CN102393375A - Passive gas imaging system - Google Patents
Passive gas imaging system Download PDFInfo
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- CN102393375A CN102393375A CN2011102478086A CN201110247808A CN102393375A CN 102393375 A CN102393375 A CN 102393375A CN 2011102478086 A CN2011102478086 A CN 2011102478086A CN 201110247808 A CN201110247808 A CN 201110247808A CN 102393375 A CN102393375 A CN 102393375A
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Abstract
The invention provides a passive gas imaging system, which comprises an infrared imaging system, a visible light imaging unit, a central processing unit and a display, and is characterized in that: the front end of the infrared imaging unit is provided with an infrared optical lens; the front end of the visible light imaging unit is provided with a visible light optical lens; output signals of the infrared imaging unit and the visible light imaging unit are connected with the central processing unit; the central processing unit is used for processing signals and overlapping a processed infrared image with a processed visible image; the display is connected with the output of the central processing unit, and is used for displaying an output result; the infrared imaging unit comprises an infrared light window, a tube shell, a non-refrigerating infrared focal plane array chip and an infrared imaging digital signal processing circuit board; the infrared light windows is provided with an infrared narrowband optical filter; and the penetration wavelength is equal to the absorbing wavelength of a gas to be detected. The passive gas imaging system is convenient to carry; and a laser is not required, so that the equipment size is reduced, and the cost is lowered.
Description
Technical field
The invention belongs to the infrared thermal imaging technique field, relate in particular to a kind of passive type gas imaging system based on the non-refrigerating infrared focal plane technology.
Background technology
In power industry, daily use chemicals industry, petrochemical industry, all can use various gases, so often need measurement gas to leak or gas concentration.For coloured gas that flavor is arranged, can qualitatively judge the position and the order of severity of leakage through vision or sense of smell, but, just must use apparatus measures for the gas of colorless and odorless.Under the situation of known leak point, can measure the concentration of gas easily with corresponding gas sensor.But because gas itself is colorless and odorless, if user and do not know leakage point wherein in advance then can't only confirm the leak position with gas sensor.
Passive type gas imaging technology based on the infrared focus plane technology is a kind of method of indirect measurement gas leakage point.
All objects can both to around radiated electromagnetic wave, the energy of radiation mainly concentrates near the centre wavelength, the temperature of object is high more, centre wavelength is more little, is inversely proportional to the absolute temperature of object.The radiation that centre wavelength is positioned at the 8-14 mu m range is called as heat radiation.Thermal infrared imager can change into heat with the infrared radiation that absorbs, and causes that the pixel of infrared focal plane array in the thermal imaging system heats up, and then the change in electric that temperature rise causes is outputed in the display device.If thermal infrared imager facing to targets such as pipeline, equipment, just can be found out the Temperature Distribution of object on display screen.Owing to be target object self emission IR, do not need thermal imaging system that light source initiatively is provided, therefore be called the passive type imaging.
Each gas all has the infrared absorption wavelength of its characteristic, such as sulfur hexafluoride (SF
6) can strong absorption the radiation of 10.56 μ m, and carbon dichloride (CCl
2) can strong absorption the radiation of 11.8 μ m.When pipeline, equipment etc. had gas to leak, near the concentration of gas leak source can be bigger, and far away more from leak source, then concentration is more little.
When the camera lens of thermal imaging system during just facing near the leak source regional; Can pass the gas of leakage from target (pipeline, the equipment etc.) infrared ray that sends; Therefore can be partially absorbed; The heat radiation energy that arrives the thermal infrared imager focal plane arrays (FPA) will lack when not having gas to leak, and the pixel temperature rise ratio that therefore causes is low when not having gas to leak.The degree varies appearance of gas absorption, the variation of pixel temperature rise is also different.Therefore can judge where target (pipeline, equipment etc.) has leakage through the distribution of temperature.
Announced in U.S.'s patent of invention 7649174 and utilized thermal infrared imager to detect SF in the power equipment
6The method that gas leaks, but used equipment is the refrigeration mode infrared focal plane array, needs special chilling unit and refrigerant, such as therefore Dewar flask and liquid nitrogen are not easy to long-time use.Such as large-scale substation, area is big, and equipment is many, and therefore require again needs a kind of equipment more easily to satisfy the demand of this respect to the daily detection of gas leakage carrying out.
Announced a kind of laser imaging SF in China's utility model patent 200820167479.8
6Gas leakage positioning system is integrated into a system the inside with laser instrument and thermal infrared imager, has reduced the volume of equipment to a certain extent, but still has needed LASER Light Source, and used a plurality of infrared lens, and cost is not low.
