CN210626326U - Multi-gas concentration detection device and alarm device - Google Patents
Multi-gas concentration detection device and alarm device Download PDFInfo
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- CN210626326U CN210626326U CN201921322847.6U CN201921322847U CN210626326U CN 210626326 U CN210626326 U CN 210626326U CN 201921322847 U CN201921322847 U CN 201921322847U CN 210626326 U CN210626326 U CN 210626326U
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Abstract
The utility model provides a multi-gas concentration detection device and an alarm device, wherein the multi-gas concentration detection device comprises a reflection air chamber, a middle infrared light source, a light filter and a multi-channel detector, and the reflection air chamber is provided with a first through hole and a second through hole; the middle infrared light source is inserted in the first through hole; the optical filter at least comprises a reference optical filter, a first optical filter and a second optical filter; the multi-channel detector at least comprises a reference channel, a first channel and a second channel which are positioned on the same horizontal plane and face the second through hole, the reference optical filter covers a light inlet of the reference channel, the first optical filter covers the light inlet of the first channel, the second optical filter covers the light inlet of the second channel, and light rays emitted by the intermediate infrared light source are gathered to the reference channel, the first channel and the second channel through the reflecting air chamber. The utility model discloses a many gas concentration detection device can the synchronous detection multiple gas and its mist's concentration.
Description
Technical Field
The utility model relates to a gas concentration monitoring technology field especially relates to a many gas concentration detection device and alarm device.
Background
In recent years, with the rapid development of economy and the continuous acceleration of urbanization process in China, the environmental pollution problem is more and more severe. The atmospheric environmental pollution brings great influence to our production and life, and gas pollution such as industrial waste is the central importance of atmospheric environmental monitoring and treatment at present. For example, gases such as nitrogen oxides and sulfides emitted in industrial processes are easy to generate acid rain, so that soil acidification is caused, and agricultural production is damaged; hydrocarbons and carbon oxides emitted from automobile exhaust belong to greenhouse gases, which aggravate the greenhouse effect and threaten the global ecological environment. In addition, real-time monitoring of flammable, explosive and other dangerous gases is an important measure for guaranteeing industrial production safety. For example, monitoring the concentration of gases such as methane and carbon monoxide is an effective means for early warning safety accidents such as coal mine gas explosion. Therefore, the gas sensor is developed to effectively monitor the concentration of flammable, explosive, toxic and harmful gases, is a powerful guarantee for the healthy life of people and the industrial safety production, and has important social value and market demand.
The gas sensing method based on the infrared spectrum absorption technology has the advantages of large detection range, high sensitivity, strong selectivity, good explosion resistance, poisoning resistance, long service life and the like, and is rapidly developed in recent years. The working principle is that photon energy matched with energy difference between energy levels is selectively absorbed according to the energy level structure of gas molecules, namely infrared light with specific wavelength is selectively absorbed. The absorbed light wavelength is different due to different molecular energy level structures of different gases. Meanwhile, according to the lambert beer law, the concentration of gas molecules and the light absorption intensity are in a corresponding relationship. Therefore, the gas species can be determined according to the absorption wavelength of the gas molecules, and the concentration of the gas can be determined according to the light absorption intensity at a specific optical path. At present, the research of gas sensors based on infrared absorption spectrum technology is widely concerned at home and abroad. Internationally, Honeywell, Spectrex, usa; german Drager company; tohoku university, Tokyo gas Co., Ltd, Japan; research on infrared gas sensors has been carried out at the university of Turku, finland, and related products have been introduced. In China, units such as Tianjin university, Xian bare station, China mining university, Harbin industry university and the like also make a great deal of research results in the field of infrared gas sensors. However, at present, the field is mostly in the laboratory research stage in China, and no mature product is seen in the market.
