An aircraft oil and gas line detection device

Abstract

The application belongs to the technical field of pipeline detection, and particularly relates to an aircraft oil and gas pipeline detection device. The device comprises a detection head and a host computer. The detection head is used for switching to a first detection state or a second detection state in response to the operation of a user, and detecting a target oil and gas pipeline in the first detection state or the second detection state. In the first detection state, the detection head sends ultrasonic waves to the target oil and gas pipeline and collects echo information. In the second detection state, the detection head collects vibration information of the target oil and gas pipeline. The detection head is used for collecting an image of a target area of the target oil and gas pipeline in response to a trigger signal of the host computer. The host computer is used for obtaining collected data of the detection head in the first detection state or the second detection state, and determining whether the target oil and gas pipeline has a preset fault based on the collected data and a preset judgment condition. When it is determined that the target oil and gas pipeline has the preset fault, a trigger signal is generated to trigger the detection head to collect the image of the target area of the target oil and gas pipeline.

Description

Technical Field

[0001] This invention belongs to the field of pipeline testing technology, specifically relating to an aircraft oil and gas pipeline testing device. Background Technology

[0002] An aircraft is a complex and massive system, primarily structured, encompassing various systems based on different principles, such as the hydraulic system, landing gear system, fuel system, communication system, and engine system. Each system performs its function during flight to ensure safe operation. Minor gas leaks may occur in components, pipes, and joints within the aircraft cabin and equipment bays. Oil cross-contamination in the aircraft's hydraulic system components can lead to system malfunctions. Oil cross-contamination leaks generate vibration and sound signals, while gas leaks generate ultrasonic signals.

[0003] Theoretically, there are various methods for fault analysis and localization, such as fault tree analysis, event tree analysis, and logic chain analysis. By conducting theoretical analysis on typical fault scenarios and selecting different analysis methods, the causes and solutions to the faults can be identified. This can help maintenance personnel carry out effective and timely maintenance work on the system. However, in general, oil or air leakage between two systems is minimal and will not cause faults. Theoretical fault analysis cannot detect or locate problems in advance.

[0004] In view of this, in order to solve the above problems, the present invention designs an aircraft oil and gas pipeline detection device. Summary of the Invention

[0005] Purpose of the invention: The purpose of this invention is to address the shortcomings of current technology by providing an aircraft oil and gas pipeline testing device.

[0006] Technical solution: To achieve the above objectives, the present invention provides an aircraft oil and gas pipeline inspection device, including an inspection head and a main unit; The detection head is used to switch to a first detection state or a second detection state in response to user operation, and to detect the target oil and gas pipeline in either the first or second detection state; wherein, in the first detection state, the detection head emits ultrasonic waves to the target oil and gas pipeline and collects echo information; in the second detection state, the detection head collects vibration information of the target oil and gas pipeline; The detection head is also used to acquire images of the target area of ​​the target oil and gas pipeline in response to the trigger signal of the host. The host is used to acquire the data collected by the detection head in the first detection state or the second detection state, and to determine whether the target oil and gas pipeline has a preset fault based on the acquired data and preset judgment conditions; and, when it is determined that the target oil and gas pipeline has the preset fault, to generate the trigger signal to trigger the detection head to acquire an image of the target area of ​​the target oil and gas pipeline.

[0007] Furthermore, the detection head includes a vibration sensor and an ultrasonic sensor; the ultrasonic sensor is activated in the first detection state, emitting ultrasonic waves to the target oil and gas pipeline and collecting echo information; the vibration sensor is activated in the second detection state, and collecting vibration information of the target oil and gas pipeline.

[0008] 3. The aircraft oil and gas pipeline detection device according to claim 1, characterized in that: the main unit includes a display, a three-stage filtering and amplification module, a signal conditioning module, and a digital-to-analog conversion processing and transmission module; In the first detection state, the three-stage filtering and amplification module is used to filter and amplify the echo information detected by the detection head to obtain an ultrasonic analog signal; the digital-to-analog conversion processing and transmission module is used to convert the ultrasonic analog signal into a digital signal and transmit the digital signal to the display for display. In the second detection state, the signal conditioning module is used to filter the vibration information collected by the detection head to obtain a vibration simulation signal; the three-stage filtering and amplification module is used to amplify the vibration simulation signal and transmit the amplified vibration simulation signal to the digital-to-analog conversion processing and transmission module; the digital-to-analog conversion processing and transmission module converts the amplified vibration simulation signal into a digital signal and transmits the digital signal to the display for display.

