Underground fluid detection device fusing acoustic signal and laser-induced breakdown spectroscopy technology and detection method

Abstract

The invention discloses an underground fluid detection device integrating acoustic signals and a laser-induced breakdown spectroscopy technology. The underground fluid detection device further comprises a laser spectrum acquisition device, an acoustic signal acquisition device and a fusion signal analysis and correction module, the laser spectrum acquisition device is arranged above the conveying pipeline and comprises a solid laser, a beam expander, a reflector, a focusing lens and an optical fiber probe; the acoustic signal acquisition device is arranged close to one end of a water inlet of the drainage pipeline, and the fusion signal analysis and correction module is connected with the laser spectrum acquisition device and the acoustic signal acquisition device; the fusion signal analysis and correction module comprises a processor, the processor is connected with the oscilloscope, compared with the prior art, the LIBS technology and the acoustic detection technology are fused, the characteristics of the underground fluid can be known more comprehensively, and the efficiency and accuracy of underground fluid detection are greatly improved.

Description

Technical Field

[0001] The present invention relates to the field of underground fluid detection, and in particular to an underground fluid detection device and a detection method integrating acoustic signals with laser induced breakdown spectroscopy technology. Background Art

[0002] Underground fluids refer to various liquid and gaseous substances present in the earth's crust. They mainly include groundwater, oil and natural gas, chemical solutions, geothermal fluids, etc. Among them, groundwater usually comes from precipitation and is stored in underground aquifers, while oil and natural gas are stored in rock pores. Chemical solutions refer to dissolved substances that may be contained in underground fluids, such as minerals, salts, etc., and geothermal fluids refer to hot water and steam, which are commonly found in geothermal resource areas. Underground fluid detection helps to determine the location and scale of oil and gas reservoirs, improve exploration efficiency, and can also assess the impact of climate change or human activities on groundwater. Therefore, with the increasing demand for resource development and environmental monitoring, the dynamic detection of underground fluid information has become increasingly important. Traditional underground fluid detection methods mostly rely on chemical analysis, which has problems such as poor real-time performance and insufficient sensitivity. An efficient and accurate detection system is urgently needed.

[0003] Underground fluid detection device and detection method integrating acoustic signal and laser induced breakdown spectroscopy technology Summary of the invention

[0004] The purpose of the present invention is to address the problems that traditional underground fluid detection methods mostly rely on chemical analysis and have poor real-time performance and insufficient sensitivity. To address these shortcomings, an underground fluid detection device and detection method that integrates acoustic signals and laser induced breakdown spectroscopy technology are proposed.

[0005] In order to achieve the above object, the present invention adopts the following technical solution: An underground fluid detection device integrating acoustic signal and laser induced breakdown spectroscopy technology comprises a conveying pipe and a drainage pipe, wherein one end of the conveying pipe is set as a water inlet and the other end is set as a water outlet, a notch is opened on the top of the conveying pipe, and one end of the drainage pipe is set as a water inlet, and further comprises a laser spectrum acquisition device, an acoustic signal acquisition device and a fusion signal analysis and correction module; the laser spectrum acquisition device is arranged above the conveying pipe, and the laser spectrum acquisition device comprises a solid laser, a beam expander, a reflector, a focusing lens and an optical fiber probe; the solid laser emits a laser beam through the beam expander, is reflected by the reflector, and is shot into the notch through the focusing lens, the acoustic signal acquisition device is arranged near one end of the water inlet of the drainage pipe, the acoustic signal acquisition device comprises a microphone, a filter and an oscilloscope, the microphone is arranged near one end of the water inlet of the drainage pipe, the microphone is connected to the filter, the filter is connected to the oscilloscope, and the collected acoustic signal is visualized by the oscilloscope; the fusion signal analysis and correction module is respectively connected to the laser spectrum acquisition device and the acoustic signal acquisition device; the fusion signal analysis and correction module comprises a processor, and the processor is connected to the oscilloscope.

[0006] As a further preferred embodiment of the present invention, the laser spectrum acquisition device also includes a laser control panel, a power supply, a battery switch, a switching button, a battery, a halogen lamp, a mercury-argon lamp, a CMOS camera, a delay trigger, a spectrometer, and a lifting platform; the optical fiber probe is connected to the spectrometer, the spectrometer is connected to the processor, the delay trigger is arranged between the spectrometer and the solid-state laser, and the power supply is switched to the power supply or the battery through the switching button on the battery switch; the halogen lamp and the mercury-argon lamp are arranged above the laser path, the wavelength of the laser spectrum is calibrated by the halogen lamp, and the intensity of the spectrum is calibrated by the mercury-argon lamp; the CMOS camera is arranged above the reflector and is located on a vertical plane with the reflected laser, the laser control panel is connected to the solid-state laser, and the lifting platform is arranged below the conveying pipeline to adjust the distance between the conveying pipeline and the lens.

