different grade type light can be adapted to in the adjustment through condensing lens, accommodation is wider. Cage system mounting 25 provides one end support for support rail 27, ensuring stability of support rail 27. The condensing lens is a plano-convex lens, the two-dimensional platform of the lens is a fixing frame of the plano-convex lens, the fixing frame plays a role in fixing the plano-convex lens, the adjusting components are two fine adjusting knobs which are perpendicular to each other, the position of the plano-convex lens can be finely adjusted in a fine stepping mode on the XY two shafts, and therefore light beams can smoothly penetrate through the resonance tube 55. The two-dimensional stage slides on the support rail 27 to adjust the focus of the plano-convex lens and secure the focus at the center of the resonance tube 55.
As another embodiment of the present invention, the structure of the miniaturized portable high-sensitivity gas measuring system is substantially the same as that of the above-described embodiment, except that the acoustic-electric conversion assembly includes a tuning fork and resonance tube mount 29, a tuning fork 57, a resonance tube 55, a preamplifier 59, and a reaction chamber cover 28, wherein the tuning fork and resonance tube mount 29 is connected to the reaction chamber 30; the tuning fork 57 is connected with the tuning fork and the resonance tube mounting base 29 and is arranged in the reaction chamber 30; the resonance tube 55 is connected with the tuning fork and the resonance tube mounting seat 29 and is arranged on one side of the tuning fork 57 away from the tuning fork and the resonance tube mounting seat 29; the preamplifier 59 is connected with the tuning fork and the resonance tube mounting base 29 and is electrically connected with the main control board 4, and the tuning fork 57 penetrates through the tuning fork and the resonance tube mounting base 29 and is connected with the preamplifier 59; the reaction chamber lid 28 is connected to the preamplifier 59 and the tuning fork and resonance tube mounting base 29, and fixes the preamplifier 59.
In this embodiment, the groove on the tuning fork 57 is named as a tuning slot, and the resonance tube 55 is disposed in the tuning slot, i.e., disposed through the tuning fork 57; the resonance tube 55 is disposed on a transmission path of light and is disposed perpendicular to the tuning fork 57. The tuning fork 57 may be a quartz tuning fork. The resonance tube 55 is mounted on the tuning fork and the resonance tube mounting base 29 via an adjusting bracket 56, and the adjusting bracket 56 has an L-shaped structure. An O-shaped sealing ring 58 is arranged between the tuning fork and the resonance tube mounting seat 29 and the reaction cavity 30, and the tuning fork and the resonance tube mounting seat 29 are fixed with the reaction cavity 30 through screws, so that the O-shaped sealing ring 58 is used for ensuring the sealing performance between the tuning fork and the resonance tube mounting seat 29 and the reaction cavity 30, and ensuring that the reaction cavity 30 cannot leak air in the detection process.
As another embodiment of the present invention, the structure of the miniaturized portable high-sensitivity gas measurement system is substantially the same as that in the above embodiment, and the difference is that the housing further includes a base 1, a side enclosure and a top cover 49, wherein the base 1 is simultaneously connected with the gas transmission assembly, the light guide assembly and the sound-electricity conversion assembly, the base 1 is provided with a plurality of supporting foot pads 47, the base 1 is further provided with a first heat dissipation port 46, and the first heat dissipation port 46 is an annular hole-shaped structure; the side wall baffle is simultaneously connected with the base 1 and the wire fixing device 20, the air inlet pipe and the air outlet pipe 21 are both attached to the inner wall of the side wall baffle, a second heat dissipation port 48 is arranged on the side wall baffle, the second heat dissipation ports 48 are of a plurality of rectangular hole-shaped structures which are arranged side by side, an air inlet 50 connected with the air inlet pipe and an air outlet 51 connected with the air outlet pipe 21 are also arranged on the side wall baffle, and the air inlet 50 and the air outlet 51 are arranged adjacently; the top cover 49 is detachably connected with the side wall.
