CN209784181U - Gas shooting detection system - Google Patents
Gas shooting detection system Download PDFInfo
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- CN209784181U CN209784181U CN201920521626.5U CN201920521626U CN209784181U CN 209784181 U CN209784181 U CN 209784181U CN 201920521626 U CN201920521626 U CN 201920521626U CN 209784181 U CN209784181 U CN 209784181U
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Abstract
the utility model provides a gaseous detecting system that shoots, include: the mixed gas regulating device comprises a flow regulator, an inert gas humidity generator, a gas mixer, a gas supply bottle to be measured and an inert gas supply bottle; the gas chamber device comprises a gas absorption detection cell; the gas inlet of the gas chamber device is connected with the gas outlet of the mixed gas adjusting device; the gas absorption detection cell comprises a light inlet hole, a white cell structure, a light outlet hole and a camera shooting port, wherein light path converters are arranged at the light outlet hole and the camera shooting port; a light source; a spectrometer; the shooting device comprises a filter and a camera, wherein the filter comprises a plurality of filter pieces arranged on filter wheels, and the shooting device is connected with a shooting port of the camera. The utility model discloses a gaseous detecting system of shooing can also realize the gaseous detection to the polluted gas of different concentration and different humidity, helps constructing the polluted gas and shoots the detection data model.
Description
Technical Field
The utility model relates to a polluted gas concentration detection's technical field particularly, relates to gaseous detecting system that shoots.
Background
SO2(sulfur dioxide), also known as sulfurous anhydride, is one of the major atmospheric pollutants. SO (SO)2The air is colorless and the density of the air is higher than that of the polluted air, so that the air is mainly harmful to human bodies because the polluted air is inhaled into the lung to cause respiratory tract stimulation and burning sensation and damage the health of the human bodies; the harmful effects on the natural environment include acidification, smog, and damage to sensitive ecosystems. SO (SO)2It can also cause air quality degradation, primarily by the resulting scattering and absorption of solar energy, affecting the earth's atmospheric aerosol radiation budget.
For SO at present2Various detection methods are used, such as ultraviolet fluorescence SO2The monitor mainly adopts optical and electronic technologies, has high requirements on sampling technology and low detection efficiency, and cannot meet the requirements of modern technology on high efficiency; there are also a number of standard methods for correlation assays, SO2The standard method for measuring the gas is mainly formaldehyde solution absorption-pararosaniline hydrochloride spectrophotometry, and has the main defects of low detection rate and complex operation; at present, a few researches are carried out to detect SO by shooting with an ultraviolet camera2for example, the Chinese utility model with publication number CN205067360U discloses an SO2The gas imaging telemetering device calculates SO by imaging a target area through an ultraviolet-visible light camera and performing spectrum acquisition on an ultraviolet spectrometer2Concentration, but in reality the polluting gas is not pure SO2But has mixed gas with certain temperature and humidity, so that the establishment of a data model is difficult; and the device is onlyAn ultraviolet camera with a central wavelength of 300nm is adopted, so that the detection accuracy is obviously reduced.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main aim at provides gaseous detecting system that shoots to shoot among the solution prior art and detect gaseous being difficult to carry out the technical problem of the establishment of data model of pollution.
In order to achieve the above object, the utility model provides a gaseous detecting system that shoots. The gas shooting detection system comprises
The mixed gas regulating device comprises a flow regulator, an inert gas humidity generator, a gas mixer, a gas supply bottle to be measured and an inert gas supply bottle;
The gas chamber device comprises a gas absorption detection cell; the gas inlet of the gas chamber device is connected with the gas outlet of the mixed gas adjusting device; the gas absorption detection cell comprises a light inlet hole, a white cell structure, a light outlet hole and a camera shooting port, wherein light path converters are arranged at the light outlet hole and the camera shooting port;
the light source is connected with the light inlet hole through a first collimation leading-in mirror and a first optical fiber;
The spectrometer is connected with the light outlet hole through a second collimation lead-in mirror and a second optical fiber;
The shooting device comprises a filter and a camera, wherein the filter comprises a plurality of filter pieces arranged on filter wheels, and the shooting device is connected with a shooting port of the camera.
