Flue gas imaging device fusing ultraviolet light and visible light

Abstract

The utility model discloses a smoke imaging device fusing ultraviolet ray and visible light, which comprises an ultraviolet detection module, a visible light detection module and a signal control module, the ultraviolet detection module comprises an ultraviolet telephoto lens, a shading cylinder, an ultraviolet camera and an optical filter device, and the shading cylinder is arranged at the front end of the ultraviolet telephoto lens; the visible light detection module comprises a visible light telephoto lens matched with the ultraviolet telephoto lens and a visible light camera; the visible light detection module is located on one side of the ultraviolet detection module so that ultraviolet light and visible light can be in the same view field. And the signal control module is respectively connected with the ultraviolet detection module and the visible light detection module and is used for receiving information and processing data. The scheme provided by the utility model can solve the problems of poor portability, poor sensitivity, complex operation, limited precision, high cost, short detection distance and the like of the existing technology for monitoring pollutants such as sulfur dioxide, nitrogen oxide and the like, and has great application prospects and social significance.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of pollution gas ultraviolet imaging technology, concretely relates to a flue gas imaging device that fuses ultraviolet and visible light. BACKGROUND

[0002] Sulfur dioxide and nitrogen oxides are easily oxidized to generate acid mist or aerosol, resulting in acid rain, which seriously harms the ecological balance of the atmosphere and human health.

[0003] The existing technology for online monitoring of pollution gases (sulfur dioxide (SO2) and nitrogen oxides (NOx) and the like), i.e., real-time monitoring of pollutant concentration, optical remote sensing measurement technology, including laser radar (LiDAR), Fourier transform infrared absorption spectroscopy (FTIR), and online monitoring methods such as ultraviolet differential absorption spectroscopy (DOAS) and the like. Among them, laser radar is capable of measuring the concentration and distribution of pollutants in the atmosphere by emitting a laser beam into the atmosphere and receiving the reflected light signal, has high precision and high resolution, and can obtain three-dimensional distribution information of atmospheric pollution in real time. However, laser radar equipment is usually large and complex, making it difficult to achieve portability and mobility; and the cost is high, and maintenance and calibration are also complex.

[0004] Among them, the Fourier transform infrared absorption spectroscopy technology determines the concentration of pollutants by measuring the absorption characteristics of gas molecules to infrared light, can simultaneously measure multiple gas components, and has high sensitivity and selectivity. However, it also has the problems of large and complex equipment, which is not convenient for portable use, and has high requirements for environmental conditions such as temperature and humidity, which may affect the measurement results.

[0005] The ultraviolet differential absorption spectroscopy technology monitors the types and concentrations of pollutants in waste gas by continuously extracting, separating, pretreating and analyzing sulfur dioxide and nitrogen oxides pollutants, based on ultraviolet spectroscopy analysis, can monitor the concentration of SO2 and NOx and other pollutants in the atmosphere in real time, has high sensitivity and accuracy, and is suitable for monitoring in various environmental conditions; but when the flue gas composition is complex, the presence of other gases and particulate matter may interfere with the measurement results and affect the measurement accuracy, and the scattering and absorption of light by dust and other particulate matter may also reduce the intensity and quality of the measurement signal, and also has the disadvantages of high cost, large equipment, and the need for professional operation and maintenance.

[0006] Gas chromatography-mass spectrometry technology: gas chromatography separates gas mixtures into various components, and then mass spectrometers are used for detection and analysis. The disadvantages include expensive equipment, long analysis time, and the need for professional knowledge.

[0007] Sampling analysis method: by regularly collecting flue gas samples, sending them to the laboratory for analysis to determine the concentration of pollutants. Disadvantages include long monitoring period, inability to monitor in real time, high cost, etc.

[0008] Chemical analysis method: chemical analysis of collected flue gas samples to determine the types and concentrations of pollutants. Disadvantages include complex operation, long time-consuming, inability to monitor in real time, etc.

[0009] In summary, the existing flue gas pollution monitoring technology has the following general disadvantages: 1. High cost: including equipment cost, maintenance cost and labor cost; 2. Complex operation: requires professional skills and equipment operation experience; 3. Poor portability: laser radar, Fourier transform infrared absorption spectroscopy (FTIR) and other bulky devices; 4. Limited accuracy: affected by environmental conditions and sampling methods, the measurement results may not be accurate enough.