In the embodiment, the side wall comprises a front baffle 40, a rear baffle and two side baffles 9, wherein the front baffle 40 is arranged opposite to the rear baffle, and the two side baffles 9 are arranged between the front baffle 40 and the rear baffle; the air inlet 50 and the air outlet 51 are both arranged on the rear baffle plate; the second heat dissipation openings 48 are provided in plurality and are respectively provided on the two side baffles 9 and the front baffle 40, such as the ventilation openings 22 on the side baffles 9 shown in fig. 1.
As another embodiment of the present invention, the structure of the miniaturized portable high-sensitivity gas measurement system is substantially the same as that of the above-mentioned embodiment, except that the miniaturized portable high-sensitivity gas measurement system further comprises a heat dissipation assembly, a temperature main control board 5, a current main control board 31 and a reference gas cavity 32, wherein the heat dissipation assembly is connected with the housing and is arranged around the main control board 4; the temperature main control board 5 is arranged in the shell, is electrically connected with the main control board 4 and is used for controlling the temperature in the shell; the current main control board 31 is electrically connected with the main control board 4 and the laser 24 at the same time and is used for controlling the working current of the laser 24; the reference gas cavity 32 is connected to the optical bench 36 and is disposed between the reaction chamber 30 and the concave condenser.
As another embodiment of the present invention, the structure of the miniaturized portable high-sensitivity gas measurement system is substantially the same as that of the above-described embodiment, except that the heat dissipation assembly includes a circuit board heat sink 3 and a light source heat sink, wherein the circuit board heat sink 3 is disposed at one side of the main control board 4 for dissipating heat of the main control board 4, the temperature main control board 5 and the current main control board 31, the main control board 4 is mounted on the circuit board heat sink 3, and the circuit board heat sink 3 is mounted on the base 1; the light source cooling fin is arranged on one side of the laser 24 and used for cooling the laser 24, and comprises a heat conduction copper strip 7 connected with the laser 24, a cooling fin 6 connected with the heat conduction copper strip 7 and a cooling fan 14 arranged on one side of the cooling fin 6.
In the present embodiment, the arrangement direction of the heat conducting copper bars 7 is perpendicular to the arrangement direction of the supporting slide rails 27; the heat sink 6 is disposed at one end of the heat conducting copper bar 7, and the laser 24 is disposed at the other end of the heat conducting copper bar 7. The heat sink 6 is a laser radiator. The heat conducting copper strip 7 is fixed on the radiating fin 6 through a heat conducting copper strip pressing plate 8. The circuit board radiator 3 is connected with the shell through the supporting columns 2, and the circuit board radiator 3 is used for conducting heat dissipation treatment on the main control board 4 and providing a good working environment for the main control board 4.
As another embodiment of the present invention, the structure of the miniaturized portable high-sensitivity gas measurement system is basically the same as that in the above embodiment, but the difference is that a plurality of indicator lights, a plurality of control switches and a plurality of interfaces are further arranged on the side wall barrier, and the plurality of indicator lights are respectively used for indicating the working conditions of each stage; the control switches are respectively used for controlling the on-off of the work of each stage; and the interfaces are used for connecting with external equipment.
In this embodiment, a control knob, such as an air flow adjusting knob 35 for controlling the air flow, is provided on the front baffle 40, and a control switch and an indicator lamp are also provided on the front baffle 40, the control switch includes a laser enable switch 41 and a system main switch 42, and the indicator lamp includes a laser enable indicator lamp 43, a system indicator lamp 44 and an air pump operation indicator lamp 45; the rear baffle plate is also provided with a DC power plug 11, a power switch 12 and a quick connector cage system fixing seat 13, an interface for connecting with an external plug-in is arranged on the rear baffle plate, external equipment connected on the interface is replaceable, and the interface comprises a USB interface 34, a photoelectric detection output port 15, a photoelectric detection input port 16, a programming interface 17 and a preamplifier interface 18. All structures in the system are designed independently, are matched with each other, have respective functions, can have slight changes in shape on the premise of not influencing the functions of the structures, and are not subjected to excessive constraint.
