CN110987902A - Underwater LIBS spectrum-image combined detection device based on hyperbaric chamber - Google Patents
Underwater LIBS spectrum-image combined detection device based on hyperbaric chamber Download PDFInfo
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- CN110987902A CN110987902A CN201911190556.0A CN201911190556A CN110987902A CN 110987902 A CN110987902 A CN 110987902A CN 201911190556 A CN201911190556 A CN 201911190556A CN 110987902 A CN110987902 A CN 110987902A
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- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
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- G—PHYSICS
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The application discloses detection device is united to LIBS spectrum-image under water based on hyperbaric chamber includes: the device comprises a plasma excitation module, a spectrum acquisition module, an image acquisition module, a high-pressure cabin and a control system. The plasma excitation module is used for focusing a laser beam in a high-pressure chamber to generate plasma; the spectrum acquisition module is used for recording an underwater LIBS radiation spectrum signal; the image acquisition module is used for shooting two-dimensional images of underwater plasma, bubbles and shock waves; the hyperbaric chamber is used for providing an underwater high-pressure environment; the control system is used for controlling the operation of the plasma excitation module, the spectrum acquisition module and the image acquisition module. The high-pressure cabin can be adopted in a laboratory to simulate the deep sea high-pressure environment, and the external light path coupled with the high-pressure cabin is utilized to complete simultaneous acquisition of underwater LIBS spectrum and image information, thereby being beneficial to disclosing the LIBS detection mechanism in the deep sea high-pressure environment.
Description
Technical Field
The invention relates to an underwater LIBS spectrum-image combined detection device based on a high-pressure cabin.
Background
In recent years, the rapid development of ocean sensors and ocean carriers further promotes the development and utilization of the ocean, and simultaneously, higher requirements are provided for in-situ, real-time and online detection modes. The Laser Induced Breakdown Spectroscopy (LIBS) is a novel spectrum detection technology, has the characteristics of rapidness, no need of sample pretreatment, capability of carrying out simultaneous detection of multiple components and the like, and has a great application prospect in the aspect of deep sea in-situ detection. The technology is to take laser-induced plasma generated by breakdown in water as a radiation light source for spectrum detection, and the radiation characteristic of the plasma is closely related to the water pressure environment. The complex laws and mechanisms of pressure effects on underwater plasma due to ocean depth create difficulties for LIBS technology to be used for ocean exploration. In order to research the influence of the pressure effect in a laboratory, a LIBS spectrum-image combined detection device capable of simulating a deep-sea high-pressure environment needs to be designed urgently.
Disclosure of Invention
The embodiment of the application provides an underwater LIBS spectrum-image combined detection device based on a high-pressure cabin, so as to solve the problems. The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.
An underwater LIBS spectrum-image combined detection device based on a high-pressure cabin comprises: the device comprises a plasma excitation module, a spectrum acquisition module, an image acquisition module, a high-pressure cabin and a control system;
the plasma excitation module comprises a first laser, a half-wave plate, a Glan prism, a reflector, a beam expander and a first lens; after passing through a half-wave plate, a Glan prism, a reflector, a beam expander and a first lens, a laser beam emitted by a first laser is converged into a high-pressure chamber through a window of the high-pressure chamber and acts on a solution sample in the high-pressure chamber, and plasma is generated in the high-pressure chamber;
the spectrum acquisition module comprises a microscope objective, a broadband beam splitter prism, an optical fiber, a spectrometer and a first camera; the radiation light of the plasma in the hyperbaric chamber penetrates through the window, is reflected by the microscope objective and the broadband beam splitter prism and is coupled to the end part of the optical fiber, the other end of the optical fiber is connected with the spectrometer, and a first camera records LIBS (laser induced breakdown spectroscopy) spectrum signals of the plasma radiation;
the image acquisition module comprises a microscope objective, a broadband beam splitter prism, a filter, a second camera, a second laser, a second lens and a third lens; the image acquisition module comprises three imaging modes of direct imaging, spectral resolution imaging and schlieren imaging; the direct imaging mode is configured to shoot the overall radiation morphology and the spatial distribution of the plasma, the spectral resolution imaging mode is configured to shoot the characteristic radiation morphology and the spatial distribution of the plasma, and the schlieren imaging mode is configured to shoot bubble and shock wave images at the periphery of the plasma;
the hyperbaric chamber comprises a chamber body, a pressure sensor, a water inlet system and a drainage system, wherein the chamber body is of a cube structure, and four windows are arranged on the side surface of the chamber body; the pressure sensor is arranged in the cabin body and is electrically connected with an external control system; the water inlet system comprises a liquid storage tank, a pump body, a water inlet pipeline and a pressure retaining valve, wherein the pump body pumps the solution in the liquid storage tank into the cabin body through the water inlet pipeline, and the pressure retaining valve is arranged on the water inlet pipeline and used for retaining the pressure of the solution in the cabin body; the drainage system comprises an accommodating box, a drainage pipeline and a pressure relief valve, the accommodating box is communicated with the cabin body through the drainage pipeline, and the pressure relief valve is arranged on the drainage pipeline and used for relieving the pressure of the solution in the cabin body;
the control system comprises a digital delay generator and a PC (personal computer) end and controls the operation of the plasma excitation module, the spectrum acquisition module and the image acquisition module.
