Detector and measurement method for leak detection in confined spaces using infrasound technology

Abstract

The present invention proposes a detector and a measurement method for detecting leaks in a confined space using infrasonic technology. The detector for detecting leaks in a confined space using infrasonic technology includes a gas leak detector and a closed container leak detector; the closed container leak detector is arranged in the confined space to be detected. The measurement method includes: placing the closed container leak detector in the closed container to be detected; the infrasonic generator of the closed container leak detector generates infrasonic waves to detect the target area, and the infrasonic waves generated by the infrasonic generator are detected by a receiving probe; headphones are used to receive the friction sound between the gas molecules detected by the gas leak detection module and the outlet of the damaged closed container, and the leak position is located based on the principle of linear propagation of infrasonic waves to obtain the gas leak position.

Description

Technical Field

[0001] The invention discloses a detector and a measuring method for detecting leakage in a closed space by utilizing infrasonic wave technology, belonging to the technical field of leakage detection of sealing components. Background Art

[0002] Leak detection in confined spaces (such as storage tanks, pipelines, and reactors) is crucial in a variety of fields, including industrial production, energy supply, and environmental protection. Leaks not only waste resources but can also cause environmental pollution, equipment damage, and even safety incidents. Therefore, developing efficient and accurate leak detection technology is crucial.

[0003] Traditional leak detection methods, such as bubble detection, water flow detection, sound detection, and pressure change detection, while able to meet leak detection needs to a certain extent, have numerous shortcomings. For example, bubble detection and water flow detection can contaminate products, are inefficient, and cannot be automated. Sound detection is limited by ambient noise and operator experience, making detection accuracy and reliability difficult to guarantee. Pressure change detection requires additional pressure sources and monitoring equipment, increasing detection costs and complexity.

[0004] In recent years, with the development of acoustic wave technology, the application of infrasound technology in leak detection has gradually attracted attention. Infrasound refers to sound waves with a frequency range below 20Hz. It has the characteristics of slow propagation speed and can penetrate solids, liquids, and gases. Infrasound generators, based on core components such as piezoelectric ceramics, generate infrasound waves of a specific frequency and transmit them to the detection point via wireless communication. When infrasound waves encounter leaks during propagation, they undergo physical phenomena such as reflection and refraction. These phenomena can be captured by infrasound detectors and converted into electrical signals for analysis.

[0005] However, the leak detectors and measurement methods currently available on the market still have some limitations. For example, the accuracy and stability of some detectors need to be improved; some measurement methods are complex and require specialized personnel; and existing infrasonic leak detectors and measurement methods may not be suitable for leak detection in certain special environments (such as high temperature, high pressure, and corrosive media). Summary of the Invention

[0006] The present invention provides a detector and a measurement method for detecting leakage in a confined space using infrasound technology, in order to solve the technical problems existing in the above-mentioned prior art. The technical solutions adopted are as follows:

[0007] A detector for detecting leaks in a confined space using infrasound technology, comprising a gas leak detector and a closed container leak detector; the closed container leak detector is arranged in the confined space to be detected.

[0008] Furthermore, the gas leak detector includes an outer shell, a detection component group, a back cover, a pointer-type DC voltmeter and a battery component; wherein the circuit board where the detection component group is located is arranged in the shell of the outer shell and fixed to the inside of the shell by a fixing member; the pointer-type DC voltmeter and the battery component are respectively fixed in the shell of the outer shell by fixing members; the outer shell is encapsulated by a full-enclosed back cover.

[0009] Furthermore, the battery component includes a battery container, a battery and a battery cover; the battery is arranged in the battery container and sealed by the battery cover; wherein the battery container is fixed to the inside of the shell by a fixing member.

[0010] Furthermore, the detection component group includes a receiving probe, a signal processing module and an earphone; wherein the signal output end of the receiving probe is connected to the signal input end of the signal processing module; the signal output end of the signal processing module is connected to the signal end of the earphone.

[0011] Furthermore, the receiving probe adopts R1114N301B-F antenna.

[0012] Furthermore, the signal processing module includes a power supply, a local oscillator and a signal processing circuit module; the power signal output end of the power supply is connected to the power supply signal input end of the filter of the signal processing circuit module.

[0013] Furthermore, the signal processing circuit module includes an RF amplifier, a filter, an IF amplifier, an AM detector and an audio amplifier; wherein the signal input end of the RF amplifier is the signal input end of the signal processing module; the signal output end of the RF amplifier is connected to the signal input end of the filter; the signal output end of the filter is connected to the signal input end of the IF amplifier; the signal output end of the IF amplifier is connected to the signal input end of the AM detector; the signal output end of the AM detector is respectively connected to the signal input end of the RF amplifier and the signal input end of the audio amplifier; the signal output end of the audio amplifier is the signal output end of the signal processing module.

