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

Abstract

The utility model 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 utility model relates to underground fluid detection field, concretely relates to the underground fluid detection device of fusion acoustic signal and laser induced breakdown spectroscopy technology. BACKGROUND

[0002] Underground fluid refers to various liquid and gaseous substances existing in the earth's crust. They mainly include groundwater, oil and natural gas, chemical solution, geothermal fluid, etc. Among them, groundwater usually comes from precipitation and is stored in underground aquifers, oil and natural gas are stored in rock pores, chemical solution refers to the dissolved substances that may be contained in underground fluid, such as minerals, salts, etc., and geothermal fluid refers to hot water and steam, 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 also can evaluate the impact of climate change or human activities on groundwater. Therefore, with the increasing demand for resource development and environmental monitoring, dynamic detection of underground fluid information becomes more and more important. Traditional underground fluid detection methods rely mainly on chemical analysis, which has the problems of poor real-time performance, insufficient sensitivity, etc. Therefore, there is an urgent need for an efficient and accurate detection system. SUMMARY

[0003] The utility model aims at the traditional underground fluid detection method that relies mainly on chemical analysis, has the problems of poor real-time performance, insufficient sensitivity, etc., and in view of this shortage, the underground fluid detection device of fusion acoustic signal and laser induced breakdown spectroscopy technology is provided.

[0004] In order to realize the above target, the utility model adopts the following technical scheme:

[0005] The utility model provides a detection device of underground fluid fuses acoustic signal and laser induced breakdown spectroscopy technology, including conveying pipeline and drain pipeline, one end of conveying pipeline is arranged as the water inlet, the other end is arranged as the water outlet, the top of conveying pipeline is opened and has the gap, one end of drain pipeline is arranged as the water inlet, still include laser spectrum collection device, acoustic signal collection device and fusion signal analysis and correction module, laser spectrum collection device sets up in conveying pipeline top, laser spectrum collection device includes solid laser, beam expander, reflector, focusing lens and optical fiber probe, solid laser sends out laser through beam expander, carries out the reflection through reflector, passes through focusing lens and shoots into the gap, acoustic signal collection device is close to the water inlet one end of drain pipeline and sets up, acoustic signal collection device includes microphone, filter and oscillograph, the microphone is close to the water inlet one end of drain pipeline and sets up, the microphone is connected with filter, and filter is connected with oscillograph, and the sound signal of collection can be visualized through oscillograph, fusion signal analysis and correction module are connected with laser spectrum collection device, acoustic signal collection device respectively, fusion signal analysis and correction module includes treater, and the treater is connected with oscillograph.

[0006] As a further preferred embodiment of the utility model, the laser spectrum collection device further comprises a laser control panel, a power supply, a battery switch, a switching button, a storage battery, a halogen lamp, a mercury argon lamp, a CMOS camera, a delay flip-flop, a spectrometer, and a lifting platform. The optical fiber probe is connected to the spectrometer, and the spectrometer is connected to the processor. The delay flip-flop is arranged between the spectrometer and the solid laser. The switching button on the battery switch is used to switch between the power supply and the storage battery. The halogen lamp and the mercury argon lamp are arranged above the laser path. The halogen lamp is used for wavelength calibration of the laser spectrum, and the mercury argon lamp is used for intensity calibration of the spectrum. The CMOS camera is arranged above the reflector and is located on the vertical plane with the reflected laser. The laser control panel is connected to the solid laser. The lifting platform is arranged below the conveying pipeline and is used to adjust the distance between the conveying pipeline and the lens.

[0007] As a further preferred embodiment of the utility model, the acoustic signal collection device further comprises an amplifier, a volume adjustment knob, and a sound card. The amplifier is arranged between the filter and the oscillograph and is connected to the sound card. IO interfaces are arranged on the oscillograph and the sound card. The volume adjustment knob is arranged on the amplifier.

[0008] As a further preferred embodiment of the utility model, the fusion signal analysis and correction module further comprises 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. An environmental parameter adjustment knob is arranged on the environmental parameter corrector.

