Methane detection method and flight device

Abstract

The present invention provides a methane detection method and a flight device, wherein the steps of the methane detection method are as follows: alternately irradiate a first laser light source and a second laser light source under the same position information; the first laser light source irradiates the area to be measured to obtain first image data; the second laser light source irradiates the area to be measured, and after the second laser light source reacts with the methane in the area to be measured, obtains second image data; and combines the first image data, the second image data and the position information to obtain the position and area of ​​the methane leakage area. The methane detection method provided by the present invention alternately irradiates the detection area of ​​outdoor methane leakage with the first laser light source and the second laser light source, using the first image data as a reference image; using the second image data irradiated by the second laser light source as a reference image; calculating the specific area and area of ​​the methane leakage through the reference image, the reference image and the position information at a specific position, thereby realizing rapid and accurate detection of outdoor methane leakage.

Description

Technical Field

[0001] The present invention relates to the technical field of methane detection, and in particular to a methane detection method and a flight device. Background Art

[0002] The molecular formula of methane is CH4, which is the simplest organic compound. Methane is a colorless and odorless gas with a boiling point of -161.4℃. It is lighter than air, so when exposed to the air, it will float into the sky. It is a flammable gas that is extremely difficult to dissolve in water. Methane is basically non-toxic to humans, but when the concentration is too high, the oxygen content in the air will be significantly reduced, causing suffocation. It is widely present in natural gas, biogas, and coal mine gas. It is a high-quality gas fuel and an important raw material for the manufacture of synthetic gas and many chemical products. The leakage of methane can easily cause the risk of explosion and waste resources.

[0003] Most commonly used methane detectors are single-point detectors, which generally use a catalytic reaction method to detect the concentration of methane. However, for methane leaks in large areas such as the wild or factory areas, this single-point working method is difficult to detect on a large scale. Summary of the invention

[0004] The present invention provides a methane detection method and a flight device, which are used to solve the defect that there is no detection technology for methane leakage in a large outdoor area in the prior art, and realize the detection of methane leakage outdoors and determine the leakage region and area.

[0005] The present invention provides a methane detection method, comprising the steps of:

[0006] Alternately irradiating the first laser light source and the second laser light source under the same position information;

[0007] The first laser light source irradiates the area to be measured to obtain first image data of the area to be measured;

[0008] The second laser light source irradiates the area to be measured, and after the second laser light source reacts with the methane in the area to be measured, second image data of the area to be measured after the reaction is obtained;

[0009] The first image data, the second image data and the position information are combined to obtain the methane leakage area position and area of ​​the area to be detected.

[0010] According to the methane detection method provided by the present invention, the step of obtaining the first image data of the area to be detected includes:

[0011] The first laser light source emits visible light laser;

[0012] After being collimated, irradiation is performed on the area to be measured;

[0013] The light reflected from the area to be measured is focused;

[0014] The focused light is detected to obtain first image data.

[0015] According to the methane detection method provided by the present invention, the step of obtaining the second image data of the area to be detected after the reaction comprises:

[0016] The second laser light source emits laser light of a specific wavelength;

[0017] After being collimated, irradiation is performed on the area to be measured;

[0018] Where there is methane in the area to be tested, the methane absorbs the laser of the specific wavelength;

[0019] The light reflected from the area to be tested without methane is focused;

[0020] The focused light is detected to obtain second image data.

[0021] According to the methane detection method provided by the present invention, the step of obtaining the location and area of ​​the methane leakage region in the area to be detected includes:

[0022] The first image data is subtracted from the second image data to obtain a methane leakage area;

[0023] The methane leakage area is combined with the position information to obtain the methane leakage area location and area.

[0024] According to the methane detection method provided by the present invention, the specific steps of obtaining the methane leakage area include:

[0025] Performing stretching processing on the first image data and the second image data;

[0026] subtracting the first image data after stretching from the second image data;

[0027] Enhance the contrast of the subtracted image data to reveal the methane leakage area.

[0028] The present invention also provides a flying device, comprising:

[0029] The first laser light source and the second laser light source mentioned above,

[0030] a laser controller configured to control the first laser light source and the second laser light source to alternately irradiate,

[0031] a detector configured to receive light reflected from the area to be measured,

[0032] a processing unit for processing the data sent by the detector,

[0033] A flight unit is configured to carry the first laser light source, the second laser light source, the laser controller and the detector.

[0034] The flight device provided by the present invention further includes a front optical unit, and the light of the first laser light source and the second laser light source passes through the front optical unit to reach the area to be measured.

[0035] The reflected light from the area to be measured passes through the front optical unit and reaches the detector.

[0036] The flight device provided according to the present invention further includes an image transmission unit, which sends the data of the detector to the processing unit.