Summary of the invention
To above-mentioned shortcoming; The object of the present invention is to provide a kind of portable passive type gas infrared imaging system; Not only can realize charged noncontact, gas is intuitively formed images, and have characteristics highly sensitive, that volume is little, cost performance is high, can carry out colored eye-catching processing detected gas.
In order to solve the problems of the technologies described above, the invention provides a kind of passive type gas imaging system, comprising:
The infrared imaging unit; Front end is provided with infrared optical lens in said infrared imaging unit; On the said infrared window infrared narrow band filter is arranged, the housing of an infrared window and a sealing of encapsulation shell formation, non-refrigeration type infrared focal plane array chip places this enclosure; Be positioned on the focal plane of infrared optical lens; Infrared imaging digital signal processing circuit plate places closure casing outside, receive non-refrigeration type infrared focal plane array chip and pass the signal of coming through the encapsulation shell, and the signal after will handling outputs to CPU;
The visual light imaging unit is provided with the visible light optical lens at its front end, receive visible light through the visible light optical lens, and the signal that will handle outputs to CPU;
CPU is handled the signal of infrared imaging unit and the output of visual light imaging unit, and with infrared image of handling well and visible images stack;
Display, the output terminal of connection CPU shows its output result.
According to passive type gas imaging provided by the invention system, said uncooled infrared focal plane array chip at room temperature just can operate as normal, need not use additional equipment that it is cooled to liquid nitrogen temperature, so be called as non-refrigeration type.
Characteristics of the present invention have:
1, need not to use laser instrument, reduced the volume of equipment greatly, really realized portable.Simultaneously, there is not infringement infrared imaging chip because laser intensity crosses strong yet;
What 2, infrared imaging chip used is the non-refrigeration type infrared focal plane array, need not to be equipped with specially refrigeration plant and liquid nitrogen;
3, narrow band filter slice is realized on infrared window, rather than on infrared lens, realizes.Because the surface area of infrared window is much little compared with camera lens, coating process is much also simple, so cost reduces greatly.
Description of drawings
Through reading the detailed description of doing with reference to following accompanying drawing that non-limiting example is done, it is more obvious that other features, objects and advantages of the present invention will become:
Fig. 1 is based on the passive type gas imaging know-why block diagram of non-refrigerating infrared focal plane technology;
Fig. 2 is an infrared imaging cellular construction sketch.
Same or analogous Reference numeral is represented same or analogous parts in the accompanying drawing.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that embodiments of the invention are described in detail below.
Describe embodiments of the invention below in detail, the example of said embodiment is shown in the drawings, and wherein identical from start to finish or similar label is represented identical or similar elements or the element with identical or similar functions.Be exemplary through the embodiment that is described with reference to the drawings below, only be used to explain the present invention, and can not be interpreted as limitation of the present invention.
Disclosing of hereinafter provides many various embodiment or example to be used for realizing different structure of the present invention.Of the present invention open in order to simplify, hereinafter the parts and the setting of specific examples are described.Certainly, they only are example, and purpose does not lie in restriction the present invention.In addition, the present invention can be in different examples repeat reference numerals and/or letter.This repetition is in order to simplify and purpose clearly, itself not indicate the relation between various embodiment that discuss of institute and/or the setting.In addition; First characteristic of below describing second characteristic it " on " structure can comprise that first and second characteristics form the embodiment of direct contact; Can comprise that also additional features is formed on the embodiment between first and second characteristics, such first and second characteristics possibly not be direct contacts.
As shown in Figure 1; Be passive type gas imaging system implementation example according to the present invention; Comprise infrared imaging unit 1, visual light imaging unit 2, CPU 3, display 4; It is characterized in that the front end in said infrared imaging unit 1 is provided with infrared optical lens 5, the infrared light of test zone emission gets into infrared imaging unit 1 through said infrared optical lens 5; The front end of visual light imaging unit 2 is provided with visible light optical lens 6, and extraneous visible light gets into visual light imaging unit 2 through said visible light optical lens 6; The output signal of infrared imaging unit 1, visual light imaging unit 2 links to each other with CPU 3; 3 pairs of signals of CPU are handled; With infrared image of handling well and visible images stack, display 4 links to each other with the output of CPU 3, shows its output result.
In the present embodiment, said infrared optical lens 5 can be remote telephoto lens, by seeing through but the infra-red material that is not limited to 8～14 μ m process, can be germanium (Ge), silicon (Si), zinc sulphide (ZnS) or zinc selenide (ZnSe).