[0014] Furthermore, the sealed container leakage detection module includes an infrasound generator, wherein the infrasound generator includes a generator upper shell, a generator lower shell and a control circuit board.

[0015] A measuring method for a detector for detecting leakage in a confined space using infrasound technology, the measuring method comprising:

[0016] placing the closed container leak detector in the closed container to be detected;

[0017] The infrasound generator of the closed container leakage detector generates infrasound waves to detect the target area, and the receiving probe detects the infrasound waves generated by the infrasound generator;

[0018] Earphones are used to receive the friction sound between the gas molecules detected by the gas leak detection module and the outlet of the damaged closed container, and the leakage position is located based on the principle of linear propagation of infrasonic sound waves to obtain the gas leakage position.

[0019] Furthermore, the measurement method further includes:

[0020] extracting the container space volume of the sealed container;

[0021] The target sound wave intensity of the infrasound generator is obtained according to the container space volume of the sealed container, wherein the target sound wave intensity is obtained by the following formula:

[0022]

[0023] Where, I represents the target sound wave intensity; I0 represents the initial sound wave intensity of the preset infrasound generator; S max and S min They represent the maximum area and minimum area of ​​the cross section of the sealed container perpendicular to the direction of passage of the sound wave; S e It represents the area perpendicular to the propagation direction through which the sound wave passes, corresponding to the initial sound wave intensity, under the preset sound power standard value; n represents the number of cross sections of different sizes; S i represents the area corresponding to the cross section of the i-th dimension; V max V represents the volume of the region space corresponding to the maximum area of ​​the cross section of the sealed container perpendicular to the direction of passage of the sound wave; min V represents the volume of the region space corresponding to the minimum area of ​​the cross section of the sealed container perpendicular to the direction of sound wave passing; z represents the overall volume of the closed container; s represents the compensation coefficient;

[0024] The infrasound wave generator is adjusted according to the target sound wave intensity so that the sound wave intensity of the infrasound wave generator reaches the preset target sound wave intensity.

[0025] Beneficial effects of the present invention:

[0026] The present invention proposes a detector and measurement method for detecting leaks in confined spaces using infrasound technology. The gas leak detector and closed container leak detector, respectively, utilize infrasound technology to efficiently detect gas and closed container leaks. The gas leak detector utilizes a specialized receiving probe and signal processing module to accurately receive and process infrasound signals, enabling rapid location of the leak source. The closed container leak detector, on the other hand, generates infrasound waves through a built-in infrasound generator. When the infrasound waves encounter the leak point, they produce specific physical phenomena, enabling accurate leak detection. Compared to traditional detection methods, the infrasound-based detection method does not require applying or adding any substances to the object being tested, resulting in no contamination and a non-invasive detection method. This not only maintains product integrity but also avoids secondary damage to the equipment. The detectors in this technical solution have high sensitivity and reliability. The gas leak detector utilizes a specialized signal processing module to amplify, filter, and detect the received infrasound signals, improving the signal-to-noise ratio and interference resistance, thereby enhancing detection sensitivity and reliability. The closed container leak detector uses a built-in infrasound generator to generate a stable infrasound signal, ensuring the accuracy and reliability of detection. The detector in this technical solution has a simple design and is easy to operate. The gas leak detector uses a pointer-type DC voltmeter and a battery component for power supply and status display. The user only needs to observe the voltmeter's indication to understand the working status of the device. The closed container leak detector controls the infrasound generator through a control circuit board. The user only needs to follow the operating instructions to detect leaks in closed containers. This technical solution is suitable for leak detection in a variety of environments. Whether it is a confined space such as a storage tank or pipeline in industrial production or a reactor in a laboratory, as long as there is a risk of leakage, it can be detected through this technical solution. At the same time, this technical solution can also meet the needs of leak detection in special environments such as high temperature, high pressure, and corrosive media. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 An exploded view of the gas leak detector of the present invention;

[0028] Figure 2 This is a circuit diagram of the gas leak detector of the present invention;

[0029] Figure 3 This is an exploded view of the closed container leakage detector of the present invention;

[0030] Figure 4 This is a circuit schematic diagram of the control circuit board of the infrasound generator described in the present invention. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0032] The embodiment of the present invention proposes a detector for detecting leakage in a confined space using infrasound technology, such as Figure 1 As shown, the detector for detecting leakage in a closed space using infrasonic technology includes a gas leakage detector and a closed container leakage detector; the closed container leakage detector is arranged in the closed space to be detected.

