CN212082732U - Hardware device for realizing gas leakage monitoring system of non-refrigeration detector - Google Patents
Hardware device for realizing gas leakage monitoring system of non-refrigeration detector Download PDFInfo
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- CN212082732U CN212082732U CN202020847605.5U CN202020847605U CN212082732U CN 212082732 U CN212082732 U CN 212082732U CN 202020847605 U CN202020847605 U CN 202020847605U CN 212082732 U CN212082732 U CN 212082732U
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 46
- 238000005057 refrigeration Methods 0.000 title claims abstract description 32
- 238000012545 processing Methods 0.000 claims abstract description 41
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 18
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- 230000005457 Black-body radiation Effects 0.000 description 1
- 238000004566 IR spectroscopy Methods 0.000 description 1
- XHCLAFWTIXFWPH-UHFFFAOYSA-N [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] XHCLAFWTIXFWPH-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model relates to a hardware device for realizing gas leakage monitoring system of non-refrigeration type detector, include: and the infrared lens is used for collecting and imaging infrared radiation in a monitoring scene to form an infrared light signal. And the infrared filtering module is connected with the infrared lens and is used for acquiring an infrared light signal of the gas with the infrared absorption waveband being a specific waveband as a target infrared light signal. And the non-refrigeration detector is connected with the infrared filtering module and is used for converting the target infrared light signal into an electric signal. And the data processing module is connected with the non-refrigeration type detector and is used for converting the electric signals into video data and/or image data. And the computer is connected with the data processing module and is used for processing the video data and/or the image data and displaying the processed result as a monitoring result. The utility model provides a technical scheme can improve gas leakage's discernment precision and response speed, improves monitoring efficiency and can improve maneuverability.
Description
Technical Field
The utility model relates to a gas monitoring technology field especially indicates a hardware device for realizing the gas leakage monitoring system of non-refrigeration type detector.
Background
Natural gas is used as an efficient, economic and environment-friendly green energy source, and plays an important role in improving the quality of life of residents. The development and utilization of natural gas can bring many benefits to urban development, industrial production and residential life. However, the leakage of natural gas frequently occurs during the process of exploitation and utilization, and when the leakage of dangerous gas occurs, not only energy loss is caused, but also dangerous consequences such as fire, explosion and the like are caused, and the safety of people's lives and properties is seriously threatened. Therefore, timely monitoring of natural gas leakage is an advance in ensuring safe exploitation and safe utilization of natural gas.
At present, in order to meet the requirement of identification precision, a refrigeration type infrared monitoring system is mainly adopted for monitoring natural gas leakage. For example: the gas thermal imaging instrument of GasFindIR series is developed by the American FLIR system company by adopting an infrared thermal imaging technology; PAT company has adopted the imaging spectrometer of Sherlock series of the spectral imaging technology to develop; FIRST hyperspectral imager developed by Telops Canada based on Fourier transform technology; the optical precision machinery and physical research institute of the national academy of sciences adopts an infrared thermal imaging technology, and combines a processing circuit and an algorithm to carry out real-time acquisition and monitoring of infrared images and the like on gas leakage.
For a refrigeration type infrared monitoring system on the market at present, the refrigeration type infrared monitoring system generally has the defects of large volume, high power consumption, high production and manufacturing cost and short service life. The non-refrigeration infrared monitoring system generally has the defects of low identification precision and low response speed, so the non-refrigeration infrared monitoring system is not popularized and utilized in the market.
SUMMERY OF THE UTILITY MODEL
In view of this, the main object of the present invention is to provide a hardware device for implementing a gas leakage monitoring system of a non-refrigeration detector, which reduces the manufacturing cost of the monitoring system on the premise of ensuring the recognition accuracy and response speed of the monitoring system.
The utility model provides a hardware device for realizing gas leakage monitoring system of non-refrigeration type detector, its improvement part lies in, the system includes:
and the infrared lens is used for collecting and imaging infrared radiation in a monitoring scene to form an infrared light signal.
The infrared filtering module is connected with the infrared lens and used for acquiring an infrared light signal of the gas with an infrared absorption waveband being a specific waveband as a target infrared light signal;
the non-refrigeration detector is connected with the infrared filtering module and is used for converting the target infrared light signal into an electric signal;
the data processing module is connected with the non-refrigeration detector and used for converting the electric signals into video data and/or image data;
and the computer is connected with the data processing module and is used for processing the video data and/or the image data and displaying the processed result as a detection result.