Optionally, the plasma excitation module further includes an energy monitoring device, the energy monitoring device includes a beam splitter, a photodetector and an oscilloscope, the beam splitter is disposed on a light path between the glan prism and the reflector, the laser emitted by the first laser is reflected to the photodetector by the beam splitter, and the photodetector is connected to the oscilloscope.
Optionally, in the image acquisition module, a microscope objective, a broadband beam splitter prism, a filter and a second camera are adopted in a direct imaging mode, the plasma in the high-voltage chamber is subjected to amplification imaging through the microscope objective, the appearance and two-dimensional spatial distribution of the total radiation of the plasma are shot by the second camera through the broadband beam splitter prism and the filter to the second camera, and the filter is a neutral density attenuation sheet.
Optionally, in the image acquisition module, a microscope objective, a broadband beam splitter prism, a filter and a second camera are adopted in a spectral resolution imaging mode, the plasma in the high-voltage cabin is magnified and imaged through the microscope objective, the appearance and two-dimensional spatial distribution of plasma characteristic radiation are shot by the second camera through the broadband beam splitter prism and the filter to the second camera, and the filter is a narrow-band optical filter corresponding to the central wavelength of the plasma characteristic radiation.
Optionally, in the image acquisition module, the schlieren formation of image mode adopts second laser instrument, second lens, third lens, microobjective, broadband beam splitter prism, filter plate and second camera, the second laser instrument transmission laser beam expands the beam through second lens and third lens, sees through hyperbaric chamber sapphire window, microobjective, broadband beam splitter prism and filter plate to second camera, shoots peripheral bubble of plasma and shock wave image by the second camera, the filter plate is the laser filter plate corresponding with second laser instrument central wavelength.
Optionally, the hyperbaric chamber further comprises a cleaning device, wherein the cleaning device comprises an air compressor, a water tank and a water supply pipeline, and the air compressor injects water in the water tank into the hyperbaric chamber through the water supply pipeline to clean the chamber body.
Optionally, in the control system, the digital delay generator is connected to the first laser, the second laser, the first camera and the second camera for timing control of spectrum and image acquisition, and the PC terminal is connected to the first camera and the second camera for storing spectrum and image data.
The invention has the beneficial effects that: the high-pressure cabin can be adopted in a laboratory to simulate the deep sea high-pressure environment, and the external light path coupled with the high-pressure cabin is utilized to complete simultaneous acquisition of underwater LIBS spectrum and image information, thereby being beneficial to disclosing the LIBS detection mechanism in the deep sea high-pressure environment.
Drawings
FIG. 1: the invention discloses a structural schematic diagram of an underwater LIBS spectrum-image combined detection device based on a high-pressure cabin;
FIG. 2: the structure of the high-pressure cabin of the invention is schematically shown.
Description of the drawings:
1. a first laser; 2. a half-wave plate; 3. a Glan prism; 4. a beam splitter; 5. a mirror; 6. a beam expander; 7. a photodetector; 8. an oscilloscope; 9. a first lens; 10. a digital delay generator; 11. a second laser; 12. a second lens; 13. a third lens; 14. a hyperbaric chamber; 14-1, a cabin body; 14-2, a window; 14-3, a pressure sensor; 14-4, a water inlet pipeline; 14-5, a pressure retaining valve; 14-6, pump body; 14-7, a liquid storage tank; 14-8, an accommodating box; 14-9, a pressure relief valve; 14-10 parts of a drainage pipeline; 15. a microscope objective; 16. a broadband beam splitter prism; 17. a filter plate; 18. a first camera; 19. a second camera; 20. an optical fiber; 21. a spectrometer; 22. and a PC terminal.
Detailed Description
So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.
