Gas leakage detection method and gas leakage detection device based on light-induced phosphorescence

Abstract

The invention provides a gas leakage detection method and device based on light-induced phosphorescence, and the method comprises the steps: mixing a phosphorescent material and a spraying material, and uniformly coating the surface of a to-be-detected pipeline with the mixture to form a phosphorescent material coating; irradiating the phosphorescent material coating by using a light source, so that the phosphorescent material coating emits phosphorescence; continuously acquiring images of the phosphorescent material coating in the axial direction of the to-be-detected pipeline to obtain a phosphorescent imaging result; and determining the position of the leakage point of the to-be-detected pipeline according to the position of the light spot in the phosphorescence imaging result.

Description

Technical Field

[0001] The present disclosure relates to the technical field of gas leakage detection, and more specifically, to a gas leakage detection method and a gas leakage detection device based on light-induced phosphorescence. Background Art

[0002] Gas pipeline transportation is an important way of energy transportation. Many regions have developed pipeline networks and natural gas pipelines are widely distributed to meet local natural gas demand. However, long-distance pipeline transportation will inevitably increase the risk of pipeline leakage, and gas leakage in the pipeline may cause air pollution, damage the surrounding environment and ecosystem, and affect air quality and ecological balance. Some gases are toxic, such as methane and hydrogen sulfide, which may have serious effects on plants, animals and water sources after leakage. In recent years, hydrogen energy has developed rapidly, and hydrogen and liquid hydrogen transportation pipelines have been gradually improved. Leakage detection cannot be ignored. There are dangers such as explosions after leakage, which seriously threaten people's health and property safety. In addition, leakage accidents may have a serious impact on economic security and energy security. Gas leakage will lead to energy waste, cause economic losses, and affect the stability of gas supply. The subsequent treatment and cleanup of leakage accidents require huge costs.

[0003] Therefore, gas pipeline leakage may cause environmental pollution, safety hazards, and economic losses. Timely detection of gas pipeline leakage is of great significance. Through effective detection technology and preventive measures, the occurrence of leakage accidents can be reduced, public safety and environmental protection can be guaranteed, and corporate interests and national strategic security can be maintained.

[0004] The current method for detecting gas leaks is to directly measure the content of leaking gas components, mainly using electrochemical sensors and infrared sensors. However, the measurement results are heavily dependent on the amount of gas leaked, and it is difficult to measure the concentration changes caused by trace amounts of gas leaked. In an open environment, leaked gas will diffuse rapidly, which will also reduce the reliability of the measurement and make it impossible to locate the leak point immediately. Summary of the invention

[0005] In order to solve at least one of the technical problems in the prior art, the embodiments of the present disclosure provide a gas leakage detection method and a gas leakage detection device based on light-induced phosphorescence, which do not require replacement of sensors for detection according to the gas composition of the pipeline leakage, thereby improving the versatility of leakage detection. At the same time, the influence of changing factors of the external environment on the determination of the leakage point of the pipeline to be tested can be avoided.

[0006] The embodiments of the present disclosure provide a gas leakage detection method based on light-induced phosphorescence, comprising: mixing a phosphorescent material and a spraying material, and uniformly coating the mixture on the surface of a pipeline to be tested to form a phosphorescent material coating; irradiating the phosphorescent material coating with a light source so that the phosphorescent material coating emits phosphorescence; continuously acquiring an image of the phosphorescent material coating along the axial direction of the pipeline to be tested to obtain a phosphorescent imaging result; and determining the position of the leakage point of the pipeline to be tested according to the position of the light spot in the phosphorescent imaging result.

[0007] According to some embodiments of the present disclosure, fluid flows through the pipeline to be tested, and the leakage point of the pipeline to be tested is the point where the fluid overflows from the pipeline to be tested; the wavelength and intensity of the phosphorescence are changed by the temperature difference between the temperature of the leakage point of the pipeline to be tested and the external ambient temperature.

