CN219777484U - Air ozone concentration analyzer based on ultraviolet absorption method - Google Patents
Air ozone concentration analyzer based on ultraviolet absorption method Download PDFInfo
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- CN219777484U CN219777484U CN202320091801.8U CN202320091801U CN219777484U CN 219777484 U CN219777484 U CN 219777484U CN 202320091801 U CN202320091801 U CN 202320091801U CN 219777484 U CN219777484 U CN 219777484U
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- air
- gas
- reaction chamber
- ozone concentration
- absorption method
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- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000010521 absorption reaction Methods 0.000 title claims abstract description 17
- 238000006243 chemical reaction Methods 0.000 claims abstract description 34
- 230000003287 optical effect Effects 0.000 claims abstract description 19
- 238000001514 detection method Methods 0.000 claims abstract description 12
- 238000012545 processing Methods 0.000 claims abstract description 11
- 230000002238 attenuated effect Effects 0.000 claims abstract description 5
- 229910000889 permalloy Inorganic materials 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 8
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims description 7
- 229910052753 mercury Inorganic materials 0.000 claims description 7
- 239000013618 particulate matter Substances 0.000 claims description 7
- 238000005070 sampling Methods 0.000 claims description 7
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000005388 borosilicate glass Substances 0.000 claims description 4
- 239000004408 titanium dioxide Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 44
- 238000010586 diagram Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- -1 polytetrafluoroethylene Polymers 0.000 description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 description 4
- 239000002033 PVDF binder Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 241000258971 Brachiopoda Species 0.000 description 1
- 239000000809 air pollutant Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- FFNYNHKYVBPMQP-UHFFFAOYSA-N cerium platinum Chemical compound [Ce].[Pt] FFNYNHKYVBPMQP-UHFFFAOYSA-N 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000005201 scrubbing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The utility model discloses an air ozone concentration analyzer based on an ultraviolet absorption method, which comprises a core detection module, an air circuit module and a signal processing module, wherein the core detection module comprises an ultraviolet light source, a reaction chamber, a narrow-band bandpass filter and an optical signal sensing plate with a photoelectric tube, the air circuit module conveys gas to be detected into the reaction chamber, light emitted by the ultraviolet light source enters the reaction chamber through the narrow-band bandpass filter, the light energy of a wave band is absorbed by the gas to be detected to attenuate the light intensity of the wave band, and the optical signal sensing plate senses the light intensity attenuated wave band light and generates an electric signal to be sent into the signal processing module. The ozone concentration analyzer has the advantages of high measurement accuracy and high stability.
Description
Technical Field
The utility model relates to the field of ozone concentration analyzers, in particular to an air ozone concentration analyzer based on an ultraviolet absorption method.
Background
Ozone (O) 3 ) Is an allotrope of oxygen, is an important trace gas in the atmosphere, and plays an important role in the atmosphere. When ozone near the surface increases to some extent, serious atmospheric pollution is caused. The cause of the atmospheric ozone pollution is very complex, and accurate monitoring of the ozone in the atmosphere is a key for judging the atmospheric pollution degree and is also a necessary work for treating the ozone pollution. Ozone has a large absorption value under the irradiation of ultraviolet light, and the concentration value of ozone can be measured by using the lambert-beer law, and the method for measuring the concentration of ozone is also called an ultraviolet light absorption method. The method is currently classified as a standard method (HJ 654-2013) for measuring ozone by a point analysis instrument in the requirements of a continuous automatic monitoring system for environmental air pollutants in China.
The ozone analyzer based on the ultraviolet absorption method produced at present is poor in precision stability, and phenomena such as zero range drift easily occur during long-term testing.