At present, infrared gas sensor products released abroad are mostly effective only for single kind of gas according to strong selectivity of gas infrared absorption. However, in practical industrial application environments, multiple parameter sensing measurements of multiple mixed gases are often required, and the adoption of multiple gas sensors will greatly increase industrial cost and system complexity. Therefore, the integration, multifunction and multi-purpose of the infrared gas sensor will become the future development trend. Aiming at the actual requirements of synchronous sensing of various mixed gases, development of a multi-parameter and multi-functional intermediate infrared gas sensor with independent intellectual property rights is developed, and the method has wide application prospect and market requirements.
SUMMERY OF THE UTILITY MODEL
The utility model discloses mainly provide many gas concentration detection device and alarm device to promote gas concentration detection device's detection precision.
In order to solve the technical problem, the utility model discloses a technical scheme be: provided is a multi-gas concentration detection device including:
the reflecting air chamber is provided with a first through hole and a second through hole;
the intermediate infrared light source is inserted in the first through hole;
the optical filter at least comprises a reference optical filter, a first optical filter and a second optical filter; and
the multi-channel detector at least comprises a reference channel, a first channel and a second channel which are located on the same horizontal plane and face the second through hole, the reference optical filter covers a light inlet of the reference channel, the first optical filter covers a light inlet of the first channel, the second optical filter covers a light inlet of the second channel, light rays emitted by the intermediate infrared light source are gathered to the reference channel, the first channel and the second channel through the reflection air chamber to obtain reference light intensity of the reference wavelength light, first light intensity of the first wavelength light and second light intensity of the second wavelength light, the concentration of the first gas is obtained through differential operation of the reference light intensity and the first light intensity, and the concentration of the second gas is obtained through differential operation of the reference light intensity and the second light intensity.
In order to solve the above technical problem, the utility model discloses a still another technical scheme be: the alarm device comprises an alarm and the multi-gas concentration detection device, wherein the alarm is electrically connected with the multi-gas concentration detection device, and the alarm is used for giving out alarm sound when the multi-gas concentration detection device detects that the concentration of combustible gas is greater than a preset value.
The utility model has the advantages that:
1. the utility model discloses in many gas concentration detection device's structural aspect, provided spiral groove air chamber structure and effectively optimized space utilization, improved many gas concentration detection device's the degree of integrating, made many gas concentration detection device more miniaturized. The sensor is simple in structure, realizes modular assembly of the intermediate infrared light source, the multi-channel detector and the reflecting air chamber, has no high-precision light path adjusting process, is good in consistency of the multi-gas concentration detection device, is low in cost, and is suitable for large-scale automatic production.
2. The utility model discloses in many gas concentration detection device's sensing performance aspect, the wavelength division multiplexing many parameter mixed gas concentration sensing method has been proposed. The spectrum interval of each channel filtering window of the multi-gas concentration detection device is matched with the specific mid-infrared absorption spectrum of the gas to be detected, so that each channel selectively detects the gas molecule concentration absorbed by the corresponding spectrum, the multi-parameter synchronous measurement target of the concentrations of various gases and the concentrations of mixed gases of the gases is realized, and the multi-gas concentration detection device is promoted to develop towards multiple functions and multiple purposes.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments are briefly introduced below, and 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 without inventive work, wherein:
fig. 1 is a schematic view of an assembly structure of an embodiment of a multi-gas concentration detection apparatus provided by the present invention;
fig. 2 is an exploded schematic view of an embodiment of the multi-gas concentration detection apparatus provided by the present invention;
fig. 3 is a graph of a spectrum curve of the mid-infrared light source, the reference optical filter, the first optical filter and the second optical filter provided by the present invention;
FIG. 4 is a graph of spectra detected by a mid-IR light source and a multi-channel detector;
fig. 5 is a schematic view illustrating a light path of an embodiment of the multi-gas concentration detection apparatus provided by the present invention;
fig. 6 is a schematic flow chart illustrating a manufacturing method of a multi-gas concentration detection apparatus according to an embodiment of the present invention;
fig. 7 is a schematic flow chart of another embodiment of the method for manufacturing a multi-gas concentration detection apparatus according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Please refer to fig. 1 to 4, fig. 1 is an assembly structure diagram of an embodiment of the multi-gas concentration detecting device 100 provided by the present invention, fig. 2 is an exploded structure diagram of an embodiment of the multi-gas concentration detecting device 100 provided by the present invention, fig. 3 is a spectrum graph of the mid-infrared light source 20, the reference light filter, the first light filter and the second light filter provided by the present invention, and fig. 4 is a spectrum graph of the mid-infrared light source 20 and the multi-channel detector 30.
