CN114427940A - High-pressure hydrogen leakage detection method and system - Google Patents
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- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 102
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- 150000002431 hydrogen Chemical class 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
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Abstract
The invention relates to a high-pressure hydrogen leakage detection method and a system, wherein the method comprises the following steps: sensing ultrasonic waves generated when hydrogen leakage occurs in the high-pressure hydrogen storage device by using the fiber bragg grating; emitting initial light to the fiber bragg grating by using a wide-spectrum light source of a demodulator; the initial light generates reflected light on the deformed fiber bragg grating; detecting the wavelength of the reflected light by using the demodulator to obtain a specific wavelength; calculating the central wavelength drift amount according to the specific wavelength based on a temperature compensation principle; and judging whether a hydrogen leakage accident occurs according to the central wavelength drift amount. Based on the advantages of small volume, wide detection range, high precision, strong stability, good real-time performance and the like of the fiber bragg grating, the invention utilizes the stress effect of the ultrasonic wave to identify the hydrogen leakage on the fiber bragg grating under the premise that the leakage source is generated along with the ultrasonic wave when the high-pressure hydrogen is leaked in the hydrogen fuel vehicle, thereby improving the accuracy of the detection and the positioning of the high-pressure hydrogen leakage.
Description
Technical Field
The invention relates to the technical field of sensor detection, in particular to a high-pressure hydrogen leakage detection method and system.
Background
The hydrogen energy is helpful for realizing carbon peak reaching and carbon neutralization targets in China. In order to complete the carbon neutralization task and realize the strategic objective of national petroleum safety, the popularization of hydrogen energy vehicles becomes inevitable in the field of national transportation.
The existing hydrogen fuel vehicle mostly adopts a gaseous high-pressure hydrogen storage mode in the aspect of fuel storage, but the hydrogen high-pressure storage tank of the hydrogen fuel vehicle has the danger of hydrogen leakage due to factors such as accidental vehicle collision or equipment aging. The hydrogen safety hidden danger is higher due to the wide combustible range, the rapid propagation speed and the low ignition of the hydrogen, and the hydrogen safety problem becomes the key for popularization of the hydrogen fuel vehicle in the future. When a hydrogen leakage accident happens, if a leakage source can be positioned as soon as possible so as to cut off the hydrogen supply and adopt a corresponding ventilation scheme according to the leakage position, the risk of hydrogen leakage and deflagration can be greatly reduced. However, because the hydrogen leakage accident models of the hydrogen fuel vehicle are few and the investigation of accident causes is incomplete, the position which can become a leakage source is difficult to predict, and a method for quickly positioning the hydrogen leakage source after an accident occurs is rarely researched.
Hydrogen is colorless tasteless, and the human body can't be perceived, and current hydrogen leaks the source location and often adopts many hydrogen sensors to arrange and detect and fix a position leaking the source through algorithm processing to leaking hydrogen leakage source, leaks the selection that leakage source positioning result precision and positioning speed relied on sensor position and quantity. The single sensor is point-type detection, the detection range is small, and the measurement stability and timeliness are poor. The multi-sensor arrangement can improve the stability of measurement, but the sensor is used as an obstacle to increase the error of the measurement result, the accuracy of the result is influenced, and meanwhile, the existing hydrogen sensor arrangement scheme for detecting the hydrogen leakage in the hydrogen fuel vehicle is not mature, and the leakage position is difficult to quickly locate.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a high-pressure hydrogen leakage detection method and system.
In order to achieve the purpose, the invention provides the following scheme:
a high-pressure hydrogen leak detection method comprising:
sensing ultrasonic waves generated when hydrogen leakage occurs in the high-pressure hydrogen storage device by using fiber gratings at different preset positions; the fiber grating deforms under the action of the ultrasonic waves;
emitting initial light to the fiber bragg grating by using a wide-spectrum light source of a demodulator; the initial light is incident to the fiber grating through the circulator; the initial light generates reflected light on the deformed fiber bragg grating; the reflected light is reflected back to the demodulator;
detecting the wavelength of the reflected light by using the demodulator to obtain a specific wavelength;
calculating the central wavelength drift amount according to the specific wavelength based on a temperature compensation principle;
and judging whether the wavelength drift occurs or not according to the central wavelength drift amount, and if so, determining that the hydrogen leakage accident occurs.