Disclosure of Invention
The utility model provides an air ozone concentration analyzer based on an ultraviolet absorption method, which aims to solve the problem of poor accuracy and stability of an ozone analyzer based on the ultraviolet absorption method in the prior art.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
the air ozone concentration analyzer based on the ultraviolet absorption method comprises an air path module, a signal processing module and a core detection module, wherein the core detection module comprises an ultraviolet light source, a reaction chamber, a narrow-band bandpass filter and an optical signal sensing plate with a photoelectric tube, the ultraviolet light source is a mercury lamp with a shell doped with titanium dioxide, and the center wavelength of the narrow-band bandpass filter is 254nm and the half bandwidth is 10nm; the gas circuit module conveys gas to be detected into the reaction chamber, light emitted by the ultraviolet light source enters the reaction chamber through the narrow-band bandpass filter, 254nm wave band light is formed in the reaction chamber, 254nm wave band light energy is absorbed by the gas to be detected to enable light intensity of the 254nm wave band light to be attenuated, the light intensity attenuated 254nm wave band light is sensed by the light signal sensing plate and an electric signal is generated, and the electric signal generated by the light signal sensing plate is sent into the signal processing module.
Further, the reaction chamber is a borosilicate glass tube.
Further, the optical signal sensing plate is provided with a permalloy shielding cover, and the permalloy shielding cover covers the outside of the optical signal sensing plate.
Further, the core detection module further comprises a closed-loop temperature control unit, the closed-loop temperature control unit comprises a heating module and a temperature sensor, the temperature of the ultraviolet light source is collected by the temperature sensor, and the ultraviolet light source is heated by the heating module based on the temperature collected by the temperature sensor, so that the temperature of the ultraviolet light source is maintained in a stable range.
Further, the gas circuit module includes sampling mouth, calibration mouth, gas vent, aspiration pump, ozone scrubber, particulate matter filter, first three-way solenoid valve, second three-way solenoid valve, three-way connection, the reaction chamber is connected with gas input port, gas output port, the sampling mouth is connected with particulate matter filter air inlet, and the gas outlet of particulate matter filter is connected with an entry of second three-way solenoid valve, the calibration mouth is connected with another entry of second three-way solenoid valve, the export of second three-way solenoid valve with three-way solenoid valve's entry is connected, and an export of three-way connection is connected with ozone scrubber's air inlet, another export of three-way connection is connected with an entry of first three-way solenoid valve, the gas outlet of first three-way solenoid valve is connected with reaction chamber's gas input port, the air inlet of aspiration pump is connected with reaction chamber's gas output port, the gas outlet of pump with the gas vent is connected.
Further, the gas circuit module further comprises a limiting hole, and a gas output port of the reaction chamber is connected with a gas inlet of the gas pump through the limiting hole.
Further, the signal processing module comprises a collecting board and a main control board, wherein the signal output end of the collecting board is connected with the signal input end of the main control board, and the signal output end of the optical signal sensing board is connected with the signal input end of the main control board.
In the core detection module of the utility model, the housing is doped with TIO 2 The mercury lamp is used as an ultraviolet light source, so that interference caused by 185nm wave band radiation of the mercury lamp is reduced; because the mercury lamp shell can not completely filter out useless wave bands, a narrow-band bandpass filter with a center wavelength of 254nm and a half bandwidth of 10nm is added at the inlet of the reaction cavity to further reduce the interference of useless wave bands, thereby improving the measurement accuracy of the ozone analyzer.
Meanwhile, the optical signal sensing plate packaged by permalloy is adopted, the typical radiation sensitivity of the photoelectric tube to 254nm is up to 20mA/W, the signal fluctuation of the photoelectric tube in the optical signal sensing plate due to electromagnetic interference can be reduced through the permalloy shielding cover, and the measuring precision and stability of the ozone analyzer are further improved.
Meanwhile, the borosilicate glass tube is selected as a reaction chamber, so that the interference of external ultraviolet signals is isolated; the ultraviolet light source uses a heating module and a temperature sensor to carry out closed-loop temperature control so as to ensure the stability of the working environment of the ultraviolet light source.