[0007] As a further preferred embodiment of the present invention, the acoustic signal acquisition device also includes an amplifier, a volume adjustment knob and a sound card. The amplifier is arranged between the filter and the oscilloscope and is also connected to the sound card. The oscilloscope and the sound card are both provided with IO interfaces, and the volume adjustment knob is arranged on the amplifier.

[0008] As a further preferred embodiment of the present invention, the fusion signal analysis and correction module also includes a display, an environmental parameter display and an environmental parameter corrector; the environmental parameter display and the environmental parameter corrector are connected to the processor, and the environmental parameter corrector is provided with an environmental parameter adjustment knob.

[0009] The underground fluid detection method integrating acoustic signal and laser induced breakdown spectroscopy technology comprises the following steps: S1. Collect air spectrum by laser induced breakdown spectroscopy; S2, the air spectrum data collected by S1 is transmitted to the processor for processing, the current environmental parameter analysis results are visually displayed in the environmental parameter display, and the results are fed back to the environmental parameter corrector; S3, collecting underground fluid spectra by laser induced breakdown spectroscopy; S4. Acoustic signals of underground fluids are collected through acoustic detection technology, and the acoustic signals are filtered and enhanced; S5. The underground fluid spectral signal and acoustic signal are transmitted to the processor for processing, and the chemical composition information and physical properties of the underground fluid are obtained after correction by the environmental parameter corrector.

[0010] As a further preferred embodiment of the present invention, the chemical composition information includes element composition and content information of the fluid; and the physical properties include flow rate, flow velocity and density of the fluid.

[0011] The underground fluid detection device and detection method combining acoustic signal and laser induced breakdown spectroscopy technology proposed in the present invention have the following beneficial effects compared with the prior art: 1. The present invention integrates LIBS technology and acoustic detection technology to more comprehensively understand the characteristics of underground fluids, greatly improving the efficiency and accuracy of underground fluid detection; 2. The present invention uses LIBS technology to provide information on the elemental composition and content of underground fluids, which can be used to dynamically monitor changes in its composition; 3. The present invention uses acoustic detection technology to monitor the flow rate, flow velocity, density and other information of underground fluids; 4. The present invention uses laser induced breakdown spectroscopy technology to detect ambient air in advance, and can correct environmental factors such as temperature, humidity and pressure, thereby avoiding the influence of these environmental parameters on spectral signals and acoustic signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the structure of the laser spectrum acquisition device; Figure 3 It is a structural schematic diagram of an acoustic signal acquisition device; Figure 4 It is a structural diagram of the fusion signal analysis and correction module; Figure 5 It is a schematic diagram of the detection process of the present invention.

[0013] The meanings of the reference numerals in the figure are as follows: 1. solid-state laser; 2. laser control surface; 3. power supply; 4. battery switch; 5. switch button; 6. battery; 7. halogen lamp; 8. mercury-argon lamp; 9. beam expander; 10. reflector; 11. focusing lens; 12. CMOS camera; 13. water inlet; 14. water outlet; 15. delivery pipeline; 16. optical fiber probe; 17. delay trigger; 18. spectrometer; 19. lifting platform; 20. microphone; 21. filter; 22. amplifier; 23. volume adjustment knob; 24. oscilloscope; 25. sound card; 26. IO interface; 27. processor; 28. display; 29. ​​environmental parameter display; 30. environmental parameter corrector; 31. environmental parameter adjustment knob. DETAILED DESCRIPTION

[0014] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0015] Laser-induced breakdown spectroscopy (LIBS) is an atomic emission spectroscopy technique that uses high-energy pulsed lasers to vaporize underground fluid samples to generate plasma. The elemental composition and content of the sample can be identified by analyzing the spectral characteristics emitted. Compared with other common spectroscopy techniques, such as Fourier transform infrared spectroscopy, Raman spectroscopy, and ultraviolet visible spectroscopy, the main advantages of LIBS technology are that it can achieve real-time analysis and is suitable for dynamic detection scenarios; it does not require complex sample preparation processes and harsh working environments; compared with other molecular spectroscopy techniques, LIBS can directly detect elemental components, including trace elements, with high sensitivity.