The utility model discloses a gaseous detecting system of shooing is based on Lambert-beer law to the camera is detecting instrument, utilizes the characteristic of gaseous pollutant absorption characteristic wavelength's light, adopts a plurality of filter lens pieces to shoot the weight calculation, shoots the concentration that obtains gaseous pollutant under each environmental condition with the camera inversion, and audio-visual gaseous pollutant's concentration variation of observing is simple in structure, and whole device simple structure can realize quick, high-efficient and accurate detection, provides effectual technical parameter and means for shooting detection and atmospheric environment improvement. Wherein, the filter lens comprises a plurality of filter lens pieces, and it is showing the promotion to detect the precision to combine the filter wheel to carry out automatic switch-over, realize gaseous pollutants's quick shooting and detect. The utility model discloses a gaseous detecting system of shooing can also realize the gaseous detection to the polluted gas of different concentration and different humidity, helps constructing the polluted gas and shoots the detection data model.
further, the inert gas supply bottle, the flow regulator, the inert gas humidity generator and the gas mixer are connected in sequence. The flow rate of the humidified inert gas is difficult to adjust, and therefore, the concentration of the contaminant gas in the resulting mixed gas can be accurately controlled by performing humidification after the flow rate of the inert gas is determined. The mode of humidifying the inert gas and mixing the inert gas can effectively reduce the dissolution of the polluted gas and is beneficial to stabilizing the concentration of the polluted gas in the obtained mixed gas. Wherein the flow regulator simultaneously regulates the flow of the contaminated gas and the inert gas.
Further, the gas supply bottle to be measured is SO2And (4) supplying the bottles. SO (SO)2The high-efficient detection always be the technical problem that the contaminated gas detection field is difficult to attack and is restrained and urgent need is solved, adopt the utility model discloses a detection system is shot to gas, can realize the SO to different concentration and different humidity2Is helpful for building SO2The shooting detection data model provides effective technical parameters and means for shooting detection and atmospheric environment management.
Further, the number of the filter lenses is 4, and the corresponding wave bands are 270nm, 280nm, 300nm and 310nm respectively. SO (SO)2The four wave bands have the maximum absorption sensitivity, so that the detection precision can be obviously improved by comprehensively detecting through the four filter lenses.
Furthermore, the filter lens also comprises a filter lens with a wave band of 340 nm. SO (SO)2There is basically no absorption at the wavelength above 340nm, therefore, by combining the filter lens of 340nm band, the interference of other interference and therefore the substance such as particulate matter can be eliminated, and the detection precision is further improved significantly.
Further, the gas absorption detection cell has a multiple-turn white cell structure, the optical path length is 4.2m, the size is 400 × 75 × 50mm, and the gas volume is 362 mL. The gas absorption detection cell shouldHas the characteristics of small volume and long optical path, and is used for testing SO by adopting a gas absorption detection cell with the parameters2in the process, the accuracy of shooting detection can be obviously improved.
Further, the light source is an ultraviolet light source, a visible light source or an infrared light source, and the camera is an ultraviolet camera, a visible light camera or an infrared camera. The utility model has the advantages of simple structure, convenient operation, the practicality is wide, can be applicable to the multiple polluted gas that the absorption characteristic is different.
Further, the inert gas supply bottle is N2(Nitrogen) was supplied to the bottle. Compared with inert gases such as helium, argon and the like and other inert gases which are not in the same wave band with the light absorbed by pollutants, N2Not only is inexpensive and readily available, but also N2The natural environment can be simulated, and the practicability of the detection data is improved.
Further, the air chamber device also comprises a pressurizer and an air pressure monitor. Therefore, the device not only can simulate pollutants in environments with different pressures, but also can detect the air tightness of the gas absorption detection cell.
Further, the gas chamber device also comprises a heater and a temperature monitor. Therefore, pollutants in different temperature environments can be simulated.
