Vibration-proof sensitization gas photoacoustic in-situ detection mechanism, detection system and method

Abstract

The invention discloses an anti-vibration sensitization gas photoacoustic in-situ detection mechanism, detection system and method, the mechanism comprises an excitation light source and collimation assembly, a photoacoustic cell and a signal processing unit, laser emitted by the excitation light source and collimation assembly is arranged along the central axis of the photoacoustic cell, and a plurality of groups of microphones are arranged on the central section of the photoacoustic cell; each group of microphones comprises two microphones which are symmetrically arranged on the left side and the right side or the upper side and the lower side of the central cross section of the photoacoustic cell, the signal processing unit receives signals of each microphone and processes the signals, and the central cross section of the photoacoustic cell is a cross section which is located in the middle of the photoacoustic cell and is perpendicular to the axial direction of the photoacoustic cell. The excitation light source and the collimation assembly emit laser, the signal processing unit collects and processes signals of the multiple sets of microphones, and the concentration of the dissolved gas in the detection oil way is obtained according to the corresponding matching relation between the signal processing result of the signal processing unit and the gas concentration.

Description

Technical Field

[0001] This invention relates to the field of gas detection equipment technology, specifically to a vibration-resistant and sensitizing in-situ photoacoustic gas detection mechanism, detection system, and method. Background Technology

[0002] Photoacoustic spectroscopy is a gas detection technique based on the photoacoustic effect. Its principle is to utilize the absorption of modulated laser light of a specific wavelength by gas molecules to generate sound waves, and then determine the gas concentration by detecting the sound wave signal. In recent years, photoacoustic spectroscopy has been widely used in the field of gas detection due to its advantages such as high sensitivity, high selectivity, and fast response. Especially in power systems, the detection of dissolved gases in oil is of great significance for condition monitoring and fault diagnosis of equipment such as transformers.

[0003] Traditional photoacoustic spectroscopy gas detection systems typically employ a single microphone to detect acoustic signals. For example, CN116183514A discloses a photoacoustic cell and a multi-component gas detection system. This system includes a cell, a first cavity, a buffer chamber, a second cavity, and an optical glass window. By increasing the number of incident windows, multiple beams are introduced, improving detection efficiency. CN112611720B proposes a multi-point gas concentration detection device that compensates for dynamic losses. This device includes a signal generator, a voltage adder, a laser emitter, a photoacoustic cell, and a preamplifier circuit. It can eliminate the influence of dynamic losses on optical power fluctuations and improve the measurement accuracy of multi-point gas detection.

[0004] Regarding the structural design of photoacoustic spectroscopy detection systems, CN110095413A introduces a modular photoacoustic cell suitable for laser photoacoustic spectroscopy detection. This photoacoustic cell includes a cell housing with a main resonant cavity, gas inlet and outlet ports, a microphone mounting slot, a sound opening, and light inlet and outlet ports. The overall length of the resonant cavity can be flexibly adjusted according to the measurement environment requirements, improving the photoacoustic signal intensity and the sensitivity of the detection system. CN108226047A proposes a multi-point gas detection system based on a fiber laser's annular cavity. This system includes a pump source, doped fiber, and a photoacoustic cell, enabling multi-point gas measurement and offering advantages such as high power and high signal-to-noise ratio.

[0005] However, existing photoacoustic spectroscopy devices for detecting dissolved gases in oil have some significant shortcomings. First, traditional devices typically rely on vacuum degassing or headspace degassing units, or use oil-gas separation membranes to separate dissolved gases from the oil, which are then introduced into the photoacoustic cell via gas pipes. This approach results in low degassing efficiency, long response time, cumbersome process, poor reliability, and large device size, making it inconvenient for field applications. Second, traditional photoacoustic spectroscopy systems usually use only a single microphone to detect sound wave signals, which limits sensitivity.

[0006] Especially in vibration environments, the detection method using a single microphone is easily affected by vibration noise, impacting detection accuracy. Although CN119595549A proposes a vibration-resistant photoacoustic cell and vibration-optical-photoacoustic spectroscopy gas detection system, which designs a microphone diaphragm positioned between the photoacoustic cell chamber and the microphone's rear chamber, ensuring that the inertial force of the diaphragm itself is opposite to and cancels out the inertial forces of the gases on either side during vibration, thus suppressing noise from external vibrations, this solution is structurally complex and still relies on a single microphone. Its vibration resistance and signal enhancement effects are limited, making it difficult to meet practical application requirements, especially in harsh environments such as substations.