[0009] Furthermore, the three-stage filtering and amplification module includes a first filter, a second filter, and a third filter cascaded in sequence, with an amplification circuit provided between adjacent filters.

[0010] Furthermore, the signal conditioning module includes an active bandpass filter and an ultra-precision low-noise operational amplifier connected to the active bandpass filter.

[0011] Furthermore, the signal conditioning module and the digital-to-analog conversion processing and transmission module include an analog-to-digital converter, an FPGA connected to the analog-to-digital converter, and the FPGA connected to the host via a serial port.

[0012] Furthermore, the host also includes a spectrum shifting module, which is connected to the three-stage filtering and amplification module. An earphone is connected to the spectrum shifting module, which is used to down-convert the extracted fault analog signal to obtain a fault sound suitable for human hearing.

[0013] Furthermore, a handle is fixedly installed on the outside of the host unit.

[0014] Furthermore, the host unit adopts a metal casing, and a rubber mold is fitted around the outside of the host unit.

[0015] Furthermore, the detection head is equipped with LED lights and a camera.

[0016] Beneficial effects: 1. This invention analyzes data detected by ultrasonic and vibration sensors. The analyzed data can determine whether the aircraft has experienced gas leaks or oil spills, allowing for early repairs and preventing gas leaks and oil spills from affecting the aircraft, thus reducing the aircraft's failure rate.

[0017] 2. This invention detects gas leaks by detecting ultrasonic signals and detects oil leakage by detecting vibration signals. Moreover, the detection personnel only need to follow the gas or oil path and judge the signal strength to complete the detection of gas leaks or oil leakage. The detection process is simple and greatly improves the detection efficiency.

[0018] 3. This invention has high detection efficiency and greatly simplifies the detection steps, thereby saving the cost of aircraft maintenance personnel and detection equipment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a system framework diagram of the present invention; Figure 3 The sound intensity versus frequency curve of this invention; Figure 4 The non-inverting amplifier circuit diagram of this invention; Figure 5 Schematic diagram of the three-stage filtering and amplification module of this invention; Figure 6 Schematic diagram of the spectrum shifting circuit of this invention; Figure 7 This is a diagram of the internal structure of the detection head of the present invention; Figure 8 FPGA logic functional block diagram of this invention; Figure 9 Schematic diagram of the alarm device. Detailed Implementation

[0020] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, and the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0021] according to Figures 1-9 Further explanation is needed.

[0022] This invention provides an aircraft oil and gas pipeline inspection device (hereinafter referred to as the inspection device), comprising an inspection head and a main unit; The detection head is used to respond to user operations, switch to a first detection state or a second detection state, and detect the target oil and gas pipeline in either the first or second detection state. In the first detection state, the detection head emits ultrasonic waves to the target oil and gas pipeline and collects echo information. In the second detection state, the detection head collects vibration information of the target oil and gas pipeline. The detection head is also used to acquire images of the target area of ​​the target oil and gas pipeline in response to the trigger signal of the host computer; The host is used to acquire the data collected by the detection head in the first detection state or the second detection state, and to determine whether there is a preset fault in the target oil and gas pipeline based on the acquired data and preset judgment conditions; and when it is determined that there is a preset fault in the target oil and gas pipeline, a trigger signal is generated to trigger the detection head to acquire an image of the target area of ​​the target oil and gas pipeline.

[0023] Specifically, the aforementioned target oil and gas pipeline is the oil and gas pipeline to be tested within a testing environment. This testing environment refers to a state where the oil and gas pipeline to be tested is easily detectable for gas leaks and oil cross-contamination. In one possible implementation, high-pressure gas can be introduced into the oil and gas pipeline to be tested, making the internal pressure of the gas pipeline greater than the external pressure, thereby placing the oil and gas pipeline to be tested within the aforementioned testing environment. It should be noted that in this embodiment, different methods can be adaptively selected to construct the testing environment according to the specific circumstances of the oil and gas pipeline to be tested; this embodiment does not impose any limitations on this.

[0024] The aforementioned first detection state refers to the state of the detection device in a scenario where gas leaks in a target oil and gas pipeline are detected. In this first detection state, ultrasonic waves can be used to detect whether a gas leak exists in the target oil and gas pipeline. If there is no gas leak in the target oil and gas pipeline, the ultrasonic echo signal should have a stable overall waveform. However, if there is a gas leak in the target oil and gas pipeline, a strong echo will appear at the leak location. Utilizing this characteristic, the host can determine whether a gas leak exists in the target oil and gas pipeline based on the data collected by the detection head and preset judgment conditions, thereby achieving coarse location of the gas leak. When a gas leak is determined to exist, the host can trigger the detection head to acquire images of the coarsely located target area, thereby obtaining specific image data of the target area where the gas leak is located. Detection personnel can then accurately locate the gas leak based on this specific image data.