It can be seen that, the utility model discloses a gaseous detection system that shoots simple structure can realize quick, high-efficient and accurate detection to the gaseous pollutants of different concentration and different humidity, helps constructing the gaseous pollutants and shoots the detection data model, provides effectual technical parameter and means for shooting detection and atmospheric environment improvement.
the present invention will be further described with reference to the accompanying drawings and the detailed description. Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
drawings
The accompanying drawings, which form a part of the disclosure, are included to assist in understanding the disclosure, and the description provided herein and the accompanying drawings, which are related thereto, are intended to explain the disclosure, but do not constitute an undue limitation on the disclosure. In the drawings:
Fig. 1 is a schematic structural view of the gas shooting detection system of the present invention.
Fig. 2 is a view of the gas absorption detection cell of the gas shooting detection system according to the present invention.
Fig. 3 is a view of the gas absorption detection cell of the gas shooting detection system according to another direction of the present invention.
FIG. 4 shows the test results of the dry mixed gas at 25 ℃ under different concentrations, wherein the wavelength ranges of the filter lens corresponding to curves a-e are respectively 280nm, 270nm, 300nm, 310nm and 340 nm.
FIG. 5 is a dry, 1308mg/m concentration3The test results of the mixed gas at different temperatures.
FIG. 6 shows the temperature at 25 ℃ and the concentration at 1308mg/m3The test results of the mixed gas under different humidity.
FIG. 7 shows the dried sample at 25 ℃ and a concentration of 200mg/m3The ultraviolet camera of the mixed gas takes a picture.
FIG. 8 shows the dried sample at 25 ℃ and a concentration of 600mg/m3The ultraviolet camera of the mixed gas takes a picture.
FIG. 9 shows the results of drying at 25 ℃ and a concentration of 1000mg/m3The ultraviolet camera of the mixed gas takes a picture.
FIG. 10 shows the dry, 25 ℃ temperature and 1400mg/m concentration3the ultraviolet camera of the mixed gas takes a picture.
FIG. 11 shows the results of drying at 25 ℃ and a concentration of 1800mg/m3The ultraviolet camera of the mixed gas takes a picture.
Fig. 12 shows the stability test results of the uv spectrometer of the gas imaging detection system.
Fig. 13 shows the stability test results of the uv camera of the gas detection system.
FIG. 14 shows the repeatability of the UV spectrometer of the gas imaging detection system.
Fig. 15 shows the results of the repeatability tests of the uv camera of the gas detection system.
The relevant references in the above figures are:
11-flow regulator, 12-inert gas humidity generator, 13-gas mixer, 14-gas supply bottle to be measured, 15-inert gas supply bottle, 2-gas absorption detection cell, 21-light inlet hole, 22-light outlet hole, 23-camera shooting port, 24-light path converter, 25-gas inlet hole, 26-gas outlet hole, 27-connecting port, 31-heater, 32-temperature monitor, 41-pressurizer, 42-air pressure monitor, 51-light source, 52-first collimation leading-in lens, 53-first optical fiber, 61-spectrometer, 62-second collimation leading-in lens, 63-second optical fiber, 71-filter lens, 72-camera, 73-filter lens wheel and 8-computer.
Detailed Description
The present invention will be described more fully with reference to the accompanying drawings. Those of ordinary skill in the art will be able to implement the invention based on these descriptions. Before the present invention is described with reference to the accompanying drawings, it is to be noted that:
The technical solutions and features provided in the present invention in each part including the following description may be combined with each other without conflict.
Moreover, references to embodiments of the invention in the following description are generally only to be considered as examples of the invention, and not as all embodiments. Therefore, all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention shall fall within the protection scope of the present invention.
With respect to the terms and units of the present invention. The terms "comprising," "having," and any variations thereof in the description and claims of this invention and the related sections are intended to cover non-exclusive inclusions.