As shown in Figure 2, be infrared imaging unit 1 structure diagram of present embodiment.Said infrared imaging unit 1 comprises infrared window 11, shell 13, un-cooled infrared focal plane array chip 14, infrared imaging digital signal processing circuit plate 15.Infrared light incides on the un-cooled infrared focal plane array chip 14 through infrared window 11 after focusing on through infrared optical lens 5.On the said infrared window 11 infrared narrow band filter 12 is arranged; It sees through the absorbing wavelength that wavelength equals the probe gas of wanting; Infrared window 11 and the housing of encapsulation shell 13 through a sealing of bonding formation, inside is in vacuum state, and its inner pressure is less than 1000Pa.Non-refrigeration type infrared focal plane array chip 14 places said enclosure; Be positioned on the focal plane of infrared optical lens 5; Infrared imaging digital signal processing circuit plate 15 places closure casing outside; Receive non-refrigeration type infrared focal plane array chip 14 and pass the signal of coming, and the signal after will handling outputs to CPU 3 through the encapsulation shell.
The material of said infrared window 11 is germanium (Ge), silicon (Si), zinc sulphide (ZnS) or zinc selenide (ZnSe).Said narrow band pass filter 12 can be plated in the one side of infrared window, and also can be plated in its two sides, or not be plated on the infrared window 11, but independent a slice.Said non-refrigeration type infrared focal plane array chip 14 used thermo-sensitive materials are vanadium oxide (VOx) or polysilicon (a-Si), can pass through microelectron-mechanical processing technologys such as (MEMS) and make.Said infrared imaging digital signal processing circuit plate 15 can be the single or multiple lift circuit board; Also can utilize semiconductor processing technology, with non-refrigeration type infrared focal plane array chip 14 and infrared imaging digital signal processing circuit plate 15 integrated being produced on the same chip.
Though specify about example embodiment and advantage thereof, be to be understood that under the situation of the protection domain that does not break away from the qualification of spirit of the present invention and accompanying claims, can carry out various variations, replacement and modification to these embodiment.
In addition, range of application of the present invention is not limited to technology, mechanism, manufacturing, material composition, means, method and the step of the specific embodiment of describing in the instructions.From disclosure of the present invention; To easily understand as those of ordinary skill in the art; For the technology, mechanism, manufacturing, material composition, means, method or the step that have existed or be about to later on develop at present; Wherein they are carried out the corresponding embodiment cardinal principle identical functions of describing with the present invention or obtain identical substantially result, can use them according to the present invention.Therefore, accompanying claims of the present invention is intended to these technology, mechanism, manufacturing, material composition, means, method or step are included in its protection domain.
Claims (10)
1. passive type gas imaging system comprises:
The infrared imaging unit; Front end is provided with infrared optical lens in said infrared imaging unit; On the said infrared window infrared narrow band filter is arranged, the housing of an infrared window and a sealing of encapsulation shell formation, non-refrigeration type infrared focal plane array chip places this enclosure; Be positioned on the focal plane of infrared optical lens; Infrared imaging digital signal processing circuit plate places closure casing outside, receive non-refrigeration type infrared focal plane array chip and pass the signal of coming through the encapsulation shell, and the signal after will handling outputs to CPU;
The visual light imaging unit is provided with the visible light optical lens at its front end, receive visible light through the visible light optical lens, and the signal that will handle outputs to CPU;
CPU is handled the signal of infrared imaging unit and the output of visual light imaging unit, and with infrared image of handling well and visible images stack;
Display, the output terminal of connection CPU shows its output result.
2. system according to claim 1 is characterized in that, said infrared optical lens is remote telephoto lens.
3. system according to claim 1 is characterized in that, the material of said infrared optical lens is germanium (Ge), silicon (Si), zinc sulphide (ZnS) or zinc selenide (ZnSe).
4. system according to claim 1 is characterized in that, the material of said infrared window is germanium (Ge), silicon (Si), zinc sulphide (ZnS) or zinc selenide (ZnSe).
5. infrared window according to claim 4, its narrow band filter slice can be plated in the one side of infrared window, and also can be plated in its two sides, or not be plated on the infrared window, but independent a slice.
6. system according to claim 1 is characterized in that the pressure of said enclosure is less than 1000Pa.
7. system according to claim 1 is characterized in that, the used thermo-sensitive material of said non-refrigeration type infrared focal plane array is vanadium oxide (VOx) or polysilicon (a-Si).