[0009] Compared with the prior art, the underground fluid detection device fusing acoustic signals and laser-induced breakdown spectroscopy technology has the following beneficial effects:

[0010] 1、 the utility model discloses a LIBS technology and acoustic detection technology are fused, can more comprehensive understanding underground fluid characteristics, greatly improve the efficiency and accuracy of underground fluid detection,

[0011] 2、 the utility model discloses the element composition and content information of underground fluid can be provided using LIBS technology, can be used for dynamic monitoring its component change,

[0012] 3、 the utility model discloses acoustic detection technology can monitor the flow, flow rate and density of underground fluid and other information,

[0013] 4、 the utility model discloses the laser-induced breakdown spectroscopy technology is used to the detection of ambient air in advance, can correct temperature, humidity and pressure and other environmental factors, thereby avoiding the influence of these environmental parameters on spectral signal and acoustic signal. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the overall structure schematic view of the utility model,

[0015] Figure 2 It is the structure schematic view of laser spectrum acquisition device,

[0016] Figure 3 It is the structure schematic view of acoustic signal acquisition device,

[0017] Figure 4 It is the structure schematic view of fusion signal analysis and correction module,

[0018] Figure 5 It is the detection process schematic view of the utility model.

[0019] The meaning of reference signs in the drawing: 1, solid laser, 2, laser control surface, 3, power supply, 4, battery switcher, 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, conveying 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

[0020] The utility model will be specifically introduced below in combination with the drawings and specific embodiments.

[0021] Laser-induced breakdown spectroscopy (LIBS) is a kind of atomic emission spectroscopy technology, which vaporizes underground fluid samples by high-energy pulsed laser to generate plasma, and analyzes the spectral characteristics emitted thereby to identify the elemental composition and content of the sample. Compared with other common spectroscopy technologies, such as Fourier transform infrared spectroscopy, Raman spectroscopy and ultraviolet-visible spectroscopy, the main advantages of LIBS technology are that it can realize real-time analysis and is suitable for dynamic detection scenarios, does not require complex sample preparation process and harsh working environment, and can directly detect elemental components, including trace elements, with high sensitivity.

[0022] Acoustic detection technology can monitor the flow changes of underground fluids by utilizing the acoustic wave propagation characteristics of the fluids, has high monitoring sensitivity, can detect subtle fluid changes, and will not cause damage to the underground environment, and is suitable for dynamic detection scenarios.

[0023] Based on the high-sensitivity detection of elemental components by laser-induced breakdown spectroscopy and the rapid feedback of sample physical properties by acoustic detection technology, a novel and efficient fluid detection method is proposed by integrating the two complementary technologies. The integrated detection system can realize comprehensive real-time monitoring of the elemental composition and content, flow rate, flow volume and density of underground fluids, and can timely detect changes in the composition and characteristics of the fluids, and is suitable for dynamic environments. The acoustic and spectroscopic analysis results can also be verified and corrected with each other, improving the accuracy and reliability of fluid detection. Environmental factors such as temperature, humidity and pressure may affect the propagation characteristics of acoustic waves, but laser-induced breakdown spectroscopy can be used to detect changes in environmental parameters to correct the results of acoustic detection technology and reduce fluid detection errors. The integration of the two detection technologies can overcome the limitations of single technology detection, provide more comprehensive fluid property detection results, and improve the efficiency and accuracy of underground fluid detection, thereby promoting wide application in resource exploration and environmental protection fields.

[0024] Embodiment one, in combination Figures 1-4 , the underground fluid detection device integrating acoustic signals and laser-induced breakdown spectroscopy technology includes a conveying pipeline 15 and a drainage pipeline, one end of the conveying pipeline 15 is provided as a water inlet 13, the other end is provided as a water outlet 14, a notch is formed in the top of the conveying pipeline 15, one end of the drainage pipeline is provided as a water inlet, and the device further includes a laser spectrum acquisition device, an acoustic signal acquisition device and a fusion signal analysis and correction module.