Fig. 1 is a schematic view of the gas shooting detection system of the present invention. As shown in fig. 1, the gas shooting detection system comprises a mixed gas adjusting device, a gas chamber device, a light source 51, a spectrometer 61 and a shooting device, wherein,
The mixed gas adjusting device comprises a flow regulator 11, an inert gas humidity generator 12, a gas mixer 13, a gas supply bottle 14 to be detected and an inert gas supply bottle 15; the inert gas supply bottle 15, the flow regulator 11, the inert gas humidity generator 12, and the gas mixer 13 are connected in this order.
The gas cell device includes a gas absorption detection cell 2, a heater 31 and a temperature monitor 32 that control the temperature of the mixed gas in the gas absorption detection cell 2, and a pressurizer 41 and a pressure monitor 42 that control the pressure of the mixed gas in the gas absorption detection cell 2. The air inlet 25 of the air chamber device is connected with the air outlet of the mixed gas adjusting device. As shown in fig. 2-3, the gas absorption detection cell 2 is a rectangular parallelepiped, and has a white cell structure with multiple turns inside, an exhaust port 26 and an air inlet 25 are provided at the upper part, a light inlet 21 and a light outlet 22 are provided at the side with a smaller area, a camera shooting port 23 is provided at one side with a larger area, a light path converter 24 is provided at the light outlet 22 and the camera shooting port 23, and a connection port 27 matched with the temperature monitor 32 and the air pressure monitor 42 is provided at the other side with a larger area. The gas absorption detection pool 2 with the structure is simple in structure, and can realize gas absorption, gas shooting, light entering and exiting and gas temperature and pressure regulation and control at the same time.
The light source 51 is connected with the light inlet 21 through a first collimation introducing mirror 52 and a first optical fiber 53;
the spectrometer 61 is connected with the light outlet 22 through a second collimation introducing mirror 62 and a second optical fiber 63;
The shooting device comprises a filter 71 and a camera 72, the filter 71 comprises a plurality of filter lenses arranged on a filter wheel 73, and the shooting device is connected with the camera shooting port 23. The filter wheel 73 is an AFW50-7 filter wheel 73 by apogee instruments ltd, usa. The filter wheel 73 is controlled by the computer 8 and can automatically switch the filter lenses with the required wave bands.
The light source 51 is an ultraviolet light source 51 (such as a deuterium light source), a visible light source 51 (such as a tungsten light source), or an infrared light source 51 (such as an LED lamp or a silicon carbide light source), and the camera 72 is an ultraviolet camera, a visible light camera, or an infrared camera.
Specifically, the gas shooting detection system is based on ultraviolet absorption test SO2a gas imaging detection system for concentration, correspondingly, the gas supply bottle 14 to be measured is SO2A supply bottle, the inert gas supply bottle 15 is N2The number of the filter lenses is 5, the corresponding wave bands are 270nm, 280nm, 300nm, 310nm and 340nm respectively, the optical path length of the gas absorption detection cell 2 is 4.2m, the size is 400 x 75 x 50mm, the gas volume is 362mL, the light source 51 is a deuterium lamp light source, the power is 30W, and the wave band is 210 and 400nm, so that ultraviolet light can be stably provided; the first optical fiber 53 can introduce ultraviolet light of 210-400nm into the gas absorption detection cell 2. When in use, SO is added2and N2The mixed gas adjusting device is introduced, the concentration and the humidity are adjusted, the mixed gas with the required concentration and humidity is obtained, the mixed gas with the speed of 600ml/min is introduced into the gas absorption detection pool 2, the gas inlet 25 is closed after the mixed gas lasts for more than 5min, then the required temperature and pressure are adjusted, the ultraviolet camera is opened, the temperature of a charge-coupled device (CCD) of the ultraviolet camera is set to be 50 ℃ below zero, the aperture value of the ultraviolet camera is F16, the exposure time is 1s, different filter lenses are switched, the ultraviolet light passing through the mixed gas is shot, 10 pictures are automatically shot under each exposure time of each filter lens, and the average value of the light intensity values after the gas absorbs the ultraviolet light is read on the computer 8 to be the shot detection result. After the measurement, the flow rate of N was adjusted to 600ml/min2And (5) introducing a gas absorption detection pool 2 to clean the instrument, and shutting down after introducing gas for 5 min.