Preferably, the determining whether a wavelength shift occurs according to the central wavelength shift amount, and if so, after determining that a hydrogen leakage accident occurs, further includes:
determining ultrasonic sound pressure according to the central wavelength drift amount calculated by the fiber bragg gratings at different positions;
and determining the position of the leakage source according to the attenuation behavior relational expression of the ultrasonic wave in the inhomogeneous medium and the sound pressure.
Preferably, the formula for determining the sound pressure of the ultrasonic wave according to the center wavelength drift amount calculated by the fiber bragg gratings at different positions is as follows:
wherein λ isBFor the central wavelength of the grating, E represents the modulus of elasticity of the material, neffIs the effective refractive index of the grating, p11、p12A first constant and a second constant associated with the ultrasound propagation medium, respectively; delta lambdaBIs the center wavelength shift amount; p is the ultrasonic sound pressure.
Preferably, the determining the position of the leakage source according to the attenuation behavior relation of the ultrasonic wave in the inhomogeneous medium and the sound pressure comprises:
determining the distance between the first position and a leakage source according to the preset sound pressure and the attenuation behavior relational expression of the first position, and recording as a first distance;
determining the distance between the second position and a leakage source according to the preset sound pressure and the attenuation behavior relational expression of the second position, and recording the distance as a second distance;
determining the distance between the first position and the second position, and recording as a third distance;
determining the leakage source location from the first distance, the second distance, and the third distance based on a geometric relationship of triangles.
Preferably, the formula of the attenuation behavior relation is:
wherein p is1Is the sound pressure at the first location and,
is said first distance, p2Is the sound pressure at the second location and,
is the second distance, f is the frequency,
in the case of frequency f, in order to
In order to be a reference position for the attenuation,
the diffusion attenuation coefficient at the location of the location,
in the case of frequency f, in order to
In order to be a reference position for the attenuation,
absorption and scattering attenuation coefficients at the location.
A high-pressure hydrogen leak detection system comprising:
the ultrasonic sensing module is used for sensing ultrasonic waves generated when hydrogen leakage occurs in the high-pressure hydrogen storage device by using fiber gratings at different preset positions; the fiber grating deforms under the action of the ultrasonic waves;
the transmitting module is used for transmitting initial light to the fiber bragg grating by using a wide-spectrum light source of the demodulator; the initial light is incident to the fiber grating through the circulator; the initial light generates reflected light on the deformed fiber bragg grating; the reflected light is reflected back to the demodulator;
the wavelength detection module is used for detecting the wavelength of the reflected light by using the demodulator to obtain a specific wavelength;
the calculation module is used for calculating the central wavelength drift amount according to the specific wavelength based on the temperature compensation principle;
and the accident determining module is used for judging whether the wavelength drift occurs according to the central wavelength drift amount, and if so, determining that the hydrogen leakage accident occurs.
Preferably, the method further comprises the following steps:
the sound pressure determining module is used for determining the sound pressure of the ultrasonic wave according to the central wavelength drift amount calculated by the fiber bragg gratings at different positions;
and the position determining module is used for determining the position of the leakage source according to the attenuation behavior relational expression of the ultrasonic wave in the inhomogeneous medium and the sound pressure.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a method and a system for detecting high-pressure hydrogen leakage, wherein the method comprises the following steps: sensing ultrasonic waves generated when hydrogen leakage occurs in the high-pressure hydrogen storage device by using fiber gratings at different preset positions; the fiber grating deforms under the action of the ultrasonic waves; emitting initial light to the fiber bragg grating by using a wide-spectrum light source of a demodulator; the initial light is incident to the fiber grating through the circulator; the initial light generates reflected light on the deformed fiber bragg grating; the reflected light is reflected back to the demodulator; detecting the wavelength of the reflected light by using the demodulator to obtain a specific wavelength; calculating the central wavelength drift amount according to the specific wavelength based on a temperature compensation principle; and judging whether the wavelength drift occurs or not according to the central wavelength drift amount, and if so, determining that the hydrogen leakage accident occurs. Based on the advantages of small volume, wide detection range, high precision, strong stability, good real-time performance and the like of the fiber bragg grating, the invention recognizes the hydrogen leakage by utilizing the stress effect of the ultrasonic wave to the fiber bragg grating on the premise that the leakage source is generated along with the ultrasonic wave when the high-pressure hydrogen is leaked in the hydrogen fuel vehicle, and positions the hydrogen leakage source through the space geometric relationship in the specific implementation mode, thereby improving the accuracy of the detection and the positioning of the high-pressure hydrogen leakage.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a flowchart of a high-pressure hydrogen leak detection method in an embodiment provided by the present invention;
FIG. 2 is a schematic illustration of hydrogen leak detection in a first instance of an embodiment provided by the present invention;
FIG. 3 is a schematic diagram of hydrogen leak detection in a second case in an embodiment provided by the present invention;
fig. 4 is a block diagram of a high-pressure hydrogen leak detection system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The terms "first," "second," "third," and "fourth," etc. in the description and claims of this application and in the accompanying drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, the inclusion of a list of steps, processes, methods, etc. is not limited to only those steps recited, but may alternatively include additional steps not recited, or may alternatively include additional steps inherent to such processes, methods, articles, or devices.