The utility model provides a many gas concentration detection device 100, many gas concentration detection device 100 can detect out the concentration of multiple gas in step, realize the many parameter synchronous measurement target to the concentration of multiple gas and mist concentration, promote many gas concentration detection device 100 to integrating the direction development. The following embodiments will explain the example of the multi-gas concentration detection apparatus 100 detecting two gases simultaneously, and it is understood that the multi-gas concentration detection apparatus 100 can detect three gases, four gases, and the like simultaneously. For example: methane, acetylene, ethane, formaldehyde, hydrocarbons, carbon dioxide, carbon monoxide, nitric oxide, hydrogen fluoride, methyl mercaptan, methyl sulfuric acid, dimethyl sulfide, carbon disulfide, hydrogen sulfide, and the like.
The utility model discloses a many gas concentration detection device 100 includes reflection air chamber 10, mid-infrared light source 20, light filter and multichannel detector 30. The optical filter at least includes a reference optical filter, a first optical filter and a second optical filter, and the multi-channel detector 30 at least includes a reference channel, a first channel and a second channel located on the same horizontal plane.
The reflecting air chamber 10 is provided with a first through hole and a second through hole; the mid-infrared light source 20 is inserted in the first through hole; the reference optical filter covers the light inlet of the reference channel to allow the light with the reference wavelength to pass through, the first optical filter covers the light inlet of the first channel to allow the light with the first wavelength b to pass through, and the second optical filter covers the light inlet of the second channel to allow the light with the second wavelength c to pass through; light emitted by the mid-infrared light source 20 is collected to the reference channel, the first channel and the second channel through the reflection gas chamber 10 to obtain reference light a intensity of reference wavelength light, first light intensity of first wavelength light b and second light intensity of second wavelength light c, the concentration of the first gas is obtained through differential operation processing of the reference light a intensity and the first light intensity, and the concentration of the second gas is obtained through differential operation processing of the reference light a intensity and the second light intensity.
It is first noted that the mid-infrared light source 20 emits light in a wavelength band between 3000 nm and 7000 nm, which is more easily absorbed by the gas to be measured. For example, methane absorbs light having a wavelength of 3310nm at 200 times higher than light having a wavelength of 1670nm, thereby improving the detection accuracy of the dual-channel detector 30. Light having a central wavelength of 4200nm to 4300nm is more easily absorbed by carbon dioxide. Light having a central wavelength of 4600nm to 4700nm is more easily absorbed by carbon monoxide. The center wavelength of the reference wavelength light may be set to 3930nm to 3950nm, and light in this wavelength band is not easily absorbed by the gas.
Firstly, light emitted by the mid-infrared light source 20 propagates along a channel in the reflecting gas chamber 10, and in the process of propagating the light, each gas molecule selectively absorbs photon energy matched with the energy level energy difference of the gas molecule according to the energy level structure of the gas molecule, namely, each gas in the mixed gas generates light absorption action on the light with specific wavelength, so that the light intensity of the light with specific wavelength is reduced, and meanwhile, the type of the gas in the mixed gas can be determined according to the change condition of a certain wavelength in the light from the opposite side; then the multi-channel detector 30 detects the light intensity of the light with the specific wavelength absorbed by the mixed gas and converts the light intensity signal into a corresponding electrical signal; finally, according to the lambert beer's law, under a fixed optical path length, the light intensity of the light with the specific wavelength after being absorbed has a linear corresponding relation with the concentration of the corresponding type of gas, and the concentration of the corresponding type of gas is converted by detecting the variation of the light intensity of the specific wavelength.