[0033] The gas leak detector includes an outer shell, a detection component assembly, a back cover, a pointer-type DC voltmeter, and a battery assembly. The circuit board containing the detection component assembly is disposed within the outer shell and secured to the interior of the shell via fasteners. The pointer-type DC voltmeter and battery assembly are each secured to the outer shell via fasteners. The outer shell is enclosed by a fully enclosed back cover. Specifically, the battery assembly includes a battery container, a battery, and a battery cover. The battery is disposed within the battery container and sealed by the battery cover. The battery container is secured to the interior of the shell via fasteners.

[0034] The detection component group includes a receiving probe, a signal processing module, and headphones. The signal output of the receiving probe is connected to the signal input of the signal processing module, which is in turn connected to the signal input of the headphones. Specifically, the receiving probe uses an R1114N301B-F antenna. The signal processing module includes a power supply, a local oscillator, and a signal processing circuit module. The power signal output of the power supply is connected to the power signal input of the filter of the signal processing circuit module. The signal processing circuit module includes an RF amplifier, a filter, an IF amplifier, an AM detector, and an audio amplifier. The signal input of the RF amplifier is also the signal input of the signal processing module. The signal output of the RF amplifier is connected to the signal input of the filter. The signal output of the filter is connected to the signal input of the IF amplifier. The signal output of the IF amplifier is connected to the signal input of the AM detector. The signal output of the AM detector is respectively connected to the signal input of the RF amplifier and the signal input of the audio amplifier. The signal output of the audio amplifier is also the signal output of the signal processing module.

[0035] Wherein, the closed container leakage detection module includes an infrasound generator, wherein the infrasound generator includes a generator upper shell, a generator lower shell and a control circuit board.

[0036] The working principle of the above technical solution is: the detector converts ultrasonic signals into audible sounds and amplifies them. It uses high-frequency signals generated by operating equipment failures, vibrations, leakages and electrical partial discharges. It applies the heterodyning principle to convert these signals into audio signals, allowing users to hear these sounds through headphones and see the intensity indication on the pointer. The heterodyning principle is like a radio that can accurately convert signals into sounds, making it easy for people to identify and understand. Figure 2 As shown, the R1114N301B-F antenna receives signals from the entire AM broadcast band, from 535 to 1605 kHz, and transmits them to a radio frequency (RF) amplifier. The AM band signal is called a carrier wave, and at the transmitting station, it can be modulated using an audio signal. Amplitude modulation varies the carrier wave's amplitude according to the audio signal. The RF amplifier selects a desired frequency from all received signals and amplifies this tiny signal from the antenna. As a tuned amplifier, it is highly frequency selective, essentially eliminating all signals other than the selected frequency. The AM signal amplified by the RF amplifier enters a mixer, where it is combined with a signal from a local oscillator, which is 455 kHz higher than the carrier frequency. Through a process called heterodyning, the mixer generates a set of output frequencies equal to the sum and difference frequencies of the selected carrier frequency and the local oscillator frequency. The sum frequency is filtered, leaving only the difference frequency of 455 kHz. The 455kHz intermediate frequency (IF) still carries the same audio modulation information as the carrier frequency. The IF amplifier is tuned to 455kHz to amplify the signal. The detector receives the AM signal from the IF amplifier and removes the IF to extract the audio signal. The tiny audio signal output from the detector is amplified by an audio amplifier circuit, consisting of a preamplifier and a power amplifier. The power amplifier then drives the speaker, converting the audio signal into sound.

[0037] like Figure 3 and Figure 4 As shown, the infrasound generator is primarily used to generate infrasound waves. It consists of an upper and lower housing, and a control circuit board, which is equipped with nine signal-generating units. To use it, the generator can be placed in a confined space and turned on to generate infrasound waves. The signal intensity can also be adjusted using a remote control.

[0038] The above technical solution achieves the following: the gas leak detector and the closed container leak detector respectively use infrasound technology to efficiently detect gas leaks and closed container leaks. The gas leak detector uses a specialized receiving probe and signal processing module to accurately receive and process infrasound signals, thereby quickly locating the leak source. The closed container leak detector, on the other hand, generates infrasound waves through a built-in infrasound generator. When the infrasound waves encounter the leak point, they produce specific physical phenomena, thus accurately detecting the leak.