[0016] Acoustic detection technology can use the sound wave propagation characteristics of underground fluids to monitor fluid flow changes. It has high monitoring sensitivity, can detect subtle fluid changes, and will not cause damage to the underground environment. It is suitable for dynamic detection scenarios.

[0017] Based on the high sensitivity of laser-induced breakdown spectroscopy technology to detect elemental composition and the rapid feedback of acoustic detection technology on the physical properties of samples, a novel and efficient fluid detection method is proposed by integrating two complementary technologies. The fused detection system can realize comprehensive real-time monitoring of underground fluid element composition and content, flow velocity, flow rate and density, and timely detect changes in fluid composition and characteristics, which is suitable for dynamic environments. Acoustic and spectral analysis results can also verify and correct each other to improve the accuracy and reliability of fluid detection. Environmental factors such as temperature, humidity and pressure may affect the propagation characteristics of sound waves, but laser-induced breakdown spectroscopy technology can be used to detect changes in environmental parameters, thereby correcting the results of acoustic detection technology and reducing fluid detection errors. The fusion of the two detection technologies can overcome the limitations of single technology detection and provide more comprehensive fluid property detection results. Moreover, this fusion can improve the efficiency and accuracy of underground fluid detection, thereby promoting its wide application in resource exploration and environmental protection.

[0018] Embodiment 1, combined with Figure 1-4 The underground fluid detection device integrating acoustic signal and laser induced breakdown spectroscopy technology includes a conveying pipe 15 and a drainage pipe. One end of the conveying pipe 15 is set as a water inlet 13, and the other end is set as a water outlet 14. A notch is opened on the top of the conveying pipe 15, and one end of the drainage pipe is set as a water inlet. It also includes a laser spectrum acquisition device, an acoustic signal acquisition device and a fusion signal analysis and correction module.

[0019] The laser spectrum acquisition device is arranged above the conveying pipeline 15, and the laser spectrum acquisition device includes a solid laser 1, a beam expander 9, a reflector 10, a focusing lens 11 and an optical fiber probe 16; the solid laser 1 emits a laser that passes through the beam expander 9, is reflected by the reflector 10, passes through the focusing lens 11 and enters the gap, and the laser is focused on the surface of the fluid to generate plasma; the beam expander 9 improves the focusing ability and optical quality of the laser beam; it also includes a laser control panel 2, a power supply 3, a battery switch 4, a switch button 5, a battery 6, a halogen lamp 7, a mercury argon lamp 8, a CMOS camera 12, a delay trigger 17, a spectrometer 18, and a lifting platform 19; the optical fiber probe 16 is connected to the spectrometer 18, and the spectrometer 18 is connected to the processor 27, and the spectrometer 18 can disperse the optical signal emitted by the plasma into signals with different wavelengths and different intensities, that is, spectral signals; the delay trigger 17 is arranged between the spectrometer 18 and the solid laser 1, and the delay trigger The function of the transmitter 17 is to set an appropriate delay time between the laser and the spectrometer 18 so as to obtain the best spectral signal; the switching button 5 on the battery switch 4 is used to switch the power supply 3 or the battery 6. The switching button 5 is normally switched to the power supply 3 direction. When the power supply 3 is insufficient, it can be switched to the battery 6 direction; the halogen lamp 7 and the mercury-argon lamp 8 are arranged above the laser path, and the wavelength of the laser spectrum is calibrated by the halogen lamp 7, and the intensity of the spectrum is calibrated by the mercury-argon lamp 8; the CMOS camera 12 is arranged above the reflector 10 and is located on the vertical plane with the reflected laser to ensure that the distance from the focusing lens 11 to the sample is constant and reduce the error of the spectral line intensity; the laser control surface 2 is connected to the solid laser 1, and the laser control surface 2 is used to adjust the laser pulse energy, repetition frequency and other parameters; the lifting platform 19 is arranged below the conveying pipeline 15 to adjust the distance between the conveying pipeline 15 and the lens.