[0007] Therefore, there is an urgent need to develop a gas photoacoustic in-situ detection mechanism with simple structure, fast response, good vibration resistance, and high detection sensitivity to meet the actual needs of power systems and other fields for the detection of dissolved gases in oil. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of the above-mentioned background technology and provide a vibration-enhancing and sensitizing gas photoacoustic in-situ detection mechanism, detection system and method that is small in size, has a short response time, high detection reliability, can realize in-situ detection, can suppress external vibration noise while improving detection sensitivity, and is suitable for the vibration environment of substation sites.

[0009] To achieve this objective, the vibration-damping and sensitizing gas photoacoustic in-situ detection mechanism designed in this invention includes an excitation light source and collimation assembly, a photoacoustic cell, and a signal processing unit. The laser emitted by the excitation light source and collimation assembly is arranged along the central axis of the photoacoustic cell. Multiple sets of microphones are arranged on the central cross-section of the photoacoustic cell. Each set of microphones includes two microphones symmetrically arranged on the left and right sides or the top and bottom sides of the central cross-section of the photoacoustic cell. Each microphone is electrically connected to the signal processing unit. The central cross-section of the photoacoustic cell is a cross-section located in the middle of the photoacoustic cell and perpendicular to the axial direction of the photoacoustic cell.

[0010] Furthermore, the excitation light source and collimation assembly include a laser driver, a laser, and a collimator.

[0011] Furthermore, the photoacoustic cell includes a resonant cavity and a buffer cavity coaxially connected to the left and right ends of the resonant cavity.

[0012] Furthermore, the multiple sets of microphones include a first microphone group and a second microphone group. The first microphone group includes a first microphone and a second microphone symmetrically arranged on the upper and lower sides of the central cross-section of the photoacoustic cell. The second microphone group includes a third microphone and a fourth microphone symmetrically arranged on the left and right sides of the central cross-section of the photoacoustic cell.

[0013] Furthermore, the centers of the first microphone, the second microphone, the third microphone, and the fourth microphone are all located on the same circle coaxial with the photoacoustic cell.

[0014] Furthermore, the first microphone, the third microphone, the second microphone, and the fourth microphone are arranged at 90° intervals along the circumference of the circle.

[0015] Furthermore, the present invention provides a detection system with a vibration-resistant and sensitizing gas photoacoustic in-situ detection mechanism, which includes a detection oil path, a gas inlet at one end of the photoacoustic cell, an oil-gas separation membrane fixedly disposed between the oil in the detection oil path and the gas inlet, and a lens fixedly disposed at the laser inlet at the end of the photoacoustic cell away from the detection oil path.

[0016] Furthermore, the oil-gas separation membrane is fixedly installed outside the buffer cavity near one end of the photoacoustic cell close to the detection oil circuit. The buffer cavity is located at the standing wave node, so this design will not damage the standing wave in the photoacoustic cell.

[0017] Furthermore, the present invention provides a detection method based on a detection system with an anti-vibration and sensitizing gas photoacoustic in-situ detection mechanism, comprising the following steps: the excitation light source and collimation component emit laser light; the signal processing unit collects and processes the signals of the multiple sets of microphones; and the concentration of dissolved gas in the detection oil circuit is obtained according to the corresponding matching relationship between the signal processing results of the signal processing unit and the gas concentration.

[0018] Furthermore, the method by which the signal processing unit acquires and processes the signals of the multiple sets of microphones includes: subtracting the photoacoustic signals acquired by two microphones in the same set to obtain the total signal of a single set of microphones, and adding the total signals of multiple single sets of microphones to obtain the total signal of multiple sets of microphones.

[0019] The beneficial effects of this invention are:

[0020] I. Achieve in-situ detection, optimize detection process and reliability

[0021] This invention eliminates the need for vacuum degassing / headspace degassing units and gas pipes required by traditional detection devices by directly setting an oil-gas separation membrane between the gas inlet of the photoacoustic cell and the detection oil circuit. This allows the detection mechanism to be directly connected to the oil in the oil circuit, eliminating the need for oil sampling or transfer. This not only simplifies the detection structure and reduces the size of the device, but also avoids efficiency loss and sample contamination during the degassing process, significantly shortens the response time, and does not damage the detection oil circuit itself, thus significantly improving detection reliability and ease of operation.