8. system according to claim 1 is characterized in that, said infrared imaging unit comprises infrared window, shell, un-cooled infrared focal plane array chip, infrared imaging digital signal processing circuit plate.
9. system according to claim 1 is characterized in that, said infrared narrow band filter sees through the absorbing wavelength that wavelength equals the probe gas of wanting.
10. system according to claim 1 is characterized in that the enclosure interior of said sealing is in vacuum state.
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| CN103413395A (en) * | 2013-08-15 | 2013-11-27 | 北京声迅电子股份有限公司 | Intelligent smoke detecting and early warning method and device |
| CN104122235A (en) * | 2013-04-25 | 2014-10-29 | 北京格宝应用技术有限公司 | Detection device and method for olefin gas |
| CN104568806A (en) * | 2013-10-28 | 2015-04-29 | 上海巨哥电子科技有限公司 | Gas detection device |
| CN105527290A (en) * | 2015-12-31 | 2016-04-27 | 青岛市光电工程技术研究院 | All-time marine sulfur dioxide gas discharge remote measurement method and apparatus |
| CN106525726A (en) * | 2016-11-24 | 2017-03-22 | 西安交通大学 | Passive infrared imaging-based automobile exhaust visual real-time monitoring apparatus |
| CN109164057A (en) * | 2018-10-12 | 2019-01-08 | 北京环境特性研究所 | The infrared multi-spectral imaging remote sense monitoring system of chemical gas, device and method |
| CN110274889A (en) * | 2018-03-15 | 2019-09-24 | 南京大学 | Multi-channel terahertz spectrographic detection unit based on surface plasma body resonant vibration antenna |
| CN111433591A (en) * | 2017-10-09 | 2020-07-17 | Csir公司 | Gas detection system and method |
| CN111488749A (en) * | 2020-01-13 | 2020-08-04 | 华中科技大学 | Multispectral-based super-surface thermal radiation information loading and reading device and method |
| CN111861861A (en) * | 2020-07-30 | 2020-10-30 | 哈尔滨方聚科技发展有限公司 | Miniature dynamic infrared image generation device |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104122235A (en) * | 2013-04-25 | 2014-10-29 | 北京格宝应用技术有限公司 | Detection device and method for olefin gas |
| CN103413395B (en) * | 2013-08-15 | 2016-04-13 | 北京声迅电子股份有限公司 | Flue gas intelligent detecting prewarning method and device |
| CN103413395A (en) * | 2013-08-15 | 2013-11-27 | 北京声迅电子股份有限公司 | Intelligent smoke detecting and early warning method and device |
| CN104568806B (en) * | 2013-10-28 | 2017-10-27 | 上海巨哥电子科技有限公司 | A kind of gas-detecting device |
| CN104568806A (en) * | 2013-10-28 | 2015-04-29 | 上海巨哥电子科技有限公司 | Gas detection device |
| CN105527290A (en) * | 2015-12-31 | 2016-04-27 | 青岛市光电工程技术研究院 | All-time marine sulfur dioxide gas discharge remote measurement method and apparatus |
| CN106525726A (en) * | 2016-11-24 | 2017-03-22 | 西安交通大学 | Passive infrared imaging-based automobile exhaust visual real-time monitoring apparatus |
| CN111433591A (en) * | 2017-10-09 | 2020-07-17 | Csir公司 | Gas detection system and method |
| CN111433591B (en) * | 2017-10-09 | 2023-07-25 | Csir公司 | Gas detection system and method |
| CN110274889A (en) * | 2018-03-15 | 2019-09-24 | 南京大学 | Multi-channel terahertz spectrographic detection unit based on surface plasma body resonant vibration antenna |
| CN110274889B (en) * | 2018-03-15 | 2021-05-28 | 南京大学 | Multichannel terahertz spectrum detection unit based on surface plasma resonance antenna |
| CN109164057A (en) * | 2018-10-12 | 2019-01-08 | 北京环境特性研究所 | The infrared multi-spectral imaging remote sense monitoring system of chemical gas, device and method |
| CN111488749A (en) * | 2020-01-13 | 2020-08-04 | 华中科技大学 | Multispectral-based super-surface thermal radiation information loading and reading device and method |
| CN111488749B (en) * | 2020-01-13 | 2021-07-27 | 华中科技大学 | Multispectral-based super-surface thermal radiation information loading and reading device and method |
| CN111861861A (en) * | 2020-07-30 | 2020-10-30 | 哈尔滨方聚科技发展有限公司 | Miniature dynamic infrared image generation device |
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Application publication date: 20120328 |