The invention aims to provide a high-pressure hydrogen leakage detection method and a high-pressure hydrogen leakage detection system, which can improve the accuracy of high-pressure hydrogen leakage detection and positioning.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a flowchart of a high-pressure hydrogen leakage detection method in an embodiment provided by the present invention, and as shown in fig. 1, the present invention provides a high-pressure hydrogen leakage detection method, including:
step 100: sensing ultrasonic waves generated when hydrogen leakage occurs in the high-pressure hydrogen storage device by using fiber gratings at different preset positions; the fiber grating deforms under the action of the ultrasonic waves;
step 200: emitting initial light to the fiber bragg grating by using a wide-spectrum light source of a demodulator; the initial light is incident to the fiber grating through the circulator; the initial light generates reflected light on the deformed fiber bragg grating; the reflected light is reflected back to the demodulator;
step 300: detecting the wavelength of the reflected light by using the demodulator to obtain a specific wavelength;
step 400: calculating the central wavelength drift amount according to the specific wavelength based on a temperature compensation principle;
step 500: and judging whether the wavelength drift occurs or not according to the central wavelength drift amount, and if so, determining that the hydrogen leakage accident occurs.
Specifically, when hydrogen leakage occurs at a certain position of the high-pressure hydrogen storage device, supersonic jet flow with a highly under-expanded structure is formed at a hydrogen leakage source and is generated along with ultrasonic waves. Due to the propagation rule and attenuation characteristic of ultrasonic waves, the sound pressure of the ultrasonic waves at different positions around the hydrogen leakage source changes along with the propagation distance, namely the distance from the position to the leakage source.
Preferably, the determining whether a wavelength shift occurs according to the central wavelength shift amount, and if so, after determining that a hydrogen leakage accident occurs, further includes:
determining ultrasonic sound pressure according to the central wavelength drift amount calculated by the fiber bragg gratings at different positions;
and determining the position of the leakage source according to the attenuation behavior relational expression of the ultrasonic wave in the inhomogeneous medium and the sound pressure.
Alternatively, the propagation of ultrasonic waves has the characteristic of non-contact, and the ultrasonic signals propagating in the medium are mainly in the form of mechanical stress waves. The energy of the ultrasonic wave in the transmission process has diffusion attenuation, absorption attenuation and scattering attenuation, and the sound pressure of the ultrasonic wave at different positions in the space is also different. For diffuse attenuation, assuming a point sound source in an infinite medium, the relationship between the propagation distance of a stress wave and the sound pressure is derived. Is provided with a point sound source
Location. The stress wave propagates in an ideal medium of infinite size without energy loss during propagation. When the sound wave propagates to the medium
Position where the sound pressure is p1(ii) a When the sound wave propagates to the medium
Position where the sound pressure is p2(ii) a The ratio of the acoustic pressure die at the two positions being
It is known that, with respect to the diffuse attenuation of the ultrasonic wave, the sound pressure of the point sound source is in inverse proportion to the propagation distance of the sound wave. The relationship between absorption attenuation and scattering attenuation and the propagation distance of the sound wave can be described by an exponential model related to the frequency of the sound wave, and the diffusion is realizedAttenuation is also expressed in an exponential fashion with respect to propagation distance, and ultrasonic waves propagate from heterogeneous media due to various effects
Is propagated to
The attenuation behavior of (c) is as follows:
wherein p is1Is composed of
Acoustic pressure of (p)2Is composed of
The sound pressure of (c).