[0010] Therefore, there is an urgent need to develop a flue gas imaging device that can reduce cost, simplify operation, be easy to carry and improve measurement accuracy. Invention content

[0011] In the following, a brief summary of the embodiments of the present application is given in order to provide a basic understanding of some aspects of the present application. It should be understood that the following summary is not an exhaustive summary of the present application. It is not intended to determine the key or important parts of the present application, nor to limit the scope of the present application. Its purpose is only to give some concepts in a simplified form as a prelude to the more detailed description discussed later.

[0012] To solve the above technical problems, the present application provides a flue gas imaging device integrating ultraviolet and visible light, which comprises an ultraviolet detection module, a visible light detection module and a signal control module. The ultraviolet detection module comprises an ultraviolet long-focus lens, a light-shielding cylinder, an ultraviolet camera and a filter device. The output light path of the ultraviolet long-focus lens is coaxially installed with the filter of the filter device and the ultraviolet camera in sequence, and the light-shielding cylinder is placed at the front end of the ultraviolet long-focus lens. The visible light detection module comprises a visible light long-focus lens matched with the ultraviolet long-focus lens and a visible light camera. The visible light detection module is located on one side of the ultraviolet detection module to make the ultraviolet and visible light have the same field of view. The signal control module is connected with the ultraviolet detection module and the visible light detection module respectively for receiving information and data processing.

[0013] Further, the filter device comprises a filter rotating disc, a filter set arranged on the filter rotating disc, and a motor driving the filter rotating disc; the filter rotating disc is closely arranged between the ultraviolet camera and the ultraviolet long-focus lens; the motor is connected with the signal control module, and is used for receiving the control signal of the signal control module and driving the filter rotating disc to rotate and switch the filters of the filter set. The filter set comprises a set of replaceable filters, including a sulfur dioxide ultraviolet waveband filter, a nitrogen dioxide ultraviolet waveband filter, a nitrogen monoxide ultraviolet waveband filter, a reference filter, a sulfur dioxide ultraviolet waveband filter, a nitrogen dioxide ultraviolet waveband filter, and a nitrogen monoxide ultraviolet waveband filter, which are used for collecting target gas images; and the reference filter is used for reference images.

[0014] Further, the light-shielding cylinder is blackened as a whole and completely wraps the ultraviolet long-focus lens. The light-shielding cylinder is blackened as a whole to limit the angle of the light incident on the filter and avoid the interference of the incident light caused by the reflection of the light in the light-shielding cylinder, thereby reducing the shift of the central wavelength of the filter to the short-wave direction caused by the increase of the angle of the incident light.

[0015] Further, the signal control module further comprises a display screen, which is used for displaying the received information.

[0016] Further, except for the ultraviolet long-focus lens of the ultraviolet detection module, the visible light long-focus lens of the visible light detection module, and the display screen of the signal control module, the remaining parts are packaged in an outer shell, which is used for preventing the light from entering the device to cause interference.

[0017] In use, the signal control module is connected with the ultraviolet detection module and the visible light detection module, and the motor of the ultraviolet detection module is instructed by the signal control module to drive the filter rotating disc to rotate, so that the sulfur dioxide ultraviolet waveband filter, the nitrogen dioxide ultraviolet waveband filter, the nitrogen monoxide ultraviolet waveband filter, and the reference filter on the filter rotating disc are quickly switched, to achieve the functions of real-time removal of the background and real-time detection. The signal control module is also used for smoke concentration analysis and image fusion with the visible light image. The parts of the signal control module related to the software program are all existing technical solutions, and are not the improvement points of the present application, which will not be described in detail here.

[0018] Compared with the prior art, the application has the following advantages based on the ultraviolet and visible light imaging technology route: portability: the ultraviolet and visible light fusion is more simple and portable, and the dynamic trend of pollutants such as sulfur dioxide and nitrogen oxides can be observed with high spatial resolution; cost-effectiveness: compared with traditional monitoring equipment, the application uses an ultraviolet camera and a band-pass filter, and has relatively low cost, simple system structure, easy maintenance and operation, reduces the overall operation cost, and still ensures high precision and high sensitivity of the monitoring effect, so that the procurement and maintenance cost of the monitoring equipment can be reduced; long detection distance: through the high-resolution ultraviolet camera and the visible light camera matched with a long-focus lens, the detection of pollutants such as sulfur dioxide and nitrogen oxides can be realized at a distance of 2Km. In summary, the scheme of the application can solve the problems of poor portability, poor sensitivity, complex operation, limited precision, high cost and short detection distance of the existing sulfur dioxide and nitrogen oxide pollution monitoring technology, and has great application prospect and social significance. BRIEF DESCRIPTION OF DRAWINGS