In one embodiment, the infrared lens, the infrared filtering module and the uncooled detector are coaxially arranged, and a response band of the infrared lens, a central wavelength of the infrared filtering module and a response band of the uncooled detector are matched with an infrared absorption band of a target gas.
In one embodiment, the response wave band of the infrared lens is 7-14 μm.
In one embodiment, the response band of the infrared lens is 7-8 μm.
In one embodiment, the infrared filtering module is a band-pass filter.
In one embodiment, the data processing module is further configured to perform non-uniformity correction processing, vignetting correction processing, and/or noise reduction processing on the video data and/or the image data.
In one embodiment, the computer is configured to perform interframe difference value processing, median filtering processing, dilation processing, and pseudo color marking processing on the output data of the data processing module.
In one embodiment, the computer is further configured to calculate the temperature of the monitored scene according to the planck's formula.
The utility model provides a monitoring system of infrared spectroscopy gas leakage includes infrared camera lens, infrared filtering module, non-refrigeration type detector, data processing module and computer. The infrared lens is used for collecting and imaging infrared radiation of chemical gas leaked in a monitoring scene to form an infrared light signal. The infrared filtering module is connected with the infrared lens and used for acquiring an infrared light signal of the gas with an infrared absorption waveband being a specific waveband as a target infrared light signal. The non-refrigeration detector is connected with the infrared filtering module and used for converting the target infrared light signal into an electric signal. And the data processing module is connected with the non-refrigeration type detector and is used for converting the electric signals into video data and/or image data. And the computer is connected with the data processing module and is used for processing the preprocessed video data and/or image data and displaying the processed result as a monitoring result. Based on the technical scheme provided by the utility model, through adopting non-refrigeration type detector, can reduce gas leakage monitoring system's manufacturing cost, simplify gas leakage monitoring system's structure, improve maneuverability. By acquiring the infrared light signal of the specific wave band of the leaked gas, the identification precision and the response speed of the monitoring system can be ensured.
Drawings
Fig. 1 is a schematic structural diagram of a hardware device for implementing a gas leakage monitoring system of a non-refrigeration detector according to an embodiment of the present invention.
Reference numerals:
10-infrared lens, 20-infrared filtering module, 30-non-refrigeration type detector, 40-data processing module and 50-computer
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element and be integral therewith, or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, one embodiment of the present invention provides a hardware device for implementing a gas leakage monitoring system of a non-refrigeration detector. The device comprises an infrared lens 10, an infrared filtering module 20, a non-refrigeration type detector 30, a data processing module 40, a computer 50 and a power supply 60. The infrared lens 10, the infrared filtering module 20 and the non-refrigeration type detector 30 are sequentially connected and coaxially arranged, and the non-refrigeration type detector 30 is connected with the data processing module 40. The data processing module 40 is also connected to a computer 50. A power supply 60 provides power to the entire monitoring system.
The infrared lens 10 is used for collecting infrared radiation in a monitored scene for imaging to form an infrared light signal.
Specifically, the infrared lens 10 in this embodiment may be a medium-long wave infrared lens, the response band of which may be 6 μm to 14 μm, the focal length of which may be 20mm to 70mm, and the F number of which may be any value less than or equal to 1.1, and the surface of the lens of the medium-long wave infrared lens is plated with an antireflection film, and the transmittance is greater than 88%.
For most VOCs gases, the absorption peak bands are common in the mid-wave infrared and long-wave infrared. From Planck's formula M (λ, T) ═ c1/λ5·1/(exp(c2λ T) -1), where M (λ, T) is the black body radiation of the T temperature, c1Is a first radiation constant, c2Is the second radiation constant, T is the temperature, and λ is the wavelength. In general, c1＝3.74×10-16W·m2，c2＝1.44×10-2W.K. Taking a black body at 27 ℃ as an example, the energy density of the long-wave infrared radiation is 172.5672W/m2The energy density of the medium wave infrared radiation is 5.8611W/m2It can be seen that the long wavelength infrared radiation energy is about 29 times the medium wavelength infrared radiation energy. Therefore, an infrared lens with the response wave band of 6-14 μm is selected.