As another embodiment of the present invention, the structure of the miniaturized portable high-sensitivity gas measurement system is basically the same as that in the above-mentioned embodiment, and the difference is that the first reflection assembly includes a first reflective mirror 19 and a second reflective mirror 23, wherein the first reflective mirror 19 is connected with the housing and is disposed at one side of the laser 24, and an included angle between the direction in which the first reflective mirror 19 is disposed and the light emitted by the laser 24 is 45 degrees; the second reflecting mirror 23 is connected with the shell and arranged on one side of the cage system fixing seat 25, the second reflecting mirror 23 is perpendicular to the first reflecting mirror 19, and the center of the second reflecting mirror 23 is located on the axis of the light passing hole.
As another embodiment of the present invention, the structure of the miniaturized portable high-sensitivity gas measurement system is substantially the same as that in the above embodiment, except that the apparatus further includes a power distribution board 39, and the power distribution board 39 includes an external power supply main interface, a main board power supply interface, an air pump power supply interface, a cooling fan power supply interface X6, a laser control board power supply interface, a USB interface 34, an air pump operation indicator 45, a system indicator 44, a laser enable indicator 43, a laser temperature control board power supply interface, and a DCDC module.
In the present embodiment, a very small cavity design is adopted, that is, the effective gas capacity inside the reaction cavity 30 is less than 2ml, and exemplarily, the capacity may be 1.7 ± 0.05 ml; the gas transmission pump 10 adopts a high-performance gas pump, and the gas flow can reach 1500ml/min, so that the updating rate of a system sample can be ensured, the real-time property and the dynamic reaction speed of gas detection are ensured, and the problems that the gas in the cavity is not updated timely due to the small sample amount required by gas detection and the adoption of the large-volume reaction cavity 30, and the real-time property of the system is reduced are solved.
Gas detection principle: the gas sample is pumped into the reaction cavity 30 through the gas inlet pipe by the gas transmission pump 10 and circularly flows through the gas outlet pipe 21; the laser 24 emits a laser beam, after the first reflective mirror 19 and the second reflective mirror 23 finely adjust the path of the light path, the light beam is converged by a plano-convex lens arranged on a two-dimensional adjusting table 26, passes through a window sheet 54 and enters the reaction chamber 30, and the convergence point of the light beam is adjusted at the central position of the resonance tube 55 through a light-converging component; the light beam passes through the window plate 54 after exiting the resonance tube 55 and then exits the reaction chamber 30, and then hits the concave mirror of the concave condenser 33 and then converges on the photodetector 37. The gas detection mechanism can be summarized as follows: the laser photons with specific wavelength generate physical reaction with gas molecules to be detected in the reaction cavity 30, the gas molecules can form weak acoustic signals in the process of absorbing and releasing the photons, the acoustic signals are amplified by the resonance tube 55 and then transmitted out through small holes in the wall of the resonance tube 55 to further stimulate the quartz tuning fork with specific frequency, the quartz tuning fork converts the weak acoustic signals into weak electric signals through the piezoelectric effect, the electric signals are amplified by the primary preamplifier and then sent to an analog-to-digital conversion interface of the main board, and data processing and data analysis are performed in the next step after analog-to-digital conversion.