In the case of a frequency f, in order to
In order to be a reference position for the attenuation,
diffusion attenuation coefficient at the location.
In the case of a frequency f, in order to
In order to be a reference position for the attenuation,
the absorption and scattering attenuation coefficient at a location, also referred to as the material attenuation coefficient. Knowing the sound pressure and propagation of the ultrasonic waves at a certain place in spaceThe distance is related.
Preferably, the formula for determining the sound pressure of the ultrasonic wave according to the center wavelength drift amount calculated by the fiber bragg gratings at different positions is as follows:
wherein λ isBFor the central wavelength of the grating, E represents the modulus of elasticity of the material, neffIs the effective refractive index of the grating, p11、p12A first constant and a second constant associated with the ultrasound propagation medium, respectively; delta lambdaBIs the center wavelength shift amount; p is the ultrasonic sound pressure.
Furthermore, after light emitted by the broad-spectrum light source of the demodulator enters the fiber bragg grating through the circulator, light with specific wavelength is reflected to the demodulating device, and the central wavelength of the reflected light is shifted due to the deformation of the grating. And the central wavelength of the grating at different positions will change due to different reflected light of the pressure wave. The ultrasonic transmission process can be regarded as the simultaneous action of an expansion wave and a compression wave, in which case a certain point in the medium will vibrate along the transmission direction of the waves. As the optical fiber has the strongest ability of sensing the axial stress, the ultrasonic waves are mainly propagated along the axial direction of the optical fiber grating in a longitudinal stress wave mode, and the grating region structure of the optical fiber grating generates axial strain under the action of the ultrasonic waves. When the fiber grating is subjected to the action of periodic stress, the axial direction of the fiber grating can form dynamic expansion and contraction, so that the structure and the characteristics of the grating are periodically changed, and the central wavelength of reflected light of the grating is changed; reflected light of the gratings at different positions is reflected back to the demodulator, and specific wavelength is measured through photoelectric conversion and wavelength detection; and calculating the central wavelength drift amount through temperature compensation processing, and identifying the occurrence of the hydrogen leakage accident if the wavelength drift occurs.
Alternatively, if a wavelength shift occurs, the relationship between the wavelength shift amount of the fiber grating and the ultrasonic sound pressure p is as follows:
wherein λ isBFor the central wavelength of the grating, E represents the modulus of elasticity of the material, neffIs the effective refractive index of the grating, p11、p12Is a constant associated with the ultrasonic propagation medium.
Preferably, the determining the position of the leakage source according to the attenuation behavior relation of the ultrasonic wave in the inhomogeneous medium and the sound pressure comprises:
determining the distance between the first position and a leakage source according to the preset sound pressure and the attenuation behavior relational expression of the first position, and recording as a first distance;
determining the distance between the second position and a leakage source according to the preset sound pressure and the attenuation behavior relational expression of the second position, and recording the distance as a second distance;
determining the distance between the first position and the second position, and recording as a third distance;
determining the leakage source location from the first distance, the second distance, and the third distance based on a geometric relationship of triangles.