[0022] II. Multiple symmetrical microphone design, balancing vibration reduction and noise reduction with enhanced sensitivity.

[0023] Multiple sets of symmetrical microphones (such as vertically symmetrical first and second microphones, and horizontally symmetrical third and fourth microphones) are set in the central section of the photoacoustic cell (the middle section perpendicular to the axial direction). The centers of each set of microphones are located on the coaxial circle of the photoacoustic cell and arranged circumferentially. By using the processing method of "subtracting signals from the same group and adding signals from multiple groups", the interference of external vibration noise on a single microphone can be canceled (the subtraction process suppresses common-mode noise), and multiple sets of effective photoacoustic signals can be superimposed, which improves the detection sensitivity several times. This solves the pain points of "limited sensitivity and poor vibration resistance" of traditional single microphone systems and is suitable for the harsh vibration environment of substation sites.

[0024] III. Adaptation of photoacoustic cell structure to standing wave characteristics to ensure detection stability

[0025] The photoacoustic cell adopts a structure of "resonant cavity + coaxial buffer cavities at both ends", with the chamber near the oil detection path located at the standing wave node. Based on previous technical principles, the vibration amplitude is minimal at the node. This design avoids interference from the oil-gas separation film with the standing wave morphology within the photoacoustic cavity, ensuring stable acoustic wave superposition and further guaranteeing the accuracy of photoacoustic signal detection. At the same time, the buffer cavity reduces the impact of airflow disturbance on detection, improving the long-term operational stability of the system.

[0026] IV. High system integration and wide applicability.

[0027] The excitation light source and collimation components (including laser driver, laser, and collimator) are integrated with the photoacoustic cell and signal processing unit. The laser is incident along the central axis of the photoacoustic cell, ensuring coaxiality between the light beam and the cell and reducing light energy loss. A lens is fixed at the laser entrance of the photoacoustic cell, protecting the internal structure while ensuring light transmission. The entire system requires no additional auxiliary equipment and can be directly connected to the transformer oil bypass. In addition to the detection of dissolved gases in transformer oil, it can be extended to other scenarios requiring in-situ, highly sensitive gas detection, demonstrating strong practicality and compatibility.

[0028] In summary, this invention, through differential and superposition signal processing technology using multiple microphones, effectively eliminates the interference of external vibrations on the detection results, improving the accuracy and sensitivity of gas concentration detection. Simultaneously, the use of an oil-gas separation membrane enables in-situ detection of dissolved gases in the oil path, eliminating the need for complex gas extraction devices, simplifying the detection process, and improving detection efficiency. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments disclosed in this invention, the accompanying drawings of the embodiments will be briefly described below. These drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention.

[0030] Figure 1 This is a schematic diagram of the structure of the vibration-damping and sensitizing gas photoacoustic in-situ detection mechanism designed in this invention;

[0031] Figure 2 This is a schematic diagram of the structure in which the microphone is arranged in the photoacoustic cell in this invention;

[0032] Figure 3 This is a front view schematic diagram of the structure in this invention in which the microphone is arranged in the photoacoustic cell;

[0033] Figure 4 This is a right-side schematic diagram of the structure in which the microphone is arranged in the photoacoustic cell in this invention;

[0034] Figure 5 This is a schematic diagram of the detection system with an anti-vibration and sensitizing gas photoacoustic in-situ detection mechanism designed according to the present invention;

[0035] Figure 6 This is a schematic diagram of the motion of the first microphone group under external vibration in this invention;

[0036] Figure 7 This is a schematic diagram of the motion of the first microphone group under laser excitation in this invention;

[0037] Among them, 1—laser driver, 2—laser, 3—collimator, 4—photoacoustic cell (4.1—resonant cavity, 4.2—buffer cavity), 5—signal processing unit, 6—first microphone, 7—second microphone, 8—third microphone, 9—fourth microphone, 10—detection oil circuit, 11—oil-gas separation membrane, 12—lens, 13—flange. Detailed Implementation

[0038] The technical solutions (including preferred technical solutions) of the present invention will be further described in detail below with reference to the accompanying drawings and by way of listing some optional embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0039] Example 1

[0040] like Figure 1 As shown, the present invention provides a specific embodiment of an anti-vibration and sensitizing gas photoacoustic detection mechanism:

[0041] The detection mechanism includes an excitation light source and collimation assembly, a photoacoustic cell 4, and a signal processing unit 5. The excitation light source and collimation assembly includes a laser driver 1, a laser 2, and a collimator 3. The laser emitted by the excitation light source and collimation assembly is arranged along the central axis of the photoacoustic cell 4 to ensure that the laser can effectively pass through the photoacoustic cell for gas detection.