[0025] The laser spectrum acquisition device is arranged above the conveying pipeline 15, and comprises a solid laser 1, a beam expander 9, a mirror 10, a focusing lens 11 and a fiber probe 16; the solid laser 1 emits laser light which passes through the beam expander 9, is reflected by the mirror 10, passes through the focusing lens 11 and is incident into a gap, and the laser light 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; further comprising a laser control panel 2, a power supply 3, a battery switch 4, a switching button 5, a storage 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 fiber probe 16 is connected with the spectrometer 18, the spectrometer 18 is connected with a processor 27, and the spectrometer 18 can disperse the light signals emitted by the plasma into signals with different wavelengths and different intensities, i.e. spectrum signals; the delay trigger 17 is arranged between the spectrometer 18 and the solid laser 1, and the delay trigger 17 functions to set a proper delay time between the laser and the spectrometer 18, so as to obtain the best spectrum signals; the switching button 5 on the battery switch 4 is used to switch the power supply from the power supply 3 to the storage battery 6, and the switching button 5 is normally switched to the power supply 3, and when the power supply 3 is insufficient, the switching button 5 can be switched to the storage battery 6; the halogen lamp 7 and the mercury argon lamp 8 are arranged above the laser path, the halogen lamp 7 is used for wavelength calibration of the laser spectrum, and the mercury argon lamp 8 is used for intensity calibration of the spectrum; the CMOS camera 12 is arranged above the mirror 10 and is located on the vertical plane with the reflected laser, so as to ensure that the distance from the focusing lens 11 to the sample is constant and the error of the spectrum line intensity is reduced; the laser control panel 2 is connected with the solid laser 1, and is used to adjust the pulse energy and the repetition frequency of the laser; and the lifting platform 19 is arranged below the conveying pipeline 15, and is used to adjust the distance between the conveying pipeline 15 and the lens.

[0026] The wavelength of the solid-state laser 1 used in the detection device is 1064 nm, and the pulse energy and repetition rate of the instrument parameters can be adjusted by the laser control panel 2. The default laser energy and repetition rate are 130 mJ and 10 Hz, respectively. Since the distance between the sample and the laser focus has a significant impact on the spectral results, a CMOS camera 12 is placed directly above the mirror 10 to record the distance between the sample surface and the lens in real time during the measurement process. The distance is kept constant by adjusting the lifting platform 19 at the bottom of the delivery pipeline 15. During the detection of liquid samples, in order to avoid liquid splashing caused by excessive laser power density, a beam expander 9 is used to reduce the power density of the laser and improve the focusing ability and optical quality of the beam. After the beam is reflected by the mirror 10, it passes through the focusing lens 11 and enters the gap, and the laser is focused on the sample surface to generate plasma. Before detecting underground fluids, environmental parameters such as temperature, humidity, and pressure need to be considered, as the characteristic spectra of elements in the sample will vary under different environmental parameters. Therefore, we adjust the lifting platform 19 so that the laser focus acts on the air. By comparing the current air spectrum detection results with the calibrated database, we can analyze the specific temperature value, humidity value, and pressure size. In order to obtain the spectral signal of the fluid sample, a 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 200-900 nm and a resolution of 0.08 nm. The spectrometer 18 can disperse the light signal emitted by the plasma into characteristic spectral lines with different wavelengths and intensities. The wavelength represents different elements, and the intensity can represent the concentration to some extent. The delay trigger 17 is set between the spectrometer 18 and the solid-state laser 1. The delay trigger 17 sets the appropriate delay time between the laser and the spectrometer 18, thereby avoiding the strong bremsstrahlung radiation in the initial stage of plasma generation and obtaining spectral signals with the best signal-to-noise ratio.

[0027] The acoustic signal acquisition device is positioned near the inlet of the drainage pipe. The device includes a microphone 20, a filter 21, an oscilloscope 24, an amplifier 22, a volume control knob 23, and a sound card 25. The microphone 20, positioned near the inlet of the drainage pipe, receives acoustic signals from the fluid flow. The microphone 20 is connected to the filter 21, which filters noise and extracts the desired signal. The filter 21 is connected to the oscilloscope 24, which visualizes the acquired acoustic signal. The amplifier 22 is positioned between the filter 21 and the oscilloscope 24 to enhance the intensity of the received acoustic signal. The amplifier 22 is also connected to the sound card 25. Both the oscilloscope 24 and the sound card 25 have I / O interfaces 26, which are external USB 2.0 compatible. The volume control knob 23 is located on the amplifier 22 and adjusts the amplification factor of the acoustic signal intensity. The sound card 25 connects the acquired acoustic signal to a computer for further processing.

[0028] 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 monitor 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 spectral signals acquired by the spectrometer 18; it is also connected to an oscilloscope 24 and a sound card 25 to process and analyze the acquired acoustic signals. Furthermore, the environmental parameter display 29 and the environmental parameter corrector 30 are connected to the processor 27, and based on the spectrum... The spectral signal generated by the excitation air collected by instrument 18 is compared and analyzed with the calibrated database. The computer can analyze the current ambient temperature, humidity and pressure, and feed the results back to the environmental parameter display 29 for visualization. The environmental parameter corrector 30 inputs a correction signal into the computer based on the environmental parameters displayed in the environmental parameter display 29 to correct the intensity values ​​of the spectral signal and acoustic signal, avoiding errors caused by environmental factors. The environmental parameter corrector 30 is equipped with an environmental parameter adjustment knob 31, which is used to adjust the temperature, humidity and pressure respectively.