[0037] The flight device provided according to the present invention further includes a steering unit, and the light of the first laser light source and the second laser light source passes through the steering unit to reach the front optical unit.

[0038] According to the flight device provided by the present invention, the flight unit is a drone or an airship.

[0039] The methane detection method provided by the present invention alternately irradiates the detection area of ​​outdoor methane leakage with a first laser light source and a second laser light source at the same specific position, and uses the first image data irradiated by the first laser light source as the baseline image; and uses the second image data irradiated by the second laser light source that can react with methane as the reference image; the specific area and area of ​​the methane leakage are calculated through the baseline image, the reference image and the position information at the specific position, so as to realize rapid and accurate detection of large-scale outdoor methane leakage.

[0040] Furthermore, the aerial flight device provided by the present invention can be used to execute the methane detection method of the present invention, and therefore also has the above advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 This is one of the flow diagrams of the methane detection method provided by the present invention;

[0043] Figure 2 This is the second flow chart of the methane detection method provided by the present invention;

[0044] Figure 3This is the third flow chart of the methane detection method provided by the present invention;

[0045] Figure 4 This is the fourth flow chart of the methane detection method provided by the present invention;

[0046] Figure 5 This is the fifth flow chart of the methane detection method provided by the present invention;

[0047] Figure 6 It is a schematic diagram of information transmission of the flight device provided by the present invention.

[0048] Reference numerals:

[0049] 100: first laser light source; 200: second laser light source; 300: laser controller;

[0050] 400: area to be tested; 500: detector; 600: flight unit;

[0051] 101: front optical unit; 102: steering unit; 501: processing unit;

[0052] 502: Image transmission unit. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] In the description of the embodiments of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0055] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0057] Combine the following Figures 1 to 5 It should be understood that the following description is only an illustrative embodiment of the present invention and does not constitute a limitation on the present invention.

[0058] like Figure 1 As shown, the present invention provides a methane detection method, comprising the steps of:

[0059] S1: alternately irradiating the first laser light source and the second laser light source under the same position information;

[0060] S2: irradiating the area to be measured with a first laser light source to obtain first image data of the area to be measured;

[0061] S3: irradiating the area to be measured with a second laser light source, and obtaining second image data of the area to be measured after the second laser light source reacts with methane in the area to be measured;

[0062] S4: Combining the first image data, the second image data and the position information, obtaining the location and area of ​​the methane leakage region in the area to be detected.

[0063] Therefore, through the above steps of the present invention, the location and area of ​​the methane leakage area can be accurately obtained in the case of a large-area methane leakage.

[0064] In other words, according to the methane leakage situation at the site, a suitable geographical location is selected for irradiation, and the suitable geographical location includes a suitable height and a suitable angle, which can be accurate to the longitude and latitude coordinate values. After the first laser light source irradiates, a normal image of the area to be measured is obtained as the reference data. Furthermore, the second laser light source irradiates the same area to be measured at the same geographical location as the first laser light source, and obtains an image after the reaction with methane as the measurement data.

[0065] Furthermore, the regional position is obtained by calculating the benchmark data and the measurement data, and the regional area is obtained by combining the geographical location coordinates.

[0066] Of course, in the actual measurement process, multiple sets of data can be obtained by repeatedly switching the first laser light source and the second laser light source, and then screened or averaged. Alternatively, the above steps can be performed on multiple areas to be measured, and finally the measurement results of the multiple areas to be measured can be combined for comprehensive calculation.

[0067] In addition, if Figure 2 As shown, in an optional embodiment of the present invention, the step of obtaining first image data of the area to be tested includes:

[0068] S11: The first laser light source emits visible light laser;

[0069] S12: After collimation, it is irradiated on the area to be tested;

[0070] S13: The light reflected from the area to be measured is focused;

[0071] S14: The focused light is detected to obtain first image data.

[0072] Regarding the visible light laser in this embodiment, the first laser light source emits laser light in the visible light wavelength range, and laser light of this wavelength does not react with methane. Therefore, the first laser light source is an illumination light source to obtain a clear image of the area to be measured.

[0073] like Figure 3 As shown, in one embodiment of the present invention, the step of obtaining the second image data of the area to be tested after the reaction includes:

[0074] S21: The second laser light source emits laser light of a specific wavelength;

[0075] S22: After being collimated, it is irradiated on the area to be tested;

[0076] S23: There is methane in the area to be tested, and methane absorbs laser light of a specific wavelength;

[0077] S24: The light is reflected and focused in the area without methane.

[0078] S25: The focused light is detected to obtain second image data.

[0079] Specifically, lasers with specific wavelengths can be absorbed by methane. When the second laser light source emits lasers with specific wavelengths and irradiates the area where methane is located, the lasers with specific wavelengths are absorbed by methane. Therefore, the image of the area is a black image. In the actual detection process, the concentration of methane will also be reflected in the image for this reason. If the irradiated area is divided into an area with methane and an area without methane, the second image data detected will have both black areas and bright areas.