[0042] like Figure 2 and Figure 3 As shown, the photoacoustic cell 4 includes a resonant cavity 4.1 and buffer cavities 4.2 coaxially connected to the left and right ends of the resonant cavity 4.1. The resonant cavity 4.1 serves as the main area for generating photoacoustic signals, and its design effectively enhances the photoacoustic effect and improves detection sensitivity. The buffer cavities 4.2 are located at both ends of the resonant cavity to reduce interference from the external environment on the photoacoustic signals within the resonant cavity, and also serve as the incident and exit channels for the laser.

[0043] Multiple microphones are installed on the central cross-section of the photoacoustic cell 4. Here, the central cross-section refers to the section located in the middle of the photoacoustic cell 4, perpendicular to its axial direction. For example... Figure 4 As shown, the multiple sets of microphones include a first microphone group and a second microphone group. The first microphone group includes a first microphone 6 and a second microphone 7 symmetrically arranged on the upper and lower sides of the central cross-section of the photoacoustic cell 4. The second microphone group includes a third microphone 8 and a fourth microphone 9 symmetrically arranged on the left and right sides of the central cross-section of the photoacoustic cell 4.

[0044] The centers of the first microphone 6, the second microphone 7, the third microphone 8, and the fourth microphone 9 are all located on the same circle coaxial with the photoacoustic cell 4, forming a ring-shaped distribution around the central axis of the photoacoustic cell. The first microphone 6, the third microphone 8, the second microphone 7, and the fourth microphone 9 are arranged at 90° intervals along the circumference of the circle, as shown below. Figure 4 As shown, this arrangement enables omnidirectional vibration signal acquisition, improving the system's vibration resistance.

[0045] Each microphone is electrically connected to the signal processing unit 5, which converts the acquired acoustic signals into electrical signals and transmits them to the signal processing unit for processing. The signal processing unit 5 receives signals from each microphone and achieves vibration damping and sensitivity enhancement effects through specific signal processing algorithms.

[0046] like Figure 6 and Figure 7 As shown, the signal processing method among the same group of microphones can effectively eliminate the interference of external vibrations on the detection results. Figure 6The diagram illustrates signal processing when the first microphone 6 and the second microphone 7 vibrate vertically. When external vibration propagates vertically, the symmetrically arranged first microphone 6 and second microphone 7 receive vibration signals with opposite phases. The signal processing unit 5 superimposes these two signals, effectively eliminating vertical vibration interference. Similarly, as... Figure 7 As shown, when external vibrations propagate in the horizontal direction, the vibration signals received by the third microphone 8 and the fourth microphone 9 will cancel each other out during signal processing due to the phase difference, thereby achieving the anti-vibration function in the horizontal direction.

[0047] In actual operation, laser driver 1 controls laser 2 to emit laser light of a specific wavelength. After being collimated by collimator 3, the laser light passes through resonant cavity 4.1 along the central axis of photoacoustic cell 4. When the gas molecules being measured absorb the modulated laser energy, they undergo periodic thermal expansion and contraction, forming sound waves. These sound waves are received by multiple sets of microphones arranged on the central cross-section of the photoacoustic cell. Due to the special arrangement of the microphones, the system can effectively distinguish between gas photoacoustic signals and external vibration interference. Through algorithm processing by signal processing unit 5, high-sensitivity and high anti-interference gas detection is achieved.

[0048] This vibration-resistant and sensitizing gas photoacoustic detection mechanism, through the symmetrical arrangement of multiple microphones and differential signal processing, can effectively suppress the interference of external vibrations on the detection results while maintaining high detection sensitivity, making it suitable for gas concentration detection applications in various complex environments.