[0039] Compared to traditional detection methods, infrasound technology-based detection methods do not require applying or adding any substances to the object being tested, resulting in no product contamination and a non-invasive testing method. This not only maintains product integrity but also prevents secondary damage to the equipment. The detectors in this technical solution offer high sensitivity and reliability. Gas leak detectors utilize a specialized signal processing module to amplify, filter, and detect received infrasound signals, improving the signal-to-noise ratio and interference immunity, thereby enhancing detection sensitivity and reliability. Sealed container leak detectors utilize a built-in infrasound generator to generate a stable infrasound signal, ensuring detection accuracy and reliability. The detectors in this technical solution feature a simple design and are easy to operate. The gas leak detector utilizes an analog DC voltmeter and battery for power and status display, allowing users to monitor the device's operating status simply by observing the voltmeter's indication. The sealed container leak detector utilizes a control circuit board to control the infrasound generator, allowing users to simply follow the operating instructions to detect leaks in sealed containers. This technical solution is suitable for leak detection in a variety of environments. Whether it's a confined space like a storage tank or pipeline in industrial production or a reactor in a laboratory, this technology can be used to detect leaks wherever there's a risk of leakage. It can also adapt to leak detection needs in special environments like high temperature, high pressure, and corrosive media.

[0040] In summary, this technical solution has the technical effects of efficient and accurate leak detection, non-invasive detection, high sensitivity and high reliability, simple operation and strong applicability.

[0041] The embodiment of the present invention provides a measurement method for a detector for detecting leakage in a confined space using infrasound technology, the measurement method comprising:

[0042] Step 1: placing the sealed container leak detector in the sealed container to be detected;

[0043] Step 2: The infrasound generator of the sealed container leakage detector generates infrasound waves to detect the target area, and the infrasound waves generated by the infrasound generator are detected by a receiving probe;

[0044] Step 3: Use headphones to receive the friction sound between the gas molecules detected by the gas leak detection module and the outlet of the damaged closed container, and locate the leak position based on the principle of linear propagation of infrasonic sound waves to obtain the gas leak position.

[0045] The measuring method further comprises:

[0046] S1. extracting the container space volume of the sealed container;

[0047] S2. Obtaining a target sound wave intensity of the infrasound generator according to the container space volume of the sealed container, wherein the target sound wave intensity is obtained by the following formula:

[0048]

[0049] Where, I represents the target sound wave intensity; I0 represents the initial sound wave intensity of the preset infrasound generator; S max and S min They represent the maximum area and minimum area of ​​the cross section of the sealed container perpendicular to the direction of passage of the sound wave; S e It represents the area perpendicular to the propagation direction through which the sound wave passes, corresponding to the initial sound wave intensity, under the preset sound power standard value; n represents the number of cross sections of different sizes; S i represents the area corresponding to the cross section of the i-th dimension; V max V represents the volume of the region space corresponding to the maximum area of ​​the cross section of the sealed container perpendicular to the direction of passage of the sound wave; min V represents the volume of the region space corresponding to the minimum area of ​​the cross section of the sealed container perpendicular to the direction of sound wave passing; z represents the overall volume of the closed container; s represents the compensation coefficient;

[0050] S3. Adjust the infrasound generator according to the target sound wave intensity so that the sound wave intensity of the infrasound generator reaches a preset target sound wave intensity.

[0051] The working principle of the above technical solution is as follows: a detector and auxiliary probe are used to detect areas with potential leaks. Headphones are used to receive the friction sound of gas molecules rubbing against the damaged outlet of the sealed container, detected by the detector. Based on the principle of rectilinear propagation of sound waves, the leak location is located. This detection method is highly adaptable and accurate, capable of detecting leaks as low as 25 air molecules per minute. It is also applicable not only to positive pressure leak detection but also to negative pressure leak detection. It can be used for contact detection or remote detection up to 15 meters using an auxiliary probe. An infrasound generator is placed in the confined space and turned on to generate infrasound. The detector and auxiliary probe are used to detect areas with potential leaks. The headphones receive the infrasound waves detected by the detector. If the sound waves are attenuated due to the large size of the confined space, the sound wave intensity of the generator can be adjusted using a remote control. Based on the principle of rectilinear propagation of sound waves, the leak location is located. This method is suitable for leak detection in various types of confined spaces.