[0029] Example 2, combined with Figure 5 A method for detecting underground fluids that integrates acoustic signals and laser-induced breakdown spectroscopy includes the following steps:

[0030] S1. Air spectrum acquisition using laser-induced breakdown spectroscopy;

[0031] S2, the air spectrum data collected by S1 is transmitted to the processor 27 for processing, the current environmental parameter analysis result is visualized in the environmental parameter display 29, and the result is fed back to the environmental parameter corrector 30;

[0032] S3, the underground fluid spectrum is collected by the laser-induced breakdown spectroscopy technology;

[0033] S4, the underground fluid acoustic signal is collected by the acoustic detection technology, and the acoustic signal is filtered and enhanced;

[0034] S5, the underground fluid spectrum signal and the acoustic signal are transmitted to the processor 27 for processing, and the chemical composition information and the physical characteristics of the underground fluid are obtained after being corrected by the environmental parameter corrector 30. The chemical composition information includes the element composition and content information of the fluid; the physical characteristics include the flow, flow rate and density of the fluid.

[0035] The basic principle, main features and advantages of the utility model are shown and described above. The skilled in the art should understand that the above examples do not limit the utility model in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the utility model.

Claims

1. A device for detecting underground fluid by fusing acoustic signals and laser-induced breakdown spectroscopy technology, comprising a conveying pipeline and a drainage pipeline, one end of the conveying pipeline is provided as a water inlet, the other end is provided as a water outlet, a notch is formed at the top of the conveying pipeline, one end of the drainage pipeline is provided as a water inlet, characterized in that, The laser spectrum acquisition device is arranged above the conveying pipeline, and comprises a solid laser, a beam expander, a reflecting mirror, a focusing lens and a fiber probe; the solid laser emits laser light which passes through the beam expander, is reflected by the reflecting mirror, passes through the focusing lens and is shot into the gap; the acoustic signal acquisition device is arranged close to the water inlet end of the drainage pipeline, and comprises a microphone, a filter and an oscilloscope; the microphone is arranged close to the water inlet end of the drainage pipeline, and is connected with the filter; the filter is connected with the oscilloscope; the acoustic signal collected by the oscilloscope can be visualized; the fusion signal analysis and correction module is connected with the laser spectrum acquisition device and the acoustic signal acquisition device respectively; and the fusion signal analysis and correction module comprises a processor which is connected with the oscilloscope.

2. The apparatus for detecting a subsurface fluid by fusing acoustic signals with laser-induced breakdown spectroscopy technology according to claim 1, wherein, The laser spectrum acquisition device further comprises a laser control panel, a power supply, a battery switch, a switching button, a storage battery, a halogen lamp, a mercury argon lamp, a CMOS camera, a delay flip-flop, a spectrometer and a lifting platform; the fiber probe is connected with the spectrometer; the spectrometer is connected with the processor; the delay flip-flop is arranged between the spectrometer and the solid laser; the switching button on the battery switch is used to switch the power supply between the power supply and the storage battery; the halogen lamp and the mercury argon lamp are arranged above the laser path; the halogen lamp is used for wavelength calibration of the laser spectrum; and the mercury argon lamp is used for intensity calibration of the spectrum; the CMOS camera is arranged above the reflecting mirror and is located on the vertical plane with the reflected laser light; the laser control panel is connected with the solid laser; and the lifting platform is arranged below the conveying pipeline and is used for adjusting the distance between the conveying pipeline and the lens.

3. The apparatus for detecting subsurface fluid by fusing acoustic signals with laser-induced breakdown spectroscopy technology of claim 1, wherein, The acoustic signal acquisition device further comprises an amplifier, a volume adjusting knob and a sound card; the amplifier is arranged between the filter and the oscilloscope and is connected with the sound card; IO interfaces are arranged on the oscilloscope and the sound card; and the volume adjusting knob is arranged on the amplifier.

4. The apparatus for detecting subsurface fluids by fusion of acoustic signals with laser-induced breakdown spectroscopy technique as claimed in claim 1, wherein, The fusion signal analysis and correction module further comprises a display, an environmental parameter display and an environmental parameter corrector; the environmental parameter display and the environmental parameter corrector are connected with the processor; and an environmental parameter adjusting knob is arranged on the environmental parameter corrector.

Images