[0025] The aforementioned second detection state refers to the state of the detection device in a scenario where oil leakage is detected in a target oil and gas pipeline. In this second detection state, the presence of oil leakage in the target oil and gas pipeline can be detected by collecting vibration information. If there is no oil leakage, the vibration information should have a stable overall waveform. If there is oil leakage, a strong echo will appear at the leakage location. Utilizing this characteristic, the host computer can determine whether oil leakage exists in the target oil and gas pipeline based on the data collected by the detection head and preset judgment conditions, thereby achieving coarse positioning of the leakage location. When oil leakage is confirmed, the host computer can trigger the detection head to acquire images of the coarsely positioned target area, thereby obtaining specific image data of the target area where the leakage location is located. Detection personnel can then accurately locate the leakage location based on the specific image data.

[0026] It should be noted that the above-mentioned method of accurately locating the gas leak or oil spill location based on specific image data can be adapted by the testing personnel according to the testing needs. For example, manual observation or fault detection based on machine learning can be used. This embodiment does not limit this.

[0027] In one specific embodiment of the present invention, the detection head includes a vibration sensor and an ultrasonic sensor; the ultrasonic sensor is activated in the first detection state, emitting ultrasonic waves to the target oil and gas pipeline and collecting echo information; the vibration sensor is activated in the second detection state, collecting vibration information of the target oil and gas pipeline. A camera is installed inside the detection head.

[0028] The host includes a display, a three-stage filtering and amplification module, a signal conditioning module, and a digital-to-analog conversion and transmission module; In the first detection state, the three-stage filtering and amplification module is used to filter and amplify the echo information detected by the detection head to obtain an ultrasonic analog signal; the digital-to-analog conversion processing and transmission module is used to convert the ultrasonic analog signal into a digital signal and transmit the digital signal to the display for display. In the second detection state, the signal conditioning module is used to filter the vibration information collected by the detection head to obtain a vibration simulation signal; the three-stage filtering and amplification module is used to amplify the vibration simulation signal and transmit the amplified vibration simulation signal to the digital-to-analog conversion processing and transmission module; the digital-to-analog conversion processing and transmission module converts the amplified vibration simulation signal into a digital signal and transmits the digital signal to the display for display.

[0029] In the first detection state, the location of the gas leak is detected. High-pressure gas is introduced into the gas pipeline to make the internal pressure greater than the external pressure. The operator then moves the detection head along the gas pipeline. An ultrasonic sensor fixedly installed inside the detection head detects ultrasonic signals. The detection head transmits the detected ultrasonic signals to the main unit via a cable fixedly connected between the housing and the detection head. A three-stage filtering and amplification module inside the main unit performs three stages of filtering on the ultrasonic signal, ultimately obtaining an ultrasonic analog signal in the frequency range of 40kHz ± 1kHz. Subsequently, the digital-to-analog conversion and transmission module converts the 40kHz signal into an analog signal. The ultrasonic analog signal in the frequency range of kHz ± 1kHz is converted into a digital signal and transmitted to a display. Inspectors determine the presence of a gas leak near the detection head based on the strength of the displayed digital signal. A strong signal indicates a leak, and the inspector moves the detection head within the area to capture video footage. The images and videos are then transmitted to the host computer's memory for storage. Inspectors can then use these stored images and videos to locate the leak. If the digital signal is weak, no leak is detected, and the inspector can continue moving the detection head along the gas pipeline to search for the leak.

[0030] In the second detection phase, the location of the oil leak needs to be detected. High-pressure gas is introduced into the liquid pipeline to make the internal pressure greater than the external pressure. The vibration sensor is then fixed to a suction cup, which is attached to the liquid pipeline. The vibration sensor converts the vibration pressure generated by the vibration signal into an analog vibration signal, which is transmitted via cable to the signal conditioning module. The signal conditioning module filters the analog vibration signal to obtain a clean 1-2kHz analog vibration signal. This signal is then amplified and transmitted to the digital-to-analog conversion and transmission module. The analog-to-digital conversion and transmission module converts the vibration analog signal into a vibration digital signal. This digital signal is then transmitted to a display for viewing. Inspectors determine the presence of gas leaks near the detection head based on the strength of the displayed digital signal. A strong signal indicates oil leakage. Inspectors then move the detection head in the area, and a camera inside the head captures and records images and videos. These images and videos are transmitted via cable to the host computer's memory for storage. Inspectors can then use these stored images and videos to locate the oil leakage point. If the digital signal on the display is weak, no oil leakage point exists. Inspectors can continue moving the detection head along the liquid pipeline to continue searching for the leakage point.