Compared with the prior art, the miniaturized portable high-sensitivity gas measurement system has the key point that the miniaturization can be realized: one, unique optical structure design: traditional spectrum detection experiment systems are all built by purchasing optical devices of third parties, and cannot be compressed in the occupied area and the vertical height of the system, so that the system is not integrated. The invention ensures the quality of the provided light beam from the heat dissipation structure of the laser, the structure of the flattened cage-type light-gathering component to the structure of the reaction chamber 30, shortens the optical path through the structural arrangement, ensures the centralized arrangement of each component, and effectively reduces the whole volume of the equipment. Second, circuit board independently researched and developed: the traditional spectrum detection experiment system, no matter from power supply, data acquisition and analysis, all needs to rely on the mature product of third party, can't integrate to the system. The invention improves the power supply board and the data acquisition and analysis main board, so that the area of the circuit board is very small, the shape of the circuit board is customized according to the mechanical structure of the system, and the integration and miniaturization design of the system are more convenient. The device realizes the miniaturization of equipment through device model selection, overall layout, heat dissipation, light path design and the like, and is convenient to carry; the precise light path design is adopted to realize the stability and reliability of the test light source; the rigorous detection module design ensures that the data of the gas to be detected is accurately detected and output; and designing and manufacturing a high-precision reference module.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present invention, and the present invention shall be covered by the claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A miniaturized portable high-sensitivity gas measurement system, comprising:
a housing including an optical base (36);
the gas transmission assembly is connected with the shell and is used for transmitting gas to be detected;
the light guide assembly is arranged in the shell and is simultaneously connected with the gas transmission assembly and the optical base (36), the light guide assembly comprises a first reflection assembly, and the first reflection assembly is used for changing a light source transmission path;
the sound-electricity conversion assembly is connected with the gas transmission assembly and is used for converting sound waves generated in the gas detection process into electric signals;
the main control panel (4) is arranged in the shell, and the main control panel (4) is simultaneously electrically connected with the gas transmission assembly, the light guide assembly and the sound-electricity conversion assembly and used for processing the acquired data information and feedback control information.
2. A miniaturized portable high sensitivity gas measurement system according to claim 1, wherein said light guide assembly further comprises:
a laser (24) connected to the optical base (36) and disposed on one side of the main control board (4);
the light-focusing component is connected with the optical base (36) and the gas transmission component at the same time, and the light-focusing component and the laser (24) are arranged on the same side of the first reflection component;
the concave condenser lens (33) is connected with the optical base (36) and is arranged on one side, away from the light gathering component, of the gas transmission component;
a photodetector (37) connected to the optical base (36) and disposed on one side of the concave condenser (33); the laser (24), the first reflection assembly, the light condensing assembly, the concave light condensing lens (33) and the photoelectric detector (37) are arranged around the main control board (4).
3. A miniaturized portable high sensitivity gas measurement system according to claim 2, wherein said gas delivery module comprises:
the air inlet pipe is connected with the shell, penetrates through the shell and is used for acquiring gas to be detected;
the air delivery pump (10) is arranged in the shell and is communicated with the air inlet pipe;
the reaction cavity (30) is connected with the light guide assembly and communicated with the air inlet pipe, and the transmission direction of light rays in the reaction cavity (30) is vertical to the transmission direction of light rays received by the photoelectric detector (37);
the gas outlet pipe (21) is communicated with the reaction cavity (30), penetrates through the shell and is used for discharging detected gas;
the wire fixing device (20) is connected with the air inlet pipe, the air outlet pipe (21) and the shell and used for limiting the positions of the air inlet pipe and the air outlet pipe (21).
4. A miniaturized portable high sensitivity gas measurement system according to claim 3, wherein said light focusing assembly comprises:
the cage-type system fixing seat (25) is connected with the optical base (36) and arranged on one side of the first reflection assembly, and a light passing hole is formed in the cage-type system fixing seat (25);
the support slide rails (27) are simultaneously connected with the cage system fixing seats (25) and the reaction chamber (30);
the two-dimensional adjusting platform (26) is connected with the supporting slide rail (27) in a sliding mode, and a mounting hole which is on the same axis with the light passing hole is formed in the two-dimensional adjusting platform (26);
the condensing lens is arranged in the mounting hole;
and the adjusting assembly is connected with the condensing lens and the two-dimensional adjusting platform (26) and is used for adjusting the position of the condensing lens.