[0008] According to some embodiments of the present disclosure, the wavelength and intensity of the phosphorescence are changed by the electron energy level distribution of the phosphorescent material coating, and the electron energy level distribution of the phosphorescent material coating is changed by the temperature difference between the leakage point of the pipeline to be tested and the external ambient temperature.

[0009] According to some embodiments of the present disclosure, when there is a temperature difference between the temperature of the leakage point of the pipeline to be tested and the external environment temperature, a light spot exists in the phosphorescence imaging result.

[0010] According to some embodiments of the present disclosure, the phosphorescent material accounts for no less than 1% of the mixture of the phosphorescent material and the spraying material.

[0011] According to some embodiments of the present disclosure, the wavelength range of the above-mentioned phosphorescence is 390nm~780nm or 780nm~14um.

[0012] According to some embodiments of the present disclosure, the phosphorescent material is zinc oxide or silicon dioxide containing rare earth components.

[0013] According to some embodiments of another aspect of the present disclosure, a gas leakage detection device is provided, which is applied to the above-mentioned gas leakage detection method based on light-induced phosphorescence, and the above-mentioned gas leakage detection device includes: a light source, which is used to emit a detection light source to irradiate a phosphorescent material coating coated on the surface of the pipeline to be tested, so that the above-mentioned phosphorescent material coating emits phosphorescence; an imaging component, which is used to continuously image the above-mentioned phosphorescent material coating to obtain a phosphorescence imaging result; a filter, which is arranged at the front end of the above-mentioned imaging component, and the transmission wavelength of the above-mentioned filter is the same as the wavelength range of the above-mentioned phosphorescence, so as to filter the reflected light of the external environment; a processor, which is electrically connected to the above-mentioned imaging component, and the above-mentioned processor is used to determine the position of the leakage point of the above-mentioned pipeline to be tested according to the above-mentioned phosphorescence imaging result.

[0014] According to some embodiments of the present disclosure, the detection light source emitted by the light source is ultraviolet light, visible light or natural light.

[0015] According to some embodiments of the present disclosure, when the detection light source is ultraviolet light, the wavelength range of the ultraviolet light is 10nm~400nm; when the detection light source is visible light, the wavelength range of the visible light is 390nm~780nm.

[0016] According to a gas leakage detection method and a gas leakage detection device based on light-induced phosphorescence in an embodiment of the present disclosure, a phosphorescent material and a spray material are mixed and uniformly coated on the surface of a pipeline to be tested to form a phosphorescent material coating. A light source is used to irradiate the phosphorescent material coating so that the phosphorescent material coating emits phosphorescence. An image of the phosphorescent material coating is continuously acquired along the axial direction of the pipeline to be tested to obtain a phosphorescent imaging result. The position of the leakage point of the pipeline to be tested is determined according to the position of the light spot in the phosphorescent imaging result. There is no need to replace the sensor for detection according to the gas composition of the pipeline leakage, thereby improving the versatility of leakage detection. At the same time, the influence of changing factors of the external environment on the determination of the leakage point of the pipeline to be tested can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a flow chart of a gas leak detection method based on light-induced phosphorescence according to an illustrative embodiment of the present disclosure;

[0018] Figure 2 is a graph showing changes in phosphorescence wavelength and intensity under different temperature conditions according to an exemplary embodiment of the present disclosure;

[0019] Figure 3 is a phosphorescence imaging result diagram according to an illustrative embodiment of the present disclosure;

[0020] Figure 4 is a structural schematic diagram of a gas leakage detection device according to an exemplary embodiment of the present disclosure;

[0021] Figure 5 is a structural schematic diagram of a gas leakage detection device according to another exemplary embodiment of the present disclosure.

[0022] In the drawings, the meanings of the reference numerals are as follows:

[0023] 1. Pipeline to be tested;

[0024] 2. Phosphorescent material coating;

[0025] 3. Light source;

[0026] 4. Imaging components;

[0027] 5. Filter. DETAILED DESCRIPTION

[0028] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present disclosure. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present disclosure. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present disclosure.