The using effect is as follows:
(1) For different temperatures (5-45 ℃) and different concentrations (0-2617 mg/m)3) And mixed gas of different humidity (35-85% RH) were tested. By single-variable method, i.e. by using dry, 1308mg/m in temperature measurement3The mixed gas of (1) adopts dry mixed gas with the temperature of 25 ℃ in the concentration test, and adopts mixed gas with the temperature of 25 ℃ and the concentration of 1308mg/m in the humidity test3The mixed gas of (1). The test results are shown in FIGS. 4-6. The results show that with SO in the mixed gas2the concentration is increased, the tested absorbance value is also increased at the same time, and the fitting result R of the detection curve under each filter lens is obtained2Are all larger than 0.99; along with the increase of the temperature of the mixed gas, the absorbance value of the test is reduced, and the fitting result R of the detection curve under each filter lens2Are all larger than 0.95; and the measured absorbance value is basically unchanged along with the increase of the humidity of the mixed gas, which shows that the detection result of the detection system cannot be influenced by the humidity change of the mixed gas. Therefore, the detection system can well reflect the change of temperature and concentration, and the method is an accurate and reliable determination technology proved by high correlation. The photographs of the measurement results of the mixed gas with different concentrations are shown in fig. 7 to 11 (fig. 7 to 11 are each one selected from the corresponding 10 photographs).
(2) the stability of the gas shooting detection system is verified by adopting an ultraviolet spectrometer, and the method specifically comprises the following steps: drying at room temperature to obtain solution with concentration of 1308mg/m3After the mixed gas is introduced into the gas detection absorption cell, the valve is closed for 5min, and then the detection is performed, and the result is shown in fig. 12. As can be seen from FIG. 12, the absorbance of the mixed gas in the device for 280nm ultraviolet light reaches stability within 50s, and the detection result is stable and consistent within 5min after stabilization, which indicates that the gas shooting detection system has better air tightness and can realize detection within a period of time.
(3) Adopt the ultraviolet camera to shoot and detect and verify gas shooting detecting system's stability, specifically do: the detection results under the same conditions as in (2) are shown in fig. 13. As can be seen from FIG. 13, the detection result under the filter lens with the wave band of 280nm is stable and consistent within 30min, which proves that the gas shooting detection system can realize multiple stable detections under the condition of single gas distribution.
(4) The repeatability of the gas shooting detection system is verified by adopting an ultraviolet spectrometer, and the method specifically comprises the following steps: drying at room temperature to obtain solution with concentration of 1308mg/m3After the mixed gas is introduced into the gas detection absorption cell, the valve is closed for 5min, and then the detection is performed, and the detection is repeated for 4 times, and the result is shown in fig. 14. As can be seen from FIG. 14, 4 timesThe standard deviation of repeated experiments is 0.2%, and the gas shooting detection system is proved to have good repeatability and can realize setting under the same condition for many times.
(5) Adopt the ultraviolet camera to shoot and detect and verify the repeatability of detecting system is shot to gas, specifically do: drying at room temperature to obtain a dry extract with a concentration of 0-2617mg/m3(concentration interval 262 mg/m)3) After the mixed gas is introduced into the gas detection absorption cell, the valve is closed for 5min, the filter 71 with the wave band of 310nm is used for detection, 10 pictures are taken for each concentration, the average value is taken, and the verification is repeated for 3 times, and the result is shown in fig. 15. As can be seen from FIG. 15, in 3 repeated experiments under each concentration, the standard deviation is less than 0.5%, which proves that the detection system can realize stable detection for multiple times and has high accuracy of detection results.