As an alternative, according to the wavelength drift measured by the gratings at different positions, the sound pressure can be derived according to equation (3), and then the propagation distance of the sound wave to the grating at that position can be derived according to equation (2). As shown in fig. 2 and 3, the hydrogen leakage direction in fig. 2 is perpendicular to the axial direction of the grating, the hydrogen leakage direction in fig. 3 is not perpendicular to the axial direction of the grating, the O point is set as a leakage source, the M-th scale grating is set as the M-th scale grating, and the N-th scale grating is set as the N-th scale grating, and the position of the leakage source can be obtained according to the geometric relationship of the triangle. The shift amount of the center wavelength detected at the mth scale grating is delta lambdamThe sound pressure p experienced by the grating can be derived from equation (3)mThe propagation distance r of the acoustic wave from the leakage source can be derived from the formula (2)m(ii) a The drift amount of the center wavelength detected at the nth scale grating is delta lambdanThe sound pressure p experienced by the grating can be derived from equation (3)nThe propagation distance r of the sound wave from the leakage source can be derived from the formula (2)nNamely:
Δλm→pm→rm Δλn→pn→rn
in the triangle ONM, the length of the side NM is the distance between the mth scale grating and the nth scale grating, which is easily obtained by calculating the grating distance of the gratings, and the length of the side OM is rmON side length of rnThe sizes of the three sides of the triangle, namely the NM, OM and ON are known, the position of the side NM is determined, and the position of the O point, namely the position of the leakage source, can be determined according to the geometric relation of the triangle. Fig. 2 shows a case where the hydrogen leakage direction is perpendicular to the axial direction of the grating, and fig. 3 shows a case where the hydrogen leakage direction is not perpendicular to the axial direction of the grating.
Further, the combination of the gratings at different positions can deduce a leakage source position set, and finally the leakage source position is determined according to the position source set.
Preferably, the formula of the attenuation behavior relation is:
wherein p is1Is the sound pressure at the first location and,
is said first distance, p2Is the sound pressure at the second location and,
is the second distance, f is the frequency,
in the case of frequency f, in order to
In order to be a reference position for the attenuation,
the diffusion attenuation coefficient at the location of the location,
in the case of frequency f, in order to
In order to be a reference position for the attenuation,
absorption and scattering attenuation coefficients at the location.
Fig. 4 is a module connection diagram of a high-pressure hydrogen leakage detection system in an embodiment provided by the present invention, and as shown in fig. 4, the embodiment further provides a high-pressure hydrogen leakage detection system, which specifically includes:
the ultrasonic sensing module is used for sensing ultrasonic waves generated when hydrogen leakage occurs in the high-pressure hydrogen storage device by using fiber gratings at different preset positions; the fiber grating deforms under the action of the ultrasonic waves;
the transmitting module is used for transmitting initial light to the fiber bragg grating by using a wide-spectrum light source of the demodulator; the initial light is incident to the fiber grating through the circulator; the initial light generates reflected light on the deformed fiber bragg grating; the reflected light is reflected back to the demodulator;
the wavelength detection module is used for detecting the wavelength of the reflected light by using the demodulator to obtain a specific wavelength;
the calculation module is used for calculating the central wavelength drift amount according to the specific wavelength based on the temperature compensation principle;
and the accident determining module is used for judging whether the wavelength drift occurs according to the central wavelength drift amount, and if so, determining that the hydrogen leakage accident occurs.
Preferably, the method further comprises the following steps:
the sound pressure determining module is used for determining ultrasonic sound pressure according to the central wavelength drift amount calculated by the fiber gratings at different positions;
and the position determining module is used for determining the position of the leakage source according to the attenuation behavior relational expression of the ultrasonic wave in the inhomogeneous medium and the sound pressure.
The invention has the following beneficial effects:
(1) the fiber grating sensor is arranged in a high-pressure hydrogen use place to detect hydrogen leakage, does not need to be powered as a passive device, has the characteristic of strong anti-electromagnetic interference capability, and cannot become an ignition source when hydrogen leaks;
(2) the hydrogen leakage is detected by the stress action of the ultrasonic wave generated when the high-pressure hydrogen leaks on the fiber grating sensor, compared with the hydrogen leakage detection of the chemical reaction type hydrogen sensor and other types, the detection speed is higher, and the fiber grating sensor has the advantages of high precision, good stability, long transmission distance, good real-time performance and the like;
(3) the array fiber bragg grating sensor is adopted, the detection range is wide, and the position layout research of multiple hydrogen sensors is not needed; the array fiber grating sensor can also estimate the position of the leakage source through the grating detection quantity at different positions based on the space geometric relationship.