[0052] The above technical solution provides the following benefits: The detection method based on infrasound technology does not require applying or adding any substances to the object being tested, resulting in no product contamination. It is a non-invasive detection method. This not only maintains product integrity but also prevents secondary damage to the equipment. The detectors in this technical solution have high sensitivity and reliability. The gas leak detector uses a specialized signal processing module to amplify, filter, and detect the received infrasound signal, improving the signal-to-noise ratio and interference resistance, thereby enhancing detection sensitivity and reliability. The sealed container leak detector, on the other hand, uses a built-in infrasound generator to generate a stable infrasound signal, ensuring detection accuracy and reliability. The detectors in this technical solution feature a simple design and are easy to operate. The gas leak detector uses an analog DC voltmeter and a battery for power supply and status display. Users simply observe the voltmeter's indication to understand the device's operating status. The sealed container leak detector uses a control circuit board to control the infrasound generator. Users simply follow the operating instructions to detect leaks in sealed containers. This technical solution is suitable for leak detection in a variety of environments. Whether it's a confined space like a storage tank or pipeline in industrial production or a reactor in a laboratory, this technology can be used to detect leaks wherever there's a risk of leakage. It can also adapt to leak detection needs in special environments like high temperature, high pressure, and corrosive media.

[0053] On the other hand, by extracting the spatial volume of the closed container and determining the target sound wave intensity of the infrasound generator based on the spatial volume of the container, this step ensures that the sound wave intensity setting matches the size and shape of the container. This personalized sound wave intensity setting makes detection more precise and can effectively improve the accuracy of leak detection. The sound wave intensity of the infrasound generator is dynamically adjusted according to the spatial volume of the closed container, avoiding the problem of poor detection results caused by too high or too low sound wave intensity. This optimization method can maximize the advantages of infrasound technology and improve the efficiency of leak detection. This technical solution can adapt to closed containers of different sizes and shapes. Whether the container is a large storage tank or a small reactor, the target sound wave intensity suitable for the container can be obtained through simple parameter extraction and calculation. This wide adaptability makes this technical solution have broad application prospects.

[0054] The technical solution's operation steps are simple and clear. It simply requires determining the volume of the sealed container, calculating the target sound wave intensity using a preset formula, and then adjusting the infrasound generator according to the target sound wave intensity. This simple operation reduces operational difficulty and improves detection efficiency. By precisely setting the sound wave intensity, the technical solution ensures that no damage is caused to the sealed container or the substances within during the detection process. Furthermore, due to the non-invasive nature of infrasound technology, this technical solution can complete leak detection without damaging the container structure, further ensuring the safety of the detection process.

[0055] At the same time, by considering the specific shape and size of the closed container (such as cross-sections of different sizes, the regional spatial volumes corresponding to the maximum and minimum cross-sections, etc.), combined with the preset initial sound wave intensity and sound power standards, the target sound wave intensity can be calculated more accurately. This helps to improve the accuracy of the sound wave intensity adjustment. By calculating the area corresponding to cross-sections of different sizes and the corresponding regional spatial volumes, the unevenness of sound wave propagation in the container can be taken into account. Adjusting the sound wave intensity of the infrasound generator according to these parameters helps to achieve a more uniform sound wave distribution in the container. This technical solution is not limited to closed containers of a specific shape or size, but calculates the target sound wave intensity based on the actual shape and size of the container. Therefore, this technical solution has strong adaptability and can be applied to closed containers of different shapes and sizes. Once the calculation formula and parameters of the target sound wave intensity are determined, the target sound wave intensity can be obtained through simple mathematical operations. Then, the infrasound generator is adjusted according to the calculated target sound wave intensity, and the operation is relatively simple. By adjusting the infrasound generator's sound intensity, it's possible to ensure that the sound waves propagate within a sealed container within a safe range, thereby preventing damage to the container or its contents. By employing a clear calculation method and parameters, this technical solution ensures consistent results each time the infrasound generator is adjusted, resulting in high repeatability.

[0056] In summary, this technical solution offers the advantages of efficient and accurate leak detection, non-invasive detection, high sensitivity and reliability, ease of operation, and strong applicability. Furthermore, by precisely setting the acoustic wave intensity, optimizing detection efficiency, achieving strong adaptability, ease of operation, and ensuring safety, this technical solution achieves efficient, accurate, and safe leak detection for sealed containers.