[0029] The terms used herein are only for describing specific embodiments and are not intended to limit the present disclosure. The terms "comprise", "include", etc. used herein indicate the existence of the features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0030] All terms (including technical and scientific terms) used herein have the meanings commonly understood by those skilled in the art unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0031] In the case of using expressions such as "at least one of A, B, and C, etc.", it should generally be interpreted in accordance with the meaning of the expression generally understood by those skilled in the art (for example, "a system having at least one of A, B, and C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.). In the case of using expressions such as "at least one of A, B, or C, etc.", it should generally be interpreted in accordance with the meaning of the expression generally understood by those skilled in the art (for example, "a system having at least one of A, B, or C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.).

[0032] The current method for detecting gas leaks is to directly measure the content of leaking gas components, mainly using electrochemical sensors and infrared sensors. Electrochemical sensors use the redox reaction between hydrogen and the electrode surface to indirectly detect hydrogen by measuring the current or potential changes generated by the reaction. The detection process is greatly affected by external environmental factors, such as changes in temperature and humidity, which may affect the accuracy and stability of electrochemical sensors, and different measurement sensors need to be replaced for different gas leaks. Infrared sensors use the absorption characteristics of hydrogen in the infrared spectrum region for detection. The detection process is an integral measurement technology that can only obtain the average result in the measurement area. Its measurement results are heavily dependent on the concentration information of the gas and have no advantages in an open environment. Both electrochemical sensors and infrared sensors require regular maintenance and calibration, and are passive measurement methods. The measurement results are heavily dependent on the amount of gas leakage. It is difficult to measure the concentration changes caused by trace leaks of gas, and there is a problem of missed detection. In an open environment, the layout of electrochemical sensors and infrared sensors is also difficult, and the leaked gas will spread rapidly, which will also reduce the reliability of the measurement and make it impossible to locate the leak point in the first time.

[0033] In order to improve the sensitivity of gas leakage detection, according to the inventive concept of one aspect of the present disclosure, a phosphorescent material and a spray material are mixed and uniformly coated on the surface of the pipeline to be tested to form a phosphorescent material coating, and a light source is used to irradiate the phosphorescent material coating so that the phosphorescent material coating emits phosphorescence. An image of the phosphorescent material coating is continuously acquired along the axial direction of the pipeline to be tested to obtain a phosphorescent imaging result. The position of the leakage point of the pipeline to be tested is determined according to the position of the light spot in the phosphorescent imaging result. There is no need to replace the sensor for detection according to the gas composition of the pipeline leakage, which improves the versatility of leakage detection. At the same time, the influence of changing factors of the external environment on the determination of the leakage point of the pipeline to be tested can be avoided.

[0034] Figure 1 is a flow chart of a gas leak detection method based on light-induced phosphorescence according to an illustrative embodiment of the present disclosure.

[0035] According to an embodiment of the present disclosure, a gas leakage detection method based on light-induced phosphorescence is provided, such as Figure 1 As shown, the process includes the following steps S1 to S4.

[0036] Step S1: Mix the phosphorescent material and the spraying material, and evenly coat the mixture on the surface of the pipeline 1 to be tested, so as to form a phosphorescent material coating 2.

[0037] According to the embodiments of the present disclosure, the phosphorescent material and the spraying material are mixed, uniformly sprayed on the wall surface of the pipeline 1 to be tested and waited to dry to form a phosphorescent material coating 2. After the phosphorescent material coating 2 is sprayed and attached once, it can be used repeatedly for a long time. It is suitable for long-distance gas transmission and liquefied gas pipelines, regular leakage inspections or unmanned inspections and other scenarios.

[0038] Step S2: irradiating the phosphorescent material coating 2 with the light source 3 so that the phosphorescent material coating 2 emits phosphorescence.

[0039] Step S3: continuously acquiring images of the phosphorescent material coating 2 along the axial direction of the pipeline 1 to be tested, and obtaining phosphorescent imaging results.