5. A miniaturized portable high sensitivity gas measurement system according to claim 4 wherein said acousto-electric conversion assembly comprises:
a tuning fork and resonance tube mounting base (29) connected to the reaction chamber (30);
a tuning fork (57) connected to the tuning fork and the resonance tube mounting base (29) and disposed in the reaction chamber (30);
the resonance tube (55) is connected with the tuning fork and the resonance tube mounting seat (29) and is arranged on one side, away from the tuning fork and the resonance tube mounting seat (29), of the tuning fork (57);
a preamplifier (59) connected to the tuning fork and the resonance tube mounting base (29) and electrically connected to the main control board (4), wherein the tuning fork (57) penetrates through the tuning fork and the resonance tube mounting base (29) and is connected to the preamplifier (59);
and the reaction cavity cover (28) is simultaneously connected with the preamplifier (59) and the tuning fork and resonance tube mounting seat (29) and is used for fixing the preamplifier (59).
6. A miniaturized portable high sensitivity gas measurement system according to claim 5, wherein said housing further comprises:
the base (1) is simultaneously connected with the gas transmission assembly, the light guide assembly and the sound-electricity conversion assembly, a plurality of supporting foot pads (47) are arranged on the base (1), a first heat dissipation opening (46) is further arranged on the base (1), and the first heat dissipation opening (46) is of an annular hole-shaped structure;
the side fence is connected with the base (1) and the wire fixing device (20) at the same time, the air inlet pipe and the air outlet pipe (21) are both attached to the inner wall of the side fence, a second heat dissipation opening (48) is formed in the side fence, the second heat dissipation openings (48) are of a plurality of rectangular hole-shaped structures arranged side by side, an air inlet (50) connected with the air inlet pipe and an air outlet (51) connected with the air outlet pipe (21) are further formed in the side fence, and the air inlet (50) and the air outlet (51) are arranged adjacently;
and the top cover (49) is detachably connected with the side wall.
7. A miniaturized portable high sensitivity gas measurement system according to claim 6, further comprising:
the heat dissipation assembly is connected with the shell and is arranged around the main control panel (4);
the temperature main control board (5) is arranged in the shell, is electrically connected with the main control board (4) and is used for controlling the temperature of the laser;
the current main control board (31) is electrically connected with the main control board (4) and the laser (24) at the same time and is used for controlling the working current of the laser (24);
and the reference gas cavity (32) is connected with the optical base (36) and is arranged between the reaction cavity (30) and the concave surface condenser (33).
8. A miniaturized portable high sensitivity gas measurement system according to claim 7, wherein said heat sink assembly comprises:
the circuit board radiator (3) is arranged on one side of the main control board (4) and used for radiating the main control board (4), the temperature main control board (5) and the current main control board (31);
the light source cooling fin is arranged on one side of the laser (24) and used for cooling the laser (24), and the light source cooling fin comprises a heat conduction copper bar (7) connected with the laser (24), a cooling fin (6) connected with the heat conduction copper bar (7) and a cooling fan (14) arranged on one side of the cooling fin (6).
9. The miniaturized portable high-sensitivity gas measurement system according to claim 8, wherein a plurality of indicator lights, a plurality of control switches and a plurality of interfaces are further arranged on the side wall shield, and the plurality of indicator lights are respectively used for indicating the working conditions of each stage; the control switches are respectively used for controlling the on-off of the work of each stage; and the plurality of interfaces are used for being connected with external equipment.
10. A miniaturized portable high sensitivity gas measurement system according to claim 9 wherein said first reflection assembly comprises:
the first reflective mirror (19) is connected with the shell and arranged on one side of the laser (24), and an included angle between the arrangement direction of the first reflective mirror (19) and light emitted by the laser (24) is 45 degrees;
the second reflective mirror (23) is connected with the shell and arranged on one side of the cage system fixing seat (25), the second reflective mirror (23) is perpendicular to the first reflective mirror (19), and the center of the second reflective mirror (23) is located on the axis of the light passing hole.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115639650A (en) * | 2022-12-26 | 2023-01-24 | 武汉乾希科技有限公司 | Laser of light transmitting and receiving component and optical module |
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