CN112683835A - Mixed gas detection device and system - Google Patents
Mixed gas detection device and system Download PDFInfo
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- CN112683835A CN112683835A CN202011504881.2A CN202011504881A CN112683835A CN 112683835 A CN112683835 A CN 112683835A CN 202011504881 A CN202011504881 A CN 202011504881A CN 112683835 A CN112683835 A CN 112683835A
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- mixed gas
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- gas
- analysis cavity
- light source
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- 238000001514 detection method Methods 0.000 title claims abstract description 32
- 230000003287 optical effect Effects 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 18
- 238000001228 spectrum Methods 0.000 claims abstract description 16
- 230000003595 spectral effect Effects 0.000 claims abstract description 9
- 238000000926 separation method Methods 0.000 claims abstract description 8
- 230000001678 irradiating effect Effects 0.000 claims abstract description 5
- 239000007789 gas Substances 0.000 claims description 128
- 238000001914 filtration Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 238000000862 absorption spectrum Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 14
- 238000010586 diagram Methods 0.000 description 8
- 229910002092 carbon dioxide Inorganic materials 0.000 description 7
- 239000001569 carbon dioxide Substances 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000003595 mist Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000003463 adsorbent Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005518 electrochemistry Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Abstract
The invention discloses a mixed gas detection device and a system, which are characterized by comprising the following components: the device comprises a light source, an analysis cavity, a micro-channel and an optical sensing chip, wherein the light source is used for generating projection light and irradiating the analysis cavity; the analysis cavity is used for containing mixed gas to be detected; the optical sensing chip is used for receiving the projection light passing through the analysis cavity and detecting the spectral information of the projection light; the microchannel is used for introducing the mixed gas to be detected into the analysis cavity, and an adsorbing material aiming at the specified gas is arranged on the microchannel and used for adsorbing the specified gas in the mixed gas and slowing down the speed of the specified gas introduced into the analysis cavity. According to the invention, through the structural design of the micro-channel, a part of gas components are adsorbed before the mixed gas enters the analysis cavity, so that the speed of introducing the mixed gas into the analysis cavity is slowed down, the temporary separation of the mixed gas is realized, the degree of spectrum aliasing is reduced, and the detection precision of the gas components in the mixed gas can be improved.
Description
Technical Field
The invention relates to the technical field of optical detection, in particular to a mixed gas detection device and system.
Background
The traditional gas detector generally uses methods such as chemical reaction, electrochemistry and the like to detect gas, has limited service life, insufficient precision and accuracy and is easily influenced by the external environment. With the development of optical detection technology, optical principles are applied to gas detection, and gas components are determined by means of spectral analysis. However, in practical applications, detection of a mixed gas is often faced with the desire to detect a target gas from the mixed gas or to determine the total composition of the mixed gas.
In the process of detecting the mixed gas, due to uncertain proportions of various gas components, the obtained spectrum information has more interference, the spectrums of various gas components in the mixed gas have aliasing, the components of the target gas are difficult to detect from the mixed gas, especially when the content of the target gas is low, the target gas is difficult to detect, and the aliasing of the spectrums causes great interference to the determination of the components of all the mixed gas.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a method.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a mixed gas detection apparatus comprising: a light source, an analysis cavity, a micro-channel and an optical sensing chip,
the light source is used for generating projection light and irradiating the analysis cavity;
the analysis cavity is used for containing mixed gas to be detected;
the optical sensing chip is used for receiving projection light passing through the analysis cavity and detecting spectral information of the projection light;
the microchannel is connected with the analysis cavity and used for introducing the mixed gas to be detected into the analysis cavity, and an adsorbing material for specified gas is arranged on the microchannel and used for adsorbing the specified gas in the mixed gas in the introduction process of the mixed gas and slowing down the introduction speed of the specified gas into the analysis cavity.
Furthermore, the mixed gas detection device further comprises a filtering component, which is arranged between the light source and the analysis cavity and is used for filtering the continuous spectrum projection light emitted by the light source and generating narrow-band projection light to irradiate the analysis cavity.