In this embodiment, the optimal parameter reference data of the medium-long wave infrared lens is provided, and the data is only used for reference, and can be automatically adjusted in the range according to the special use condition. The optimal parameter reference data given in this example is that the response band is 7 μm to 8 μm, the focal length is 35mm, and the F number is 1.1.
The infrared filtering module 20 is configured to obtain an infrared light signal of a gas having an infrared absorption band of a specific band as a target infrared light signal.
Preferably, the infrared filtering module is a band-pass filter. The band-pass filter only allows infrared light signals of gas with infrared absorption wave bands being specific wave bands to pass through, and light signals of wave bands before and after the specific wave bands are all intercepted, so that the influence of other infrared radiation on the monitoring effect is prevented. The selection of the central wavelength of the band-pass filter depends on the infrared absorption peak of the gas to be measured, the selected bandwidth must ensure that the system has higher overall sensitivity under the condition of ensuring the signal-to-noise ratio, and has higher transmittance in a transmission waveband, so that the attenuation of radiation transmission in a light path can be reduced, and ineffective radiation in other wavebands can be effectively filtered.
Taking methane as an example, inquiring an HITRAN database to know that the infrared absorption peak of the methane in a long wave is 7.661 μm, selecting the central wavelength of the band-pass filter corresponding to the infrared absorption peak of the methane as 7.661 μm, considering the preparation difficulty and the overall sensitivity requirement of the band-pass filter, selecting the full width at half maximum bandwidth as 180nm, wherein the average transmittance is more than 80%, and the average transmittance in the rest wave bands of 0.4-11 μm is less than 1%.
The non-refrigeration type detector 30 is used to convert the target infrared light signal into an electrical signal.
Specifically, in this embodiment, the uncooled detector may be a vanadium oxide uncooled infrared focal plane detector. The resolution ratio is 640 x 512, the pixel size is 17 mu m, the response wave band is 3-14 mu m, the noise equivalent temperature difference is less than or equal to 60mk @25 ℃, and F # 1.0.
Preferably, the response band of the infrared lens, the central wavelength of the infrared filtering module and the response band of the non-refrigeration detector are matched with the infrared absorption band of the target gas, so that the phenomenon of inaccurate gas identification caused by mismatching of the response bands can be avoided.
In addition, the pretreatment in this embodiment includes: and performing non-uniform correction, dark corner correction and noise reduction in sequence.
The data processing module 40 is configured to convert the electrical signal into video data and/or image data, and pre-process the video data and/or image data to obtain pre-processed video data and/or image data; wherein the pre-processing comprises: non-uniformity correction processing, vignetting correction processing and noise reduction processing.
The computer 50 is also configured to calculate the temperature of the monitored scene according to the planck's formula.
In particular, from Planck's formula
Curve fitting expression of
Therefore, the RBFO parameter calibration is carried out on a front-end imaging system consisting of the infrared lens, the infrared filtering module and the non-refrigeration type detector, and the measured temperature value T can be obtained through the measured absolute pixel value. In which S represents the output signal, λ1,λ2Representing the spectral width, h representing the planck constant, K representing the boltzmann constant, c representing the speed of light, R (λ) representing the detector spectral response function, T representing absolute temperature (in kelvin), and λ representing wavelength.
The computer 50 is configured to process the preprocessed video data and/or image data, and display the processed result as a monitoring result.
Specifically, the computer 50 acquires data by serial communication, performs frame difference, median filtering, dilation operation and the like on the image result by using MATLAB, processes the monitoring result by using a pseudo-color marking algorithm, displays the monitoring result, and performs real-time monitoring and early warning.
Specifically, the power supply 60 may be an AC/DC regulated power supply.
The work flow of the utility model is introduced as follows:
when dangerous chemical gas leaks, gaseous cloud group gets into monitoring range, because the absorptive characteristic of infrared ray, also be exactly at normal atmospheric environment and contain the gaseous environment of leakage inconsistent of transmission loss, infrared camera lens 10 can collect the infrared radiation of absorption wave band rather than response wave band assorted gas, then the band pass filter piece through specific wave band is with the radiation signal of selecting the target gas of required monitoring, form target infrared light signal, carry out photoelectric conversion through non-refrigeration type detector 30, convert target infrared light signal into the signal of telecommunication, carry out inhomogeneous correction through data acquisition processing module and handle, the vignetting is rectified and is handled and fall the noise reduction to send the result to computer 50, further handle the back by the gas detection algorithm in the computer 50 and show for operating personnel. Once dangerous gas leaks, the system can carry out real-time monitoring and early warning.