[0020] The wavelength of the solid laser 1 used in the detection device is 1064nm, and its instrument parameters such as pulse energy and repetition frequency can be adjusted through the laser control panel 2. The default laser energy and repetition frequency are 130mJ and 10Hz respectively. Since the distance between the sample and the laser focus has a significant impact on the spectral results, it is necessary to set a CMOS camera 12 just above the reflector 10. During the measurement process, the distance between the sample surface and the lens is recorded in real time, and the distance is kept constant by adjusting the lifting platform 19 at the bottom of the conveying pipe 15. During the detection process of liquid samples, in order to avoid liquid splashing caused by excessive laser power density, the beam expander 9 is used to reduce the power density of the laser and improve the focusing ability and optical quality of the light beam. After that, the light beam is reflected by the reflector 10, passes through the focusing lens 11 and enters the gap. The laser is focused on the sample surface to generate plasma. Before conducting underground fluid detection, it is also necessary to consider the impact of environmental parameters such as temperature, humidity and pressure on the spectral results. Under different environmental parameters, the characteristic spectra of elements in the sample are different. Therefore, we adjust the lifting platform 19 so that the laser focus acts on the air. The current air spectrum detection results are compared with the calibrated database to analyze the specific temperature value, humidity value and pressure size. In order to obtain the spectral signal of the fluid sample, the optical fiber probe 16 is used to collect the light emitted by the plasma, which is connected to a spectrometer 18 with a collection range of 200-900nm and a resolution of 0.08nm. The spectrometer 18 can disperse the light signal emitted by the plasma into characteristic spectra with different wavelengths and different intensities. The wavelength represents different elements, and the intensity can characterize the concentration to a certain extent. The delay trigger 17 is set between the spectrometer 18 and the solid laser 1. The delay trigger 17 is used to set an appropriate delay time between the laser and the spectrometer 18, so as to avoid the strong bremsstrahlung radiation generated by the plasma in the early stage and obtain a spectral signal with the best signal-to-noise ratio.

[0021] The acoustic signal acquisition device is arranged near one end of the water inlet of the drainage pipe, and the acoustic signal acquisition device includes a microphone 20, a filter 21, an oscilloscope 24, an amplifier 22, a volume adjustment knob 23 and a sound card 25. The microphone 20 is arranged near one end of the water inlet of the drainage pipe, and is used to receive the acoustic signal of the fluid flow; the microphone 20 is connected to the filter 21; the filter 21 can filter noise and extract the required signal; the filter 21 is connected to the oscilloscope 24, and the collected acoustic signal is visualized through the oscilloscope 24; the amplifier 22 is arranged between the filter 21 and the oscilloscope 24, and can enhance the strength of the received acoustic signal; the amplifier 22 is also connected to the sound card 25, and the oscilloscope 24 and the sound card 25 are both provided with an IO interface 26, and the IO interface 26 is an external USB 2.0 compatible IO interface 26; the volume adjustment knob 23 is arranged on the amplifier 22, and can adjust the amplification factor of the acoustic signal strength; the sound card 25 connects the collected acoustic signal to a computer for further processing.

[0022] The fusion signal analysis and correction module is connected to the laser spectrum acquisition device and the acoustic signal acquisition device respectively; the fusion signal analysis and correction module mainly includes a high-performance computer, a computer display 28, an environmental parameter display 29 and an environmental parameter corrector 30. The computer is connected to the spectrometer 18 and can process and analyze the spectrum signal collected by the spectrometer 18; it is also connected to the oscilloscope 24 and the sound card 25, and can process and analyze the collected acoustic signals; in addition, the environmental parameter display 29 and the environmental parameter corrector 30 are connected to the processor 27, according to the optical The spectral signal generated by the excited air collected by the spectrometer 18 is compared and analyzed with the calibrated database. The computer can analyze the temperature, humidity and pressure of the current environment, and feed the results back to the environmental parameter display 29 for visual display; the environmental parameter corrector 30 inputs the correction signal into the computer according to the environmental parameters displayed in the environmental parameter display 29, corrects the intensity value of the spectral signal and the acoustic signal, and avoids errors caused by environmental factors; the environmental parameter corrector 30 is provided with an environmental parameter adjustment knob 31, which is used to adjust the temperature, humidity and pressure respectively.

[0023] Embodiment 2, combined with Figure 5 The underground fluid detection method integrating acoustic signal and laser induced breakdown spectroscopy technology comprises the following steps: S1. Collect air spectrum by laser induced breakdown spectroscopy; S2, the air spectrum data collected in S1 is transmitted to the processor 27 for processing, the current environmental parameter analysis result is visually displayed in the environmental parameter display 29, and the result is fed back to the environmental parameter corrector 30; S3, collecting underground fluid spectra by laser induced breakdown spectroscopy; S4. Acoustic signals of underground fluids are collected through acoustic detection technology, and the acoustic signals are filtered and enhanced; S5. The underground fluid spectral signal and acoustic signal are transmitted to the processor 27 for processing, and the chemical composition information and physical properties of the underground fluid are obtained after correction by the environmental parameter corrector 30. The chemical composition information includes the element composition and content information of the fluid; the physical properties include the flow rate, flow velocity and density of the fluid.