Furthermore, the filtering component comprises a plurality of single-band filtering lenses corresponding to different bands, the single-band filtering lenses are arranged on a rotatable objective table, and a plurality of narrow-band projection lights are sequentially generated to irradiate the analysis cavity through the rotation of the objective table.
Further, a lens assembly is arranged between the analysis cavity and the optical sensing chip for focusing the projected light passing through the analysis cavity onto the optical sensing chip.
Further, the light source is an infrared light source, and the detecting spectral information of the projected light includes: an infrared absorption spectrum of the projected light is detected.
Further, a suction pump is arranged in the analysis cavity and used for discharging the mixed gas in the analysis cavity outwards.
Furthermore, the micro-channels are multiple, adsorbing materials for different specified gases are arranged on each micro-channel, and different gas components in the mixed gas are separated by switching the micro-channels.
Furthermore, the light source, the analysis cavity, the micro-channel and the optical sensing chip are multiple, the micro-channel and the analysis cavities are connected together in series, adsorbing materials aiming at different specified gases are arranged on the micro-channels, and each analysis cavity corresponds to one light source and one optical sensing chip.
Further, an air pump is arranged on the last analysis chamber for exhausting the mixed gas in each analysis chamber outwards.
According to the mixed gas detection device and the mixed gas detection system, through the structural design of the micro-channel, a part of gas components are adsorbed before the mixed gas enters the analysis cavity, so that the speed of introducing the mixed gas into the analysis cavity is reduced, the temporary separation of the mixed gas is realized, an optical sensing chip can acquire the gas spectrum information after the part of gas components are separated, the spectrum aliasing degree is reduced, and the detection precision of the gas components in the mixed gas can be improved.
Drawings
Fig. 1 is a schematic structural diagram of a mixed gas detection device according to a preferred embodiment of the invention.
Fig. 2 is a schematic structural diagram of a filter component according to a preferred embodiment of the invention.
FIG. 3 is a schematic structural diagram of a mixed gas detecting apparatus according to another preferred embodiment of the present invention.
FIG. 4 is a schematic diagram of a mixed gas detection system according to a preferred embodiment of the present invention.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
In the following detailed description of the embodiments of the present invention, in order to clearly illustrate the structure of the present invention and to facilitate explanation, the structure shown in the drawings is not drawn to a general scale and is partially enlarged, deformed and simplified, so that the present invention should not be construed as limited thereto.
In the following embodiments of the present invention, a mixed gas detection apparatus is proposed that detects a gas component in a mixed gas by using the influence of the gas on the spectrum of projected light. In the invention, through the structural design of the micro-channel, a part of gas components are adsorbed before the mixed gas enters the analysis cavity so as to slow down the speed of introducing into the analysis cavity and realize the temporary separation of the mixed gas, so that the optical sensing chip can obtain the gas spectrum information after the part of gas components are separated, the spectrum aliasing degree is reduced, and the detection precision of the gas components in the mixed gas can be improved.
Referring to fig. 1, a schematic structural diagram of a mixed gas detecting apparatus according to a preferred embodiment of the present invention is shown, the apparatus including: a light source, an analysis cavity, a micro-channel and an optical sensing chip, wherein,
the light source is used for generating projection light and irradiating the analysis cavity. Specifically, an infrared light source may be used to irradiate the mixed gas to generate an infrared absorption spectrum. Correspondingly, the optical sensing chip is used for receiving projection light passing through the analysis cavity and detecting spectral information of the projection light. If the infrared light source is adopted for irradiation, the generated spectral information is an infrared absorption spectrum, gas molecules connected through chemical bonds can continuously vibrate and rotate, when infrared light irradiates, the same frequency components in infrared light can be absorbed, energy transition occurs, after partial frequency of the infrared light is absorbed, the formed spectrum is the infrared absorption spectrum, and the infrared absorption spectrum has a fingerprint effect and can be used for determining gas components.