The utility model discloses an adopt non-refrigeration type detector 30 can reduce gas leakage monitoring system's production manufacturing cost, simplify the system architecture to it is convenient to make entire system use. In addition, the infrared light signal of the medium-long wave band is selected, so that the defects of low identification precision and low response speed of a conventional gas leakage monitoring system based on an uncooled detector can be overcome, and the practical application working condition is met. The application conditions include, but are not limited to, monitoring of gas leakage in chemical industrial parks, safety monitoring of coal mines, environmental monitoring and the like.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (8)
1. A hardware device for implementing a gas leak monitoring system for a non-refrigerated detector, the device comprising:
the infrared camera (10) is used for collecting and imaging infrared radiation in a monitoring scene to form an infrared light signal;
the infrared filtering module (20) is connected with the infrared lens (10) and is used for acquiring an infrared light signal of the gas with an infrared absorption waveband being a specific waveband as a target infrared light signal;
the non-refrigeration type detector (30) is connected with the infrared filtering module (20) and is used for converting the target infrared light signal into an electric signal;
a data processing module (40) connected to the non-refrigeration type detector (30) for converting the electrical signal into video data and/or image data;
and the computer (50) is connected with the data processing module (40) and is used for processing the video data and/or the image data and displaying the processed result as a monitoring result.
2. The device according to claim 1, characterized in that said infrared lens (10), said infrared filtering module (20) and said non-refrigerated detector (30) are coaxially arranged, the response band of said infrared lens (10), the central wavelength of said infrared filtering module (20) and the response band of said non-refrigerated detector (30) being matched to the infrared absorption band of the target gas.
3. The device according to claim 1, characterized in that the response band of the infrared lens (10) is 7-14 μm.
4. The device according to claim 1, characterized in that the response band of the infrared lens (10) is 7-8 μm.
5. The device according to claim 1, characterized in that said infrared filtering module (20) is a band-pass filter.
6. The apparatus according to claim 1, wherein the data processing module (40) is further configured to perform non-uniformity correction processing, vignetting correction processing, and/or noise reduction processing on the video data and/or image data.
7. The apparatus according to claim 1 or 6, wherein the computer (50) is configured to perform inter-frame difference value processing, median filtering processing, dilation processing and pseudo color labeling processing on the output data of the data processing module (40).
8. The apparatus of claim 1, wherein the computer (50) is further configured to calculate the temperature of the monitored scene according to the planckian equation.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112634271A (en) * | 2021-03-09 | 2021-04-09 | 南京智谱科技有限公司 | Method and equipment for determining critical value of gas leakage amount detected by infrared camera |
| CN115541123A (en) * | 2022-11-21 | 2022-12-30 | 昆明北方红外技术股份有限公司 | System and method for testing NECL parameters of gas leak detector |
-
2020
- 2020-05-19 CN CN202020847605.5U patent/CN212082732U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112634271A (en) * | 2021-03-09 | 2021-04-09 | 南京智谱科技有限公司 | Method and equipment for determining critical value of gas leakage amount detected by infrared camera |
| CN112634271B (en) * | 2021-03-09 | 2021-06-18 | 南京智谱科技有限公司 | Method and equipment for determining critical value of gas leakage amount detected by infrared camera |
| CN115541123A (en) * | 2022-11-21 | 2022-12-30 | 昆明北方红外技术股份有限公司 | System and method for testing NECL parameters of gas leak detector |
| CN115541123B (en) * | 2022-11-21 | 2023-03-03 | 昆明北方红外技术股份有限公司 | NECL parameter testing system and method for gas leak detector |
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Effective date of registration: 20231207 Address after: Room 1056, Heying building, No. 99, Tuanjie Road, Jiangbei new district, Nanjing, Jiangsu Province, 210008 Patentee after: Nanjing Zhipu Technology Co.,Ltd. Patentee after: NANJING University Address before: Room 1056, Heying building, No. 99, Tuanjie Road, Jiangbei new district, Nanjing, Jiangsu Province, 210008 Patentee before: Nanjing Zhipu Technology Co.,Ltd. |
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