[0031] The reason for choosing a 40kHz ultrasonic analog signal is that the ultrasonic wave generated by a leak has a relatively wide frequency band, generally between 20kHz and 100kHz. The energy of the ultrasonic wave varies at different frequencies. The peak value of the ultrasonic wave generated by a leak also varies with the size of the leak orifice and the pressure. For example, under a certain leak orifice diameter and pressure, if the peak value of the ultrasonic wave is at 38kHz, then increasing the orifice diameter might result in a peak value at 36kHz; if the orifice diameter remains constant, increasing the pressure difference between the inside and outside of the system might result in a peak value at 43kHz. However, at the same frequency, for leak orifices of the same shape, the sound intensity of the ultrasonic wave generated by the leak increases with the increase of the leak volume. Furthermore, if the leak volume is constant, i.e., the leak area is fixed, the closer the shape of the leak orifice is to a circle, the higher the sound pressure. The ultrasonic wave intensity emitted by a small-hole gas leak is extremely weak, and in industrial settings, the environmental noise is considerable. Therefore, to detect the ultrasonic waves emitted by a gas leak in harsh environments, the signal amplification section of the system must be carefully designed. In this system, only the intensity of the leakage ultrasonic wave at 40kHz is detected because experiments have shown that the leakage ultrasonic wave energy is relatively high at 40kHz, and the energy difference between the leakage sound and the background noise is also the largest. This selection can increase the sensitivity of the system.

[0032] In one specific embodiment of the present invention, the three-stage filtering and amplification module includes an unpassive high-pass filter, an amplification circuit connected to the unpassive high-pass filter, an active band-pass filter connected to the amplification circuit, an ultra-precision low-noise operational amplifier connected to the active band-pass filter, a low-pass filter connected to the ultra-precision low-noise operational amplifier, and a non-inverting amplification circuit connected to the low-pass filter.

[0033] The signal conditioning module includes an active bandpass filter and an ultra-precision low-noise operational amplifier connected to the active bandpass filter.

[0034] The signal conditioning module and the digital-to-analog conversion processing and transmission module include an analog-to-digital converter, an FPGA connected to the analog-to-digital converter, and the FPGA connected to the host via a serial port.

[0035] When it is necessary to detect the location of a gas leak, the inspector introduces high-pressure gas into the gas pipeline, making the pressure inside the gas pipeline greater than the pressure outside the gas pipeline. Then, the inspector moves the detection head along the gas pipeline, and the ultrasonic sensor fixedly installed inside the detection head detects the ultrasonic information. The detection head transmits the detected ultrasonic information to the host through the cable fixedly connected between the housing and the detection head. After the ultrasonic information enters the host, it passes through the first-stage passive high-pass filter to filter out noise below 20KHz and above 100KHz, filtering the input ultrasonic analog signal to an ultrasonic analog signal with a frequency range of 20KHz-100KHz. Although this increases the power consumption of the ultrasonic sensor, it can be compensated for by increasing the amplification factor later.

[0036] After receiving the 20kHz-100kHz ultrasonic analog signal that has been filtered and amplified by the first stage, the second stage uses an active bandpass filter to filter out most of the background noise and noise generated by devices or circuits that were not filtered out by the previous passive high-pass filter. Here, the selected passband is 38kHz to 42kHz, resulting in a relatively pure ultrasonic analog signal of 38kHz to 42kHz. The signal is then amplified by an ultra-precise low-noise operational amplifier in the second stage, which has extremely low voltage and current offset and very high gain stability before being output to the third stage.