The gas circuit module uses polytetrafluoroethylene material gas pipes in the whole process, and shortens the length of the gas inlet pipeline to avoid ozone reaction loss; the clamping sleeve joint is made of polyvinylidene fluoride materials, so that ozone adsorption loss is avoided; and a permalloy shielding cover is covered on the optical signal sensing plate to reduce signal fluctuation of the photoelectric tube caused by electromagnetic interference. The overall stability of the analyzer is improved by the above measures.
Compared with the prior art, the ozone concentration analyzer has the advantages of high measurement accuracy and high stability.
Drawings
FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present utility model.
Fig. 2 is a schematic diagram of a core detection module according to an embodiment of the utility model.
Fig. 3 is a schematic diagram of a gas circuit module according to an embodiment of the utility model.
Fig. 4 is a schematic diagram of a signal processing module according to an embodiment of the utility model.
Detailed Description
The utility model will be further described with reference to the drawings and examples.
As shown in fig. 1, this embodiment discloses an air ozone concentration analyzer based on ultraviolet absorption method, including a core detection module 1, a gas circuit module 2, a signal processing module 3 installed in the same chassis, wherein:
as shown in fig. 2, the core detection module 1 includes a housing, bases are respectively fixed at left and right end positions in the housing, a reaction chamber 6 is installed between the bases, the reaction chamber 6 is a borosilicate glass tube which is axially horizontal left and right, two end pipe orifices of the reaction chamber 6 are respectively communicated with the bases at corresponding positions, a gas input port 9 is installed at the bottom of the base at the right end, a gas output port 7 is installed at the bottom of the base at the left end, and the gas input port 9 and the gas output port 7 are respectively communicated with corresponding end pipe orifices of the reaction chamber 6 through respective corresponding inside of the base. The base at the right end is provided with an ultraviolet light source 11, the ultraviolet light source 11 is a mercury lamp with a shell doped with titanium dioxide, the base at the right end is provided with a light passing hole communicated with the inside of the base, a narrow-band bandpass filter 8 is arranged in the light passing hole, the center wavelength of the narrow-band bandpass filter is 254nm, the half bandwidth is 10nm, and light emitted by the ultraviolet light source 11 enters the light passing hole, and enters the reaction chamber 6 through the inside of the right end base after being filtered by the narrow-band bandpass filter 8 in the light passing hole. The base at the right end is also provided with a heating module 10 and a plurality of temperature sensors, the temperature sensors respectively collect the temperatures of the ultraviolet light source 11, the reaction chamber 6 and the inside of the case, and the heating module 10 heats the ultraviolet light source 11 based on the temperatures collected by the temperature sensors, so that closed-loop temperature control is formed to maintain the temperature of the ultraviolet light source 11 in a stable range. The base at the left end is provided with an optical signal sensing board, the optical signal sensing board is provided with a photoelectric tube 5, the photoelectric tube 5 is arranged inside the left end base, the left end base is also connected with a permalloy shielding cover 4, and the permalloy shielding cover 4 covers the optical signal sensing board.
As shown in fig. 3, the air path module includes a sampling port, a calibration port, an air outlet, an air pump 14, an ozone scrubber 16, a particulate filter 18, a first three-way solenoid valve 15, a second three-way solenoid valve 19, a three-way joint 17, and a flow limiting hole 13. The sampling port is connected with the air inlet of the particulate filter 18, the air outlet of the particulate filter 18 is connected with one inlet of the second three-way electromagnetic valve 19, the calibration port is connected with the other inlet of the second three-way electromagnetic valve 19, the outlet of the second three-way electromagnetic valve 19 is connected with the inlet of the three-way joint 17, one outlet of the three-way joint 17 is connected with the air inlet of the ozone scrubber 16, the other outlet of the three-way joint 17 is connected with one inlet of the first three-way electromagnetic valve 15, the air outlet of the ozone scrubber 16 is connected with the other inlet of the first three-way electromagnetic valve 15, the outlet of the first three-way electromagnetic valve 15 is connected with the gas input 9 of the right end base, a gas flow sensor is arranged on a pipeline between the first three-way valve 15 and the gas input 9, the gas output 7 of the left end base is connected with the air inlet of the air pump 14 through the flow limiting hole 13, and the air outlet of the air pump 14 is connected with the air outlet.