[0019] The present application can be better understood by referring to the following description in conjunction with the accompanying drawings in which like or similar elements refer to like or similar parts throughout the several views, and in which:

[0020] Figure 1 is a perspective view of the smoke imaging device fusing ultraviolet and visible light of the embodiment of the present application; Figure One ;

[0021] Figure 2 is a sectional view of the smoke imaging device fusing ultraviolet and visible light of the embodiment of the present application;

[0022] Figure 3 is a side view of the smoke imaging device fusing ultraviolet and visible light of the embodiment of the present application;

[0023] Figure 4 is a schematic view of the filter device of the smoke imaging device fusing ultraviolet and visible light of the embodiment of the present application;

[0024] Figure 5 is a perspective view of the smoke imaging device fusing ultraviolet and visible light of the embodiment of the present application; Figure Two . DETAILED DESCRIPTION

[0025] Embodiments of the present application will be described below with reference to the accompanying drawings. The elements and features described in one drawing or one embodiment of the present application can be combined with the elements and features shown in one or more other drawings or embodiments. It should be noted that, for the purpose of clarity, the representation and description of components and processes that are irrelevant to the present application and known to those skilled in the art are omitted from the drawings and the description.

[0026] The embodiment of the present application provides a kind of UV-visible light fusion flue gas imaging device, based on UV-visible light imaging technical route, by obtaining the image of specific substance absorption, using Lambert Beer's law to invert specific substance concentration, for the emission monitoring of pollutants such as power plant, chemical plant, steel plant, cement plant, oil refinery, waste incineration plant, ship sulfur dioxide, nitrogen oxides, with high detection accuracy, high practicability, high time resolution, strong spatial resolution, can intuitively online obtain the two-dimensional distribution of pollution gas concentration in space and emission rate with time from analytical image, can effectively solve some defects and shortcomings of prior art, important role for monitoring environmental pollution.

[0027] Referring to Figures 1-5 The flue gas imaging device of the present application fuses ultraviolet and visible light, mainly including three parts: ultraviolet detection module 1, visible light detection module 2 and signal control module 3.

[0028] The ultraviolet detection module 1 includes an ultraviolet long-focus lens 11 responsible for collecting information, a light-shielding cylinder 12, an ultraviolet-visible light CMOS camera 13 (ultraviolet camera), a filter disc 14 and a motor 15. Referring to Figure 4 , a filter disc group of a set of replaceable filters is placed on the filter disc 14, and the filter disc group includes a sulfur dioxide ultraviolet band filter 15, a nitrogen dioxide ultraviolet band filter 16, a nitric oxide ultraviolet band filter 17 and a reference filter 18, respectively used to collect target gas images and reference images, and the motor 15 is responsible for rotating the filter disc 14 to switch the filters.

[0029] The light-shielding cylinder 12 in front of the ultraviolet long-focus lens 11 is blackened as a whole, so as to limit the angle of light incident on the filter and avoid the interference of incident light caused by the reflection of light in the light-shielding cylinder 12, thereby reducing the shift of the center wavelength of the filter to the short wave direction caused by the increase of the angle of incident light.

[0030] The connection mode of each part of the ultraviolet detection module 1 is that the filter disc carries a set of replaceable filters (sulfur dioxide ultraviolet band filter 15, nitrogen dioxide ultraviolet band filter 16, nitric oxide ultraviolet band filter 17, reference filter 18), which are tightly attached between the ultraviolet-visible light CMOS camera 13 and the ultraviolet long-focus lens 11. The light-shielding cylinder 12 is placed at the front end of the ultraviolet long-focus lens 11, and the whole light-shielding cylinder 12 is blackened to completely wrap the lens, so that high-precision image acquisition and analysis can be performed in the ultraviolet band.

[0031] The light-shielding cylinder 12 is blackened as a whole, the angle of the incident light is limited to within 10°, the reflection interference is reduced, the center wavelength of the filter is prevented from shifting, and the imaging accuracy is ensured.

[0032] The signal control module 3 connects the ultraviolet detection module 1 and the visible light detection module 2. The signal control module issues an instruction to the ultraviolet detection module 1 filter disc motor 15 to drive the filter disc 14 to rotate, so that the sulfur dioxide ultraviolet band filter 15, the nitrogen dioxide ultraviolet band filter 16, the nitric oxide ultraviolet band filter 17, and the reference filter 18 on the filter disc are quickly switched to achieve the functions of real-time removal and real-time detection of the background.