[0040] According to the embodiments of the present disclosure, since the fluid in the pipeline 1 to be tested overflows from the pipeline 1 to be tested, the temperature around the leakage point of the pipeline 1 to be tested is different from the temperature of the pipeline wall surface of the pipeline 1 to be tested that is not leaking, and areas with different temperatures on the phosphorescent material coating 2 will emit phosphorescence of different wavelengths and different intensities, and there will be light spots in the phosphorescent imaging results.

[0041] Step S4: Determine the position of the leakage point of the pipeline 1 to be tested according to the position of the light spot in the phosphorescence imaging result.

[0042] According to an embodiment of the present disclosure, a phosphorescent material and a spraying material are mixed and uniformly coated on the surface of the pipeline 1 to be tested to form a phosphorescent material coating 2. The phosphorescent material coating 2 is irradiated by a light source 3 so that the phosphorescent material coating 2 emits phosphorescence. An image of the phosphorescent material coating 2 is continuously acquired along the axial direction of the pipeline 1 to be tested to obtain a phosphorescent imaging result. Since there is a temperature change around the leakage point of the pipeline 1 to be tested, there is a light spot in the phosphorescent imaging result. According to the position of the light spot in the phosphorescent imaging result, the position of the leakage point of the pipeline 1 to be tested is determined. The gas leakage detection method based on light-induced phosphorescence can detect without replacing the sensor according to the gas composition of the pipeline leakage, thereby improving the versatility of leak detection. At the same time, it can avoid the influence of changing factors of the external environment on the determination of the leakage point of the pipeline 1 to be tested.

[0043] According to the embodiment of the present disclosure, fluid flows through the pipeline 1 to be tested, and the leakage point of the pipeline 1 to be tested is the point where the fluid overflows from the pipeline 1 to be tested. The wavelength and intensity of phosphorescence are affected by the temperature difference between the leakage point of the pipeline 1 to be tested and the external environment temperature.

[0044] According to the embodiments of the present disclosure, the fluid flowing through the pipeline 1 to be tested may be a combustible gas such as natural gas and hydrogen, or a non-combustible gas such as oxygen, or a liquefied gas such as liquid hydrogen, liquid nitrogen, or liquid oxygen.

[0045] According to the embodiments of the present disclosure, after the phosphorescent material coating 2 is irradiated by the light source 3 (for example, ultraviolet light or visible light), it will emit phosphorescence with a long duration and high luminescence intensity. The luminescence intensity and emission wavelength of the phosphorescent material are sensitive to temperature, and the temperature change of 1mK can be distinguished. Since the fluid in the pipeline 1 to be tested overflows from the pipeline 1 to be tested, the temperature around the leakage point of the pipeline 1 to be tested is different from the temperature of the pipeline wall surface of the pipeline 1 to be tested that is not leaking, and the areas with different temperatures on the phosphorescent material coating 2 will emit phosphorescence of different wavelengths and different intensities. Leakage is detected by the temperature change around the leakage point of the pipeline 1 to be tested, and there is no need to replace the sensor for detection according to the gas composition of the pipeline leakage, which improves the versatility of leak detection. At the same time, it can avoid the influence of external environmental change factors (such as temperature and humidity) on the determination of the leakage point of the pipeline 1 to be tested.

[0046] According to the embodiments of the present disclosure, the wavelength and intensity of phosphorescence are changed by the electron energy level distribution of the phosphorescent material coating 2, and the electron energy level distribution of the phosphorescent material coating 2 is changed by the temperature difference between the leakage point of the pipeline 1 to be tested and the external ambient temperature.

[0047] According to the embodiment of the present disclosure, the electrons in the phosphorescent material coating 2 are excited by the light source 3 and transition from a low energy level to a high energy level to generate photons, that is, the phosphorescent material coating 2 emits phosphorescence after being irradiated by the light source 3 .

[0048] Figure 2 is a graph showing changes in phosphorescence wavelength and intensity under different temperature conditions according to an illustrative embodiment of the present disclosure.