(4) The invention is non-contact detection without arranging a sensor on the bottle body of the high-pressure hydrogen storage bottle.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the description of the method part.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (7)
1. A high-pressure hydrogen leak detection method characterized by comprising:
sensing ultrasonic waves generated when hydrogen leakage occurs in the high-pressure hydrogen storage device by using fiber gratings at different preset positions; the fiber grating deforms under the action of the ultrasonic waves;
emitting initial light to the fiber bragg grating by using a wide-spectrum light source of a demodulator; the initial light is incident to the fiber grating through the circulator; the initial light generates reflected light on the deformed fiber bragg grating; the reflected light is reflected back to the demodulator;
detecting the wavelength of the reflected light by using the demodulator to obtain a specific wavelength;
calculating the central wavelength drift amount according to the specific wavelength based on a temperature compensation principle;
and judging whether the wavelength drift occurs or not according to the central wavelength drift amount, and if so, determining that the hydrogen leakage accident occurs.
2. The method according to claim 1, wherein the determining whether a wavelength shift occurs according to the central wavelength shift amount, and if so, determining that a hydrogen leakage accident has occurred, further comprises:
determining ultrasonic sound pressure according to the central wavelength drift amount calculated by the fiber bragg gratings at different positions;
and determining the position of the leakage source according to the attenuation behavior relational expression of the ultrasonic wave in the inhomogeneous medium and the sound pressure.
3. The method according to claim 2, wherein the formula for determining the sound pressure of the ultrasonic wave based on the shift amount of the center wavelength calculated by the fiber grating at different positions is:
wherein λ isBFor the center wavelength of the grating, E represents the elastic modulus of the material，neffIs the effective refractive index of the grating, p11、p12A first constant and a second constant associated with the ultrasonic propagation medium, respectively; delta lambdaBIs the center wavelength shift amount; p is the ultrasonic sound pressure.
4. The high-pressure hydrogen leakage detection method according to claim 2, wherein the determining a leakage source position from the sound pressure and the attenuation behavior relation of the ultrasonic wave in the inhomogeneous medium includes:
determining the distance between the first position and a leakage source according to the preset sound pressure and the attenuation behavior relational expression of the first position, and recording as a first distance;
determining the distance between the second position and a leakage source according to the preset sound pressure and the attenuation behavior relational expression of the second position, and recording the distance as a second distance;
determining the distance between the first position and the second position, and recording as a third distance;
determining the leakage source location from the first distance, the second distance, and the third distance based on a geometric relationship of triangles.
5. The high pressure hydrogen leak detection method according to claim 4, wherein the attenuation behavior relational expression is represented by:
wherein p is1Is the sound pressure at the first location and,
is said first distance, p2Is the sound pressure at the second location and,
is the second distance, f is the frequency,
in the case of frequency f, in order to
In order to be a reference position for the attenuation,
the diffusion attenuation coefficient at the location of the location,
in the case of frequency f, in order to
In order to be a reference position for the attenuation,
absorption and scattering attenuation coefficients at the location.
6. A high-pressure hydrogen leak detection system, comprising:
the ultrasonic sensing module is used for sensing ultrasonic waves generated when hydrogen leakage occurs in the high-pressure hydrogen storage device by using fiber gratings at different preset positions; the fiber grating deforms under the action of the ultrasonic waves;
the transmitting module is used for transmitting initial light to the fiber bragg grating by using a wide-spectrum light source of the demodulator; the initial light is incident to the fiber grating through the circulator; the initial light generates reflected light on the deformed fiber bragg grating; the reflected light is reflected back to the demodulator;
the wavelength detection module is used for detecting the wavelength of the reflected light by using the demodulator to obtain a specific wavelength;
the calculation module is used for calculating the central wavelength drift amount according to the specific wavelength based on the temperature compensation principle;
and the accident determining module is used for judging whether the wavelength drift occurs according to the central wavelength drift amount, and if so, determining that the hydrogen leakage accident occurs.
7. The high pressure hydrogen leak detection system according to claim 6, further comprising:
the sound pressure determining module is used for determining the sound pressure of the ultrasonic wave according to the central wavelength drift amount calculated by the fiber bragg gratings at different positions;
and the position determining module is used for determining the position of the leakage source according to the attenuation behavior relational expression of the ultrasonic wave in the inhomogeneous medium and the sound pressure.
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| CN117629534A (en) * | 2023-11-28 | 2024-03-01 | 北京航天试验技术研究所 | Gas leakage detection method and device and gas leakage sample collection system |
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