[0080] Furthermore, according to factors such as the on-site environment, the wavelength band with the best methane absorption effect can be adjusted or selected as the light of the second laser light source.

[0081] like Figure 4 As shown, in another embodiment of the present invention, the step of obtaining the methane leakage area of ​​the area to be detected includes:

[0082] S31: subtracting the first image data from the second image data to obtain a methane leakage area;

[0083] S32: The methane leakage area is obtained by combining the methane leakage region with the location information.

[0084] Furthermore, if Figure 5 As shown, in another optional embodiment of the present invention, the specific steps of obtaining the methane leakage area include:

[0085] S41: performing stretching processing on the first image data and the second image data;

[0086] S42: subtracting the stretched first image data from the second image data;

[0087] S43: enhancing the contrast of the image data after subtraction to reveal the methane leakage area.

[0088] Specifically, for the first image data and the second image data, image stretching processing is first performed according to the grayscale value in the image to avoid large-area negative values ​​in image subtraction. After image stretching, the first image data and the second image data are subtracted. Due to the absorption of light from the second laser light source by methane, the image value of the methane leakage area in the second image data becomes smaller, and the value of this area is larger after the subtraction operation; the measurement area without methane has a very small value after subtraction, so the methane leakage area after subtraction is revealed through the contrast enhancement operation.

[0089] The area of ​​the methane leakage area is obtained according to the position information and the methane leakage area. Of course, because the collimation and focusing processes are added, the focal length change parameters need to be considered in the actual calculation process.

[0090] like Figure 6 As shown, a flight device includes: the above-mentioned first laser light source 100 and the second laser light source 200, a laser controller 300 configured to control the alternating irradiation of the first laser light source 100 and the second laser light source 200, a detector 500 configured to receive the reflected light of the area to be measured 400, a processing unit 501 for processing the data sent by the detector 500, and a flight unit 600 configured to carry the first laser light source 100, the second laser light source 200, the laser controller 300 and the detector 500.

[0091] In other words, the first laser light source 100, the second laser light source 200 and the laser controller 300 can be configured as a light source unit, and lasers of different wavelengths can be switched by the laser controller 300, wherein at least two wavelengths of lasers can be switched. One is light of a wavelength that is not absorbed by methane, namely the first laser light source 100, and the other is light of a wavelength that is absorbed by methane, namely the second laser light source 200. Of course, according to actual conditions, the laser controller 300 can switch multiple lasers and can adjust parameters such as switching time, that is, it has other functions.

[0092] In this embodiment, for the detector 500, since the laser controller 300 can switch between the first laser light source 100 and the second laser light source 200, the area to be measured 400 will reflect the light of the first laser light source 100 and the light of the second laser light source 200, and then the detector 500 will receive the data of the above two reflected lights. Of course, since the second laser light source 200 will be absorbed by methane, the detector 500 will not receive the reflected light.

[0093] Furthermore, the detector 500 can send the acquired data to the processing unit 501 for processing in real time, or store the data, and then transmit the data to the processing unit 501 when needed.

[0094] In addition, in the actual detection process, due to the load limit of the flight unit 600, the processing unit 501 may not be carried on the flight unit 600. However, if necessary, the processing unit 501 may also be carried on the flight unit 600.

[0095] In one embodiment of the present invention, the aerial flight unit 600 is a drone or an airship or other flying device, so that the entire aerial flight device can be used to easily obtain images of the area to be measured.

[0096] Continue to refer Figure 5 In another optional embodiment of the present invention, the flight device also includes a front optical unit 101, and the light of the first laser light source 100 and the second laser light source 200 passes through the front optical unit 101 to reach the area to be measured 400, and the reflected light of the area to be measured 400 passes through the front optical unit to reach the detector 500.

[0097] The detector 500 is a two-dimensional array detector, a one-dimensional detector or a single point detector, and is not limited. The flight unit 600 is used to bring the flight device to a certain height above the ground so that the field of view of the front optical unit 101 can cover the area to be measured 400.

[0098] In an optional embodiment of the present invention, the flight device further includes an image transmission unit 502, and the image transmission unit 502 sends the data of the detector 500 to the processing unit 501. The image transmission unit is an image transmission radio station.

[0099] In another embodiment of the present invention, the flight device further includes a steering unit 102, and the light from the first laser light source 100 and the second laser light source 200 passes through the steering unit 102 to reach the front optical unit 101. The steering unit 102 may be a semi-transparent and semi-reflective mirror.