[0049] According to the embodiments of the present disclosure, Figure 2 As shown, Figure 2 The X-axis in the equation represents wavelength, Figure 2 The Y axis in the graph represents temperature. Figure 2 The Z axis in the figure represents the spectral intensity. Different temperature regions on the phosphorescent material coating 2 will emit phosphorescence with different wavelengths and intensities. Figure 2 The two characteristic peaks 455nm and 493nm are located in a higher spectral intensity region. At wavelengths of 455nm and 493nm, the phosphorescence intensity is stronger. As the temperature changes, the peak positions of the characteristic peaks will shift due to the influence of the electron energy level distribution of the phosphorescent material coating 2.

[0050] Figure 3 is a diagram of phosphorescence imaging results according to an illustrative embodiment of the present disclosure.

[0051] According to the embodiments of the present disclosure, Figure 3 As shown, when there is a temperature difference between the temperature of the leakage point of the pipeline 1 to be tested and the external environment temperature, there is a light spot in the phosphorescence imaging result.

[0052] According to the embodiments of the present disclosure, since the fluid in the pipeline 1 to be tested overflows from the pipeline 1 to be tested, the temperature around the leakage point of the pipeline 1 to be tested is different from the external ambient temperature, and areas with different temperatures on the phosphorescent material coating 2 will emit phosphorescence of different wavelengths and different intensities. There are light spots in the phosphorescent imaging results, and the temperature changes at the leakage point caused by trace leakage of the fluid can be effectively identified, thereby improving the reliability and sensitivity of detecting leakage of the pipeline 1 to be tested.

[0053] According to an embodiment of the present disclosure, the phosphorescent material accounts for no less than 1% of the mixture of the phosphorescent material and the spraying material.

[0054] According to the embodiments of the present disclosure, the proportion of phosphorescent material in the mixture of phosphorescent material and spraying material is not less than 1% to meet the detection requirements, so that the phosphorescent material coating 2 can have a better luminous effect after being irradiated by the light source 3.

[0055] According to an embodiment of the present disclosure, the wavelength range of phosphorescence is 390nm~780nm or 780nm~14um.

[0056] According to the embodiment of the present disclosure, the phosphorescence is in the visible light band or the infrared light band. When the phosphorescent material coating 2 emits phosphorescence in the visible light band, the wavelength range of the phosphorescence is 390nm~780nm. When the phosphorescent material coating 2 emits phosphorescence in the infrared light band, the wavelength range of the phosphorescence is 780nm~14um.

[0057] According to an embodiment of the present disclosure, the phosphorescent material is zinc oxide or silicon dioxide containing a rare earth component.

[0058] According to the embodiment of the present disclosure, the silicon dioxide containing rare earth components is, for example, silicon dioxide powder doped with rare earth components such as neodymium or dysprosium. The phosphorescent material has good luminescence characteristics and temperature sensitivity characteristics in the range of 200k~500k.

[0059] Figure 4 is a structural schematic diagram of a gas leakage detection device according to an illustrative embodiment of the present disclosure.

[0060] According to another embodiment of the present disclosure, Figure 4As shown, a gas leakage detection device is provided, which is applied to the above-mentioned gas leakage detection method based on light-induced phosphorescence, and the gas leakage detection device includes a light source 3, an imaging component 4, a filter 5 and a processor. The light source 3 is used to emit a detection light source to illuminate the phosphorescent material coating 2 coated on the surface of the pipeline 1 to be tested, so that the phosphorescent material coating 2 emits phosphorescence. The imaging component 4 is used to continuously image the phosphorescent material coating 2 to obtain a phosphorescence imaging result. The filter 5 is arranged at the front end of the imaging component 4, and the transmission wavelength of the filter 5 is the same as the wavelength range of phosphorescence to filter the reflected light from the external environment. The processor is electrically connected to the imaging component 4, and the processor is used to determine the position of the leakage point of the pipeline 1 to be tested according to the phosphorescence imaging result.

[0061] According to an embodiment of the present disclosure, the imaging component 4 may be, for example, a CCD camera, and the imaging component 4 is used to perform continuous two-dimensional plane imaging on the phosphorescent material coating 2 to obtain phosphorescent imaging results.