In the present embodiment, under the same action distance between light and gas, the light intensity differential signal detected by the multi-channel detector 30 changes more as the gas concentration increases, so that a mathematical relationship curve corresponding to the gas concentration and the light intensity differential signal of the detector one to one is established to realize the gas concentration sensing measurement, thereby forming the multi-channel detector 30. The multi-gas concentration detection device 100 simultaneously detects the reference light a, the first wavelength light b and the second wavelength light c by using the integrated multi-channel detector 30, so that the reference light a, the first wavelength light b and the second wavelength light c have completely the same source and propagation path, and the light intensity disturbance caused by external environment, reflection scattering and the like is completely the same as the light loss, therefore, the light intensity dynamic disturbance caused by the intensity fluctuation and propagation loss of the intermediate infrared light source 20 can be effectively eliminated by using the differential signal of the reference light a and the first wavelength light b and the differential signal of the reference light a and the second wavelength light c, the detection precision of the multi-gas concentration detection device 100 is further improved, and the synchronous detection of multiple gases is realized. The utility model discloses in many gas concentration detection device's sensing performance aspect, the wavelength division multiplexing many parameter mixed gas concentration sensing method has been proposed. The spectrum interval of each channel filtering window of the multi-gas concentration detection device is matched with the specific mid-infrared absorption spectrum of the gas to be detected, so that each channel selectively detects the gas molecule concentration absorbed by the corresponding spectrum, the multi-parameter synchronous measurement target of the concentrations of various gases and the concentrations of mixed gases of the gases is realized, and the multi-gas concentration detection device is promoted to develop towards multiple functions and multiple purposes.
The multi-channel detector 30 may be a pyroelectric combustible gas detector, and includes a photo resistor and a circuit board electrically connected to the photo resistor, wherein the photo resistor changes its resistance value under the irradiation of light, so as to change the current flowing through the photo resistor, and the circuit board receives the current and converts the current into a periodic electrical signal, which is amplified and conditioned by a circuit and then converted into a digital signal by an a/D converter.
Referring to fig. 1, fig. 2 and fig. 5, fig. 5 is a schematic diagram of an optical path of an embodiment of the multi-gas concentration detection apparatus 100 according to the present invention.
Specifically, the reflection air chamber 10 includes a reflection chamber 11 and a diffusion window 12, the reflection chamber 11 is provided with a spiral groove 112, a first end of the spiral groove 112 is provided with a first through hole, a second end of the spiral groove 112 is provided with a second through hole, the first end of the spiral groove 112 may be a start end, and the second end of the spiral groove 112 may be a stop end, so as to ensure that an optical path irradiated by light emitted by the mid-infrared light source 20 is the largest. The diffusion window 12 is provided with a diffusion channel 122, the diffusion window 12 covers the opening of the spiral groove 112, the diffusion channel 122 is communicated with the spiral groove 112, and the diffusion channel 122 allows the mixed gas to flow into the spiral groove 112. Light from the mid-infrared light source 20 exits the first end of the spiral groove 112 and reaches the multi-channel detector 30 at the second end of the spiral groove 112 after being reflected off the spiral groove 112 and the diffusion window 12. The spiral groove 112 of the reflection chamber 11 enables the light emitted by the mid-infrared light source 20 to have a sufficient optical path to react with the mixed gas without increasing the volume of the reflection chamber 11, so as to improve the measurement accuracy. The utility model discloses in many gas concentration detection device's structural aspect, provided spiral groove air chamber structure and effectively optimized space utilization, improved many gas concentration detection device's the degree of integrating, made many gas concentration detection device more miniaturized. The sensor is simple in structure, realizes modular assembly of the intermediate infrared light source, the multi-channel detector and the reflecting air chamber, has no high-precision light path adjusting process, is good in consistency of the multi-gas concentration detection device, is low in cost, and is suitable for large-scale automatic production.
The diffusion channel 122 faces the side wall of the spiral groove 112, and the width of the diffusion channel 122 is larger than the width of the side wall of the spiral groove 112, so that the mixed gas can enter the spiral groove 112 through the diffusion channel 122, and the light emitted by the infrared light source can be prevented from being emitted from the diffusion channel 122 in the process of propagation.