The principle of the test is as follows:
When light emitted from the light source 51 passes through the mixed gas, the light intensity is attenuated due to the absorption of the light by the gas to be measured, and the attenuation of the light intensity follows the lambert-beer law:
I(λ)＝I0(λ)×exp{-τ(λ,l)} (1)
In formula (1), I is the light intensity obtained at the wavelength λ, I0Is the initial light intensity before the light passes through the mixed gas, and τ is the optical length.
In the formula (2), L is the total path through which light passes, σ is the absorption coefficient, and c is the mixed gas concentration. Assuming that the mixed gas concentration is uniform in the route L, substituting the formula (2) into the formula (1) can obtain:
In the formula (3), ρ is the absorbance of the mixed gas, σλIs the absorption coefficient at the wavelength lambda.
Under the condition of no illumination, obtaining a background value recorded as Bg after the shooting of an ultraviolet camera; when the gas absorption detection pool 2 is pure inert gas, the shooting detection result is the contrast value of the mixed gas shot by the ultraviolet camera and is marked as Re; shooting a detection result of the mixed gas and recording the detection result as Rs; can be expressed as:
the contents of the present invention have been explained above. Those of ordinary skill in the art will be able to implement the invention based on these descriptions. Based on the above-mentioned contents of the present invention, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention.
Claims (10)
1. gaseous detecting system of shooing, its characterized in that: comprises that
The mixed gas adjusting device comprises a flow regulator (11), an inert gas humidity generator (12), a gas mixer (13), a gas supply bottle (14) to be detected and an inert gas supply bottle (15);
The gas chamber device comprises a gas absorption detection cell (2); the air inlet (25) of the air chamber device is connected with the air outlet of the mixed gas adjusting device; the gas absorption detection cell (2) comprises a light inlet hole (21), a white cell structure, a light outlet hole (22) and a camera shooting port (23), and light path converters (24) are arranged at the light outlet hole (22) and the camera shooting port (23);
The light source (51), the said light source (51) and the said light inlet hole (21) are connected through the first collimation introducing mirror (52) and first optic fibre (53);
the spectrometer (61), the spectrometer (61) is connected with the light outlet hole (22) through a second collimation leading-in mirror (62) and a second optical fiber (63);
Shoot the device, including filter (71) and camera (72), filter (71) are including locating a plurality of filter lens pieces on filter wheel (73), shoot the device with camera shoots mouthful (23) and is connected.
2. The gas capture detection system of claim 1, wherein: the inert gas supply bottle (15), the flow regulator (11), the inert gas humidity generator (12) and the gas mixer (13) are connected in sequence.
3. The gas capture detection system of claim 1, wherein: the gas to be measured is supplied to the bottle (14) in SO2And (4) supplying the bottles.
4. the gas capture detection system of claim 3, wherein: the number of the filter lenses is 4, and the corresponding wave bands are 270nm, 280nm, 300nm and 310nm respectively.
5. The gas capture detection system of claim 4, wherein: and the filter lens with the wave band of 340nm is also included.
6. The gas capture detection system of claim 3, wherein: the gas absorption detection cell (2) has a multiple-turn white cell structure, the optical path length is 4.2m, the size is 400 x 75 x 50mm, and the gas volume is 362 mL.
7. The gas capture detection system of claim 1, wherein: the light source (51) is an ultraviolet light source, a visible light source or an infrared light source, and the camera (72) is an ultraviolet camera, a visible light camera or an infrared camera.
8. The gas capture detection system of claim 1, wherein: the inert gas supply bottle (15) is N2And (4) supplying the bottles.
9. The gas capture detection system of claim 1, wherein: the air chamber device further comprises a pressurizer (41) and a pressure monitor (42).
10. The gas capture detection system of claim 1, wherein: the gas cell device further comprises a heater (31) and a temperature monitor (32).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109975224A (en) * | 2019-04-17 | 2019-07-05 | 西南交通大学 | Gas shot detection system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109975224A (en) * | 2019-04-17 | 2019-07-05 | 西南交通大学 | Gas shot detection system |
| CN109975224B (en) * | 2019-04-17 | 2024-04-05 | 西南交通大学 | Gas shooting detection system |
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