[0062] According to the embodiment of the present disclosure, the transmission wavelength of the filter 5 is in the same range as the wavelength of phosphorescence, and can filter the reflected light from the external environment, thereby improving the accuracy of detecting the leakage point of the pipeline 1 to be tested.

[0063] According to the embodiments of the present disclosure, when detecting the leakage point of the pipeline 1 to be tested, the gas leakage detection device can be handheld or mounted on a drone. Both methods can perform rapid inspections without the need to arrange an optical path, thereby improving the efficiency of determining the location of the leakage point of the pipeline 1 to be tested, saving time and effort.

[0064] According to an embodiment of the present disclosure, the detection light source emitted by the light source 3 is ultraviolet light, visible light or natural light.

[0065] According to an embodiment of the present disclosure, the detection light source may be emitted in the form of continuous light or pulsed light.

[0066] According to the embodiments of the present disclosure, in an open environment, the phosphorescent material coating 2 will emit a faint phosphorescence under the irradiation of natural light. At this time, the detection light source emitted by the light source 3 built into the gas leakage detection device can be ultraviolet light. When the phosphorescent material coating 2 is irradiated with ultraviolet light again, the phosphorescence intensity emitted by the phosphorescent material coating 2 will be higher, and the light spot in the phosphorescent imaging result will be more obvious.

[0067] Figure 5 is a structural schematic diagram of a gas leakage detection device according to another exemplary embodiment of the present disclosure.

[0068] According to the embodiments of the present disclosure, Figure 5As shown, the light source 3 can be separated from the imaging component 4, the filter 5 and the processor. For example, when the light source 3 is natural light, the gas leakage detection device includes the imaging component 4, the filter 5 and the processor. When detecting the leakage point of the pipeline 1 to be tested, since the phosphorescent material coating 2 emits phosphorescence under the irradiation of natural light, the gas leakage detection device can be handheld or mounted on a drone. Both methods can perform rapid inspections without arranging an optical path, thereby improving the efficiency of determining the location of the leakage point of the pipeline 1 to be tested.

[0069] According to an embodiment of the present disclosure, when the detection light source is ultraviolet light, the wavelength range of the ultraviolet light is 10nm~400nm. When the detection light source is visible light, the wavelength range of the visible light is 390nm~780nm.

[0070] According to the embodiment of the present disclosure, when the detection light source is ultraviolet light, the phosphor material coating 2 has a better luminous effect after being irradiated by the light source 3, and the light spot in the phosphorescent imaging result will be more obvious.

[0071] It will be appreciated by those skilled in the art that the features described in the various embodiments and / or claims of the present disclosure may be combined or coupled in a variety of ways, even if such combinations or couplings are not explicitly described in the present disclosure. In particular, the features described in the various embodiments and / or claims of the present disclosure may be combined or coupled in a variety of ways without departing from the spirit and teachings of the present disclosure. All of these combinations and / or couplings fall within the scope of the present disclosure.

[0072] It should also be noted that the directional terms mentioned in the embodiments, such as "upper", "lower", "front", "back", "left", "right", etc., are only reference directions of the drawings and are not intended to limit the scope of protection of the present disclosure. Throughout the drawings, the same elements are represented by the same or similar reference numerals. Conventional structures or configurations will be omitted when they may cause confusion in the understanding of the present disclosure, and the shapes and sizes of the components in the drawings do not reflect the actual size and proportion, but only illustrate the contents of the embodiments of the present disclosure.

[0073] Unless otherwise indicated, the numerical parameters in this specification and the appended claims are approximate values ​​and can be changed according to the desired properties obtained by the content of the present disclosure. Specifically, all numbers used in the specification and claims to express the content of the composition, reaction conditions, etc., should be understood to be modified by the term "about" in all cases. In general, the meaning of the expression is to include changes in some embodiments of ±10%, in some embodiments of ±5%, in some embodiments of ±1%, and in some embodiments of ±0.5% by a specific number.