The inner wall of the spiral groove 112 is polished to a roughness of 2 to 4 microns, and/or the surface of the diffusion window 12 facing the spiral groove 112 is polished to a roughness of 2 to 4 microns.
Alternatively, the inner wall of the spiral groove 112 may be plated with a high-reflectivity metal film to improve reflectivity. And/or the surface of the diffusion window 12 facing the spiral groove 112 may also be plated with a high-reflectivity metal film to enhance reflectivity.
The high-reflectivity metal film includes: any one of a gold film of 50 to 200nm, a silver film of 50 to 200nm, a titanium dioxide film of 100 to 200nm, a vanadium pentoxide film of 100 to 200nm, a silicon dioxide film of 100 to 200nm, a magnesium fluoride film of 100 to 200nm, and a silicon nitride film of 100 to 200 nm.
The reflective air chamber 10 further includes a first reflective plate 13 and a second reflective plate 14, the first reflective plate 13 and the second reflective plate 14 are respectively connected to the diffusion window 12 and inserted into the spiral groove 112, the first reflective plate 13 forms an angle of 45 degrees with the axial direction of the first through hole to reflect the light emitted from the mid-infrared light source 20, and the second reflective plate 14 forms an angle of 45 degrees with the axial direction of the second through hole to reflect the light to the multi-channel detector 30. The first reflector 13 and the second reflector 14 cooperate with each other to allow as much light emitted in the axial direction of the mid-infrared light source 20 to reach the multi-channel detector 30 as possible.
Optionally, the first reflective plate 13 and/or the second reflective plate 14 are polished to a roughness of 2 to 4 μm.
Optionally, the first reflection plate 13 and/or the second reflection plate 14 are plated with a high-reflectivity metal film.
The reflecting air chamber 10 further includes a positioning post 15, one of the reflecting chamber 11 and the diffusion window 12 is connected to the positioning post 15, the other of the reflecting chamber 11 and the diffusion window 12 is provided with a positioning hole 114, and the positioning post 15 is inserted into the positioning hole 114 to fix the reflecting chamber 11 and the diffusion window 12 to each other. In addition, the positioning post 15 is matched with the positioning hole 114, so that the disassembly between the reflecting chamber 11 and the diffusion window 12 is also facilitated.
The reflecting gas cell 10 further comprises a mounting base 16, the mid-infrared light source 20 and the multi-channel detector 30 being respectively connected to the mounting base 16, the mounting base 16 being connected to a side of the reflecting cell 11 remote from the diffusing window 12. Through setting up mounting base 16 to be used for installing light source 20 and binary channels detector 30, can be so that the structure is compacter, and can fix light source 20 and binary channels detector 30 simultaneously through an component, and then reduced the quantity of component, and also reduced the installation complexity, be convenient for installation and dismantlement have improved the installation accuracy simultaneously.
The utility model discloses another aspect still provides a combustible gas alarm device, and combustible gas alarm device includes alarm and many gas concentration detection device 100, and the alarm is connected with many gas concentration detection device 100 electricity, and the alarm is used for sending out the warning sound when many gas concentration detection device 100 detect combustible gas's concentration is greater than the default.
In this embodiment, the structure of the multi-gas concentration detection apparatus 100 is the same as the structure of the multi-gas concentration detection apparatus 100 in the above embodiment, please refer to the description in the above embodiment, and the description thereof is omitted here. The default of combustible gas concentration can set up according to explosion-proof demand, the embodiment of the utility model provides a do not specifically prescribe a limit.
Referring to fig. 1, fig. 2, fig. 3, fig. 4 and fig. 6, fig. 6 is a schematic flow chart illustrating a manufacturing method of the multiple gas concentration detection apparatus 100 according to an embodiment of the present invention.
S101: a reflecting air chamber 10 with a first through hole and a second through hole is manufactured.
S102: the mid-infrared light source 20 is inserted into the first through hole.