[0037] The third stage is a non-inverting amplifier circuit. After an ultrasonic analog signal input of 38kHz to 42kHz is passed through a low-pass filter, further filtering the signal to a frequency range of 40kHz ± 1kHz. After energy attenuation through filtering, the signal is amplified by the non-inverting amplifier circuit (a type of electronic amplifier that amplifies the amplitude of signals that are in phase). Non-inverting amplifiers are typically used to amplify analog signals, such as audio or analog video signals. The working principle of a non-inverting amplifier is that it amplifies the amplitude of the input signal by changing the voltage or current in the amplifier's internal circuitry. The gain of the non-inverting amplifier can be adjusted by controlling the voltage or current in its internal circuitry, thereby adjusting the amplitude of the output signal. After the third stage of amplification, the signal range is -3.3V to +3.3V. Passing through two 20kΩ resistors and connected to a +3.3V bias voltage, a sufficiently high-precision leakage ultrasonic analog signal can be obtained. Therefore, a connected comparison circuit and alarm circuit can be used. The comparison circuit has two sets of triggers, with trigger voltages of -3.3V and +3.3V respectively. The output ultrasonic analog signal is fed into the comparison circuit, and the voltage of the ultrasonic analog signal input to the comparison circuit is compared with the two sets of triggers. If the ultrasonic analog signal voltage is between -3.3V and +3.3V, the triggers are activated, causing the comparison circuit and alarm circuit to conduct. The alarm circuit is powered on, and the buzzer in the alarm circuit sounds, indicating that there is a gas leak. If the ultrasonic analog signal voltage is greater than +3.3V or less than -3.3V after comparison with the two sets of triggers, the triggers do not work, the comparison circuit is de-energized, and therefore the alarm circuit has no current, and the buzzer does not work, indicating that there is no gas leak.

[0038] After the ultrasonic analog signal undergoes three stages of filtering and amplification, the three-stage filtering and amplification module transmits the ultrasonic analog signal to the digital-to-analog converter (DAC) processing and transmission module. The DAC converts the ultrasonic analog signal into an ultrasonic digital signal. The converted ultrasonic digital signal is then fed into the FPGA on the board, where it is combined and buffered. Finally, the data is transmitted to the host memory via a USB 2.0 interface. Inspectors can access the ultrasonic digital signal data stored in the host memory. The ultrasonic digital signal data is then displayed on a monitor. The intensity of the ultrasonic digital signal on the monitor indicates whether there is a gas leak. A weak ultrasonic digital signal suggests no gas leak, while a strong signal indicates a gas leak in the vicinity of the detection head. Inspectors can then move the detection head in this area, and a camera installed inside the detection head will capture and record images and videos of the area. These images and videos are transmitted to the host memory via cable for storage. Inspectors can then use these stored images and videos to locate the leak point until it is found.

[0039] When detecting oil leakage, the inspector introduces high-pressure gas into the liquid pipeline, making the internal pressure greater than the external pressure. The vibration sensor is then fixed to a suction cup, which is attached to the liquid pipeline. The vibration sensor converts the vibration signal into a simulated vibration signal, which is transmitted via cable to an active bandpass filter (1-2kHz filter). This primary filter removes most background noise and noise generated by devices or circuits, resulting in a clean 1-2kHz vibration signal. This signal is then amplified by an ultra-precision, low-noise operational amplifier (OPA) with extremely low voltage and current offset and high gain stability. The amplified simulated vibration signal is then transmitted to a digital-to-analog converter for further processing. The principle of the analog-to-digital conversion and transmission module here is the same as that of the analog-to-digital conversion and transmission module mentioned above, so it will not be described in detail. After the analog-to-digital conversion and transmission module, the vibration digital signal is obtained and transmitted to the display for display. The inspector can check the intensity of the vibration digital signal on the display. If the vibration digital signal is weak, it means that there is no oil cross-contamination. If the vibration digital signal is strong, it means that there is oil cross-contamination in the vicinity of the detection head. Subsequently, the inspector moves the detection head in this area, and the camera installed inside the detection head takes pictures and videos of this area. The collected pictures and videos are transmitted to the host's memory for storage via cable. The inspector can open the stored pictures and videos to find the oil cross-contamination point until the oil cross-contamination point is found.

[0040] In one specific embodiment of the present invention, the host also includes a spectrum shifting module, which is connected to a three-stage filtering and amplification module. An earphone is connected to the spectrum shifting module. The spectrum shifting module is used to down-convert the extracted fault analog signal to obtain a fault sound suitable for human hearing.

[0041] The spectrum shifting module can down-frequency the ultrasonic analog signal obtained from the three-stage filtering and amplification module. Specifically, it subtracts a frequency signal from the resulting 40kHz ultrasonic analog signal, making the frequency of the resulting signal fall within the range of 20Hz to 20kHz, which is audible to the human ear. Inspectors can listen to the result signal through headphones, facilitating a clear identification of the gas leak fault signal. This spectrum shifting module is existing technology and will not be elaborated upon further.