The analysis chamber in fig. 1 is used for containing the mixed gas to be detected, and the analysis chamber is connected with the microchannel and used for introducing the mixed gas to be detected into the analysis chamber. The microchannel is provided with an adsorbing material aiming at specified gas, and is used for adsorbing the specified gas in the mixed gas in the process of introducing the mixed gas, slowing down the speed of introducing the specified gas into the analysis cavity to realize the separation of the mixed gas. Such a method may be applied to a case where a part of the gas components in the mixed gas is known, and separation is performed by the adsorbent material in the micro channel in order to eliminate interference of the known gas components, for example, detection requirement is to determine whether methane exists in the mixed gas and the mixed gas contains a large amount of carbon dioxide, in this case, temporary separation of carbon dioxide in the mixed gas may be first achieved by providing the adsorbent material capable of adsorbing carbon dioxide in the micro channel, so that whether the mixed gas in the analysis chamber contains methane may be detected in a case where interference of carbon dioxide is eliminated or reduced. In addition, the specified gas can be one gas or a plurality of gases, namely, the adsorption of the gases is realized through the adsorbing material of the micro-channel, so that the detection precision of other gas components in the mixed gas is improved.
In addition, the analysis cavity can be further provided with a suction pump for discharging the mixed gas in the analysis cavity outwards, so that the gas in the analysis cavity can continuously flow, and the change of the components of the mixed gas in the environment can be continuously detected.
Furthermore, a filtering component can be arranged between the light source and the analysis cavity and used for filtering projection light of continuous spectrum emitted by the light source to generate projection light of narrow wave band to irradiate the analysis cavity, interference between the projection light of different wave bands can be reduced by irradiating the projection light of the narrow wave band, and spectral information of a specified wave band can be selectively acquired.
Referring to fig. 2, which is a schematic structural diagram of a filter component according to a preferred embodiment of the present invention, a side view of the filter component is shown on the left side of fig. 2, and a front view is shown on the right side of fig. 2, where the filter component may include a plurality of single-band filter lenses corresponding to different wavelength bands, the plurality of single-band filter lenses are disposed on a rotatable stage, and a plurality of narrow-band projection lights are sequentially generated and irradiated to the analysis cavity by rotation of the stage. Through the design of rotatable objective table, can acquire the produced spectral information of the projection light of a plurality of narrow wave bands respectively to be convenient for carry out the analysis respectively to the spectrum of each narrow wave band, promote to the mist detection precision.
In addition, a lens assembly may be disposed between the analysis chamber and the optical sensing chip to focus the projected light passing through the analysis chamber onto the optical sensing chip.
Please refer to fig. 3, which is a schematic structural diagram of a mixed gas detecting apparatus according to another preferred embodiment of the present invention, and the difference from the embodiment shown in fig. 1 is that a plurality of microchannels are provided on the mixed gas detecting apparatus, in which three channels are exemplarily shown, each microchannel is provided with an adsorbing material for different specified gases, and the separation of different gas components in the mixed gas is realized by switching the plurality of microchannels. For example, possible components of the mixed gas to be detected include carbon dioxide, nitrogen, oxygen, methane, and the like, a material for adsorbing carbon dioxide may be disposed on the microchannel on the left side in fig. 3, a material for adsorbing nitrogen may be disposed on the microchannel in the middle, a material for adsorbing oxygen may be disposed on the microchannel on the right side, and then the mixed gas may be introduced into the analysis chamber using the three microchannels, respectively, so that spectra in the case where carbon dioxide, nitrogen, and oxygen are separated can be measured, and the components of the mixed gas can be determined better by comparing the spectra in the three cases. Through setting up a plurality of microchannels, can separate the mist more nimble to improve detection device to the detectability of mist.