As shown in fig. 4, the signal processing module 3 includes a collecting board 20 and a main control board 21, the temperature sensor and the gas flow sensor are respectively connected with the signal input end of the collecting board 20, the signal output end of the collecting board 20 is connected with the signal input end of the main control board, and the signal output end of the optical signal sensing board is connected with the signal input end of the main control board.
In this embodiment, the gas circuit module is responsible for carrying out particulate matter filtration with the gas that awaits measuring and then carrying to the reaction chamber to guarantee that the velocity of flow is stable. The air pump 14 is a diaphragm air pump, has a maximum vacuum of-90 kPa, and can be used for a long period of time in a low pressure environment. The three-way joint 17 uses polyvinylidene fluoride material to avoid ozone adsorption loss. The flow limiting hole 13 is physically limited in flow, and is stable and undisturbed. The three-way electromagnetic valves 15 and 19 are made of polytetrafluoroethylene materials, so that oxidation corrosion in the operation process can be avoided. Ozone scrubber 16 (using a platinum cerium two-component catalyst) has an ozone scrubbing rate of greater than 99.8%. The particulate filter 18 uses a polytetrafluoroethylene filter membrane of 3 μm or less. The gas circuit module is connected with all parts by using polytetrafluoroethylene gas pipes in the whole course, and the length of a gas inlet pipeline is shortened to avoid ozone reaction loss; and further improves the overall stability of the analyzer. Because the light intensity of the mercury lamp is not always unchanged, the ozone scrubber 16 is matched with a three-way electromagnetic valve to carry out cycle rotation measurement on the gas to be measured, and the specific process is that the first three-way electromagnetic valve 15 is switched every 6 seconds. The sampling port air path passes through the particulate filter 18, so that the air path is prevented from being blocked by particulate matters in the air and the measurement result is prevented from being influenced.
Gas enters the reaction chamber 6 from the gas inlet 9; the ultraviolet light source 11 is fixed on the fixing seat by using a jackscrew, and stray light is further filtered by the ultraviolet band light source through the narrow-band bandpass filter 8 to irradiate the reaction chamber 6; the energy of 254nm wave band light absorbed by the gas to be detected causes the light intensity attenuation of the wave band; finally, the gas to be measured flows out from the gas outlet 7; the photoelectric tube 5 continuously detects the light intensity of 254nm wave band of the ultraviolet light source 11, and converts the light intensity into signals through the optical signal sensing board and transmits the signals to the main control board. The acquisition board 20 converts analog signals such as cavity heating temperature, temperature in the case, gas path flow and the like into digital signals and sends the digital signals to the main control board 21; the optical signal sensing board converts the signals read by the photoelectric tube and sends the signals to the main control board 21; the main control board 21 performs concentration calculation according to the transmitted data and the written algorithm, and finally sends the calculated concentration to a screen for display.
The embodiments of the present utility model are merely described in terms of preferred embodiments of the present utility model, and are not intended to limit the spirit and scope of the present utility model, and those skilled in the art should make various changes and modifications to the technical solution of the present utility model without departing from the spirit of the present utility model, and the technical content of the present utility model is fully described in the claims.
Claims (7)
1. The air ozone concentration analyzer based on the ultraviolet absorption method comprises a core detection module, a gas circuit module and a signal processing module, and is characterized in that the core detection module comprises an ultraviolet light source, a reaction chamber, a narrow-band bandpass filter and an optical signal sensing plate with a photoelectric tube, wherein the ultraviolet light source is a mercury lamp with a shell doped with titanium dioxide, and the center wavelength of the narrow-band bandpass filter is 254nm and the half bandwidth is 10nm; the gas circuit module conveys gas to be detected into the reaction chamber, light emitted by the ultraviolet light source enters the reaction chamber through the narrow-band bandpass filter, 254nm wave band light is formed in the reaction chamber, 254nm wave band light energy is absorbed by the gas to be detected to enable light intensity of the 254nm wave band light to be attenuated, the light intensity attenuated 254nm wave band light is sensed by the light signal sensing plate and an electric signal is generated, and the electric signal generated by the light signal sensing plate is sent into the signal processing module.