The terms "first," "second," and the like, herein are used solely to distinguish one element from another without requiring or implying any actual such relationship or order between such elements. In practice, a first element can also be referred to as a second element, and vice versa. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a structure, apparatus, or device that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such structure, apparatus, or device. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a structure, device or apparatus that comprises the element. The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. As used herein, "plurality" or "a plurality" and the like may be understood as two or more, two or more.
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
as shown in fig. 1 and fig. 2, a high-pressure cabin-based underwater LIBS spectrum-image combined detection apparatus of the present embodiment includes: the device comprises a plasma excitation module, a spectrum acquisition module, an image acquisition module, a high-pressure cabin 14 and a control system;
the plasma excitation module comprises a first laser 1, a half-wave plate 2, a Glan prism 3, a reflector 5, a beam expander 6 and a first lens 9; after passing through a half-wave plate 2, a Glan prism 3, a reflector 5, a beam expander 6 and a first lens 9, a laser beam emitted by a first laser 1 is converged into a hyperbaric chamber 14 through a window 14-2 of the hyperbaric chamber 14 and acts on a solution sample in the hyperbaric chamber 14, and plasma is generated in the hyperbaric chamber 14;
the spectrum acquisition module comprises a microscope objective 15, a broadband beam splitter prism 16, an optical fiber 20, a spectrometer 21 and a first camera 18; the radiation rays of the plasma in the high-pressure cabin 14 penetrate through the window 14-2, are reflected by the microscope objective 15 and the broadband beam splitter prism 16 and are coupled to the end part of the optical fiber 20, the other end of the optical fiber 20 is connected with the spectrometer 21, and LIBS (laser-induced breakdown spectroscopy) spectrum signals of the plasma radiation are recorded by the first camera 18;
the image acquisition module comprises a microscope objective 15, a broadband beam splitter prism 16, a filter 17, a second camera 19, a second laser 11, a second lens 12 and a third lens 13; the image acquisition module comprises three imaging modes of direct imaging, spectral resolution imaging and schlieren imaging; the direct imaging mode is configured to shoot the overall radiation morphology and the spatial distribution of the plasma, the spectral resolution imaging mode is configured to shoot the characteristic radiation morphology and the spatial distribution of the plasma, and the schlieren imaging mode is configured to shoot bubble and shock wave images at the periphery of the plasma;
the hyperbaric chamber 14 comprises a chamber body 14-1, a pressure sensor 14-3, a water inlet system and a drainage system, wherein the chamber body 14-1 is of a cube structure, and four windows 14-2 are arranged on the side surface; the pressure sensor 14-3 is arranged in the cabin 14-1 and is electrically connected with an external control system; the water inlet system comprises a liquid storage tank 14-7, a pump body 14-6, a water inlet pipeline 14-4 and a pressure retaining valve 14-5, the pump body 14-6 pumps the solution in the liquid storage tank 14-7 into the cabin body 14-1 through the water inlet pipeline 14-4, and the pressure retaining valve 14-5 is arranged on the water inlet pipeline 14-4 and used for retaining the pressure of the solution in the cabin body 14-1; the drainage system comprises a containing tank 14-8, a drainage pipeline 14-10 and a pressure relief valve 14-9, the containing tank 14-8 is communicated with the cabin 14-1 through the drainage pipeline 14-10, and the pressure relief valve 14-9 is arranged on the drainage pipeline 14-10 and used for relieving the pressure of the solution in the cabin 14-1;
the control system comprises a digital delay generator 10 and a PC (personal computer) terminal 22, and controls the operation of the plasma excitation module, the spectrum acquisition module and the image acquisition module.
Optionally, the first lens 9 is a double cemented lens.
Alternatively, the cabin 14-1 of the hyperbaric cabin 14 is made of stainless steel material, the pressure adjustment range is 0.1-50MPa, and the pressure value can be read in real time through the pressure sensor 14-3 in the cabin 14-1.
Optionally, window 14-2 of ballast 14 is a sapphire window.
Optionally, the plasma excitation module further includes an energy monitoring device, the energy monitoring device includes a beam splitter 4, a photodetector 7 and an oscilloscope 8, the beam splitter 4 is disposed on an optical path between the glan prism 3 and the reflector 5, the laser emitted by the first laser 1 is reflected to the photodetector 7 by the beam splitter 4, and the photodetector 7 is connected to the oscilloscope 8.
Optionally, the first laser 1 is Nd: YAG pulse laser, output laser wavelength is 1064nm, and pulse width is 10 ns.
Optionally, in the image acquisition module, a microscope objective 15, a broadband beam splitter 16, a filter 17 and a second camera 19 are adopted in a direct imaging mode, the plasma in the hyperbaric chamber 14 is magnified and imaged through the microscope objective 15, the second camera 19 shoots the overall radiation morphology and two-dimensional spatial distribution of the plasma through the broadband beam splitter 16 and the filter 17 to the second camera 19, and the filter 17 is a neutral density attenuation sheet.