[0049] Example 2

[0050] like Figure 5 As shown, the present invention provides a specific embodiment of a detection system with an anti-vibration and sensitizing gas photoacoustic in-situ detection mechanism:

[0051] It includes a laser driver 1, a laser 2, a collimator 3, a photoacoustic cell 4, a signal processing unit 5, a detection oil path 10, an oil-gas separation membrane 11, and a lens 12. The detection oil path 10 is used to introduce the gas to be detected into the photoacoustic cell 4. The oil-gas separation membrane 11 can effectively separate the oil-gas mixture to ensure the purity of the gas entering the photoacoustic cell, while the lens 12 is used to protect the optical system and ensure that the laser can pass through the photoacoustic cell normally.

[0052] Specifically, such as Figure 5 As shown, a gas inlet is provided at one end of the photoacoustic cell 4, and an oil-gas separation membrane 11 is fixedly installed between the oil in the detection oil path 10 and the gas inlet. A lens 12 is fixed at the laser inlet at the end of the photoacoustic cell 4 away from the detection oil path 10. The lens 12 is a high-transmittance lens.

[0053] The oil-gas separation membrane 11 is fixedly installed on the outside of the buffer cavity of the photoacoustic cell 4 near the end of the detection oil circuit 10. The buffer cavity is located at the standing wave node, so this design will not damage the standing wave in the photoacoustic cell.

[0054] like Figure 2 As shown, the photoacoustic cell 4 includes a resonant cavity 4.1 and a buffer cavity 4.2. The resonant cavity 4.1 is used to form acoustic resonance and enhance the photoacoustic signal; the buffer cavity 4.2 is used to reduce external acoustic interference and improve signal stability.

[0055] like Figure 3 and Figure 4 As shown, the photoacoustic cell 4 is equipped with a first microphone 6, a second microphone 7, a third microphone 8, and a fourth microphone 9. These microphones are arranged in a circle around the central axis of the photoacoustic cell to collect photoacoustic signals. The special arrangement of the first microphone 6, the second microphone 7, the third microphone 8, and the fourth microphone 9 can effectively capture sound wave signals from different directions, improving the comprehensiveness and accuracy of the detection.

[0056] like Figure 6 and Figure 7 As shown, the present invention employs a signal processing method for the same group of microphones. Figure 6 The diagram shows the vibration signal processing of the first microphone 6 and the second microphone 7 in the vertical direction. Figure 7 The diagram illustrates the signal processing of the first microphone 6 and the second microphone 7 during horizontal vibration. This signal processing method can effectively eliminate external vibration interference and improve the signal-to-noise ratio.

[0057] In actual operation, dissolved gases in the oil in the detection oil circuit 10 are separated by the oil-gas separation membrane 11 and enter the gas inlet of the photoacoustic cell 4. The laser generated by the laser driver 1 passes through the laser 2 and collimator 3, and then enters the resonant cavity 4.1 of the photoacoustic cell 4 through the lens 12. The laser interacts with gas molecules to produce a photoacoustic effect, generating acoustic signals. These acoustic signals are collected by microphones arranged in the photoacoustic cell 4 and transmitted to the signal processing unit 5 for processing and analysis.

[0058] The oil-gas separation membrane 11 enables the gas in the oil to be efficiently separated and enter the photoacoustic cell 4, while the lens 12 protects the inside of the photoacoustic cell from external contamination and ensures that the laser can be efficiently transmitted into the photoacoustic cell.

[0059] This detection system has a reasonable structural design, with all components working together to achieve highly sensitive and vibration-resistant in-situ detection of dissolved gases in oil, meeting the detection needs of complex industrial environments.

[0060] Example 3

[0061] Based on Example 2, the present invention provides a specific embodiment of a gas concentration detection method:

[0062] Reference Figures 1 to 7 accomplish.

[0063] The detection method includes the following steps:

[0064] Step 1: Excite the light source and collimation component to emit laser light.

[0065] Specifically, such as Figure 1 As shown, laser 2 emits laser light under the control of laser driver 1. The laser light is collimated by collimator 3 and then irradiates the photoacoustic cell 4. The collimated laser beam has good parallelism and can effectively pass through the resonant cavity 4.1 of the photoacoustic cell 4, ensuring that the laser energy is fully absorbed by the gas to be measured.

[0066] Step 2: The signal processing unit acquires and processes signals from multiple microphones.