The mid-infrared light source 20 is inserted into the first through hole to emit light in a wavelength band of 3000 nm to 3500 nm, and the light is reflected and transmitted in the reflective air chamber 10. The light emitted from the mid-infrared light source 20 is more easily absorbed by the gas to be detected, for example, the absorption intensity of methane for the light with the wavelength of 3310nm is 200 times that of the light with the wavelength of 1670nm, thereby improving the detection accuracy of the multi-gas concentration detection apparatus 100.
S103: the multi-channel detector 30 is positioned towards the second through-hole, wherein the multi-channel detector 30 comprises at least a reference channel, a first channel and a second channel located on the same horizontal plane towards the second through-hole.
S104: providing an optical filter, wherein the optical filter at least comprises a reference optical filter, a first optical filter and a second optical filter, covering the reference optical filter on the light inlet of the reference channel, covering the first optical filter on the light inlet of the first channel, and covering the second optical filter on the light inlet of the second channel.
The multi-channel detector 30 is disposed toward the second through hole and configured to receive light reflected by the reflective air chamber 10, the multi-channel detector 30 at least includes a reference channel, a first channel, and a second channel, which are located on the same horizontal plane and face the second through hole, and an optical filter is provided, the optical filter at least includes a reference optical filter, a first optical filter, and a second optical filter, and the reference optical filter, the first optical filter, and the second optical filter respectively cover the light inlet of the reference channel, the light inlet of the first channel, and the light inlet of the second channel, so as to detect light with three wavelengths synchronously. By arranging that the reference channel, the first channel and the second channel in the multi-channel detector 30 are located on the same horizontal plane, incident light entering the reference channel, the first channel and the second channel can enter at the same time, so that the compensation error is reduced, and the detection precision of the multi-gas concentration detection device 100 is improved.
The reference optical filter covers the light inlet of the reference channel to allow the light with the reference wavelength to pass through, the first optical filter covers the light inlet of the first channel to allow the light with the first wavelength b to pass through, and the second optical filter covers the light inlet of the second channel to allow the light with the second wavelength c to pass through; light emitted by the mid-infrared light source 20 is collected to the reference channel, the first channel and the second channel through the reflection gas chamber 10 to obtain reference light a intensity of reference wavelength light, first light intensity of first wavelength light b and second light intensity of second wavelength light c, the concentration of the first gas is obtained through differential operation processing of the reference light a intensity and the first light intensity, and the concentration of the second gas is obtained through differential operation processing of the reference light a intensity and the second light intensity.
Referring to fig. 1, fig. 2, fig. 3, fig. 4 and fig. 7, fig. 7 is a schematic flow chart illustrating a method for manufacturing a multi-gas concentration detection apparatus 100 according to another embodiment of the present invention.
S201: the reflection chamber 11 formed with the spiral groove 112 is dug, and a first through hole is opened at a first end of the spiral groove 112, and a second through hole is opened at a second end of the spiral groove 112.
S202: the diffusion window 12 formed with the diffusion passage 122 is dug.
S203: the diffusion window 12 is covered at the opening of the spiral groove 112 and the diffusion passage 122 is communicated with the spiral groove 112.
The reflecting air chamber 10 includes a reflecting chamber 11 and a diffusion window 12, the reflecting chamber 11 is provided with a spiral groove 112, a first end of the spiral groove 112 is provided with a first through hole, a second end of the spiral groove 112 is provided with a second through hole, the first end of the spiral groove 112 can be a start end, and the second end of the spiral groove 112 can be a stop end, so as to ensure that the optical path irradiated by the light emitted by the mid-infrared light source 20 is the largest. The diffusion window 12 is provided with a diffusion channel 122, the diffusion window 12 covers the opening of the spiral groove 112, the diffusion channel 122 is communicated with the spiral groove 112, and the diffusion channel 122 allows the mixed gas to flow into the spiral groove 112. Light from the mid-infrared light source 20 exits the first end of the spiral groove 112 and reaches the multi-channel detector 30 at the second end of the spiral groove 112 after being reflected off the spiral groove 112 and the diffusion window 12. The spiral groove 112 of the reflection chamber 11 enables the light emitted by the mid-infrared light source 20 to have a sufficient optical path to react with the mixed gas without increasing the volume of the reflection chamber 11, so as to improve the measurement accuracy.