[0057] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A detector for detecting leaks in confined spaces using infrasound technology, characterized in that: The detector for detecting leakage in a confined space using infrasound technology includes a gas leakage detector and a closed container leakage detector; the closed container leakage detector is arranged in the confined space to be detected; the measurement method using the detector includes: S1. extracting the container space volume of the sealed container; S2. Obtaining a target sound wave intensity of the infrasound generator according to the container space volume of the sealed container, wherein the target sound wave intensity is obtained by the following formula: in, I Indicates the target sound wave intensity; I 0 represents the preset initial sound wave intensity of the infrasound generator; S max and S min Respectively represent the maximum area and minimum area of ​​the cross section of the sealed container perpendicular to the direction of passage of the sound wave; S e Indicates the area perpendicular to the propagation direction through which the sound wave passes, corresponding to the initial sound wave intensity, under the preset sound power standard value; n Indicates the number of cross sections of different sizes; S i Indicates the i The area corresponding to the cross section of each size; V max The volume of the space corresponding to the maximum area of ​​the cross section of the sealed container perpendicular to the direction of passage of the sound wave; V min The volume of the region space corresponding to the minimum area of ​​the cross section of the sealed container perpendicular to the direction of passage of the sound wave; V z Indicates the overall volume of a closed container; s represents the compensation coefficient; S3. Adjust the infrasound generator according to the target sound wave intensity so that the sound wave intensity of the infrasound generator reaches a preset target sound wave intensity.

2. The detector for detecting leakage in a confined space using infrasound technology according to claim 1, characterized in that: The gas leak detector includes an outer shell, a detection component group, a back cover, a pointer-type DC voltmeter, and a battery component; wherein the circuit board containing the detection component group is arranged in the shell of the outer shell and fixed to the inside of the shell by a fixing member; the pointer-type DC voltmeter and the battery component are respectively fixed to the shell of the outer shell by fixing members; and the outer shell is encapsulated by a full-enclosed back cover.

3. The detector for detecting leakage in a confined space using infrasound technology according to claim 2, characterized in that: The battery component includes a battery container, a battery and a battery cover; the battery is arranged in the battery container and sealed by the battery cover; wherein the battery container is fixed to the inside of the shell by a fixing member.

4. The detector for detecting leakage in a confined space using infrasound technology according to claim 2, characterized in that: The detection component group includes a receiving probe, a signal processing module and an earphone; wherein the signal output end of the receiving probe is connected to the signal input end of the signal processing module; the signal output end of the signal processing module is connected to the signal end of the earphone.

5. The system for detecting and controlling leakage in a confined space using infrasound technology according to claim 4, characterized in that: The receiving probe adopts R1114N301B-F antenna.

6. The detector for detecting leakage in a confined space using infrasound technology according to claim 4, characterized in that: The signal processing module includes a power supply, a local oscillator and a signal processing circuit module; the power signal output end of the power supply is connected to the power supply signal input end of the filter of the signal processing circuit module.

7. The detector for detecting leakage in a confined space using infrasound technology according to claim 6, characterized in that: The signal processing circuit module includes an RF amplifier, a filter, an IF amplifier, an AM detector and an audio amplifier; wherein the signal input end of the RF amplifier is the signal input end of the signal processing module; the signal output end of the RF amplifier is connected to the signal input end of the filter; the signal output end of the filter is connected to the signal input end of the IF amplifier; the signal output end of the IF amplifier is connected to the signal input end of the AM detector; the signal output end of the AM detector is respectively connected to the signal input end of the RF amplifier and the signal input end of the audio amplifier; the signal output end of the audio amplifier is the signal output end of the signal processing module.

8. The detector for detecting leakage in a confined space using infrasound technology according to claim 4, characterized in that: The closed container leakage detector includes an infrasound wave generator, wherein the infrasound wave generator includes an upper generator shell, a lower generator shell and a control circuit board.

9. A measuring method for detecting leakage in a confined space using an infrasound wave technique as claimed in claim 1, characterized in that: The measuring method comprises: placing the closed container leak detector in the closed container to be detected; The infrasound generator of the closed container leakage detector generates infrasound waves to detect the target area, and the receiving probe detects the infrasound waves generated by the infrasound generator; Earphones are used to receive the friction sound between the gas molecules detected by the gas leak detection module and the outlet of the damaged closed container, and the leakage position is located based on the principle of linear propagation of infrasonic sound waves to obtain the gas leakage position.

10. The measuring method of the detector for detecting leakage in a closed space using infrasound technology according to claim 9, characterized in that: The measuring method further comprises: extracting the container space volume of the sealed container; obtaining a target sound wave intensity of an infrasound generator according to the container space volume of the sealed container; The infrasound wave generator is adjusted according to the target sound wave intensity so that the sound wave intensity of the infrasound wave generator reaches the preset target sound wave intensity.

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