Please refer to fig. 4, which is a schematic structural diagram of a mixed gas detecting system according to a preferred embodiment of the present invention, the mixed gas detecting system includes a plurality of the mixed gas detecting devices, wherein the analyzing chambers of the mixed gas detecting devices are connected in series, and the microchannels of the mixed gas detecting devices are provided with adsorbing materials for different specified gases. Furthermore, a suction pump may be provided on the last analysis chamber for discharging the gas mixture in each analysis chamber to the outside. In fig. 4, only as an example, a case where the analysis chambers of two mixed gas detection devices are connected in series is shown, in practical application, a plurality of analysis chambers can be connected in series through a microchannel with an adsorbing material, and different adsorbing materials have different adsorbing capacities for different gases.
The above description is only a preferred embodiment of the present invention, and the embodiments are not intended to limit the scope of the present invention, so that all equivalent structural changes made by using the contents of the specification and the drawings of the present invention should be included in the scope of the present invention.
Claims (9)
1. A mixed gas detection apparatus, comprising: a light source, an analysis cavity, a micro-channel and an optical sensing chip,
the light source is used for generating projection light and irradiating the analysis cavity;
the analysis cavity is used for containing mixed gas to be detected;
the optical sensing chip is used for receiving projection light passing through the analysis cavity and detecting spectral information of the projection light;
the microchannel is connected with the analysis cavity and used for introducing the mixed gas to be detected into the analysis cavity, and an adsorbing material for specified gas is arranged on the microchannel and used for adsorbing the specified gas in the mixed gas in the introduction process of the mixed gas and slowing down the introduction speed of the specified gas into the analysis cavity.
2. The mixed gas detection device according to claim 1, further comprising a filter member disposed between the light source and the analysis chamber for filtering the continuous spectrum of projection light emitted from the light source to generate a narrow-band projection light to illuminate the analysis chamber.
3. The mixed gas detection device according to claim 2, wherein the filter member includes a plurality of single-band filter lenses corresponding to different wavelength bands, the plurality of single-band filter lenses are disposed on a rotatable stage, and a plurality of narrow-band projection lights are sequentially generated by rotation of the stage and are irradiated to the analysis chamber.
4. The mixed gas detecting device according to any one of claims 1 to 3, wherein a lens assembly is further provided between the analysis chamber and the optical sensor chip for focusing the projected light passing through the analysis chamber onto the optical sensor chip.
5. The mixed gas detecting device according to any one of claims 1 to 3, wherein the light source is an infrared light source, and the detecting the spectral information of the projected light includes: an infrared absorption spectrum of the projected light is detected.
6. The mixed gas detecting device according to any one of claims 1 to 3, wherein a suction pump is further provided in the analysis chamber for discharging the mixed gas in the analysis chamber to the outside.
7. The mixed gas detection device according to any one of claims 1 to 3, wherein the number of the microchannels is plural, each microchannel is provided with an adsorbing material for a different specific gas, and the separation of different gas components in the mixed gas is realized by switching the plurality of microchannels.
8. A mixed gas detection system, comprising:
the mixed gas detection device according to any one of claims 1 to 5, wherein the analysis chambers of the respective mixed gas detection devices are connected in series, and the microchannels of the respective mixed gas detection devices are provided with adsorbing materials for different specified gases.
9. The mixed gas detection system according to claim 8, wherein a suction pump is provided on the last analysis chamber for discharging the mixed gas in each analysis chamber to the outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011504881.2A CN112683835A (en) | 2020-12-18 | 2020-12-18 | Mixed gas detection device and system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011504881.2A CN112683835A (en) | 2020-12-18 | 2020-12-18 | Mixed gas detection device and system |
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| CN112683835A true CN112683835A (en) | 2021-04-20 |
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| CN202011504881.2A Pending CN112683835A (en) | 2020-12-18 | 2020-12-18 | Mixed gas detection device and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115078481A (en) * | 2022-04-27 | 2022-09-20 | 上海化工院检测有限公司 | Folding and punching type multistage detection chamber |
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