[0100] The flight device also includes a power supply unit, which is a stabilized power supply for supplying power to the light source unit, the laser controller 300, the detector 500, and the image transmission unit 502. The stabilized power supply can be a battery stabilized power supply, a fuel cell stabilized power supply, or an oil-electric hybrid stabilized power supply, etc.

[0101] The following is an explanation of the methane detection process using a flight device:

[0102] First, the flight unit 600 rises to a specified height so that the field of view of the front optical unit 101 can cover the area to be measured 400. Then, the laser controller 300 of the light source unit turns on the first laser light source 100, and the light of the first laser light source 100 passes through the steering unit 102, and the light is transferred to the front optical unit 101 for collimation, and then irradiated on the area to be measured 400. The area to be measured 400 reflects all the light of the first laser light source 100 to the front optical unit 101, and after being focused by the front optical unit 101, it reaches the detector 500. The detector 500 obtains the first image data, and transmits the first image data to the processing unit 501 through the image transmission unit 502.

[0103] Similarly, the laser controller 300 turns off the first laser light source 100 and turns on the second laser light source 200. The light of the second laser light source 200 passes through the steering unit 102 and the front optical unit 101 in sequence to reach the same area to be measured 400. The area with methane in the area to be measured 400 will absorb the light of the second laser light source 200, and the area without methane will reflect the light of the second laser light source 200. The reflected light similarly passes through the front optical unit 101 to reach the detector 500. The detector 500 obtains the second image data and transmits the second image data to the processing unit 501 through the image transmission unit 502.

[0104] Furthermore, the processing unit 501 performs a subtraction on the acquired first image data and the second image data to obtain the methane leakage region, and obtains the area of ​​the methane leakage region in combination with the GPS position information on the flight unit 600 .

[0105] The methane detection method provided by the present invention alternately irradiates the detection area of ​​outdoor methane leakage with a first laser light source and a second laser light source at the same specific position, and uses the first image data irradiated by the first laser light source as the baseline image; and uses the second image data irradiated by the second laser light source that can react with methane as the reference image; the specific area and area of ​​the methane leakage are calculated through the baseline image, the reference image and the position information at the specific position, so as to realize rapid and accurate detection of large-scale outdoor methane leakage.

[0106] Furthermore, the aerial flight device provided by the present invention can be used to execute the methane detection method of the present invention, and therefore also has the above advantages.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A methane detection method, characterized in that: Includes steps: Alternately irradiating the first laser light source and the second laser light source under the same position information; The first laser light source irradiates the area to be measured to obtain first image data of the area to be measured; The second laser light source irradiates the area to be measured, and after the second laser light source reacts with the methane in the area to be measured, second image data of the area to be measured after the reaction is obtained; Combining the first image data, the second image data and the position information, obtaining the location and area of ​​the methane leakage region in the area to be detected; The step of obtaining the first image data of the area to be tested comprises: The first laser light source emits visible light laser; After being collimated, irradiation is performed on the area to be measured; The light reflected from the area to be measured is focused; The focused light is detected to obtain first image data; The step of obtaining the second image data of the tested area after the reaction comprises: The second laser light source emits laser light of a specific wavelength; After being collimated, irradiation is performed on the area to be measured; Where there is methane in the area to be tested, the methane absorbs the laser of the specific wavelength; The light reflected from the area to be tested without methane is focused; The focused light is detected to obtain second image data.

2. The methane detection method according to claim 1, characterized in that: The step of obtaining the location and area of ​​the methane leakage region in the area to be detected comprises: The first image data is subtracted from the second image data to obtain a methane leakage area; The methane leakage area is combined with the position information to obtain the methane leakage area location and area.

3. The methane detection method according to claim 2, characterized in that: The specific steps of obtaining the methane leakage area include: Performing stretching processing on the first image data and the second image data; subtracting the first image data after stretching from the second image data; Enhance the contrast of the subtracted image data to reveal the methane leakage area.

4. A flying device, characterized in that: It is used to implement the methane detection method according to any one of claims 1 to 3, and the flying device comprises: a first laser light source and a second laser light source, a laser controller configured to control the first laser light source and the second laser light source to alternately irradiate, a detector configured to receive light reflected from the area to be measured, a processing unit for processing the data sent by the detector, A flight unit is configured to carry the first laser light source, the second laser light source, the laser controller and the detector.

5. The flying device according to claim 4, characterized in that: It also includes a front optical unit, through which the light from the first laser light source and the second laser light source reaches the area to be measured, and the reflected light from the area to be measured reaches the detector through the front optical unit.

6. The flying device according to claim 4, characterized in that: It also includes an image transmission unit, which sends the data of the detector to the processing unit.

7. The flying device according to claim 5, characterized in that: It also includes a steering unit, through which light from the first laser light source and the second laser light source passes to reach the front optical unit.

8. The flying device according to claim 4, characterized in that: The flight unit is a drone or an airship.

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