[0042] In one specific embodiment of the present invention, the main unit adopts a metal casing, and a rubber mold is fitted on the outside of the main unit.

[0043] By encasing the main unit in a rubber mold, the risk of damage from drops can be reduced, thus improving the main unit's safety.

[0044] In one specific embodiment of the present invention, a handle is fixedly installed on one side of the housing.

[0045] A handle is fixedly installed on one side of the housing, making it easy for operators to pick up and put down the housing.

[0046] In one specific embodiment of the present invention, an LED light is installed inside the detection head.

[0047] By installing LED lights inside the detection head, illumination can be provided during the process of locating gas leaks or oil spills, ensuring that inspectors can clearly see the scene.

[0048] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An aircraft fuel and gas pipeline testing device, characterized in that: Includes the detection head and the main unit; The detection head is used to switch to a first detection state or a second detection state in response to user operation, and to detect the target oil and gas pipeline in either the first or second detection state; wherein, in the first detection state, the detection head emits ultrasonic waves to the target oil and gas pipeline and collects echo information; in the second detection state, the detection head collects vibration information of the target oil and gas pipeline; The detection head is also used to acquire images of the target area of ​​the target oil and gas pipeline in response to the trigger signal of the host. The host is used to acquire the data collected by the detection head in the first detection state or the second detection state, and determine whether the target oil and gas pipeline has a preset fault based on the acquired data and preset judgment conditions; and when it is determined that the target oil and gas pipeline has the preset fault, generate the trigger signal to trigger the detection head to acquire an image of the target area of ​​the target oil and gas pipeline. The detection head includes a vibration sensor and an ultrasonic sensor; the ultrasonic sensor is activated in the first detection state, emitting ultrasonic waves to the target oil and gas pipeline and collecting echo information; the vibration sensor is activated in the second detection state, and collecting vibration information of the target oil and gas pipeline. The host includes a display, a three-stage filtering and amplification module, a signal conditioning module, and a digital-to-analog conversion and transmission module; In the first detection state, the three-stage filtering and amplification module is used to filter and amplify the echo information detected by the detection head to obtain an ultrasonic analog signal; the digital-to-analog conversion processing and transmission module is used to convert the ultrasonic analog signal into a digital signal and transmit the digital signal to the display for display. In the second detection state, the signal conditioning module is used to filter the vibration information collected by the detection head to obtain a vibration simulation signal; the three-stage filtering and amplification module is used to amplify the vibration simulation signal and transmit the amplified vibration simulation signal to the digital-to-analog conversion processing and transmission module; the digital-to-analog conversion processing and transmission module converts the amplified vibration simulation signal into a digital signal and transmits the digital signal to the display for display; The host also includes a spectrum shifting module, which is connected to the three-stage filtering and amplification module. An earphone is connected to the spectrum shifting module. The spectrum shifting module is used to down-convert the extracted fault analog signal to obtain a fault sound suitable for human hearing. Gas leaks can be detected by detecting ultrasonic signals, and oil spills can be detected by detecting vibration signals. The detection personnel only need to follow the gas or oil path and judge the signal strength to complete the detection of gas leaks or oil spills.

2. The aircraft fuel and gas pipeline detection device according to claim 1, characterized in that: The three-stage filtering and amplification module includes a first filter, a second filter, and a third filter cascaded in sequence, with an amplification circuit between adjacent filters.

3. The aircraft fuel and gas pipeline detection device according to claim 1, characterized in that: The signal conditioning module includes an active bandpass filter and an ultra-precision low-noise operational amplifier connected to the active bandpass filter.

4. The aircraft oil and gas pipeline detection device according to claim 1, characterized in that: The signal conditioning module and the digital-to-analog conversion processing and transmission module include an analog-to-digital converter, an FPGA connected to the analog-to-digital converter, and the FPGA connected to the host via a serial port.

5. The aircraft fuel and gas pipeline detection device according to claim 1, characterized in that: The main unit is fixedly equipped with a handle on the outside.

6. The aircraft fuel and gas pipeline detection device according to claim 1, characterized in that: The main unit has a metal casing, and a rubber mold is fitted on the outside of the main unit.

7. The aircraft fuel and gas pipeline detection device according to claim 1, characterized in that: The detection head is equipped with an LED light and a camera.

Images