[0067] Reference Figure 2 , Figure 3 and Figure 4 As shown, the photoacoustic pool 4 is equipped with multiple sets of microphones, including a first microphone 6, a second microphone 7, a third microphone 8, and a fourth microphone 9. These microphones are distributed in a circle around the central axis of the photoacoustic pool, as shown in the diagram. Figure 4 As shown. Signal processing unit 5 is connected to each microphone and collects the photoacoustic signals detected by them.

[0068] Signal processing methods include:

[0069] The total signal of a single microphone group is obtained by subtracting the photoacoustic signals collected by the two microphones in the same group.

[0070] like Figure 6 and Figure 7 As shown, for vertical and horizontal vibrations, subtracting the signals collected by the first microphone 6 and the second microphone 7 can eliminate external vibration interference and simultaneously double the photoacoustic signal. Similarly, the signals from the third microphone 8 and the fourth microphone 9 are also subtracted. The total signals from multiple individual microphones in the two sets of microphones are then added together to obtain the total signal from multiple microphones. Specifically:

[0071] When vibration noise is present, the microphone exhibits upward and downward accelerations. Taking the presence of downward acceleration 'a' as an example, ... Figure 6 As shown, due to inertia, both the first microphone 6 and the second microphone 7 will move upwards. At this time, the signals of the two microphones are the same, both being N. When the gas in the photoacoustic cell 4 generates a photoacoustic signal, the first microphone 6 will move upwards, and the second microphone 7 will move downwards. At this time, the photoacoustic signals measured by the two microphones are S and -S, respectively, and the total signals of the two microphones are as follows:

[0072] V1=S+N

[0073] V2=-S+N

[0074] Subtract the total signals from the two microphones, that is:

[0075] V 12 =2S

[0076] This means the photoacoustic signal is doubled while vibration noise is suppressed. Similarly, subtracting the total signal from the third microphone 8 and the fourth microphone 9 will also yield V. 34 =2S, and finally add V12 and V34 together to get V. 1234 =4S, which means that external vibration noise is suppressed and the detection sensitivity is increased by four times.

[0077] The total signal from the first set of microphones (first microphone 6 and second microphone 7) is added to the total signal from the second set of microphones (third microphone 8 and fourth microphone 9) to obtain the final total signal from all microphones. This signal processing method can further improve the signal-to-noise ratio and enhance detection sensitivity.

[0078] Step 3: Based on the matching relationship between the signal processing results of the signal processing unit and the gas concentration, the concentration of dissolved gas in the detection oil circuit is obtained.

[0079] like Figure 5 As shown, the oil in the detection oil circuit 10 passes through the oil-gas separation membrane 11, causing dissolved gas to precipitate and enter the resonant cavity 4.1 of the photoacoustic cell 4. When a laser beam passes through the lens 12 and irradiates the gas in the resonant cavity 4.1, the gas molecules absorb the modulated laser energy and undergo periodic thermal expansion, forming sound waves that are detected by the microphone. The signal processing unit 5 calculates the actual concentration of dissolved gas in the detection oil circuit based on the processed photoacoustic signal intensity and compares it with a pre-established calibration curve of signal intensity versus gas concentration.

[0080] This detection method effectively eliminates the interference of external vibrations on the detection results by using differential and superimposed signal processing technology with multiple microphones, thereby improving the accuracy and sensitivity of gas concentration detection. Simultaneously, the use of an oil-gas separation membrane enables in-situ detection of dissolved gases in the oil circuit, eliminating the need for complex gas extraction devices, simplifying the detection process, and improving detection efficiency.

[0081] It should be noted that the above description of the technical solutions is exemplary, and this specification may be embodied in different forms and should not be construed as limiting it to the technical solutions set forth herein. Rather, providing these descriptions will ensure that the disclosure of this invention is thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Furthermore, the technical solutions of this invention are defined only by the scope of the claims.

[0082] The shapes, dimensions, ratios, angles, and figures disclosed in the description of various aspects of this specification and claims are merely examples, and therefore, this specification and claims are not limited to the details shown. In the following description, detailed descriptions of relevant known functions or configurations will be omitted where it is determined that such descriptions would unnecessarily obscure the focus of this specification and claims. Where the terms “comprising,” “having,” and “including” are used as described in this specification, there may also be another part or other components, and the terms used are generally singular but may also be plural. It should be noted that although various different components may appear and be described in this specification using terms such as “first,” “second,” “top,” “bottom,” “side,” “other side,” “one end,” “other end,” etc., these components and parts should not be limited by these terms. These terms are used only to distinguish one component and part from another. For example, without departing from the scope of this specification, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component; top and bottom components may, in certain cases, be interchanged or converted; components at one end and at the other end may have the same or different properties.