2. The air ozone concentration analyzer based on the ultraviolet absorption method according to claim 1, wherein the reaction chamber is a borosilicate glass tube.
3. The ultraviolet absorption method-based air ozone concentration analyzer according to claim 1, wherein the optical signal sensing plate is provided with a permalloy shielding cover, and the permalloy shielding cover covers the outside of the optical signal sensing plate.
4. The air ozone concentration analyzer based on the ultraviolet absorption method according to claim 1, wherein the core detection module further comprises a closed-loop temperature control unit, the closed-loop temperature control unit comprises a heating module and a temperature sensor, the temperature of the ultraviolet light source is collected by the temperature sensor, and the ultraviolet light source is heated by the heating module based on the temperature collected by the temperature sensor, so that the temperature of the ultraviolet light source is maintained in a stable range.
5. The air ozone concentration analyzer based on the ultraviolet absorption method according to claim 1, wherein the air path module comprises a sampling port, a calibration port, an exhaust port, an air pump, an ozone scrubber, a particulate matter filter, a first three-way electromagnetic valve, a second three-way electromagnetic valve and a three-way joint, the reaction chamber is connected with a gas input port and a gas output port, the sampling port is connected with an air inlet of the particulate matter filter, an air outlet of the particulate matter filter is connected with one inlet of the second three-way electromagnetic valve, the calibration port is connected with the other inlet of the second three-way electromagnetic valve, an outlet of the second three-way electromagnetic valve is connected with an inlet of the three-way joint, the other outlet of the three-way joint is connected with one inlet of the first three-way electromagnetic valve, an air outlet of the ozone scrubber is connected with the other inlet of the first three-way electromagnetic valve, an outlet of the first three-way electromagnetic valve is connected with a gas input port of the reaction chamber, an air inlet of the air pump is connected with a gas output port of the reaction chamber, and an air outlet of the air pump is connected with the air exhaust port.
6. The ultraviolet absorption method-based air ozone concentration analyzer according to claim 5, wherein the gas circuit module further comprises a limiting hole, and the gas output port of the reaction chamber is connected with the gas inlet of the gas pump through the limiting hole.
7. The air ozone concentration analyzer based on the ultraviolet absorption method according to claim 1, wherein the signal processing module comprises a collecting board and a main control board, a signal output end of the collecting board is connected with a signal input end of the main control board, and a signal output end of the optical signal sensing board is connected with a signal input end of the main control board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320091801.8U CN219777484U (en) | 2023-01-31 | 2023-01-31 | Air ozone concentration analyzer based on ultraviolet absorption method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320091801.8U CN219777484U (en) | 2023-01-31 | 2023-01-31 | Air ozone concentration analyzer based on ultraviolet absorption method |
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| Publication Number | Publication Date |
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| CN219777484U true CN219777484U (en) | 2023-09-29 |
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| CN202320091801.8U Active CN219777484U (en) | 2023-01-31 | 2023-01-31 | Air ozone concentration analyzer based on ultraviolet absorption method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118150505A (en) * | 2024-05-07 | 2024-06-07 | 南京市计量监督检测院 | Ultraviolet nitrogen oxide analyzer with self-calibration function |
-
2023
- 2023-01-31 CN CN202320091801.8U patent/CN219777484U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118150505A (en) * | 2024-05-07 | 2024-06-07 | 南京市计量监督检测院 | Ultraviolet nitrogen oxide analyzer with self-calibration function |
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