[0033] The visible light detection module 2 includes a visible light long-focus lens 21 matched with the ultraviolet long-focus lens 11 and a visible light CMOS camera 22 (visible light camera). The whole part is located on one side of the ultraviolet detection module 1, so as to ensure that the ultraviolet and visible light have the same field of view for convenient image fusion in the later stage.

[0034] The signal control module 3 is responsible for overall planning of each part, receiving information transmitted by each part, and performing the functions of ultraviolet image background removal and noise reduction, concentration analysis, and visible light image fusion. The signal control module 3 also includes a display screen 41 for displaying information.

[0035] Except for the display screen 41, the ultraviolet long-focus lens 11, and the matched visible light long-focus lens 21, the other parts of the device are packaged by the shell 5 to prevent light from entering the device and causing interference with the results.

[0036] In the ultraviolet detection module 1, the ultraviolet long-focus lens 11 is used to focus ultraviolet light and accurately collect the image of the target gas. The light-shielding cylinder 12 is blackened as a whole to limit the angle of the incident light, reduce reflection interference, and prevent the center wavelength of the filter from shifting. The ultraviolet-visible light CMOS camera 13 has high sensitivity and is dedicated to capturing images in the ultraviolet-visible light range. The filter disc 14 is equipped with a set of replaceable filters for collecting images of different wavelengths, and the motor drives the filter switching.

[0037] In the visible light detection module 2, the visible light long-focus lens 21 and the visible light CMOS camera 22 are matched with the ultraviolet lens to ensure the same field of view, facilitating image fusion.

[0038] The signal control module 3 is used for control of the filter disc 14 and the motor 15, and the filter disc is switched quickly by controlling the motor to remove the background interference in real time. In addition, the signal control module 3 is also used for overall control and data processing: receiving and processing information from the ultraviolet-visible light CMOS camera 13 and the visible light CMOS camera 22, performing background removal, noise reduction and concentration analysis on the ultraviolet image, and combining the visible light image to realize data fusion; meanwhile, the gas concentration analysis result is output after data analysis and processing.

[0039] Through the above hardware structure, combined with the ultraviolet-visible light imaging technology route, the image absorbed by the specific substance is obtained, and the specific substance concentration can be inversely calculated by using the Lambert-Beer law. The device can be used for emission monitoring of pollutants such as sulfur dioxide, nitrogen oxides, etc. in power plants, chemical plants, steel plants, cement plants, oil refineries, waste incineration plants, ships, etc. It has high detection accuracy, strong practicability, high time resolution, strong spatial resolution, can directly and online obtain the two-dimensional distribution of the concentration of the pollution gas in space and the emission rate over time from the analysis image, can effectively solve some defects and shortcomings of the prior art, and has an important role in monitoring environmental pollution.

[0040] Through the above scheme, based on the ultraviolet and visible light imaging technology route, compared with the prior art, the following advantages are obtained: 1. portability: the ultraviolet-visible light fusion is a more simple and portable imaging detection method, which can not only observe the dynamic trend of pollutants such as sulfur dioxide and nitrogen oxides, but also has high spatial resolution. 2. Non-contact detection: compared with the traditional ultraviolet differential optical absorption spectroscopy (DOAS) technology, which needs to sample and pretreat the flue gas, this technology can realize non-contact detection of pollutants such as sulfur dioxide and nitrogen oxides, reducing the operation complexity. 3. High sensitivity: based on the ultraviolet-visible light imaging technology route, the image absorbed by the specific substance is obtained, and the specific substance concentration can be inversely calculated by using the Lambert-Beer law, which can realize high sensitivity detection of the specific substance absorption and accurately quantitatively analyze the pollutant concentration in the flue gas. 4. Cost-effective: compared with the traditional monitoring equipment, this technology may have lower cost, which can reduce the procurement and maintenance cost of the monitoring equipment. 5. Multi-information acquisition: through the ultraviolet-visible light imaging fusion technology, the two-dimensional distribution of the concentration of the pollution gas in space and the emission rate over time can be directly and online obtained from the analysis image, which helps to more comprehensively understand the pollution situation. 6. Long detection distance: through the high-resolution ultraviolet camera and the visible light camera matched with the long-focus lens, the detection of pollutants such as sulfur dioxide and nitrogen oxides can be realized at a distance of 2Km.