Optionally, in the image acquisition module, a spectral resolution imaging mode adopts a microscope objective 15, a broadband beam splitter prism 16, a filter 17 and a second camera 19, the plasma in the hyperbaric chamber 14 is magnified and imaged through the microscope objective 15, the appearance and two-dimensional spatial distribution of plasma characteristic radiation are shot by the second camera 19 through the broadband beam splitter prism 16 and the filter 17 to the second camera 19, and the filter 17 is a narrowband filter corresponding to the central wavelength of the plasma characteristic radiation.
Optionally, in the image acquisition module, a second laser 11, a second lens 12, a third lens 13, a microscope objective 15, a broadband beam splitter prism 16, a filter 17, and a second camera 19 are used for schlieren imaging, the second laser 11 emits a laser beam, the laser beam is expanded by the second lens 12 and the third lens 13, passes through a hyperbaric chamber 14 sapphire window 14-2, the microscope objective 15, the broadband beam splitter prism 16, the filter 17, and the second camera 19, and is used for shooting a peripheral bubble and shock wave image of plasma by the second camera 19, and the filter 17 is the laser filter 17 corresponding to the central wavelength of the second laser 11.
Optionally, the second laser 11 is Nd: YAG pulse laser with output laser wavelength of 532nm and pulse width of 10 ns.
Optionally, the second lens 12 and the third lens 13 are both plano-convex lenses.
Optionally, the hyperbaric chamber 14 further comprises a cleaning device (not shown) including an air compressor, a water tank and a water supply line, wherein the air compressor injects water in the water tank into the hyperbaric chamber 14 through the water supply line to clean the chamber 14-1.
Optionally, in the control system, the digital delay generator 10 is connected to the first laser 1, the second laser 11, the first camera 18 and the second camera 19 for timing control of spectrum and image acquisition, and the PC terminal 22 is connected to the first camera 18 and the second camera 19 for storing spectrum and image data.
Optionally, the first camera 18 and the second camera 19 are both enhanced CCD cameras.
The high-pressure cabin can be adopted in a laboratory to simulate the deep sea high-pressure environment, and the external light path coupled with the high-pressure cabin is utilized to complete simultaneous acquisition of underwater LIBS spectrum and image information, thereby being beneficial to disclosing the LIBS detection mechanism in the deep sea high-pressure environment.
The present invention has been described above by way of example, but the present invention is not limited to the above-described specific embodiments, and any modification or variation made based on the present invention is within the scope of the present invention as claimed.
Claims (7)
1. An underwater LIBS spectrum-image combined detection device based on a high-pressure cabin is characterized by comprising: the device comprises a plasma excitation module, a spectrum acquisition module, an image acquisition module, a high-pressure cabin and a control system;
the plasma excitation module comprises a first laser, a half-wave plate, a Glan prism, a reflector, a beam expander and a first lens; after passing through a half-wave plate, a Glan prism, a reflector, a beam expander and a first lens, a laser beam emitted by a first laser is converged into a high-pressure chamber through a window of the high-pressure chamber and acts on a solution sample in the high-pressure chamber, and plasma is generated in the high-pressure chamber;
the spectrum acquisition module comprises a microscope objective, a broadband beam splitter prism, an optical fiber, a spectrometer and a first camera; the radiation light of the plasma in the hyperbaric chamber penetrates through the window, is reflected by the microscope objective and the broadband beam splitter prism and is coupled to the end part of the optical fiber, the other end of the optical fiber is connected with the spectrometer, and a first camera records LIBS (laser induced breakdown spectroscopy) spectrum signals of the plasma radiation;
the image acquisition module comprises a microscope objective, a broadband beam splitter prism, a filter, a second camera, a second laser, a second lens and a third lens; the image acquisition module comprises three imaging modes of direct imaging, spectral resolution imaging and schlieren imaging; the direct imaging mode is configured to shoot the overall radiation morphology and the spatial distribution of the plasma, the spectral resolution imaging mode is configured to shoot the characteristic radiation morphology and the spatial distribution of the plasma, and the schlieren imaging mode is configured to shoot bubble and shock wave images at the periphery of the plasma;
the hyperbaric chamber comprises a chamber body, a pressure sensor, a water inlet system and a drainage system, wherein the chamber body is of a cube structure, and four windows are arranged on the side surface of the chamber body; the pressure sensor is arranged in the cabin body and is electrically connected with an external control system; the water inlet system comprises a liquid storage tank, a pump body, a water inlet pipeline and a pressure retaining valve, wherein the pump body pumps the solution in the liquid storage tank into the cabin body through the water inlet pipeline, and the pressure retaining valve is arranged on the water inlet pipeline and used for retaining the pressure of the solution in the cabin body; the drainage system comprises an accommodating box, a drainage pipeline and a pressure relief valve, the accommodating box is communicated with the cabin body through the drainage pipeline, and the pressure relief valve is arranged on the drainage pipeline and used for relieving the pressure of the solution in the cabin body;
the control system comprises a digital delay generator and a PC (personal computer) end and controls the operation of the plasma excitation module, the spectrum acquisition module and the image acquisition module.