S204: the mid-infrared light source 20 is inserted into the first through hole.
The mid-infrared light source 20 is inserted into the first through hole to emit light in a wavelength band of 3000 nm to 3500 nm, and the light is reflected and transmitted in the reflective air chamber 10. The light emitted from the mid-infrared light source 20 is more easily absorbed by the gas to be detected, for example, the absorption intensity of methane for the light with the wavelength of 3310nm is 200 times that of the light with the wavelength of 1670nm, thereby improving the detection accuracy of the multi-gas concentration detection apparatus 100.
S205: the multi-channel detector 30 is positioned towards the second through-hole, wherein the multi-channel detector 30 comprises at least a reference channel, a first channel and a second channel located on the same horizontal plane towards the second through-hole.
S206: providing an optical filter, wherein the optical filter at least comprises a reference optical filter, a first optical filter and a second optical filter, covering the reference optical filter on the light inlet of the reference channel, covering the first optical filter on the light inlet of the first channel, and covering the second optical filter on the light inlet of the second channel.
The multi-channel detector 30 is disposed toward the second through hole and configured to receive light reflected by the reflective air chamber 10, the multi-channel detector 30 at least includes a reference channel, a first channel, and a second channel, which are located on the same horizontal plane and face the second through hole, and an optical filter is provided, the optical filter at least includes a reference optical filter, a first optical filter, and a second optical filter, and the reference optical filter, the first optical filter, and the second optical filter respectively cover the light inlet of the reference channel, the light inlet of the first channel, and the light inlet of the second channel, so as to detect light with three wavelengths synchronously. By arranging that the reference channel, the first channel and the second channel in the multi-channel detector 30 are located on the same horizontal plane, incident light entering the reference channel, the first channel and the second channel can enter at the same time, so that the compensation error is reduced, and the detection precision of the multi-gas concentration detection device 100 is improved.
The reference optical filter covers the light inlet of the reference channel to allow the light with the reference wavelength to pass through, the first optical filter covers the light inlet of the first channel to allow the light with the first wavelength b to pass through, and the second optical filter covers the light inlet of the second channel to allow the light with the second wavelength c to pass through; light emitted by the mid-infrared light source 20 is collected to the reference channel, the first channel and the second channel through the reflection gas chamber 10 to obtain reference light a intensity of reference wavelength light, first light intensity of first wavelength light b and second light intensity of second wavelength light c, the concentration of the first gas is obtained through differential operation processing of the reference light a intensity and the first light intensity, and the concentration of the second gas is obtained through differential operation processing of the reference light a intensity and the second light intensity.
It should be noted that the spiral gas concentration detection device mentioned in this embodiment may be the spiral gas concentration detection device in any of the above embodiments, which is not described herein again.
The above is only the embodiment of the present invention, not the limitation of the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.
Claims (10)
1. A multiple gas concentration detection apparatus, characterized by comprising:
the reflecting air chamber is provided with a first through hole and a second through hole;
the intermediate infrared light source is inserted in the first through hole;
the optical filter at least comprises a reference optical filter, a first optical filter and a second optical filter; and
the multi-channel detector at least comprises a reference channel, a first channel and a second channel which are located on the same horizontal plane and face the second through hole, the reference optical filter covers a light inlet of the reference channel, the first optical filter covers a light inlet of the first channel, the second optical filter covers a light inlet of the second channel, light rays emitted by the intermediate infrared light source are gathered to the reference channel, the first channel and the second channel through the reflection air chamber to obtain reference light intensity of the reference wavelength light, first light intensity of the first wavelength light and second light intensity of the second wavelength light, the concentration of the first gas is obtained through the reference light intensity and first light intensity differential operation, and the concentration of the second gas is obtained through the reference light intensity and second light intensity differential operation.