[0074] The ordinal numbers used in the specification and claims, such as "first", "second", "third", etc., to modify the corresponding elements, do not themselves mean that the elements have any ordinal numbers, nor do they represent the order of one element and another element, or the order in the manufacturing method. The use of these ordinal numbers is only used to clearly distinguish a component with a certain name from another component with the same name.

[0075] In addition, unless the steps are specifically described or must occur in sequence, the order of the above steps is not limited to the above list, and can be changed or rearranged according to the required design. And the above embodiments can be mixed and matched with each other or with other embodiments based on design and reliability considerations, that is, the technical features in different embodiments can be freely combined to form more embodiments.

[0076] The embodiments of the present disclosure are described above. However, these embodiments are only for illustrative purposes and are not intended to limit the scope of the present disclosure. Although the embodiments are described above separately, this does not mean that the measures in the various embodiments cannot be used in combination to advantage. The scope of the present disclosure is defined by the attached claims and their equivalents. Without departing from the scope of the present disclosure, those skilled in the art may make a variety of substitutions and modifications, which should all fall within the scope of the present disclosure.

Claims

1. A gas leak detection method based on light-induced phosphorescence, comprising: Mixing the phosphorescent material and the spraying material, and evenly coating the mixture on the surface of the pipeline to be tested to form a phosphorescent material coating; irradiating the phosphorescent material coating with a light source so that the phosphorescent material coating emits phosphorescence; Continuously acquiring images of the phosphorescent material coating along the axial direction of the pipeline to be tested to obtain phosphorescent imaging results; The position of the leakage point of the pipeline to be tested is determined according to the position of the light spot in the phosphorescence imaging result.

2. The gas leakage detection method according to claim 1, wherein: Fluid flows through the pipeline to be tested, and the leakage point of the pipeline to be tested is the point where the fluid overflows from the pipeline to be tested; the wavelength and intensity of the phosphorescence are changed by the temperature difference between the temperature of the leakage point of the pipeline to be tested and the external ambient temperature.

3. The gas leakage detection method according to claim 2, wherein: The wavelength and intensity of the phosphorescence are changed by the electron energy level distribution of the phosphorescent material coating, and the electron energy level distribution of the phosphorescent material coating is changed by the temperature difference between the temperature of the leakage point of the pipeline to be tested and the external environment temperature.

4. The gas leakage detection method according to claim 3, wherein: In the case where there is a temperature difference between the temperature of the leakage point of the pipeline to be tested and the external environment temperature, there is a light spot in the phosphorescence imaging result.

5. The gas leakage detection method according to claim 1, wherein: The phosphorescent material accounts for no less than 1% of the mixture of the phosphorescent material and the spraying material.

6. The gas leakage detection method according to claim 1, wherein: The wavelength range of the phosphorescence is 390nm~780nm or 780nm~14um.

7. The gas leakage detection method according to claim 1, wherein: The phosphorescent material is zinc oxide or silicon dioxide containing rare earth components.

8. A gas leak detection device, wherein: The gas leakage detection method based on light-induced phosphorescence as described in any one of claims 1 to 7, wherein the gas leakage detection device comprises: A light source, used to emit a detection light source to illuminate the phosphorescent material coating coated on the surface of the pipeline to be tested, so that the phosphorescent material coating emits phosphorescence; An imaging component, used for continuously imaging the phosphorescent material coating to obtain phosphorescent imaging results; A filter, arranged at the front end of the imaging component, the transmission wavelength of the filter being in the same range as the wavelength of the phosphorescence, so as to filter the reflected light from the external environment; A processor is electrically connected to the imaging component, and the processor is used to determine the position of the leakage point of the pipeline to be tested according to the phosphorescence imaging result.

9. The gas leakage detection device according to claim 8, wherein: The detection light source emitted by the light source is ultraviolet light, visible light or natural light.

10. The gas leakage detection device according to claim 9, wherein: When the detection light source is ultraviolet light, the wavelength range of the ultraviolet light is 10nm~400nm; When the detection light source is visible light, the wavelength range of the visible light is 390nm~780nm.

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