[0083] Finally, it should be noted that the above embodiments are merely representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments and many variations are possible. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention should be considered within the protection scope of the present invention.

Claims

1. A vibration-resistant and sensitizing gas photoacoustic in-situ detection mechanism, characterized in that: It includes an excitation light source and collimation assembly, a photoacoustic cell (4) and a signal processing unit (5). The laser emitted by the excitation light source and collimation assembly is arranged along the central axis of the photoacoustic cell (4). Multiple sets of microphones are arranged on the central cross section of the photoacoustic cell (4). Each set of microphones includes two microphones symmetrically arranged on the left and right sides or the top and bottom sides of the central cross section of the photoacoustic cell (4). The signal processing unit (5) receives the signal from each microphone and processes the signal. The central cross section of the photoacoustic cell (4) is a cross section located in the middle of the photoacoustic cell (4) and perpendicular to the axial direction of the photoacoustic cell (4).

2. The anti-vibration and sensitizing gas photoacoustic in-situ detection mechanism as described in claim 1, characterized in that: The excitation light source and collimation assembly include a laser driver (1), a laser (2), and a collimator (3).

3. The anti-vibration and sensitizing gas photoacoustic in-situ detection mechanism as described in claim 1, characterized in that: The photoacoustic cell (4) includes a resonant cavity (4.1) and a buffer cavity (4.2) coaxially connected to the left and right ends of the resonant cavity (4.1).

4. The anti-vibration and sensitizing gas photoacoustic in-situ detection mechanism as described in claim 1, characterized in that: The multiple sets of microphones include a first microphone group and a second microphone group. The first microphone group includes a first microphone (6) and a second microphone (7) symmetrically arranged on the upper and lower sides of the central section of the photoacoustic pool (4). The second microphone group includes a third microphone (8) and a fourth microphone (9) symmetrically arranged on the left and right sides of the central section of the photoacoustic pool (4).

5. The anti-vibration and sensitizing gas photoacoustic in-situ detection mechanism as described in claim 4, characterized in that: The centers of the first microphone (6), the second microphone (7), the third microphone (8), and the fourth microphone (9) are all located on the same circle coaxial with the photoacoustic cell (4).

6. The anti-vibration and sensitizing gas photoacoustic in-situ detection mechanism as described in claim 5, characterized in that: The first microphone (6), the third microphone (8), the second microphone (7) and the fourth microphone (9) are arranged at 90° intervals along the circumference of the circle.

7. A detection system having the anti-vibration and sensitizing gas photoacoustic in-situ detection mechanism according to any one of claims 1-6, characterized in that: It includes a detection oil path (10), a gas inlet is provided at one end of the photoacoustic cell (4), an oil-gas separation membrane (11) is fixedly provided between the oil in the detection oil path (10) and the gas inlet, and a lens (12) is fixed at the laser inlet at the end of the photoacoustic cell (4) away from the detection oil path (10).

8. The detection system with an anti-vibration and sensitizing gas photoacoustic in-situ detection mechanism as described in claim 7, characterized in that: The oil-gas separation membrane (11) is fixedly installed on the outside of the buffer cavity (4.2) of the photoacoustic cell (4) near the end of the detection oil circuit (10), and the buffer cavity (4.2) is located at the standing wave node.

9. A detection method based on the detection system with an anti-vibration and sensitizing gas photoacoustic in-situ detection mechanism as described in claim 7 or 8, characterized in that: It includes the following steps: The excitation light source and collimation component emit laser light, and the signal processing unit (5) collects and processes the signals of the multiple microphones. Based on the signal processing result of the signal processing unit (5) and the corresponding matching relationship with the gas concentration, the concentration of dissolved gas in the detection oil circuit (10) is obtained.

10. The detection method based on the detection system with an anti-vibration and sensitizing gas photoacoustic in-situ detection mechanism as described in claim 9, characterized in that: The method for the signal processing unit (5) to collect and process the signals of the multiple sets of microphones includes: subtracting the photoacoustic signals collected by two microphones in the same set to obtain the total signal of a single set of microphones, and adding the total signals of multiple single sets of microphones of multiple sets of microphones to obtain the total signal of multiple sets of microphones.

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