2. The hyperbaric chamber-based underwater LIBS spectrum-image combined detection device of claim 1, wherein the plasma excitation module further comprises an energy monitoring device, the energy monitoring device comprises a spectroscope, a photodetector and an oscilloscope, the spectroscope is arranged on an optical path between the glan prism and the reflector, laser light emitted by the first laser is reflected to the photodetector by the spectroscope, and the photodetector is connected with the oscilloscope.
3. The underwater LIBS spectrum-image combined detection device based on the hyperbaric chamber as claimed in claim 1, wherein the image acquisition module adopts a microscope objective, a broadband beam splitter prism, a filter and a second camera in a direct imaging mode, the plasma in the hyperbaric chamber is magnified and imaged through the microscope objective, the second camera shoots the appearance and two-dimensional spatial distribution of the total radiation of the plasma through the broadband beam splitter prism and the filter, and the filter is a neutral density attenuator.
4. The underwater LIBS spectrum-image combined detection device based on the hyperbaric chamber as claimed in claim 1, wherein in the image acquisition module, a microscope objective, a broadband beam splitter prism, a filter and a second camera are adopted in a spectrum resolution imaging mode, the plasma in the hyperbaric chamber is magnified and imaged through the microscope objective, the appearance and two-dimensional spatial distribution of the plasma characteristic radiation are shot by the second camera through the broadband beam splitter prism and the filter to the second camera, and the filter is a narrow-band filter corresponding to the central wavelength of the plasma characteristic radiation.
5. The underwater LIBS spectrum-image combined detection device based on the hyperbaric chamber as claimed in claim 1, wherein in the image acquisition module, a second laser, a second lens, a third lens, a microscope objective, a broadband beam splitter prism, a filter and a second camera are adopted for schlieren imaging, the second laser emits a laser beam, the laser beam is expanded by the second lens and the third lens, the laser beam passes through the sapphire window of the hyperbaric chamber, the microscope objective, the broadband beam splitter prism and the filter to the second camera, and a bubble and shock wave image at the periphery of the plasma is shot by the second camera, and the filter is a laser filter corresponding to the central wavelength of the second laser.
6. The hyperbaric chamber-based underwater LIBS spectrum-image combined detection device according to claim 1, wherein the hyperbaric chamber further comprises a cleaning device, the cleaning device comprises an air compressor, a water tank and a water supply pipeline, and the air compressor injects water in the water tank into the hyperbaric chamber through the water supply pipeline to clean the chamber body.
7. The underwater LIBS spectrum-image combined detection device based on the hyperbaric chamber as claimed in claim 1, wherein in the control system, the digital time delay generator is connected with the first laser, the second laser, the first camera and the second camera for the time sequence control of spectrum and image acquisition, and the PC terminal is connected with the first camera and the second camera for storing spectrum and image data.
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| CN111610180A (en) * | 2020-07-15 | 2020-09-01 | 中国海洋大学 | Time-resolved image acquisition system and apparatus for plasma |
| CN111965169A (en) * | 2020-08-27 | 2020-11-20 | 中国海洋大学 | Deep sea high-pressure simulation control system, method and device for underwater LIBS detection |
| CN113008862A (en) * | 2021-02-03 | 2021-06-22 | 中国海洋大学 | Underwater Raman probe and underwater detection system |
| CN113970549A (en) * | 2021-10-11 | 2022-01-25 | 中国科学院力学研究所 | Test device for simulating deep sea underwater explosion |
| WO2023137847A1 (en) * | 2022-01-24 | 2023-07-27 | 中国科学院沈阳自动化研究所 | Underwater element online detection apparatus and method based on libs technology |
| CN117173342A (en) * | 2023-11-02 | 2023-12-05 | 中国海洋大学 | Underwater monocular and binocular camera-based natural light moving three-dimensional reconstruction device and method |
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