[0041] In summary, this one ultraviolet visible light fusion flue gas imaging device can solve the existing sulfur dioxide, nitrogen oxides and other pollutants monitoring technology poor portability, poor sensitivity, complex operation, limited precision, high cost, short detection distance and other problems, has great application prospect and social significance.

[0042] In addition, in actual use, the ultraviolet detection module can also be used according to the needs of other implementation ways:

[0043] (1) The ultraviolet long-focus lens can be replaced by other focal length lenses, and different focal lengths can be selected according to application requirements to adapt to different observation distances and field of view requirements.

[0044] (2) The light shielding cylinder can also be made of different materials or coatings, such as nano material coatings to improve light absorption and further reduce reflection interference.

[0045] (3) The ultraviolet visible light CMOS camera can be replaced by an ultraviolet CCD camera or other high-sensitivity sensors to improve image quality and sensitivity.

[0046] (4) The filter disc can be replaced by a liquid crystal tunable filter (LCTF) to achieve fast and accurate wavelength selection without mechanical rotating parts, reducing the risk of mechanical failure of the system.

[0047] The signal control module can also be implemented in other ways according to the needs:

[0048] (1) The combination of the motor and the filter disc can be replaced by a grating tuner to achieve wavelength selection through grating tuning, avoiding mechanical rotation.

[0049] (2) The motor can be replaced by a stepper motor or a servo motor to improve the precision and speed of the filter switching.

[0050] In addition, the entire device can also be designed as a portable device, with modular design, each part can be flexibly combined and replaced, convenient to use in different field environments. The material of the shell can be replaced by lighter and better heat dissipation materials such as aluminum alloy or carbon fiber, enhancing the durability and portability of the device. In addition to ultraviolet visible light imaging, multispectral imaging technology can also be used to simultaneously capture images of multiple wavebands, achieving multi-parameter monitoring of different pollutants and improving the comprehensiveness of detection. At the same time, this scheme can be combined with a UAV platform, and the ultraviolet visible light imaging system can be installed on the UAV to realize rapid inspection of large areas, enhancing the flexibility and application range of the system.

[0051] Although the utility model has been disclosed through the description of the specific embodiments of the utility model above, it should be understood that all the above embodiments and examples are exemplary but not restrictive. Those skilled in the art can design various modifications, improvements or equivalents of the utility model within the spirit and scope of the appended claims. These modifications, improvements or equivalents should also be considered to be included in the protection scope of the utility model.

Claims

1. A smoke imaging device that fuses ultraviolet and visible light, characterized by: The application relates to a long-focus ultraviolet and visible light detection device. The device comprises an ultraviolet detection module, a visible light detection module and a signal control module, wherein the ultraviolet detection module comprises an ultraviolet long-focus lens, a light-shielding cylinder, an ultraviolet camera and a filter device, the light-shielding cylinder is arranged at the front end of the ultraviolet long-focus lens; the visible light detection module comprises a visible light long-focus lens matched with the ultraviolet long-focus lens and a visible light camera; the visible light detection module is arranged on one side of the ultraviolet detection module to make the ultraviolet light and the visible light have the same field of view; the signal control module is connected with the ultraviolet detection module and the visible light detection module respectively and is used for receiving information and data processing; The filter device comprises a filter rotating disc, a filter group arranged on the filter rotating disc and a motor for driving the filter rotating disc; the filter rotating disc is closely arranged between the ultraviolet camera and the ultraviolet long-focus lens; the motor is connected with the signal control module and is used for receiving the control signal of the signal control module and driving the filter rotating disc to rotate and switch the filters of the filter group.

2. The UV and visible light fused smoke imaging device of claim 1, wherein: The filter group comprises a sulfur dioxide ultraviolet wave band filter, a nitrogen dioxide ultraviolet wave band filter, a nitrogen monoxide ultraviolet wave band filter and a reference filter; the sulfur dioxide ultraviolet wave band filter, the nitrogen dioxide ultraviolet wave band filter and the nitrogen monoxide ultraviolet wave band filter are used for collecting target gas images; and the reference filter is used for reference images.

3. The UV and visible light fused smoke imaging device of claim 1, wherein: The light-shielding cylinder is blackened as a whole and completely wraps the ultraviolet long-focus lens.

4. The UV and visible light fused smoke imaging device of claim 1, wherein: The signal control module further comprises a display screen used for displaying the received information.

5. The UV and visible light fused smoke imaging device of claim 4, wherein: Except for the ultraviolet long-focus lens of the ultraviolet detection module, the visible light long-focus lens of the visible light detection module and the display screen of the signal control module, the rest parts are packaged in a shell.

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