[0024] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present invention.

Claims

1. An underground fluid detection device integrating acoustic signals and laser induced breakdown spectroscopy technology, comprising a delivery pipe and a drainage pipe, wherein one end of the delivery pipe is set as a water inlet and the other end is set as a water outlet, a notch is opened on the top of the delivery pipe, and one end of the drainage pipe is set as a water inlet, characterized in that: It also includes a laser spectrum acquisition device, an acoustic signal acquisition device and a fusion signal analysis and correction module; the laser spectrum acquisition device is arranged above the conveying pipeline, and the laser spectrum acquisition device includes a solid laser, a beam expander, a reflector, a focusing lens and an optical fiber probe; the solid laser emits a laser that passes through the beam expander, is reflected by the reflector, and enters the gap through the focusing lens, the acoustic signal acquisition device is arranged near the water inlet end of the drainage pipe, the acoustic signal acquisition device includes a microphone, a filter and an oscilloscope, the microphone is arranged near the water inlet end of the drainage pipe, the microphone is connected to the filter, the filter is connected to the oscilloscope, and the collected acoustic signal is visualized through the oscilloscope; the fusion signal analysis and correction module is respectively connected to the laser spectrum acquisition device and the acoustic signal acquisition device; the fusion signal analysis and correction module includes a processor, and the processor is connected to the oscilloscope.

2. The underground fluid detection device integrating acoustic signal and laser induced breakdown spectroscopy technology according to claim 1 is characterized in that: The laser spectrum acquisition device also includes a laser control panel, a power supply, a battery switch, a switching button, a battery, a halogen lamp, a mercury-argon lamp, a CMOS camera, a delay trigger, a spectrometer, and a lifting platform; the optical fiber probe is connected to the spectrometer, the spectrometer is connected to the processor, the delay trigger is arranged between the spectrometer and the solid-state laser, and the power supply is switched to the power supply or the battery through the switching button on the battery switch; the halogen lamp and the mercury-argon lamp are arranged above the laser path, the wavelength of the laser spectrum is calibrated by the halogen lamp, and the intensity of the spectrum is calibrated by the mercury-argon lamp; the CMOS camera is arranged above the reflector and is located on a vertical plane with the reflected laser, the laser control panel is connected to the solid-state laser, and the lifting platform is arranged below the conveying pipeline to adjust the distance between the conveying pipeline and the lens.

3. The underground fluid detection device integrating acoustic signal and laser induced breakdown spectroscopy technology according to claim 1 is characterized in that: The acoustic signal acquisition device also includes an amplifier, a volume adjustment knob and a sound card. The amplifier is arranged between the filter and the oscilloscope and is also connected to the sound card. The oscilloscope and the sound card are both provided with IO interfaces. The volume adjustment knob is arranged on the amplifier.

4. The underground fluid detection device integrating acoustic signal and laser induced breakdown spectroscopy technology according to claim 1 is characterized in that: The fusion signal analysis and correction module also includes a display, an environmental parameter display and an environmental parameter corrector; the environmental parameter display and the environmental parameter corrector are connected to the processor, and the environmental parameter corrector is provided with an environmental parameter adjustment knob.

5. A method for detecting underground fluids by integrating acoustic signals with laser induced breakdown spectroscopy technology, characterized in that: The following steps are involved: S1. Collect air spectrum by laser induced breakdown spectroscopy; S2, the air spectrum data collected by S1 is transmitted to the processor for processing, the current environmental parameter analysis results are visually displayed in the environmental parameter display, and the results are fed back to the environmental parameter corrector; S3, collecting underground fluid spectra by laser induced breakdown spectroscopy; S4. Acoustic signals of underground fluids are collected through acoustic detection technology, and the acoustic signals are filtered and enhanced; S5. The underground fluid spectral signal and acoustic signal are transmitted to the processor for processing, and the chemical composition information and physical properties of the underground fluid are obtained after correction by the environmental parameter corrector.

6. The underground fluid detection method integrating acoustic signal and laser induced breakdown spectroscopy technology according to claim 5 is characterized in that: The chemical composition information includes the element composition and content information of the fluid; the physical properties include the flow rate, flow velocity and density of the fluid.

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