2. The multi-gas concentration detection device according to claim 1, wherein the reflection gas chamber includes a reflection chamber and a diffusion window, the reflection chamber is provided with a spiral groove, a first end of the spiral groove is provided with the first through hole, a second end of the spiral groove is provided with the second through hole, the diffusion window is provided with a diffusion channel, the diffusion window covers an opening of the spiral groove, and the diffusion channel is communicated with the spiral groove.
3. The multi-gas concentration detection apparatus according to claim 2, wherein the diffusion channel faces a side wall of the spiral groove, and a width of the diffusion channel is larger than a width of the side wall of the spiral groove.
4. The multi-gas concentration detection apparatus according to claim 2, wherein the roughness of the inner wall of the spiral groove is 2 to 4 micrometers, and/or the roughness of the surface of the diffusion window facing the spiral groove is 2 to 4 micrometers.
5. The multi-gas concentration detection apparatus according to claim 2, wherein the reflection gas chamber further comprises a positioning column, one of the reflection chamber and the diffusion window is connected to the positioning column, and the other of the reflection chamber and the diffusion window is provided with a positioning hole, and the positioning column is inserted into the positioning hole to fix the reflection chamber and the diffusion window to each other.
6. The multi-gas concentration detection apparatus of claim 2, wherein the reflection gas chamber further comprises a mounting base, the mid-infrared light source and the multi-channel detector are respectively connected with the mounting base, and the mounting base is connected with a side of the reflection chamber away from the diffusion window.
7. The multi-gas concentration detection apparatus according to claim 2, wherein the reflection gas chamber further includes a first reflection plate and a second reflection plate, the first reflection plate and the second reflection plate are respectively connected to the diffusion window and inserted into the spiral groove, the first reflection plate is at an angle of 45 degrees with respect to an axial direction of the first through hole to reflect the light emitted from the mid-infrared light source, and the second reflection plate is at an angle of 45 degrees with respect to an axial direction of the second through hole to reflect the light to the multi-channel detector.
8. The multi-gas concentration detection apparatus according to claim 7, wherein the roughness of the first reflection plate is 2 to 4 micrometers, and/or the roughness of the second reflection plate is 2 to 4 micrometers.
9. The multi-gas concentration detection apparatus according to claim 4, wherein an inner wall of the spiral groove is plated with a high-reflectivity metal film, and/or a surface of the diffusion window facing the spiral groove is plated with a high-reflectivity metal film;
wherein the high-reflectivity metal film includes: any one of a gold film, a silver film, a titanium dioxide film, a vanadium pentoxide film, a silicon dioxide film, a magnesium fluoride film, and a silicon nitride film.
10. An alarm device, comprising an alarm device and the multi-gas concentration detection device according to any one of claims 1 to 9, wherein the alarm device is electrically connected to the multi-gas concentration detection device, and the alarm device is configured to emit an alarm sound when the multi-gas concentration detection device detects that the concentration of combustible gas is greater than a preset value.
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| CN201921322847.6U CN210626326U (en) | 2019-08-15 | 2019-08-15 | Multi-gas concentration detection device and alarm device |
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| CN201921322847.6U CN210626326U (en) | 2019-08-15 | 2019-08-15 | Multi-gas concentration detection device and alarm device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110361354A (en) * | 2019-08-15 | 2019-10-22 | 深圳市诺安环境安全股份有限公司 | More gas concentration detection apparatus and preparation method thereof, warning device |
| CN111929269A (en) * | 2020-09-23 | 2020-11-13 | 上海翼捷工业安全设备股份有限公司 | Three-channel infrared methane detector resistant to water vapor interference |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110361354A (en) * | 2019-08-15 | 2019-10-22 | 深圳市诺安环境安全股份有限公司 | More gas concentration detection apparatus and preparation method thereof, warning device |
| CN110361354B (en) * | 2019-08-15 | 2023-09-26 | 深圳市诺安智能股份有限公司 | Multi-gas concentration detection device, manufacturing method thereof and alarm device |
| CN111929269A (en) * | 2020-09-23 | 2020-11-13 | 上海翼捷工业安全设备股份有限公司 | Three-channel infrared methane detector resistant to water vapor interference |
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